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nfqws: QUIC initial dissection support
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bol-van
parent
f10d17469e
commit
dce5b4c6f0
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@ -422,7 +422,7 @@ UDP attacks are limited. Its not possible to fragment UDP on transport level, on
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Only desync modes `fake`,`hopbyhop`,`destopt`,`ipfrag1` and `ipfrag2` are applicable.
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`fake`,`hopbyhop`,`destopt` can be used in combo with `ipfrag2`.
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QUIC initial packets are recognized. Decryption and hostname extraction is not supported so `--hostlist` parameter will not work.
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QUIC initial packets are recognized. Decryption and hostname extraction is supported so `--hostlist` parameter will work.
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For other protocols desync use `--dpi-desync-any-protocol`.
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Conntrack supports udp. `--dpi-desync-cutoff` will work. UDP conntrack timeout can be set in the 4th parameter of `--ctrack-timeouts`.
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@ -455,8 +455,8 @@ window size итоговый размер окна стал максимальн
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Атаки на udp более ограничены в возможностях. udp нельзя фрагментировать иначе, чем на уровне ip.
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Для UDP действуют только режимы десинхронизации fake,hopbyhop,destopt,ipfrag1,ipfrag2.
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Возможно сочетание fake,hopbyhop,destopt с ipfrag2.
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Поддерживается определение пакетов QUIC Initial без расшифровки содержимого и имени хоста, то есть параметр
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--hostlist не будет работать. Для десинхронизации других протоколов обязательно указывать --dpi-desync-any-protocol.
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Поддерживается определение пакетов QUIC Initial с расшифровкой содержимого и имени хоста, то есть параметр
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--hostlist будет работать. Для десинхронизации других протоколов обязательно указывать --dpi-desync-any-protocol.
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Реализован conntrack для udp. Можно пользоваться --dpi-desync-cutoff. Таймаут conntrack для udp
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можно изменить 4-м параметром в --ctrack-timeouts.
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Атака fake полезна только для stateful DPI, она бесполезна для анализа на уровне отдельных пакетов.
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@ -1,7 +1,7 @@
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CC ?= cc
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CFLAGS += -std=gnu99 -s -O3 -Wno-address-of-packed-member -Wno-logical-op-parentheses -Wno-switch
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LIBS = -lz
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SRC_FILES = *.c
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SRC_FILES = *.c crypto/*.c
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all: dvtws
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@ -4,7 +4,7 @@ CFLAGS_BSD = -Wno-address-of-packed-member -Wno-switch
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CFLAGS_MAC = -mmacosx-version-min=10.8
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LIBS = -lnetfilter_queue -lnfnetlink -lz
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LIBS_BSD = -lz
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SRC_FILES = *.c
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SRC_FILES = *.c crypto/*.c
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all: nfqws
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38
nfq/crypto/aes-gcm.c
Normal file
38
nfq/crypto/aes-gcm.c
Normal file
@ -0,0 +1,38 @@
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#include "aes-gcm.h"
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int aes_gcm_encrypt(unsigned char* output, const unsigned char* input, size_t input_length, const unsigned char* key, const size_t key_len, const unsigned char * iv, const size_t iv_len) {
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int ret = 0; // our return value
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gcm_context ctx; // includes the AES context structure
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size_t tag_len = 0;
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unsigned char * tag_buf = NULL;
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gcm_setkey(&ctx, key, (const uint)key_len);
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ret = gcm_crypt_and_tag(&ctx, ENCRYPT, iv, iv_len, NULL, 0,
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input, output, input_length, tag_buf, tag_len);
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gcm_zero_ctx(&ctx);
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return(ret);
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}
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int aes_gcm_decrypt(unsigned char* output, const unsigned char* input, size_t input_length, const unsigned char* key, const size_t key_len, const unsigned char * iv, const size_t iv_len) {
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int ret = 0; // our return value
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gcm_context ctx; // includes the AES context structure
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size_t tag_len = 0;
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unsigned char * tag_buf = NULL;
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gcm_setkey(&ctx, key, (const uint)key_len);
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ret = gcm_crypt_and_tag(&ctx, DECRYPT, iv, iv_len, NULL, 0,
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input, output, input_length, tag_buf, tag_len);
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gcm_zero_ctx(&ctx);
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return(ret);
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}
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6
nfq/crypto/aes-gcm.h
Normal file
6
nfq/crypto/aes-gcm.h
Normal file
@ -0,0 +1,6 @@
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#pragma once
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#include "gcm.h"
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int aes_gcm_encrypt(unsigned char* output, const unsigned char* input, size_t input_length, const unsigned char* key, const size_t key_len, const unsigned char * iv, const size_t iv_len);
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int aes_gcm_decrypt(unsigned char* output, const unsigned char* input, size_t input_length, const unsigned char* key, const size_t key_len, const unsigned char * iv, const size_t iv_len);
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483
nfq/crypto/aes.c
Normal file
483
nfq/crypto/aes.c
Normal file
@ -0,0 +1,483 @@
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/******************************************************************************
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*
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* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
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*
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* This is a simple and straightforward implementation of the AES Rijndael
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* 128-bit block cipher designed by Vincent Rijmen and Joan Daemen. The focus
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* of this work was correctness & accuracy. It is written in 'C' without any
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* particular focus upon optimization or speed. It should be endian (memory
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* byte order) neutral since the few places that care are handled explicitly.
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*
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* This implementation of Rijndael was created by Steven M. Gibson of GRC.com.
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*
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* It is intended for general purpose use, but was written in support of GRC's
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* reference implementation of the SQRL (Secure Quick Reliable Login) client.
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*
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* See: http://csrc.nist.gov/archive/aes/rijndael/wsdindex.html
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*
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* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
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* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
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*
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*******************************************************************************/
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#include "aes.h"
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static int aes_tables_inited = 0; // run-once flag for performing key
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// expasion table generation (see below)
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/*
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* The following static local tables must be filled-in before the first use of
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* the GCM or AES ciphers. They are used for the AES key expansion/scheduling
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* and once built are read-only and thread safe. The "gcm_initialize" function
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* must be called once during system initialization to populate these arrays
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* for subsequent use by the AES key scheduler. If they have not been built
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* before attempted use, an error will be returned to the caller.
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*
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* NOTE: GCM Encryption/Decryption does NOT REQUIRE AES decryption. Since
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* GCM uses AES in counter-mode, where the AES cipher output is XORed with
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* the GCM input, we ONLY NEED AES encryption. Thus, to save space AES
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* decryption is typically disabled by setting AES_DECRYPTION to 0 in aes.h.
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*/
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// We always need our forward tables
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static uchar FSb[256]; // Forward substitution box (FSb)
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static uint32_t FT0[256]; // Forward key schedule assembly tables
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static uint32_t FT1[256];
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static uint32_t FT2[256];
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static uint32_t FT3[256];
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#if AES_DECRYPTION // We ONLY need reverse for decryption
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static uchar RSb[256]; // Reverse substitution box (RSb)
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static uint32_t RT0[256]; // Reverse key schedule assembly tables
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static uint32_t RT1[256];
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static uint32_t RT2[256];
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static uint32_t RT3[256];
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#endif /* AES_DECRYPTION */
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static uint32_t RCON[10]; // AES round constants
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/*
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* Platform Endianness Neutralizing Load and Store Macro definitions
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* AES wants platform-neutral Little Endian (LE) byte ordering
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*/
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#define GET_UINT32_LE(n,b,i) { \
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(n) = ( (uint32_t) (b)[(i) ] ) \
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| ( (uint32_t) (b)[(i) + 1] << 8 ) \
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| ( (uint32_t) (b)[(i) + 2] << 16 ) \
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| ( (uint32_t) (b)[(i) + 3] << 24 ); }
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#define PUT_UINT32_LE(n,b,i) { \
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(b)[(i) ] = (uchar) ( (n) ); \
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(b)[(i) + 1] = (uchar) ( (n) >> 8 ); \
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(b)[(i) + 2] = (uchar) ( (n) >> 16 ); \
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(b)[(i) + 3] = (uchar) ( (n) >> 24 ); }
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/*
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* AES forward and reverse encryption round processing macros
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*/
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#define AES_FROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \
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{ \
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X0 = *RK++ ^ FT0[ ( Y0 ) & 0xFF ] ^ \
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FT1[ ( Y1 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y2 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y3 >> 24 ) & 0xFF ]; \
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\
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X1 = *RK++ ^ FT0[ ( Y1 ) & 0xFF ] ^ \
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FT1[ ( Y2 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y3 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y0 >> 24 ) & 0xFF ]; \
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\
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X2 = *RK++ ^ FT0[ ( Y2 ) & 0xFF ] ^ \
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FT1[ ( Y3 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y0 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y1 >> 24 ) & 0xFF ]; \
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\
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X3 = *RK++ ^ FT0[ ( Y3 ) & 0xFF ] ^ \
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FT1[ ( Y0 >> 8 ) & 0xFF ] ^ \
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FT2[ ( Y1 >> 16 ) & 0xFF ] ^ \
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FT3[ ( Y2 >> 24 ) & 0xFF ]; \
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}
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#define AES_RROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \
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{ \
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X0 = *RK++ ^ RT0[ ( Y0 ) & 0xFF ] ^ \
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RT1[ ( Y3 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y2 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y1 >> 24 ) & 0xFF ]; \
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\
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X1 = *RK++ ^ RT0[ ( Y1 ) & 0xFF ] ^ \
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RT1[ ( Y0 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y3 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y2 >> 24 ) & 0xFF ]; \
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\
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X2 = *RK++ ^ RT0[ ( Y2 ) & 0xFF ] ^ \
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RT1[ ( Y1 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y0 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y3 >> 24 ) & 0xFF ]; \
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\
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X3 = *RK++ ^ RT0[ ( Y3 ) & 0xFF ] ^ \
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RT1[ ( Y2 >> 8 ) & 0xFF ] ^ \
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RT2[ ( Y1 >> 16 ) & 0xFF ] ^ \
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RT3[ ( Y0 >> 24 ) & 0xFF ]; \
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}
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/*
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* These macros improve the readability of the key
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* generation initialization code by collapsing
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* repetitive common operations into logical pieces.
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*/
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#define ROTL8(x) ( ( x << 8 ) & 0xFFFFFFFF ) | ( x >> 24 )
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#define XTIME(x) ( ( x << 1 ) ^ ( ( x & 0x80 ) ? 0x1B : 0x00 ) )
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#define MUL(x,y) ( ( x && y ) ? pow[(log[x]+log[y]) % 255] : 0 )
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#define MIX(x,y) { y = ( (y << 1) | (y >> 7) ) & 0xFF; x ^= y; }
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#define CPY128 { *RK++ = *SK++; *RK++ = *SK++; \
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*RK++ = *SK++; *RK++ = *SK++; }
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/******************************************************************************
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*
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* AES_INIT_KEYGEN_TABLES
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*
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* Fills the AES key expansion tables allocated above with their static
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* data. This is not "per key" data, but static system-wide read-only
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* table data. THIS FUNCTION IS NOT THREAD SAFE. It must be called once
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* at system initialization to setup the tables for all subsequent use.
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*
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******************************************************************************/
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void aes_init_keygen_tables(void)
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{
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int i, x, y, z; // general purpose iteration and computation locals
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int pow[256];
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int log[256];
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if (aes_tables_inited) return;
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// fill the 'pow' and 'log' tables over GF(2^8)
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for (i = 0, x = 1; i < 256; i++) {
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pow[i] = x;
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log[x] = i;
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x = (x ^ XTIME(x)) & 0xFF;
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}
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// compute the round constants
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for (i = 0, x = 1; i < 10; i++) {
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RCON[i] = (uint32_t)x;
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x = XTIME(x) & 0xFF;
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}
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// fill the forward and reverse substitution boxes
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FSb[0x00] = 0x63;
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#if AES_DECRYPTION // whether AES decryption is supported
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RSb[0x63] = 0x00;
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#endif /* AES_DECRYPTION */
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for (i = 1; i < 256; i++) {
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x = y = pow[255 - log[i]];
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MIX(x, y);
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MIX(x, y);
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MIX(x, y);
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MIX(x, y);
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FSb[i] = (uchar)(x ^= 0x63);
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#if AES_DECRYPTION // whether AES decryption is supported
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RSb[x] = (uchar)i;
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#endif /* AES_DECRYPTION */
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}
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// generate the forward and reverse key expansion tables
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for (i = 0; i < 256; i++) {
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x = FSb[i];
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y = XTIME(x) & 0xFF;
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z = (y ^ x) & 0xFF;
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FT0[i] = ((uint32_t)y) ^ ((uint32_t)x << 8) ^
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((uint32_t)x << 16) ^ ((uint32_t)z << 24);
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FT1[i] = ROTL8(FT0[i]);
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FT2[i] = ROTL8(FT1[i]);
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FT3[i] = ROTL8(FT2[i]);
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#if AES_DECRYPTION // whether AES decryption is supported
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x = RSb[i];
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RT0[i] = ((uint32_t)MUL(0x0E, x)) ^
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((uint32_t)MUL(0x09, x) << 8) ^
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((uint32_t)MUL(0x0D, x) << 16) ^
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((uint32_t)MUL(0x0B, x) << 24);
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RT1[i] = ROTL8(RT0[i]);
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RT2[i] = ROTL8(RT1[i]);
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RT3[i] = ROTL8(RT2[i]);
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#endif /* AES_DECRYPTION */
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}
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aes_tables_inited = 1; // flag that the tables have been generated
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} // to permit subsequent use of the AES cipher
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/******************************************************************************
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*
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* AES_SET_ENCRYPTION_KEY
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*
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* This is called by 'aes_setkey' when we're establishing a key for
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* subsequent encryption. We give it a pointer to the encryption
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* context, a pointer to the key, and the key's length in bytes.
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* Valid lengths are: 16, 24 or 32 bytes (128, 192, 256 bits).
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*
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******************************************************************************/
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int aes_set_encryption_key(aes_context *ctx,
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const uchar *key,
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uint keysize)
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{
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uint i; // general purpose iteration local
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uint32_t *RK = ctx->rk; // initialize our RoundKey buffer pointer
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for (i = 0; i < (keysize >> 2); i++) {
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GET_UINT32_LE(RK[i], key, i << 2);
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}
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switch (ctx->rounds)
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{
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case 10:
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for (i = 0; i < 10; i++, RK += 4) {
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RK[4] = RK[0] ^ RCON[i] ^
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((uint32_t)FSb[(RK[3] >> 8) & 0xFF]) ^
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((uint32_t)FSb[(RK[3] >> 16) & 0xFF] << 8) ^
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((uint32_t)FSb[(RK[3] >> 24) & 0xFF] << 16) ^
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((uint32_t)FSb[(RK[3]) & 0xFF] << 24);
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RK[5] = RK[1] ^ RK[4];
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RK[6] = RK[2] ^ RK[5];
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RK[7] = RK[3] ^ RK[6];
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}
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break;
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case 12:
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for (i = 0; i < 8; i++, RK += 6) {
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RK[6] = RK[0] ^ RCON[i] ^
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((uint32_t)FSb[(RK[5] >> 8) & 0xFF]) ^
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((uint32_t)FSb[(RK[5] >> 16) & 0xFF] << 8) ^
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((uint32_t)FSb[(RK[5] >> 24) & 0xFF] << 16) ^
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((uint32_t)FSb[(RK[5]) & 0xFF] << 24);
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RK[7] = RK[1] ^ RK[6];
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RK[8] = RK[2] ^ RK[7];
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RK[9] = RK[3] ^ RK[8];
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RK[10] = RK[4] ^ RK[9];
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RK[11] = RK[5] ^ RK[10];
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}
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break;
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case 14:
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for (i = 0; i < 7; i++, RK += 8) {
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RK[8] = RK[0] ^ RCON[i] ^
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((uint32_t)FSb[(RK[7] >> 8) & 0xFF]) ^
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((uint32_t)FSb[(RK[7] >> 16) & 0xFF] << 8) ^
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((uint32_t)FSb[(RK[7] >> 24) & 0xFF] << 16) ^
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((uint32_t)FSb[(RK[7]) & 0xFF] << 24);
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RK[9] = RK[1] ^ RK[8];
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RK[10] = RK[2] ^ RK[9];
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RK[11] = RK[3] ^ RK[10];
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RK[12] = RK[4] ^
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((uint32_t)FSb[(RK[11]) & 0xFF]) ^
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((uint32_t)FSb[(RK[11] >> 8) & 0xFF] << 8) ^
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((uint32_t)FSb[(RK[11] >> 16) & 0xFF] << 16) ^
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((uint32_t)FSb[(RK[11] >> 24) & 0xFF] << 24);
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RK[13] = RK[5] ^ RK[12];
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RK[14] = RK[6] ^ RK[13];
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RK[15] = RK[7] ^ RK[14];
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}
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break;
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default:
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return -1;
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}
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return(0);
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}
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||||
#if AES_DECRYPTION // whether AES decryption is supported
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* AES_SET_DECRYPTION_KEY
|
||||
*
|
||||
* This is called by 'aes_setkey' when we're establishing a
|
||||
* key for subsequent decryption. We give it a pointer to
|
||||
* the encryption context, a pointer to the key, and the key's
|
||||
* length in bits. Valid lengths are: 128, 192, or 256 bits.
|
||||
*
|
||||
******************************************************************************/
|
||||
int aes_set_decryption_key(aes_context *ctx,
|
||||
const uchar *key,
|
||||
uint keysize)
|
||||
{
|
||||
int i, j;
|
||||
aes_context cty; // a calling aes context for set_encryption_key
|
||||
uint32_t *RK = ctx->rk; // initialize our RoundKey buffer pointer
|
||||
uint32_t *SK;
|
||||
int ret;
|
||||
|
||||
cty.rounds = ctx->rounds; // initialize our local aes context
|
||||
cty.rk = cty.buf; // round count and key buf pointer
|
||||
|
||||
if ((ret = aes_set_encryption_key(&cty, key, keysize)) != 0)
|
||||
return(ret);
|
||||
|
||||
SK = cty.rk + cty.rounds * 4;
|
||||
|
||||
CPY128 // copy a 128-bit block from *SK to *RK
|
||||
|
||||
for (i = ctx->rounds - 1, SK -= 8; i > 0; i--, SK -= 8) {
|
||||
for (j = 0; j < 4; j++, SK++) {
|
||||
*RK++ = RT0[FSb[(*SK) & 0xFF]] ^
|
||||
RT1[FSb[(*SK >> 8) & 0xFF]] ^
|
||||
RT2[FSb[(*SK >> 16) & 0xFF]] ^
|
||||
RT3[FSb[(*SK >> 24) & 0xFF]];
|
||||
}
|
||||
}
|
||||
CPY128 // copy a 128-bit block from *SK to *RK
|
||||
memset(&cty, 0, sizeof(aes_context)); // clear local aes context
|
||||
return(0);
|
||||
}
|
||||
|
||||
#endif /* AES_DECRYPTION */
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* AES_SETKEY
|
||||
*
|
||||
* Invoked to establish the key schedule for subsequent encryption/decryption
|
||||
*
|
||||
******************************************************************************/
|
||||
int aes_setkey(aes_context *ctx, // AES context provided by our caller
|
||||
int mode, // ENCRYPT or DECRYPT flag
|
||||
const uchar *key, // pointer to the key
|
||||
uint keysize) // key length in bytes
|
||||
{
|
||||
// since table initialization is not thread safe, we could either add
|
||||
// system-specific mutexes and init the AES key generation tables on
|
||||
// demand, or ask the developer to simply call "gcm_initialize" once during
|
||||
// application startup before threading begins. That's what we choose.
|
||||
if (!aes_tables_inited) return (-1); // fail the call when not inited.
|
||||
|
||||
ctx->mode = mode; // capture the key type we're creating
|
||||
ctx->rk = ctx->buf; // initialize our round key pointer
|
||||
|
||||
switch (keysize) // set the rounds count based upon the keysize
|
||||
{
|
||||
case 16: ctx->rounds = 10; break; // 16-byte, 128-bit key
|
||||
case 24: ctx->rounds = 12; break; // 24-byte, 192-bit key
|
||||
case 32: ctx->rounds = 14; break; // 32-byte, 256-bit key
|
||||
default: return(-1);
|
||||
}
|
||||
|
||||
#if AES_DECRYPTION
|
||||
if (mode == DECRYPT) // expand our key for encryption or decryption
|
||||
return(aes_set_decryption_key(ctx, key, keysize));
|
||||
else /* ENCRYPT */
|
||||
#endif /* AES_DECRYPTION */
|
||||
return(aes_set_encryption_key(ctx, key, keysize));
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* AES_CIPHER
|
||||
*
|
||||
* Perform AES encryption and decryption.
|
||||
* The AES context will have been setup with the encryption mode
|
||||
* and all keying information appropriate for the task.
|
||||
*
|
||||
******************************************************************************/
|
||||
int aes_cipher(aes_context *ctx,
|
||||
const uchar input[16],
|
||||
uchar output[16])
|
||||
{
|
||||
int i;
|
||||
uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3; // general purpose locals
|
||||
|
||||
RK = ctx->rk;
|
||||
|
||||
GET_UINT32_LE(X0, input, 0); X0 ^= *RK++; // load our 128-bit
|
||||
GET_UINT32_LE(X1, input, 4); X1 ^= *RK++; // input buffer in a storage
|
||||
GET_UINT32_LE(X2, input, 8); X2 ^= *RK++; // memory endian-neutral way
|
||||
GET_UINT32_LE(X3, input, 12); X3 ^= *RK++;
|
||||
|
||||
#if AES_DECRYPTION // whether AES decryption is supported
|
||||
|
||||
if (ctx->mode == DECRYPT)
|
||||
{
|
||||
for (i = (ctx->rounds >> 1) - 1; i > 0; i--)
|
||||
{
|
||||
AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
|
||||
AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3);
|
||||
}
|
||||
|
||||
AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
|
||||
|
||||
X0 = *RK++ ^ \
|
||||
((uint32_t)RSb[(Y0) & 0xFF]) ^
|
||||
((uint32_t)RSb[(Y3 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)RSb[(Y2 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)RSb[(Y1 >> 24) & 0xFF] << 24);
|
||||
|
||||
X1 = *RK++ ^ \
|
||||
((uint32_t)RSb[(Y1) & 0xFF]) ^
|
||||
((uint32_t)RSb[(Y0 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)RSb[(Y3 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)RSb[(Y2 >> 24) & 0xFF] << 24);
|
||||
|
||||
X2 = *RK++ ^ \
|
||||
((uint32_t)RSb[(Y2) & 0xFF]) ^
|
||||
((uint32_t)RSb[(Y1 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)RSb[(Y0 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)RSb[(Y3 >> 24) & 0xFF] << 24);
|
||||
|
||||
X3 = *RK++ ^ \
|
||||
((uint32_t)RSb[(Y3) & 0xFF]) ^
|
||||
((uint32_t)RSb[(Y2 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)RSb[(Y1 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)RSb[(Y0 >> 24) & 0xFF] << 24);
|
||||
}
|
||||
else /* ENCRYPT */
|
||||
{
|
||||
#endif /* AES_DECRYPTION */
|
||||
|
||||
for (i = (ctx->rounds >> 1) - 1; i > 0; i--)
|
||||
{
|
||||
AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
|
||||
AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3);
|
||||
}
|
||||
|
||||
AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
|
||||
|
||||
X0 = *RK++ ^ \
|
||||
((uint32_t)FSb[(Y0) & 0xFF]) ^
|
||||
((uint32_t)FSb[(Y1 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)FSb[(Y2 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)FSb[(Y3 >> 24) & 0xFF] << 24);
|
||||
|
||||
X1 = *RK++ ^ \
|
||||
((uint32_t)FSb[(Y1) & 0xFF]) ^
|
||||
((uint32_t)FSb[(Y2 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)FSb[(Y3 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)FSb[(Y0 >> 24) & 0xFF] << 24);
|
||||
|
||||
X2 = *RK++ ^ \
|
||||
((uint32_t)FSb[(Y2) & 0xFF]) ^
|
||||
((uint32_t)FSb[(Y3 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)FSb[(Y0 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)FSb[(Y1 >> 24) & 0xFF] << 24);
|
||||
|
||||
X3 = *RK++ ^ \
|
||||
((uint32_t)FSb[(Y3) & 0xFF]) ^
|
||||
((uint32_t)FSb[(Y0 >> 8) & 0xFF] << 8) ^
|
||||
((uint32_t)FSb[(Y1 >> 16) & 0xFF] << 16) ^
|
||||
((uint32_t)FSb[(Y2 >> 24) & 0xFF] << 24);
|
||||
|
||||
#if AES_DECRYPTION // whether AES decryption is supported
|
||||
}
|
||||
#endif /* AES_DECRYPTION */
|
||||
|
||||
PUT_UINT32_LE(X0, output, 0);
|
||||
PUT_UINT32_LE(X1, output, 4);
|
||||
PUT_UINT32_LE(X2, output, 8);
|
||||
PUT_UINT32_LE(X3, output, 12);
|
||||
|
||||
return(0);
|
||||
}
|
||||
/* end of aes.c */
|
||||
78
nfq/crypto/aes.h
Normal file
78
nfq/crypto/aes.h
Normal file
@ -0,0 +1,78 @@
|
||||
/******************************************************************************
|
||||
*
|
||||
* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
|
||||
*
|
||||
* This is a simple and straightforward implementation of the AES Rijndael
|
||||
* 128-bit block cipher designed by Vincent Rijmen and Joan Daemen. The focus
|
||||
* of this work was correctness & accuracy. It is written in 'C' without any
|
||||
* particular focus upon optimization or speed. It should be endian (memory
|
||||
* byte order) neutral since the few places that care are handled explicitly.
|
||||
*
|
||||
* This implementation of Rijndael was created by Steven M. Gibson of GRC.com.
|
||||
*
|
||||
* It is intended for general purpose use, but was written in support of GRC's
|
||||
* reference implementation of the SQRL (Secure Quick Reliable Login) client.
|
||||
*
|
||||
* See: http://csrc.nist.gov/archive/aes/rijndael/wsdindex.html
|
||||
*
|
||||
* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
|
||||
* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
|
||||
*
|
||||
*******************************************************************************/
|
||||
|
||||
#pragma once
|
||||
|
||||
/******************************************************************************/
|
||||
#define AES_DECRYPTION 0 // whether AES decryption is supported
|
||||
/******************************************************************************/
|
||||
|
||||
#include <string.h>
|
||||
|
||||
#define ENCRYPT 1 // specify whether we're encrypting
|
||||
#define DECRYPT 0 // or decrypting
|
||||
|
||||
#if defined(_MSC_VER)
|
||||
#include <basetsd.h>
|
||||
typedef UINT32 uint32_t;
|
||||
#else
|
||||
#include <inttypes.h>
|
||||
#endif
|
||||
|
||||
typedef unsigned char uchar; // add some convienent shorter types
|
||||
typedef unsigned int uint;
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
* AES_INIT_KEYGEN_TABLES : MUST be called once before any AES use
|
||||
******************************************************************************/
|
||||
void aes_init_keygen_tables(void);
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
* AES_CONTEXT : cipher context / holds inter-call data
|
||||
******************************************************************************/
|
||||
typedef struct {
|
||||
int mode; // 1 for Encryption, 0 for Decryption
|
||||
int rounds; // keysize-based rounds count
|
||||
uint32_t *rk; // pointer to current round key
|
||||
uint32_t buf[68]; // key expansion buffer
|
||||
} aes_context;
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
* AES_SETKEY : called to expand the key for encryption or decryption
|
||||
******************************************************************************/
|
||||
int aes_setkey(aes_context *ctx, // pointer to context
|
||||
int mode, // 1 or 0 for Encrypt/Decrypt
|
||||
const uchar *key, // AES input key
|
||||
uint keysize); // size in bytes (must be 16, 24, 32 for
|
||||
// 128, 192 or 256-bit keys respectively)
|
||||
// returns 0 for success
|
||||
|
||||
/******************************************************************************
|
||||
* AES_CIPHER : called to encrypt or decrypt ONE 128-bit block of data
|
||||
******************************************************************************/
|
||||
int aes_cipher(aes_context *ctx, // pointer to context
|
||||
const uchar input[16], // 128-bit block to en/decipher
|
||||
uchar output[16]); // 128-bit output result block
|
||||
// returns 0 for success
|
||||
511
nfq/crypto/gcm.c
Normal file
511
nfq/crypto/gcm.c
Normal file
@ -0,0 +1,511 @@
|
||||
/******************************************************************************
|
||||
*
|
||||
* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
|
||||
*
|
||||
* This is a simple and straightforward implementation of AES-GCM authenticated
|
||||
* encryption. The focus of this work was correctness & accuracy. It is written
|
||||
* in straight 'C' without any particular focus upon optimization or speed. It
|
||||
* should be endian (memory byte order) neutral since the few places that care
|
||||
* are handled explicitly.
|
||||
*
|
||||
* This implementation of AES-GCM was created by Steven M. Gibson of GRC.com.
|
||||
*
|
||||
* It is intended for general purpose use, but was written in support of GRC's
|
||||
* reference implementation of the SQRL (Secure Quick Reliable Login) client.
|
||||
*
|
||||
* See: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
|
||||
* http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/
|
||||
* gcm/gcm-revised-spec.pdf
|
||||
*
|
||||
* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
|
||||
* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
|
||||
*
|
||||
*******************************************************************************/
|
||||
|
||||
#include "gcm.h"
|
||||
#include "aes.h"
|
||||
|
||||
/******************************************************************************
|
||||
* ==== IMPLEMENTATION WARNING ====
|
||||
*
|
||||
* This code was developed for use within SQRL's fixed environmnent. Thus, it
|
||||
* is somewhat less "general purpose" than it would be if it were designed as
|
||||
* a general purpose AES-GCM library. Specifically, it bothers with almost NO
|
||||
* error checking on parameter limits, buffer bounds, etc. It assumes that it
|
||||
* is being invoked by its author or by someone who understands the values it
|
||||
* expects to receive. Its behavior will be undefined otherwise.
|
||||
*
|
||||
* All functions that might fail are defined to return 'ints' to indicate a
|
||||
* problem. Most do not do so now. But this allows for error propagation out
|
||||
* of internal functions if robust error checking should ever be desired.
|
||||
*
|
||||
******************************************************************************/
|
||||
|
||||
/* Calculating the "GHASH"
|
||||
*
|
||||
* There are many ways of calculating the so-called GHASH in software, each with
|
||||
* a traditional size vs performance tradeoff. The GHASH (Galois field hash) is
|
||||
* an intriguing construction which takes two 128-bit strings (also the cipher's
|
||||
* block size and the fundamental operation size for the system) and hashes them
|
||||
* into a third 128-bit result.
|
||||
*
|
||||
* Many implementation solutions have been worked out that use large precomputed
|
||||
* table lookups in place of more time consuming bit fiddling, and this approach
|
||||
* can be scaled easily upward or downward as needed to change the time/space
|
||||
* tradeoff. It's been studied extensively and there's a solid body of theory and
|
||||
* practice. For example, without using any lookup tables an implementation
|
||||
* might obtain 119 cycles per byte throughput, whereas using a simple, though
|
||||
* large, key-specific 64 kbyte 8-bit lookup table the performance jumps to 13
|
||||
* cycles per byte.
|
||||
*
|
||||
* And Intel's processors have, since 2010, included an instruction which does
|
||||
* the entire 128x128->128 bit job in just several 64x64->128 bit pieces.
|
||||
*
|
||||
* Since SQRL is interactive, and only processing a few 128-bit blocks, I've
|
||||
* settled upon a relatively slower but appealing small-table compromise which
|
||||
* folds a bunch of not only time consuming but also bit twiddling into a simple
|
||||
* 16-entry table which is attributed to Victor Shoup's 1996 work while at
|
||||
* Bellcore: "On Fast and Provably Secure MessageAuthentication Based on
|
||||
* Universal Hashing." See: http://www.shoup.net/papers/macs.pdf
|
||||
* See, also section 4.1 of the "gcm-revised-spec" cited above.
|
||||
*/
|
||||
|
||||
/*
|
||||
* This 16-entry table of pre-computed constants is used by the
|
||||
* GHASH multiplier to improve over a strictly table-free but
|
||||
* significantly slower 128x128 bit multiple within GF(2^128).
|
||||
*/
|
||||
static const uint64_t last4[16] = {
|
||||
0x0000, 0x1c20, 0x3840, 0x2460, 0x7080, 0x6ca0, 0x48c0, 0x54e0,
|
||||
0xe100, 0xfd20, 0xd940, 0xc560, 0x9180, 0x8da0, 0xa9c0, 0xb5e0 };
|
||||
|
||||
/*
|
||||
* Platform Endianness Neutralizing Load and Store Macro definitions
|
||||
* GCM wants platform-neutral Big Endian (BE) byte ordering
|
||||
*/
|
||||
#define GET_UINT32_BE(n,b,i) { \
|
||||
(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
|
||||
| ( (uint32_t) (b)[(i) + 1] << 16 ) \
|
||||
| ( (uint32_t) (b)[(i) + 2] << 8 ) \
|
||||
| ( (uint32_t) (b)[(i) + 3] ); }
|
||||
|
||||
#define PUT_UINT32_BE(n,b,i) { \
|
||||
(b)[(i) ] = (uchar) ( (n) >> 24 ); \
|
||||
(b)[(i) + 1] = (uchar) ( (n) >> 16 ); \
|
||||
(b)[(i) + 2] = (uchar) ( (n) >> 8 ); \
|
||||
(b)[(i) + 3] = (uchar) ( (n) ); }
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_INITIALIZE
|
||||
*
|
||||
* Must be called once to initialize the GCM library.
|
||||
*
|
||||
* At present, this only calls the AES keygen table generator, which expands
|
||||
* the AES keying tables for use. This is NOT A THREAD-SAFE function, so it
|
||||
* MUST be called during system initialization before a multi-threading
|
||||
* environment is running.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_initialize(void)
|
||||
{
|
||||
aes_init_keygen_tables();
|
||||
return(0);
|
||||
}
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_MULT
|
||||
*
|
||||
* Performs a GHASH operation on the 128-bit input vector 'x', setting
|
||||
* the 128-bit output vector to 'x' times H using our precomputed tables.
|
||||
* 'x' and 'output' are seen as elements of GCM's GF(2^128) Galois field.
|
||||
*
|
||||
******************************************************************************/
|
||||
static void gcm_mult(gcm_context *ctx, // pointer to established context
|
||||
const uchar x[16], // pointer to 128-bit input vector
|
||||
uchar output[16]) // pointer to 128-bit output vector
|
||||
{
|
||||
int i;
|
||||
uchar lo, hi, rem;
|
||||
uint64_t zh, zl;
|
||||
|
||||
lo = (uchar)(x[15] & 0x0f);
|
||||
hi = (uchar)(x[15] >> 4);
|
||||
zh = ctx->HH[lo];
|
||||
zl = ctx->HL[lo];
|
||||
|
||||
for (i = 15; i >= 0; i--) {
|
||||
lo = (uchar)(x[i] & 0x0f);
|
||||
hi = (uchar)(x[i] >> 4);
|
||||
|
||||
if (i != 15) {
|
||||
rem = (uchar)(zl & 0x0f);
|
||||
zl = (zh << 60) | (zl >> 4);
|
||||
zh = (zh >> 4);
|
||||
zh ^= (uint64_t)last4[rem] << 48;
|
||||
zh ^= ctx->HH[lo];
|
||||
zl ^= ctx->HL[lo];
|
||||
}
|
||||
rem = (uchar)(zl & 0x0f);
|
||||
zl = (zh << 60) | (zl >> 4);
|
||||
zh = (zh >> 4);
|
||||
zh ^= (uint64_t)last4[rem] << 48;
|
||||
zh ^= ctx->HH[hi];
|
||||
zl ^= ctx->HL[hi];
|
||||
}
|
||||
PUT_UINT32_BE(zh >> 32, output, 0);
|
||||
PUT_UINT32_BE(zh, output, 4);
|
||||
PUT_UINT32_BE(zl >> 32, output, 8);
|
||||
PUT_UINT32_BE(zl, output, 12);
|
||||
}
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_SETKEY
|
||||
*
|
||||
* This is called to set the AES-GCM key. It initializes the AES key
|
||||
* and populates the gcm context's pre-calculated HTables.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_setkey(gcm_context *ctx, // pointer to caller-provided gcm context
|
||||
const uchar *key, // pointer to the AES encryption key
|
||||
const uint keysize) // size in bytes (must be 16, 24, 32 for
|
||||
// 128, 192 or 256-bit keys respectively)
|
||||
{
|
||||
int ret, i, j;
|
||||
uint64_t hi, lo;
|
||||
uint64_t vl, vh;
|
||||
unsigned char h[16];
|
||||
|
||||
memset(ctx, 0, sizeof(gcm_context)); // zero caller-provided GCM context
|
||||
memset(h, 0, 16); // initialize the block to encrypt
|
||||
|
||||
// encrypt the null 128-bit block to generate a key-based value
|
||||
// which is then used to initialize our GHASH lookup tables
|
||||
if ((ret = aes_setkey(&ctx->aes_ctx, ENCRYPT, key, keysize)) != 0)
|
||||
return(ret);
|
||||
if ((ret = aes_cipher(&ctx->aes_ctx, h, h)) != 0)
|
||||
return(ret);
|
||||
|
||||
GET_UINT32_BE(hi, h, 0); // pack h as two 64-bit ints, big-endian
|
||||
GET_UINT32_BE(lo, h, 4);
|
||||
vh = (uint64_t)hi << 32 | lo;
|
||||
|
||||
GET_UINT32_BE(hi, h, 8);
|
||||
GET_UINT32_BE(lo, h, 12);
|
||||
vl = (uint64_t)hi << 32 | lo;
|
||||
|
||||
ctx->HL[8] = vl; // 8 = 1000 corresponds to 1 in GF(2^128)
|
||||
ctx->HH[8] = vh;
|
||||
ctx->HH[0] = 0; // 0 corresponds to 0 in GF(2^128)
|
||||
ctx->HL[0] = 0;
|
||||
|
||||
for (i = 4; i > 0; i >>= 1) {
|
||||
uint32_t T = (uint32_t)(vl & 1) * 0xe1000000U;
|
||||
vl = (vh << 63) | (vl >> 1);
|
||||
vh = (vh >> 1) ^ ((uint64_t)T << 32);
|
||||
ctx->HL[i] = vl;
|
||||
ctx->HH[i] = vh;
|
||||
}
|
||||
for (i = 2; i < 16; i <<= 1) {
|
||||
uint64_t *HiL = ctx->HL + i, *HiH = ctx->HH + i;
|
||||
vh = *HiH;
|
||||
vl = *HiL;
|
||||
for (j = 1; j < i; j++) {
|
||||
HiH[j] = vh ^ ctx->HH[j];
|
||||
HiL[j] = vl ^ ctx->HL[j];
|
||||
}
|
||||
}
|
||||
return(0);
|
||||
}
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM processing occurs four phases: SETKEY, START, UPDATE and FINISH.
|
||||
*
|
||||
* SETKEY:
|
||||
*
|
||||
* START: Sets the Encryption/Decryption mode.
|
||||
* Accepts the initialization vector and additional data.
|
||||
*
|
||||
* UPDATE: Encrypts or decrypts the plaintext or ciphertext.
|
||||
*
|
||||
* FINISH: Performs a final GHASH to generate the authentication tag.
|
||||
*
|
||||
******************************************************************************
|
||||
*
|
||||
* GCM_START
|
||||
*
|
||||
* Given a user-provided GCM context, this initializes it, sets the encryption
|
||||
* mode, and preprocesses the initialization vector and additional AEAD data.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_start(gcm_context *ctx, // pointer to user-provided GCM context
|
||||
int mode, // GCM_ENCRYPT or GCM_DECRYPT
|
||||
const uchar *iv, // pointer to initialization vector
|
||||
size_t iv_len, // IV length in bytes (should == 12)
|
||||
const uchar *add, // ptr to additional AEAD data (NULL if none)
|
||||
size_t add_len) // length of additional AEAD data (bytes)
|
||||
{
|
||||
int ret; // our error return if the AES encrypt fails
|
||||
uchar work_buf[16]; // XOR source built from provided IV if len != 16
|
||||
const uchar *p; // general purpose array pointer
|
||||
size_t use_len; // byte count to process, up to 16 bytes
|
||||
size_t i; // local loop iterator
|
||||
|
||||
// since the context might be reused under the same key
|
||||
// we zero the working buffers for this next new process
|
||||
memset(ctx->y, 0x00, sizeof(ctx->y));
|
||||
memset(ctx->buf, 0x00, sizeof(ctx->buf));
|
||||
ctx->len = 0;
|
||||
ctx->add_len = 0;
|
||||
|
||||
ctx->mode = mode; // set the GCM encryption/decryption mode
|
||||
ctx->aes_ctx.mode = ENCRYPT; // GCM *always* runs AES in ENCRYPTION mode
|
||||
|
||||
if (iv_len == 12) { // GCM natively uses a 12-byte, 96-bit IV
|
||||
memcpy(ctx->y, iv, iv_len); // copy the IV to the top of the 'y' buff
|
||||
ctx->y[15] = 1; // start "counting" from 1 (not 0)
|
||||
}
|
||||
else // if we don't have a 12-byte IV, we GHASH whatever we've been given
|
||||
{
|
||||
memset(work_buf, 0x00, 16); // clear the working buffer
|
||||
PUT_UINT32_BE(iv_len * 8, work_buf, 12); // place the IV into buffer
|
||||
|
||||
p = iv;
|
||||
while (iv_len > 0) {
|
||||
use_len = (iv_len < 16) ? iv_len : 16;
|
||||
for (i = 0; i < use_len; i++) ctx->y[i] ^= p[i];
|
||||
gcm_mult(ctx, ctx->y, ctx->y);
|
||||
iv_len -= use_len;
|
||||
p += use_len;
|
||||
}
|
||||
for (i = 0; i < 16; i++) ctx->y[i] ^= work_buf[i];
|
||||
gcm_mult(ctx, ctx->y, ctx->y);
|
||||
}
|
||||
if ((ret = aes_cipher(&ctx->aes_ctx, ctx->y, ctx->base_ectr)) != 0)
|
||||
return(ret);
|
||||
|
||||
ctx->add_len = add_len;
|
||||
p = add;
|
||||
while (add_len > 0) {
|
||||
use_len = (add_len < 16) ? add_len : 16;
|
||||
for (i = 0; i < use_len; i++) ctx->buf[i] ^= p[i];
|
||||
gcm_mult(ctx, ctx->buf, ctx->buf);
|
||||
add_len -= use_len;
|
||||
p += use_len;
|
||||
}
|
||||
return(0);
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_UPDATE
|
||||
*
|
||||
* This is called once or more to process bulk plaintext or ciphertext data.
|
||||
* We give this some number of bytes of input and it returns the same number
|
||||
* of output bytes. If called multiple times (which is fine) all but the final
|
||||
* invocation MUST be called with length mod 16 == 0. (Only the final call can
|
||||
* have a partial block length of < 128 bits.)
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_update(gcm_context *ctx, // pointer to user-provided GCM context
|
||||
size_t length, // length, in bytes, of data to process
|
||||
const uchar *input, // pointer to source data
|
||||
uchar *output) // pointer to destination data
|
||||
{
|
||||
int ret; // our error return if the AES encrypt fails
|
||||
uchar ectr[16]; // counter-mode cipher output for XORing
|
||||
size_t use_len; // byte count to process, up to 16 bytes
|
||||
size_t i; // local loop iterator
|
||||
|
||||
ctx->len += length; // bump the GCM context's running length count
|
||||
|
||||
while (length > 0) {
|
||||
// clamp the length to process at 16 bytes
|
||||
use_len = (length < 16) ? length : 16;
|
||||
|
||||
// increment the context's 128-bit IV||Counter 'y' vector
|
||||
for (i = 16; i > 12; i--) if (++ctx->y[i - 1] != 0) break;
|
||||
|
||||
// encrypt the context's 'y' vector under the established key
|
||||
if ((ret = aes_cipher(&ctx->aes_ctx, ctx->y, ectr)) != 0)
|
||||
return(ret);
|
||||
|
||||
// encrypt or decrypt the input to the output
|
||||
if (ctx->mode == ENCRYPT)
|
||||
{
|
||||
for (i = 0; i < use_len; i++) {
|
||||
// XOR the cipher's ouptut vector (ectr) with our input
|
||||
output[i] = (uchar)(ectr[i] ^ input[i]);
|
||||
// now we mix in our data into the authentication hash.
|
||||
// if we're ENcrypting we XOR in the post-XOR (output)
|
||||
// results, but if we're DEcrypting we XOR in the input
|
||||
// data
|
||||
ctx->buf[i] ^= output[i];
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; i < use_len; i++) {
|
||||
// but if we're DEcrypting we XOR in the input data first,
|
||||
// i.e. before saving to ouput data, otherwise if the input
|
||||
// and output buffer are the same (inplace decryption) we
|
||||
// would not get the correct auth tag
|
||||
|
||||
ctx->buf[i] ^= input[i];
|
||||
|
||||
// XOR the cipher's ouptut vector (ectr) with our input
|
||||
output[i] = (uchar)(ectr[i] ^ input[i]);
|
||||
}
|
||||
}
|
||||
gcm_mult(ctx, ctx->buf, ctx->buf); // perform a GHASH operation
|
||||
|
||||
length -= use_len; // drop the remaining byte count to process
|
||||
input += use_len; // bump our input pointer forward
|
||||
output += use_len; // bump our output pointer forward
|
||||
}
|
||||
return(0);
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_FINISH
|
||||
*
|
||||
* This is called once after all calls to GCM_UPDATE to finalize the GCM.
|
||||
* It performs the final GHASH to produce the resulting authentication TAG.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_finish(gcm_context *ctx, // pointer to user-provided GCM context
|
||||
uchar *tag, // pointer to buffer which receives the tag
|
||||
size_t tag_len) // length, in bytes, of the tag-receiving buf
|
||||
{
|
||||
uchar work_buf[16];
|
||||
uint64_t orig_len = ctx->len * 8;
|
||||
uint64_t orig_add_len = ctx->add_len * 8;
|
||||
size_t i;
|
||||
|
||||
if (tag_len != 0) memcpy(tag, ctx->base_ectr, tag_len);
|
||||
|
||||
if (orig_len || orig_add_len) {
|
||||
memset(work_buf, 0x00, 16);
|
||||
|
||||
PUT_UINT32_BE((orig_add_len >> 32), work_buf, 0);
|
||||
PUT_UINT32_BE((orig_add_len), work_buf, 4);
|
||||
PUT_UINT32_BE((orig_len >> 32), work_buf, 8);
|
||||
PUT_UINT32_BE((orig_len), work_buf, 12);
|
||||
|
||||
for (i = 0; i < 16; i++) ctx->buf[i] ^= work_buf[i];
|
||||
gcm_mult(ctx, ctx->buf, ctx->buf);
|
||||
for (i = 0; i < tag_len; i++) tag[i] ^= ctx->buf[i];
|
||||
}
|
||||
return(0);
|
||||
}
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_CRYPT_AND_TAG
|
||||
*
|
||||
* This either encrypts or decrypts the user-provided data and, either
|
||||
* way, generates an authentication tag of the requested length. It must be
|
||||
* called with a GCM context whose key has already been set with GCM_SETKEY.
|
||||
*
|
||||
* The user would typically call this explicitly to ENCRYPT a buffer of data
|
||||
* and optional associated data, and produce its an authentication tag.
|
||||
*
|
||||
* To reverse the process the user would typically call the companion
|
||||
* GCM_AUTH_DECRYPT function to decrypt data and verify a user-provided
|
||||
* authentication tag. The GCM_AUTH_DECRYPT function calls this function
|
||||
* to perform its decryption and tag generation, which it then compares.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_crypt_and_tag(
|
||||
gcm_context *ctx, // gcm context with key already setup
|
||||
int mode, // cipher direction: GCM_ENCRYPT or GCM_DECRYPT
|
||||
const uchar *iv, // pointer to the 12-byte initialization vector
|
||||
size_t iv_len, // byte length if the IV. should always be 12
|
||||
const uchar *add, // pointer to the non-ciphered additional data
|
||||
size_t add_len, // byte length of the additional AEAD data
|
||||
const uchar *input, // pointer to the cipher data source
|
||||
uchar *output, // pointer to the cipher data destination
|
||||
size_t length, // byte length of the cipher data
|
||||
uchar *tag, // pointer to the tag to be generated
|
||||
size_t tag_len) // byte length of the tag to be generated
|
||||
{ /*
|
||||
assuming that the caller has already invoked gcm_setkey to
|
||||
prepare the gcm context with the keying material, we simply
|
||||
invoke each of the three GCM sub-functions in turn...
|
||||
*/
|
||||
gcm_start(ctx, mode, iv, iv_len, add, add_len);
|
||||
gcm_update(ctx, length, input, output);
|
||||
gcm_finish(ctx, tag, tag_len);
|
||||
return(0);
|
||||
}
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_AUTH_DECRYPT
|
||||
*
|
||||
* This DECRYPTS a user-provided data buffer with optional associated data.
|
||||
* It then verifies a user-supplied authentication tag against the tag just
|
||||
* re-created during decryption to verify that the data has not been altered.
|
||||
*
|
||||
* This function calls GCM_CRYPT_AND_TAG (above) to perform the decryption
|
||||
* and authentication tag generation.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_auth_decrypt(
|
||||
gcm_context *ctx, // gcm context with key already setup
|
||||
const uchar *iv, // pointer to the 12-byte initialization vector
|
||||
size_t iv_len, // byte length if the IV. should always be 12
|
||||
const uchar *add, // pointer to the non-ciphered additional data
|
||||
size_t add_len, // byte length of the additional AEAD data
|
||||
const uchar *input, // pointer to the cipher data source
|
||||
uchar *output, // pointer to the cipher data destination
|
||||
size_t length, // byte length of the cipher data
|
||||
const uchar *tag, // pointer to the tag to be authenticated
|
||||
size_t tag_len) // byte length of the tag <= 16
|
||||
{
|
||||
uchar check_tag[16]; // the tag generated and returned by decryption
|
||||
int diff; // an ORed flag to detect authentication errors
|
||||
size_t i; // our local iterator
|
||||
/*
|
||||
we use GCM_DECRYPT_AND_TAG (above) to perform our decryption
|
||||
(which is an identical XORing to reverse the previous one)
|
||||
and also to re-generate the matching authentication tag
|
||||
*/
|
||||
gcm_crypt_and_tag(ctx, DECRYPT, iv, iv_len, add, add_len,
|
||||
input, output, length, check_tag, tag_len);
|
||||
|
||||
// now we verify the authentication tag in 'constant time'
|
||||
for (diff = 0, i = 0; i < tag_len; i++)
|
||||
diff |= tag[i] ^ check_tag[i];
|
||||
|
||||
if (diff != 0) { // see whether any bits differed?
|
||||
memset(output, 0, length); // if so... wipe the output data
|
||||
return(GCM_AUTH_FAILURE); // return GCM_AUTH_FAILURE
|
||||
}
|
||||
return(0);
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_ZERO_CTX
|
||||
*
|
||||
* The GCM context contains both the GCM context and the AES context.
|
||||
* This includes keying and key-related material which is security-
|
||||
* sensitive, so it MUST be zeroed after use. This function does that.
|
||||
*
|
||||
******************************************************************************/
|
||||
void gcm_zero_ctx(gcm_context *ctx)
|
||||
{
|
||||
// zero the context originally provided to us
|
||||
memset(ctx, 0, sizeof(gcm_context));
|
||||
}
|
||||
183
nfq/crypto/gcm.h
Normal file
183
nfq/crypto/gcm.h
Normal file
@ -0,0 +1,183 @@
|
||||
/******************************************************************************
|
||||
*
|
||||
* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
|
||||
*
|
||||
* This is a simple and straightforward implementation of AES-GCM authenticated
|
||||
* encryption. The focus of this work was correctness & accuracy. It is written
|
||||
* in straight 'C' without any particular focus upon optimization or speed. It
|
||||
* should be endian (memory byte order) neutral since the few places that care
|
||||
* are handled explicitly.
|
||||
*
|
||||
* This implementation of AES-GCM was created by Steven M. Gibson of GRC.com.
|
||||
*
|
||||
* It is intended for general purpose use, but was written in support of GRC's
|
||||
* reference implementation of the SQRL (Secure Quick Reliable Login) client.
|
||||
*
|
||||
* See: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
|
||||
* http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/ \
|
||||
* gcm/gcm-revised-spec.pdf
|
||||
*
|
||||
* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
|
||||
* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
|
||||
*
|
||||
*******************************************************************************/
|
||||
#pragma once
|
||||
|
||||
#define GCM_AUTH_FAILURE 0x55555555 // authentication failure
|
||||
|
||||
#include "aes.h" // gcm_context includes aes_context
|
||||
|
||||
#if defined(_MSC_VER)
|
||||
#include <basetsd.h>
|
||||
typedef unsigned int size_t;// use the right type for length declarations
|
||||
typedef UINT32 uint32_t;
|
||||
typedef UINT64 uint64_t;
|
||||
#else
|
||||
#include <stdint.h>
|
||||
#endif
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
* GCM_CONTEXT : GCM context / holds keytables, instance data, and AES ctx
|
||||
******************************************************************************/
|
||||
typedef struct {
|
||||
int mode; // cipher direction: encrypt/decrypt
|
||||
uint64_t len; // cipher data length processed so far
|
||||
uint64_t add_len; // total add data length
|
||||
uint64_t HL[16]; // precalculated lo-half HTable
|
||||
uint64_t HH[16]; // precalculated hi-half HTable
|
||||
uchar base_ectr[16]; // first counter-mode cipher output for tag
|
||||
uchar y[16]; // the current cipher-input IV|Counter value
|
||||
uchar buf[16]; // buf working value
|
||||
aes_context aes_ctx; // cipher context used
|
||||
} gcm_context;
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
* GCM_CONTEXT : MUST be called once before ANY use of this library
|
||||
******************************************************************************/
|
||||
int gcm_initialize(void);
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
* GCM_SETKEY : sets the GCM (and AES) keying material for use
|
||||
******************************************************************************/
|
||||
int gcm_setkey(gcm_context *ctx, // caller-provided context ptr
|
||||
const uchar *key, // pointer to cipher key
|
||||
const uint keysize // size in bytes (must be 16, 24, 32 for
|
||||
// 128, 192 or 256-bit keys respectively)
|
||||
); // returns 0 for success
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_CRYPT_AND_TAG
|
||||
*
|
||||
* This either encrypts or decrypts the user-provided data and, either
|
||||
* way, generates an authentication tag of the requested length. It must be
|
||||
* called with a GCM context whose key has already been set with GCM_SETKEY.
|
||||
*
|
||||
* The user would typically call this explicitly to ENCRYPT a buffer of data
|
||||
* and optional associated data, and produce its an authentication tag.
|
||||
*
|
||||
* To reverse the process the user would typically call the companion
|
||||
* GCM_AUTH_DECRYPT function to decrypt data and verify a user-provided
|
||||
* authentication tag. The GCM_AUTH_DECRYPT function calls this function
|
||||
* to perform its decryption and tag generation, which it then compares.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_crypt_and_tag(
|
||||
gcm_context *ctx, // gcm context with key already setup
|
||||
int mode, // cipher direction: ENCRYPT (1) or DECRYPT (0)
|
||||
const uchar *iv, // pointer to the 12-byte initialization vector
|
||||
size_t iv_len, // byte length if the IV. should always be 12
|
||||
const uchar *add, // pointer to the non-ciphered additional data
|
||||
size_t add_len, // byte length of the additional AEAD data
|
||||
const uchar *input, // pointer to the cipher data source
|
||||
uchar *output, // pointer to the cipher data destination
|
||||
size_t length, // byte length of the cipher data
|
||||
uchar *tag, // pointer to the tag to be generated
|
||||
size_t tag_len); // byte length of the tag to be generated
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_AUTH_DECRYPT
|
||||
*
|
||||
* This DECRYPTS a user-provided data buffer with optional associated data.
|
||||
* It then verifies a user-supplied authentication tag against the tag just
|
||||
* re-created during decryption to verify that the data has not been altered.
|
||||
*
|
||||
* This function calls GCM_CRYPT_AND_TAG (above) to perform the decryption
|
||||
* and authentication tag generation.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_auth_decrypt(
|
||||
gcm_context *ctx, // gcm context with key already setup
|
||||
const uchar *iv, // pointer to the 12-byte initialization vector
|
||||
size_t iv_len, // byte length if the IV. should always be 12
|
||||
const uchar *add, // pointer to the non-ciphered additional data
|
||||
size_t add_len, // byte length of the additional AEAD data
|
||||
const uchar *input, // pointer to the cipher data source
|
||||
uchar *output, // pointer to the cipher data destination
|
||||
size_t length, // byte length of the cipher data
|
||||
const uchar *tag, // pointer to the tag to be authenticated
|
||||
size_t tag_len); // byte length of the tag <= 16
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_START
|
||||
*
|
||||
* Given a user-provided GCM context, this initializes it, sets the encryption
|
||||
* mode, and preprocesses the initialization vector and additional AEAD data.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_start(gcm_context *ctx, // pointer to user-provided GCM context
|
||||
int mode, // ENCRYPT (1) or DECRYPT (0)
|
||||
const uchar *iv, // pointer to initialization vector
|
||||
size_t iv_len, // IV length in bytes (should == 12)
|
||||
const uchar *add, // pointer to additional AEAD data (NULL if none)
|
||||
size_t add_len); // length of additional AEAD data (bytes)
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_UPDATE
|
||||
*
|
||||
* This is called once or more to process bulk plaintext or ciphertext data.
|
||||
* We give this some number of bytes of input and it returns the same number
|
||||
* of output bytes. If called multiple times (which is fine) all but the final
|
||||
* invocation MUST be called with length mod 16 == 0. (Only the final call can
|
||||
* have a partial block length of < 128 bits.)
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_update(gcm_context *ctx, // pointer to user-provided GCM context
|
||||
size_t length, // length, in bytes, of data to process
|
||||
const uchar *input, // pointer to source data
|
||||
uchar *output); // pointer to destination data
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_FINISH
|
||||
*
|
||||
* This is called once after all calls to GCM_UPDATE to finalize the GCM.
|
||||
* It performs the final GHASH to produce the resulting authentication TAG.
|
||||
*
|
||||
******************************************************************************/
|
||||
int gcm_finish(gcm_context *ctx, // pointer to user-provided GCM context
|
||||
uchar *tag, // ptr to tag buffer - NULL if tag_len = 0
|
||||
size_t tag_len); // length, in bytes, of the tag-receiving buf
|
||||
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* GCM_ZERO_CTX
|
||||
*
|
||||
* The GCM context contains both the GCM context and the AES context.
|
||||
* This includes keying and key-related material which is security-
|
||||
* sensitive, so it MUST be zeroed after use. This function does that.
|
||||
*
|
||||
******************************************************************************/
|
||||
void gcm_zero_ctx(gcm_context *ctx);
|
||||
337
nfq/crypto/hkdf.c
Normal file
337
nfq/crypto/hkdf.c
Normal file
@ -0,0 +1,337 @@
|
||||
/**************************** hkdf.c ***************************/
|
||||
/***************** See RFC 6234 for details. *******************/
|
||||
/* Copyright (c) 2011 IETF Trust and the persons identified as */
|
||||
/* authors of the code. All rights reserved. */
|
||||
/* See sha.h for terms of use and redistribution. */
|
||||
|
||||
/*
|
||||
* Description:
|
||||
* This file implements the HKDF algorithm (HMAC-based
|
||||
* Extract-and-Expand Key Derivation Function, RFC 5869),
|
||||
* expressed in terms of the various SHA algorithms.
|
||||
*/
|
||||
|
||||
#include "sha.h"
|
||||
#include <string.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
/*
|
||||
* hkdf
|
||||
*
|
||||
* Description:
|
||||
* This function will generate keying material using HKDF.
|
||||
*
|
||||
* Parameters:
|
||||
* whichSha: [in]
|
||||
* One of SHA1, SHA224, SHA256, SHA384, SHA512
|
||||
* salt[ ]: [in]
|
||||
* The optional salt value (a non-secret random value);
|
||||
* if not provided (salt == NULL), it is set internally
|
||||
* to a string of HashLen(whichSha) zeros.
|
||||
* salt_len: [in]
|
||||
* The length of the salt value. (Ignored if salt == NULL.)
|
||||
* ikm[ ]: [in]
|
||||
* Input keying material.
|
||||
* ikm_len: [in]
|
||||
* The length of the input keying material.
|
||||
* info[ ]: [in]
|
||||
* The optional context and application specific information.
|
||||
* If info == NULL or a zero-length string, it is ignored.
|
||||
* info_len: [in]
|
||||
* The length of the optional context and application specific
|
||||
* information. (Ignored if info == NULL.)
|
||||
* okm[ ]: [out]
|
||||
* Where the HKDF is to be stored.
|
||||
* okm_len: [in]
|
||||
* The length of the buffer to hold okm.
|
||||
* okm_len must be <= 255 * USHABlockSize(whichSha)
|
||||
*
|
||||
* Notes:
|
||||
* Calls hkdfExtract() and hkdfExpand().
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hkdf(SHAversion whichSha,
|
||||
const unsigned char *salt, size_t salt_len,
|
||||
const unsigned char *ikm, size_t ikm_len,
|
||||
const unsigned char *info, size_t info_len,
|
||||
uint8_t okm[], size_t okm_len)
|
||||
{
|
||||
uint8_t prk[USHAMaxHashSize];
|
||||
return hkdfExtract(whichSha, salt, salt_len, ikm, ikm_len, prk) ||
|
||||
hkdfExpand(whichSha, prk, USHAHashSize(whichSha), info,
|
||||
info_len, okm, okm_len);
|
||||
}
|
||||
|
||||
/*
|
||||
* hkdfExtract
|
||||
*
|
||||
* Description:
|
||||
* This function will perform HKDF extraction.
|
||||
*
|
||||
* Parameters:
|
||||
* whichSha: [in]
|
||||
* One of SHA1, SHA224, SHA256, SHA384, SHA512
|
||||
* salt[ ]: [in]
|
||||
* The optional salt value (a non-secret random value);
|
||||
* if not provided (salt == NULL), it is set internally
|
||||
* to a string of HashLen(whichSha) zeros.
|
||||
* salt_len: [in]
|
||||
* The length of the salt value. (Ignored if salt == NULL.)
|
||||
* ikm[ ]: [in]
|
||||
* Input keying material.
|
||||
* ikm_len: [in]
|
||||
* The length of the input keying material.
|
||||
* prk[ ]: [out]
|
||||
* Array where the HKDF extraction is to be stored.
|
||||
* Must be larger than USHAHashSize(whichSha);
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hkdfExtract(SHAversion whichSha,
|
||||
const unsigned char *salt, size_t salt_len,
|
||||
const unsigned char *ikm, size_t ikm_len,
|
||||
uint8_t prk[USHAMaxHashSize])
|
||||
{
|
||||
unsigned char nullSalt[USHAMaxHashSize];
|
||||
if (salt == 0) {
|
||||
salt = nullSalt;
|
||||
salt_len = USHAHashSize(whichSha);
|
||||
memset(nullSalt, '\0', salt_len);
|
||||
}
|
||||
else if (salt_len < 0) {
|
||||
return shaBadParam;
|
||||
}
|
||||
return hmac(whichSha, ikm, ikm_len, salt, salt_len, prk);
|
||||
}
|
||||
|
||||
/*
|
||||
* hkdfExpand
|
||||
*
|
||||
* Description:
|
||||
* This function will perform HKDF expansion.
|
||||
*
|
||||
* Parameters:
|
||||
* whichSha: [in]
|
||||
* One of SHA1, SHA224, SHA256, SHA384, SHA512
|
||||
* prk[ ]: [in]
|
||||
* The pseudo-random key to be expanded; either obtained
|
||||
* directly from a cryptographically strong, uniformly
|
||||
* distributed pseudo-random number generator, or as the
|
||||
* output from hkdfExtract().
|
||||
* prk_len: [in]
|
||||
* The length of the pseudo-random key in prk;
|
||||
* should at least be equal to USHAHashSize(whichSHA).
|
||||
* info[ ]: [in]
|
||||
* The optional context and application specific information.
|
||||
* If info == NULL or a zero-length string, it is ignored.
|
||||
* info_len: [in]
|
||||
* The length of the optional context and application specific
|
||||
* information. (Ignored if info == NULL.)
|
||||
* okm[ ]: [out]
|
||||
* Where the HKDF is to be stored.
|
||||
* okm_len: [in]
|
||||
* The length of the buffer to hold okm.
|
||||
* okm_len must be <= 255 * USHABlockSize(whichSha)
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hkdfExpand(SHAversion whichSha, const uint8_t prk[], size_t prk_len,
|
||||
const unsigned char *info, size_t info_len,
|
||||
uint8_t okm[], size_t okm_len)
|
||||
{
|
||||
size_t hash_len, N;
|
||||
unsigned char T[USHAMaxHashSize];
|
||||
size_t Tlen, where, i;
|
||||
|
||||
if (info == 0) {
|
||||
info = (const unsigned char *)"";
|
||||
info_len = 0;
|
||||
}
|
||||
else if (info_len < 0) {
|
||||
return shaBadParam;
|
||||
}
|
||||
if (okm_len <= 0) return shaBadParam;
|
||||
if (!okm) return shaBadParam;
|
||||
|
||||
hash_len = USHAHashSize(whichSha);
|
||||
if (prk_len < hash_len) return shaBadParam;
|
||||
N = okm_len / hash_len;
|
||||
if ((okm_len % hash_len) != 0) N++;
|
||||
if (N > 255) return shaBadParam;
|
||||
|
||||
Tlen = 0;
|
||||
where = 0;
|
||||
for (i = 1; i <= N; i++) {
|
||||
HMACContext context;
|
||||
unsigned char c = i;
|
||||
int ret = hmacReset(&context, whichSha, prk, prk_len) ||
|
||||
hmacInput(&context, T, Tlen) ||
|
||||
hmacInput(&context, info, info_len) ||
|
||||
hmacInput(&context, &c, 1) ||
|
||||
hmacResult(&context, T);
|
||||
if (ret != shaSuccess) return ret;
|
||||
memcpy(okm + where, T,
|
||||
(i != N) ? hash_len : (okm_len - where));
|
||||
where += hash_len;
|
||||
Tlen = hash_len;
|
||||
}
|
||||
return shaSuccess;
|
||||
}
|
||||
|
||||
/*
|
||||
* hkdfReset
|
||||
*
|
||||
* Description:
|
||||
* This function will initialize the hkdfContext in preparation
|
||||
* for key derivation using the modular HKDF interface for
|
||||
* arbitrary length inputs.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
* whichSha: [in]
|
||||
* One of SHA1, SHA224, SHA256, SHA384, SHA512
|
||||
* salt[ ]: [in]
|
||||
* The optional salt value (a non-secret random value);
|
||||
* if not provided (salt == NULL), it is set internally
|
||||
* to a string of HashLen(whichSha) zeros.
|
||||
* salt_len: [in]
|
||||
* The length of the salt value. (Ignored if salt == NULL.)
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hkdfReset(HKDFContext *context, enum SHAversion whichSha,
|
||||
const unsigned char *salt, size_t salt_len)
|
||||
{
|
||||
unsigned char nullSalt[USHAMaxHashSize];
|
||||
if (!context) return shaNull;
|
||||
|
||||
context->whichSha = whichSha;
|
||||
context->hashSize = USHAHashSize(whichSha);
|
||||
if (salt == 0) {
|
||||
salt = nullSalt;
|
||||
salt_len = context->hashSize;
|
||||
memset(nullSalt, '\0', salt_len);
|
||||
}
|
||||
|
||||
return hmacReset(&context->hmacContext, whichSha, salt, salt_len);
|
||||
}
|
||||
|
||||
/*
|
||||
* hkdfInput
|
||||
*
|
||||
* Description:
|
||||
* This function accepts an array of octets as the next portion
|
||||
* of the input keying material. It may be called multiple times.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The HKDF context to update.
|
||||
* ikm[ ]: [in]
|
||||
* An array of octets representing the next portion of
|
||||
* the input keying material.
|
||||
* ikm_len: [in]
|
||||
* The length of ikm.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hkdfInput(HKDFContext *context, const unsigned char *ikm,
|
||||
size_t ikm_len)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
return hmacInput(&context->hmacContext, ikm, ikm_len);
|
||||
}
|
||||
|
||||
/*
|
||||
* hkdfFinalBits
|
||||
*
|
||||
* Description:
|
||||
* This function will add in any final bits of the
|
||||
* input keying material.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The HKDF context to update
|
||||
* ikm_bits: [in]
|
||||
* The final bits of the input keying material, in the upper
|
||||
* portion of the byte. (Use 0b###00000 instead of 0b00000###
|
||||
* to input the three bits ###.)
|
||||
* ikm_bit_count: [in]
|
||||
* The number of bits in message_bits, between 1 and 7.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int hkdfFinalBits(HKDFContext *context, uint8_t ikm_bits,
|
||||
unsigned int ikm_bit_count)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
return hmacFinalBits(&context->hmacContext, ikm_bits, ikm_bit_count);
|
||||
}
|
||||
|
||||
/*
|
||||
* hkdfResult
|
||||
*
|
||||
* Description:
|
||||
* This function will finish the HKDF extraction and perform the
|
||||
* final HKDF expansion.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The HKDF context to use to calculate the HKDF hash.
|
||||
* prk[ ]: [out]
|
||||
* An optional location to store the HKDF extraction.
|
||||
* Either NULL, or pointer to a buffer that must be
|
||||
* larger than USHAHashSize(whichSha);
|
||||
* info[ ]: [in]
|
||||
* The optional context and application specific information.
|
||||
* If info == NULL or a zero-length string, it is ignored.
|
||||
* info_len: [in]
|
||||
* The length of the optional context and application specific
|
||||
* information. (Ignored if info == NULL.)
|
||||
* okm[ ]: [out]
|
||||
* Where the HKDF is to be stored.
|
||||
* okm_len: [in]
|
||||
* The length of the buffer to hold okm.
|
||||
* okm_len must be <= 255 * USHABlockSize(whichSha)
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hkdfResult(HKDFContext *context,
|
||||
uint8_t prk[USHAMaxHashSize],
|
||||
const unsigned char *info, size_t info_len,
|
||||
uint8_t okm[], size_t okm_len)
|
||||
{
|
||||
uint8_t prkbuf[USHAMaxHashSize];
|
||||
int ret;
|
||||
|
||||
if (!context) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
if (!okm) return context->Corrupted = shaBadParam;
|
||||
if (!prk) prk = prkbuf;
|
||||
|
||||
ret = hmacResult(&context->hmacContext, prk) ||
|
||||
hkdfExpand(context->whichSha, prk, context->hashSize, info,
|
||||
info_len, okm, okm_len);
|
||||
context->Computed = 1;
|
||||
return context->Corrupted = ret;
|
||||
}
|
||||
|
||||
250
nfq/crypto/hmac.c
Normal file
250
nfq/crypto/hmac.c
Normal file
@ -0,0 +1,250 @@
|
||||
/**************************** hmac.c ***************************/
|
||||
/***************** See RFC 6234 for details. *******************/
|
||||
/* Copyright (c) 2011 IETF Trust and the persons identified as */
|
||||
/* authors of the code. All rights reserved. */
|
||||
/* See sha.h for terms of use and redistribution. */
|
||||
|
||||
/*
|
||||
* Description:
|
||||
* This file implements the HMAC algorithm (Keyed-Hashing for
|
||||
* Message Authentication, [RFC 2104]), expressed in terms of
|
||||
* the various SHA algorithms.
|
||||
*/
|
||||
|
||||
#include "sha.h"
|
||||
#include <stddef.h>
|
||||
|
||||
/*
|
||||
* hmac
|
||||
*
|
||||
* Description:
|
||||
* This function will compute an HMAC message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* whichSha: [in]
|
||||
* One of SHA1, SHA224, SHA256, SHA384, SHA512
|
||||
* message_array[ ]: [in]
|
||||
* An array of octets representing the message.
|
||||
* Note: in RFC 2104, this parameter is known
|
||||
* as 'text'.
|
||||
* length: [in]
|
||||
* The length of the message in message_array.
|
||||
* key[ ]: [in]
|
||||
* The secret shared key.
|
||||
* key_len: [in]
|
||||
* The length of the secret shared key.
|
||||
* digest[ ]: [out]
|
||||
* Where the digest is to be returned.
|
||||
* NOTE: The length of the digest is determined by
|
||||
* the value of whichSha.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
|
||||
int hmac(SHAversion whichSha,
|
||||
const unsigned char *message_array, size_t length,
|
||||
const unsigned char *key, size_t key_len,
|
||||
uint8_t digest[USHAMaxHashSize])
|
||||
{
|
||||
HMACContext context;
|
||||
return hmacReset(&context, whichSha, key, key_len) ||
|
||||
hmacInput(&context, message_array, length) ||
|
||||
hmacResult(&context, digest);
|
||||
}
|
||||
|
||||
/*
|
||||
* hmacReset
|
||||
*
|
||||
* Description:
|
||||
* This function will initialize the hmacContext in preparation
|
||||
* for computing a new HMAC message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
* whichSha: [in]
|
||||
* One of SHA1, SHA224, SHA256, SHA384, SHA512
|
||||
* key[ ]: [in]
|
||||
* The secret shared key.
|
||||
* key_len: [in]
|
||||
* The length of the secret shared key.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hmacReset(HMACContext *context, enum SHAversion whichSha,
|
||||
const unsigned char *key, size_t key_len)
|
||||
{
|
||||
size_t i, blocksize, hashsize;
|
||||
int ret;
|
||||
|
||||
/* inner padding - key XORd with ipad */
|
||||
unsigned char k_ipad[USHA_Max_Message_Block_Size];
|
||||
|
||||
/* temporary buffer when keylen > blocksize */
|
||||
unsigned char tempkey[USHAMaxHashSize];
|
||||
|
||||
if (!context) return shaNull;
|
||||
context->Computed = 0;
|
||||
context->Corrupted = shaSuccess;
|
||||
|
||||
blocksize = context->blockSize = USHABlockSize(whichSha);
|
||||
hashsize = context->hashSize = USHAHashSize(whichSha);
|
||||
context->whichSha = whichSha;
|
||||
|
||||
/*
|
||||
* If key is longer than the hash blocksize,
|
||||
* reset it to key = HASH(key).
|
||||
*/
|
||||
if (key_len > blocksize) {
|
||||
USHAContext tcontext;
|
||||
int err = USHAReset(&tcontext, whichSha) ||
|
||||
USHAInput(&tcontext, key, key_len) ||
|
||||
USHAResult(&tcontext, tempkey);
|
||||
if (err != shaSuccess) return err;
|
||||
|
||||
key = tempkey;
|
||||
key_len = hashsize;
|
||||
}
|
||||
|
||||
/*
|
||||
* The HMAC transform looks like:
|
||||
*
|
||||
* SHA(K XOR opad, SHA(K XOR ipad, text))
|
||||
*
|
||||
* where K is an n byte key, 0-padded to a total of blocksize bytes,
|
||||
* ipad is the byte 0x36 repeated blocksize times,
|
||||
* opad is the byte 0x5c repeated blocksize times,
|
||||
* and text is the data being protected.
|
||||
*/
|
||||
|
||||
/* store key into the pads, XOR'd with ipad and opad values */
|
||||
for (i = 0; i < key_len; i++) {
|
||||
k_ipad[i] = key[i] ^ 0x36;
|
||||
context->k_opad[i] = key[i] ^ 0x5c;
|
||||
}
|
||||
/* remaining pad bytes are '\0' XOR'd with ipad and opad values */
|
||||
for (; i < blocksize; i++) {
|
||||
k_ipad[i] = 0x36;
|
||||
context->k_opad[i] = 0x5c;
|
||||
}
|
||||
|
||||
/* perform inner hash */
|
||||
/* init context for 1st pass */
|
||||
ret = USHAReset(&context->shaContext, whichSha) ||
|
||||
/* and start with inner pad */
|
||||
USHAInput(&context->shaContext, k_ipad, blocksize);
|
||||
return context->Corrupted = ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* hmacInput
|
||||
*
|
||||
* Description:
|
||||
* This function accepts an array of octets as the next portion
|
||||
* of the message. It may be called multiple times.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The HMAC context to update.
|
||||
* text[ ]: [in]
|
||||
* An array of octets representing the next portion of
|
||||
* the message.
|
||||
* text_len: [in]
|
||||
* The length of the message in text.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hmacInput(HMACContext *context, const unsigned char *text,
|
||||
size_t text_len)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
/* then text of datagram */
|
||||
return context->Corrupted =
|
||||
USHAInput(&context->shaContext, text, text_len);
|
||||
}
|
||||
|
||||
/*
|
||||
* hmacFinalBits
|
||||
*
|
||||
* Description:
|
||||
* This function will add in any final bits of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The HMAC context to update.
|
||||
* message_bits: [in]
|
||||
* The final bits of the message, in the upper portion of the
|
||||
* byte. (Use 0b###00000 instead of 0b00000### to input the
|
||||
* three bits ###.)
|
||||
* length: [in]
|
||||
* The number of bits in message_bits, between 1 and 7.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int hmacFinalBits(HMACContext *context,
|
||||
uint8_t bits, unsigned int bit_count)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
/* then final bits of datagram */
|
||||
return context->Corrupted =
|
||||
USHAFinalBits(&context->shaContext, bits, bit_count);
|
||||
}
|
||||
|
||||
/*
|
||||
* hmacResult
|
||||
*
|
||||
* Description:
|
||||
* This function will return the N-byte message digest into the
|
||||
* Message_Digest array provided by the caller.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to use to calculate the HMAC hash.
|
||||
* digest[ ]: [out]
|
||||
* Where the digest is returned.
|
||||
* NOTE 2: The length of the hash is determined by the value of
|
||||
* whichSha that was passed to hmacReset().
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int hmacResult(HMACContext *context, uint8_t *digest)
|
||||
{
|
||||
int ret;
|
||||
if (!context) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
|
||||
/* finish up 1st pass */
|
||||
/* (Use digest here as a temporary buffer.) */
|
||||
ret =
|
||||
USHAResult(&context->shaContext, digest) ||
|
||||
|
||||
/* perform outer SHA */
|
||||
/* init context for 2nd pass */
|
||||
USHAReset(&context->shaContext, context->whichSha) ||
|
||||
|
||||
/* start with outer pad */
|
||||
USHAInput(&context->shaContext, context->k_opad,
|
||||
context->blockSize) ||
|
||||
|
||||
/* then results of 1st hash */
|
||||
USHAInput(&context->shaContext, digest, context->hashSize) ||
|
||||
/* finish up 2nd pass */
|
||||
USHAResult(&context->shaContext, digest);
|
||||
|
||||
context->Computed = 1;
|
||||
return context->Corrupted = ret;
|
||||
}
|
||||
25
nfq/crypto/sha-private.h
Normal file
25
nfq/crypto/sha-private.h
Normal file
@ -0,0 +1,25 @@
|
||||
/************************ sha-private.h ************************/
|
||||
/***************** See RFC 6234 for details. *******************/
|
||||
#pragma once
|
||||
/*
|
||||
* These definitions are defined in FIPS 180-3, section 4.1.
|
||||
* Ch() and Maj() are defined identically in sections 4.1.1,
|
||||
* 4.1.2, and 4.1.3.
|
||||
*
|
||||
* The definitions used in FIPS 180-3 are as follows:
|
||||
*/
|
||||
|
||||
#ifndef USE_MODIFIED_MACROS
|
||||
#define SHA_Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
|
||||
#define SHA_Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
|
||||
#else /* USE_MODIFIED_MACROS */
|
||||
/*
|
||||
* The following definitions are equivalent and potentially faster.
|
||||
*/
|
||||
|
||||
#define SHA_Ch(x, y, z) (((x) & ((y) ^ (z))) ^ (z))
|
||||
#define SHA_Maj(x, y, z) (((x) & ((y) | (z))) | ((y) & (z)))
|
||||
|
||||
#endif /* USE_MODIFIED_MACROS */
|
||||
|
||||
#define SHA_Parity(x, y, z) ((x) ^ (y) ^ (z))
|
||||
244
nfq/crypto/sha.h
Normal file
244
nfq/crypto/sha.h
Normal file
@ -0,0 +1,244 @@
|
||||
#pragma once
|
||||
|
||||
/*
|
||||
* Description:
|
||||
* This file implements the Secure Hash Algorithms
|
||||
* as defined in the U.S. National Institute of Standards
|
||||
* and Technology Federal Information Processing Standards
|
||||
* Publication (FIPS PUB) 180-3 published in October 2008
|
||||
* and formerly defined in its predecessors, FIPS PUB 180-1
|
||||
* and FIP PUB 180-2.
|
||||
*
|
||||
* A combined document showing all algorithms is available at
|
||||
* http://csrc.nist.gov/publications/fips/
|
||||
* fips180-3/fips180-3_final.pdf
|
||||
*
|
||||
* The five hashes are defined in these sizes:
|
||||
* SHA-1 20 byte / 160 bit
|
||||
* SHA-224 28 byte / 224 bit
|
||||
* SHA-256 32 byte / 256 bit
|
||||
* SHA-384 48 byte / 384 bit
|
||||
* SHA-512 64 byte / 512 bit
|
||||
*
|
||||
* Compilation Note:
|
||||
* These files may be compiled with two options:
|
||||
* USE_32BIT_ONLY - use 32-bit arithmetic only, for systems
|
||||
* without 64-bit integers
|
||||
*
|
||||
* USE_MODIFIED_MACROS - use alternate form of the SHA_Ch()
|
||||
* and SHA_Maj() macros that are equivalent
|
||||
* and potentially faster on many systems
|
||||
*
|
||||
*/
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stddef.h>
|
||||
|
||||
/*
|
||||
* If you do not have the ISO standard stdint.h header file, then you
|
||||
* must typedef the following:
|
||||
* name meaning
|
||||
* uint64_t unsigned 64-bit integer
|
||||
* uint32_t unsigned 32-bit integer
|
||||
* uint8_t unsigned 8-bit integer (i.e., unsigned char)
|
||||
* int_least16_t integer of >= 16 bits
|
||||
*
|
||||
* See stdint-example.h
|
||||
*/
|
||||
|
||||
#ifndef _SHA_enum_
|
||||
#define _SHA_enum_
|
||||
/*
|
||||
* All SHA functions return one of these values.
|
||||
*/
|
||||
enum {
|
||||
shaSuccess = 0,
|
||||
shaNull, /* Null pointer parameter */
|
||||
shaInputTooLong, /* input data too long */
|
||||
shaStateError, /* called Input after FinalBits or Result */
|
||||
shaBadParam /* passed a bad parameter */
|
||||
};
|
||||
#endif /* _SHA_enum_ */
|
||||
|
||||
/*
|
||||
* These constants hold size information for each of the SHA
|
||||
* hashing operations
|
||||
*/
|
||||
enum {
|
||||
SHA1_Message_Block_Size = 64, SHA224_Message_Block_Size = 64,
|
||||
SHA256_Message_Block_Size = 64,
|
||||
USHA_Max_Message_Block_Size = SHA256_Message_Block_Size,
|
||||
|
||||
SHA1HashSize = 20, SHA224HashSize = 28, SHA256HashSize = 32,
|
||||
USHAMaxHashSize = SHA256HashSize,
|
||||
|
||||
SHA1HashSizeBits = 160, SHA224HashSizeBits = 224,
|
||||
SHA256HashSizeBits = 256, USHAMaxHashSizeBits = SHA256HashSizeBits
|
||||
};
|
||||
|
||||
/*
|
||||
* These constants are used in the USHA (Unified SHA) functions.
|
||||
*/
|
||||
typedef enum SHAversion {
|
||||
SHA224, SHA256
|
||||
} SHAversion;
|
||||
|
||||
/*
|
||||
* This structure will hold context information for the SHA-256
|
||||
* hashing operation.
|
||||
*/
|
||||
typedef struct SHA256Context {
|
||||
uint32_t Intermediate_Hash[SHA256HashSize/4]; /* Message Digest */
|
||||
|
||||
uint32_t Length_High; /* Message length in bits */
|
||||
uint32_t Length_Low; /* Message length in bits */
|
||||
|
||||
int_least16_t Message_Block_Index; /* Message_Block array index */
|
||||
/* 512-bit message blocks */
|
||||
uint8_t Message_Block[SHA256_Message_Block_Size];
|
||||
|
||||
int Computed; /* Is the hash computed? */
|
||||
int Corrupted; /* Cumulative corruption code */
|
||||
} SHA256Context;
|
||||
|
||||
/*
|
||||
* This structure will hold context information for the SHA-224
|
||||
* hashing operation. It uses the SHA-256 structure for computation.
|
||||
*/
|
||||
typedef struct SHA256Context SHA224Context;
|
||||
|
||||
/*
|
||||
* This structure holds context information for all SHA
|
||||
* hashing operations.
|
||||
*/
|
||||
typedef struct USHAContext {
|
||||
int whichSha; /* which SHA is being used */
|
||||
union {
|
||||
SHA224Context sha224Context; SHA256Context sha256Context;
|
||||
} ctx;
|
||||
|
||||
} USHAContext;
|
||||
|
||||
/*
|
||||
* This structure will hold context information for the HMAC
|
||||
* keyed-hashing operation.
|
||||
*/
|
||||
typedef struct HMACContext {
|
||||
int whichSha; /* which SHA is being used */
|
||||
int hashSize; /* hash size of SHA being used */
|
||||
int blockSize; /* block size of SHA being used */
|
||||
USHAContext shaContext; /* SHA context */
|
||||
unsigned char k_opad[USHA_Max_Message_Block_Size];
|
||||
/* outer padding - key XORd with opad */
|
||||
int Computed; /* Is the MAC computed? */
|
||||
int Corrupted; /* Cumulative corruption code */
|
||||
|
||||
} HMACContext;
|
||||
|
||||
/*
|
||||
* This structure will hold context information for the HKDF
|
||||
* extract-and-expand Key Derivation Functions.
|
||||
*/
|
||||
typedef struct HKDFContext {
|
||||
int whichSha; /* which SHA is being used */
|
||||
HMACContext hmacContext;
|
||||
int hashSize; /* hash size of SHA being used */
|
||||
unsigned char prk[USHAMaxHashSize];
|
||||
/* pseudo-random key - output of hkdfInput */
|
||||
int Computed; /* Is the key material computed? */
|
||||
int Corrupted; /* Cumulative corruption code */
|
||||
} HKDFContext;
|
||||
|
||||
/*
|
||||
* Function Prototypes
|
||||
*/
|
||||
|
||||
|
||||
/* SHA-224 */
|
||||
int SHA224Reset(SHA224Context *);
|
||||
int SHA224Input(SHA224Context *, const uint8_t *bytes,
|
||||
unsigned int bytecount);
|
||||
int SHA224FinalBits(SHA224Context *, uint8_t bits,
|
||||
unsigned int bit_count);
|
||||
int SHA224Result(SHA224Context *,
|
||||
uint8_t Message_Digest[SHA224HashSize]);
|
||||
|
||||
/* SHA-256 */
|
||||
int SHA256Reset(SHA256Context *);
|
||||
int SHA256Input(SHA256Context *, const uint8_t *bytes,
|
||||
unsigned int bytecount);
|
||||
int SHA256FinalBits(SHA256Context *, uint8_t bits,
|
||||
unsigned int bit_count);
|
||||
int SHA256Result(SHA256Context *,
|
||||
uint8_t Message_Digest[SHA256HashSize]);
|
||||
|
||||
/* Unified SHA functions, chosen by whichSha */
|
||||
int USHAReset(USHAContext *context, SHAversion whichSha);
|
||||
int USHAInput(USHAContext *context,
|
||||
const uint8_t *bytes, unsigned int bytecount);
|
||||
int USHAFinalBits(USHAContext *context,
|
||||
uint8_t bits, unsigned int bit_count);
|
||||
int USHAResult(USHAContext *context,
|
||||
uint8_t Message_Digest[USHAMaxHashSize]);
|
||||
int USHABlockSize(enum SHAversion whichSha);
|
||||
int USHAHashSize(enum SHAversion whichSha);
|
||||
|
||||
/*
|
||||
* HMAC Keyed-Hashing for Message Authentication, RFC 2104,
|
||||
* for all SHAs.
|
||||
* This interface allows a fixed-length text input to be used.
|
||||
*/
|
||||
int hmac(SHAversion whichSha, /* which SHA algorithm to use */
|
||||
const unsigned char *text, /* pointer to data stream */
|
||||
size_t text_len, /* length of data stream */
|
||||
const unsigned char *key, /* pointer to authentication key */
|
||||
size_t key_len, /* length of authentication key */
|
||||
uint8_t digest[USHAMaxHashSize]); /* caller digest to fill in */
|
||||
|
||||
/*
|
||||
* HMAC Keyed-Hashing for Message Authentication, RFC 2104,
|
||||
* for all SHAs.
|
||||
* This interface allows any length of text input to be used.
|
||||
*/
|
||||
int hmacReset(HMACContext *context, enum SHAversion whichSha,
|
||||
const unsigned char *key, size_t key_len);
|
||||
int hmacInput(HMACContext *context, const unsigned char *text,
|
||||
size_t text_len);
|
||||
int hmacFinalBits(HMACContext *context, uint8_t bits,
|
||||
unsigned int bit_count);
|
||||
int hmacResult(HMACContext *context,
|
||||
uint8_t digest[USHAMaxHashSize]);
|
||||
|
||||
|
||||
/*
|
||||
* HKDF HMAC-based Extract-and-Expand Key Derivation Function,
|
||||
* RFC 5869, for all SHAs.
|
||||
*/
|
||||
int hkdf(SHAversion whichSha,
|
||||
const unsigned char *salt, size_t salt_len,
|
||||
const unsigned char *ikm, size_t ikm_len,
|
||||
const unsigned char *info, size_t info_len,
|
||||
uint8_t okm[ ], size_t okm_len);
|
||||
|
||||
int hkdfExtract(SHAversion whichSha, const unsigned char *salt,
|
||||
size_t salt_len, const unsigned char *ikm,
|
||||
size_t ikm_len, uint8_t prk[USHAMaxHashSize]);
|
||||
int hkdfExpand(SHAversion whichSha, const uint8_t prk[ ],
|
||||
size_t prk_len, const unsigned char *info,
|
||||
size_t info_len, uint8_t okm[ ], size_t okm_len);
|
||||
|
||||
/*
|
||||
* HKDF HMAC-based Extract-and-Expand Key Derivation Function,
|
||||
* RFC 5869, for all SHAs.
|
||||
* This interface allows any length of text input to be used.
|
||||
*/
|
||||
int hkdfReset(HKDFContext *context, enum SHAversion whichSha,
|
||||
const unsigned char *salt, size_t salt_len);
|
||||
int hkdfInput(HKDFContext *context, const unsigned char *ikm,
|
||||
size_t ikm_len);
|
||||
int hkdfFinalBits(HKDFContext *context, uint8_t ikm_bits,
|
||||
unsigned int ikm_bit_count);
|
||||
int hkdfResult(HKDFContext *context,
|
||||
uint8_t prk[USHAMaxHashSize],
|
||||
const unsigned char *info, size_t info_len,
|
||||
uint8_t okm[USHAMaxHashSize], size_t okm_len);
|
||||
581
nfq/crypto/sha224-256.c
Normal file
581
nfq/crypto/sha224-256.c
Normal file
@ -0,0 +1,581 @@
|
||||
/************************* sha224-256.c ************************/
|
||||
/***************** See RFC 6234 for details. *******************/
|
||||
/* Copyright (c) 2011 IETF Trust and the persons identified as */
|
||||
/* authors of the code. All rights reserved. */
|
||||
/* See sha.h for terms of use and redistribution. */
|
||||
|
||||
/*
|
||||
* Description:
|
||||
* This file implements the Secure Hash Algorithms SHA-224 and
|
||||
* SHA-256 as defined in the U.S. National Institute of Standards
|
||||
* and Technology Federal Information Processing Standards
|
||||
* Publication (FIPS PUB) 180-3 published in October 2008
|
||||
* and formerly defined in its predecessors, FIPS PUB 180-1
|
||||
* and FIP PUB 180-2.
|
||||
*
|
||||
* A combined document showing all algorithms is available at
|
||||
* http://csrc.nist.gov/publications/fips/
|
||||
* fips180-3/fips180-3_final.pdf
|
||||
*
|
||||
* The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
|
||||
* message digests for a given data stream. It should take about
|
||||
* 2**n steps to find a message with the same digest as a given
|
||||
* message and 2**(n/2) to find any two messages with the same
|
||||
* digest, when n is the digest size in bits. Therefore, this
|
||||
* algorithm can serve as a means of providing a
|
||||
* "fingerprint" for a message.
|
||||
*
|
||||
* Portability Issues:
|
||||
* SHA-224 and SHA-256 are defined in terms of 32-bit "words".
|
||||
* This code uses <stdint.h> (included via "sha.h") to define 32-
|
||||
* and 8-bit unsigned integer types. If your C compiler does not
|
||||
* support 32-bit unsigned integers, this code is not
|
||||
* appropriate.
|
||||
*
|
||||
* Caveats:
|
||||
* SHA-224 and SHA-256 are designed to work with messages less
|
||||
* than 2^64 bits long. This implementation uses SHA224/256Input()
|
||||
* to hash the bits that are a multiple of the size of an 8-bit
|
||||
* octet, and then optionally uses SHA224/256FinalBits()
|
||||
* to hash the final few bits of the input.
|
||||
*/
|
||||
|
||||
#include "sha.h"
|
||||
#include "sha-private.h"
|
||||
|
||||
/* Define the SHA shift, rotate left, and rotate right macros */
|
||||
#define SHA256_SHR(bits,word) ((word) >> (bits))
|
||||
#define SHA256_ROTL(bits,word) \
|
||||
(((word) << (bits)) | ((word) >> (32-(bits))))
|
||||
#define SHA256_ROTR(bits,word) \
|
||||
(((word) >> (bits)) | ((word) << (32-(bits))))
|
||||
|
||||
/* Define the SHA SIGMA and sigma macros */
|
||||
#define SHA256_SIGMA0(word) \
|
||||
(SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word))
|
||||
#define SHA256_SIGMA1(word) \
|
||||
(SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word))
|
||||
#define SHA256_sigma0(word) \
|
||||
(SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word))
|
||||
#define SHA256_sigma1(word) \
|
||||
(SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word))
|
||||
|
||||
/*
|
||||
* Add "length" to the length.
|
||||
* Set Corrupted when overflow has occurred.
|
||||
*/
|
||||
static uint32_t addTemp;
|
||||
#define SHA224_256AddLength(context, length) \
|
||||
(addTemp = (context)->Length_Low, (context)->Corrupted = \
|
||||
(((context)->Length_Low += (length)) < addTemp) && \
|
||||
(++(context)->Length_High == 0) ? shaInputTooLong : \
|
||||
(context)->Corrupted )
|
||||
|
||||
/* Local Function Prototypes */
|
||||
static int SHA224_256Reset(SHA256Context *context, uint32_t *H0);
|
||||
static void SHA224_256ProcessMessageBlock(SHA256Context *context);
|
||||
static void SHA224_256Finalize(SHA256Context *context,
|
||||
uint8_t Pad_Byte);
|
||||
static void SHA224_256PadMessage(SHA256Context *context,
|
||||
uint8_t Pad_Byte);
|
||||
static int SHA224_256ResultN(SHA256Context *context,
|
||||
uint8_t Message_Digest[ ], int HashSize);
|
||||
|
||||
/* Initial Hash Values: FIPS 180-3 section 5.3.2 */
|
||||
static uint32_t SHA224_H0[SHA256HashSize/4] = {
|
||||
0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939,
|
||||
0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4
|
||||
};
|
||||
|
||||
/* Initial Hash Values: FIPS 180-3 section 5.3.3 */
|
||||
static uint32_t SHA256_H0[SHA256HashSize/4] = {
|
||||
0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
|
||||
0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
|
||||
};
|
||||
|
||||
/*
|
||||
* SHA224Reset
|
||||
*
|
||||
* Description:
|
||||
* This function will initialize the SHA224Context in preparation
|
||||
* for computing a new SHA224 message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int SHA224Reset(SHA224Context *context)
|
||||
{
|
||||
return SHA224_256Reset(context, SHA224_H0);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224Input
|
||||
*
|
||||
* Description:
|
||||
* This function accepts an array of octets as the next portion
|
||||
* of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* message_array[ ]: [in]
|
||||
* An array of octets representing the next portion of
|
||||
* the message.
|
||||
* length: [in]
|
||||
* The length of the message in message_array.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int SHA224Input(SHA224Context *context, const uint8_t *message_array,
|
||||
unsigned int length)
|
||||
{
|
||||
return SHA256Input(context, message_array, length);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224FinalBits
|
||||
*
|
||||
* Description:
|
||||
* This function will add in any final bits of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* message_bits: [in]
|
||||
* The final bits of the message, in the upper portion of the
|
||||
* byte. (Use 0b###00000 instead of 0b00000### to input the
|
||||
* three bits ###.)
|
||||
* length: [in]
|
||||
* The number of bits in message_bits, between 1 and 7.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int SHA224FinalBits(SHA224Context *context,
|
||||
uint8_t message_bits, unsigned int length)
|
||||
{
|
||||
return SHA256FinalBits(context, message_bits, length);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224Result
|
||||
*
|
||||
* Description:
|
||||
* This function will return the 224-bit message digest
|
||||
* into the Message_Digest array provided by the caller.
|
||||
* NOTE:
|
||||
* The first octet of hash is stored in the element with index 0,
|
||||
* the last octet of hash in the element with index 27.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to use to calculate the SHA hash.
|
||||
* Message_Digest[ ]: [out]
|
||||
* Where the digest is returned.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int SHA224Result(SHA224Context *context,
|
||||
uint8_t Message_Digest[SHA224HashSize])
|
||||
{
|
||||
return SHA224_256ResultN(context, Message_Digest, SHA224HashSize);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA256Reset
|
||||
*
|
||||
* Description:
|
||||
* This function will initialize the SHA256Context in preparation
|
||||
* for computing a new SHA256 message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int SHA256Reset(SHA256Context *context)
|
||||
{
|
||||
return SHA224_256Reset(context, SHA256_H0);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA256Input
|
||||
*
|
||||
* Description:
|
||||
* This function accepts an array of octets as the next portion
|
||||
* of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* message_array[ ]: [in]
|
||||
* An array of octets representing the next portion of
|
||||
* the message.
|
||||
* length: [in]
|
||||
* The length of the message in message_array.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int SHA256Input(SHA256Context *context, const uint8_t *message_array,
|
||||
unsigned int length)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
if (!length) return shaSuccess;
|
||||
if (!message_array) return shaNull;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
|
||||
while (length--) {
|
||||
context->Message_Block[context->Message_Block_Index++] =
|
||||
*message_array;
|
||||
|
||||
if ((SHA224_256AddLength(context, 8) == shaSuccess) &&
|
||||
(context->Message_Block_Index == SHA256_Message_Block_Size))
|
||||
SHA224_256ProcessMessageBlock(context);
|
||||
|
||||
message_array++;
|
||||
}
|
||||
|
||||
return context->Corrupted;
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA256FinalBits
|
||||
*
|
||||
* Description:
|
||||
* This function will add in any final bits of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* message_bits: [in]
|
||||
* The final bits of the message, in the upper portion of the
|
||||
* byte. (Use 0b###00000 instead of 0b00000### to input the
|
||||
* three bits ###.)
|
||||
* length: [in]
|
||||
* The number of bits in message_bits, between 1 and 7.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int SHA256FinalBits(SHA256Context *context,
|
||||
uint8_t message_bits, unsigned int length)
|
||||
{
|
||||
static uint8_t masks[8] = {
|
||||
/* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
|
||||
/* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
|
||||
/* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
|
||||
/* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
|
||||
};
|
||||
static uint8_t markbit[8] = {
|
||||
/* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
|
||||
/* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
|
||||
/* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
|
||||
/* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
|
||||
};
|
||||
|
||||
if (!context) return shaNull;
|
||||
if (!length) return shaSuccess;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
if (context->Computed) return context->Corrupted = shaStateError;
|
||||
if (length >= 8) return context->Corrupted = shaBadParam;
|
||||
|
||||
SHA224_256AddLength(context, length);
|
||||
SHA224_256Finalize(context, (uint8_t)
|
||||
((message_bits & masks[length]) | markbit[length]));
|
||||
|
||||
return context->Corrupted;
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA256Result
|
||||
*
|
||||
* Description:
|
||||
* This function will return the 256-bit message digest
|
||||
* into the Message_Digest array provided by the caller.
|
||||
* NOTE:
|
||||
* The first octet of hash is stored in the element with index 0,
|
||||
* the last octet of hash in the element with index 31.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to use to calculate the SHA hash.
|
||||
* Message_Digest[ ]: [out]
|
||||
* Where the digest is returned.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int SHA256Result(SHA256Context *context,
|
||||
uint8_t Message_Digest[SHA256HashSize])
|
||||
{
|
||||
return SHA224_256ResultN(context, Message_Digest, SHA256HashSize);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256Reset
|
||||
*
|
||||
* Description:
|
||||
* This helper function will initialize the SHA256Context in
|
||||
* preparation for computing a new SHA-224 or SHA-256 message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
* H0[ ]: [in]
|
||||
* The initial hash value array to use.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
static int SHA224_256Reset(SHA256Context *context, uint32_t *H0)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
|
||||
context->Length_High = context->Length_Low = 0;
|
||||
context->Message_Block_Index = 0;
|
||||
|
||||
context->Intermediate_Hash[0] = H0[0];
|
||||
context->Intermediate_Hash[1] = H0[1];
|
||||
context->Intermediate_Hash[2] = H0[2];
|
||||
context->Intermediate_Hash[3] = H0[3];
|
||||
context->Intermediate_Hash[4] = H0[4];
|
||||
context->Intermediate_Hash[5] = H0[5];
|
||||
context->Intermediate_Hash[6] = H0[6];
|
||||
context->Intermediate_Hash[7] = H0[7];
|
||||
|
||||
context->Computed = 0;
|
||||
context->Corrupted = shaSuccess;
|
||||
|
||||
return shaSuccess;
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256ProcessMessageBlock
|
||||
*
|
||||
* Description:
|
||||
* This helper function will process the next 512 bits of the
|
||||
* message stored in the Message_Block array.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
*
|
||||
* Returns:
|
||||
* Nothing.
|
||||
*
|
||||
* Comments:
|
||||
* Many of the variable names in this code, especially the
|
||||
* single character names, were used because those were the
|
||||
* names used in the Secure Hash Standard.
|
||||
*/
|
||||
static void SHA224_256ProcessMessageBlock(SHA256Context *context)
|
||||
{
|
||||
/* Constants defined in FIPS 180-3, section 4.2.2 */
|
||||
static const uint32_t K[64] = {
|
||||
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
|
||||
0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
|
||||
0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
|
||||
0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
|
||||
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
|
||||
0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
|
||||
0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
|
||||
0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
|
||||
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
|
||||
0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
|
||||
0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
|
||||
0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
|
||||
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
|
||||
};
|
||||
int t, t4; /* Loop counter */
|
||||
uint32_t temp1, temp2; /* Temporary word value */
|
||||
uint32_t W[64]; /* Word sequence */
|
||||
uint32_t A, B, C, D, E, F, G, H; /* Word buffers */
|
||||
|
||||
/*
|
||||
* Initialize the first 16 words in the array W
|
||||
*/
|
||||
for (t = t4 = 0; t < 16; t++, t4 += 4)
|
||||
W[t] = (((uint32_t)context->Message_Block[t4]) << 24) |
|
||||
(((uint32_t)context->Message_Block[t4 + 1]) << 16) |
|
||||
(((uint32_t)context->Message_Block[t4 + 2]) << 8) |
|
||||
(((uint32_t)context->Message_Block[t4 + 3]));
|
||||
for (t = 16; t < 64; t++)
|
||||
W[t] = SHA256_sigma1(W[t-2]) + W[t-7] +
|
||||
SHA256_sigma0(W[t-15]) + W[t-16];
|
||||
|
||||
A = context->Intermediate_Hash[0];
|
||||
B = context->Intermediate_Hash[1];
|
||||
C = context->Intermediate_Hash[2];
|
||||
D = context->Intermediate_Hash[3];
|
||||
E = context->Intermediate_Hash[4];
|
||||
F = context->Intermediate_Hash[5];
|
||||
G = context->Intermediate_Hash[6];
|
||||
H = context->Intermediate_Hash[7];
|
||||
|
||||
for (t = 0; t < 64; t++) {
|
||||
temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t];
|
||||
temp2 = SHA256_SIGMA0(A) + SHA_Maj(A,B,C);
|
||||
H = G;
|
||||
G = F;
|
||||
F = E;
|
||||
E = D + temp1;
|
||||
D = C;
|
||||
C = B;
|
||||
B = A;
|
||||
A = temp1 + temp2;
|
||||
}
|
||||
|
||||
context->Intermediate_Hash[0] += A;
|
||||
context->Intermediate_Hash[1] += B;
|
||||
context->Intermediate_Hash[2] += C;
|
||||
context->Intermediate_Hash[3] += D;
|
||||
context->Intermediate_Hash[4] += E;
|
||||
context->Intermediate_Hash[5] += F;
|
||||
context->Intermediate_Hash[6] += G;
|
||||
context->Intermediate_Hash[7] += H;
|
||||
|
||||
context->Message_Block_Index = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256Finalize
|
||||
*
|
||||
* Description:
|
||||
* This helper function finishes off the digest calculations.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* Pad_Byte: [in]
|
||||
* The last byte to add to the message block before the 0-padding
|
||||
* and length. This will contain the last bits of the message
|
||||
* followed by another single bit. If the message was an
|
||||
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
static void SHA224_256Finalize(SHA256Context *context,
|
||||
uint8_t Pad_Byte)
|
||||
{
|
||||
int i;
|
||||
SHA224_256PadMessage(context, Pad_Byte);
|
||||
/* message may be sensitive, so clear it out */
|
||||
for (i = 0; i < SHA256_Message_Block_Size; ++i)
|
||||
context->Message_Block[i] = 0;
|
||||
context->Length_High = 0; /* and clear length */
|
||||
context->Length_Low = 0;
|
||||
context->Computed = 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256PadMessage
|
||||
*
|
||||
* Description:
|
||||
* According to the standard, the message must be padded to the next
|
||||
* even multiple of 512 bits. The first padding bit must be a '1'.
|
||||
* The last 64 bits represent the length of the original message.
|
||||
* All bits in between should be 0. This helper function will pad
|
||||
* the message according to those rules by filling the
|
||||
* Message_Block array accordingly. When it returns, it can be
|
||||
* assumed that the message digest has been computed.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to pad.
|
||||
* Pad_Byte: [in]
|
||||
* The last byte to add to the message block before the 0-padding
|
||||
* and length. This will contain the last bits of the message
|
||||
* followed by another single bit. If the message was an
|
||||
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
|
||||
*
|
||||
* Returns:
|
||||
* Nothing.
|
||||
*/
|
||||
static void SHA224_256PadMessage(SHA256Context *context,
|
||||
uint8_t Pad_Byte)
|
||||
{
|
||||
/*
|
||||
* Check to see if the current message block is too small to hold
|
||||
* the initial padding bits and length. If so, we will pad the
|
||||
* block, process it, and then continue padding into a second
|
||||
* block.
|
||||
*/
|
||||
if (context->Message_Block_Index >= (SHA256_Message_Block_Size-8)) {
|
||||
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
|
||||
while (context->Message_Block_Index < SHA256_Message_Block_Size)
|
||||
context->Message_Block[context->Message_Block_Index++] = 0;
|
||||
SHA224_256ProcessMessageBlock(context);
|
||||
} else
|
||||
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
|
||||
|
||||
while (context->Message_Block_Index < (SHA256_Message_Block_Size-8))
|
||||
context->Message_Block[context->Message_Block_Index++] = 0;
|
||||
|
||||
/*
|
||||
* Store the message length as the last 8 octets
|
||||
*/
|
||||
context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
|
||||
context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
|
||||
context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
|
||||
context->Message_Block[59] = (uint8_t)(context->Length_High);
|
||||
context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
|
||||
context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
|
||||
context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
|
||||
context->Message_Block[63] = (uint8_t)(context->Length_Low);
|
||||
|
||||
SHA224_256ProcessMessageBlock(context);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256ResultN
|
||||
*
|
||||
* Description:
|
||||
* This helper function will return the 224-bit or 256-bit message
|
||||
* digest into the Message_Digest array provided by the caller.
|
||||
* NOTE:
|
||||
* The first octet of hash is stored in the element with index 0,
|
||||
* the last octet of hash in the element with index 27/31.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to use to calculate the SHA hash.
|
||||
* Message_Digest[ ]: [out]
|
||||
* Where the digest is returned.
|
||||
* HashSize: [in]
|
||||
* The size of the hash, either 28 or 32.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
static int SHA224_256ResultN(SHA256Context *context,
|
||||
uint8_t Message_Digest[ ], int HashSize)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (!context) return shaNull;
|
||||
if (!Message_Digest) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
|
||||
if (!context->Computed)
|
||||
SHA224_256Finalize(context, 0x80);
|
||||
|
||||
for (i = 0; i < HashSize; ++i)
|
||||
Message_Digest[i] = (uint8_t)
|
||||
(context->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) ));
|
||||
|
||||
return shaSuccess;
|
||||
}
|
||||
|
||||
191
nfq/crypto/usha.c
Normal file
191
nfq/crypto/usha.c
Normal file
@ -0,0 +1,191 @@
|
||||
/**************************** usha.c ***************************/
|
||||
/***************** See RFC 6234 for details. *******************/
|
||||
/* Copyright (c) 2011 IETF Trust and the persons identified as */
|
||||
/* authors of the code. All rights reserved. */
|
||||
/* See sha.h for terms of use and redistribution. */
|
||||
|
||||
/*
|
||||
* Description:
|
||||
* This file implements a unified interface to the SHA algorithms.
|
||||
*/
|
||||
|
||||
#include "sha.h"
|
||||
|
||||
/*
|
||||
* USHAReset
|
||||
*
|
||||
* Description:
|
||||
* This function will initialize the SHA Context in preparation
|
||||
* for computing a new SHA message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
* whichSha: [in]
|
||||
* Selects which SHA reset to call
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int USHAReset(USHAContext *context, enum SHAversion whichSha)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
context->whichSha = whichSha;
|
||||
switch (whichSha) {
|
||||
case SHA224: return SHA224Reset((SHA224Context*)&context->ctx);
|
||||
case SHA256: return SHA256Reset((SHA256Context*)&context->ctx);
|
||||
default: return shaBadParam;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* USHAInput
|
||||
*
|
||||
* Description:
|
||||
* This function accepts an array of octets as the next portion
|
||||
* of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* message_array: [in]
|
||||
* An array of octets representing the next portion of
|
||||
* the message.
|
||||
* length: [in]
|
||||
* The length of the message in message_array.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int USHAInput(USHAContext *context,
|
||||
const uint8_t *bytes, unsigned int bytecount)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
switch (context->whichSha) {
|
||||
case SHA224:
|
||||
return SHA224Input((SHA224Context*)&context->ctx, bytes,
|
||||
bytecount);
|
||||
case SHA256:
|
||||
return SHA256Input((SHA256Context*)&context->ctx, bytes,
|
||||
bytecount);
|
||||
default: return shaBadParam;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* USHAFinalBits
|
||||
*
|
||||
* Description:
|
||||
* This function will add in any final bits of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* message_bits: [in]
|
||||
* The final bits of the message, in the upper portion of the
|
||||
* byte. (Use 0b###00000 instead of 0b00000### to input the
|
||||
* three bits ###.)
|
||||
* length: [in]
|
||||
* The number of bits in message_bits, between 1 and 7.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
int USHAFinalBits(USHAContext *context,
|
||||
uint8_t bits, unsigned int bit_count)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
switch (context->whichSha) {
|
||||
case SHA224:
|
||||
return SHA224FinalBits((SHA224Context*)&context->ctx, bits,
|
||||
bit_count);
|
||||
case SHA256:
|
||||
return SHA256FinalBits((SHA256Context*)&context->ctx, bits,
|
||||
bit_count);
|
||||
default: return shaBadParam;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* USHAResult
|
||||
*
|
||||
* Description:
|
||||
* This function will return the message digest of the appropriate
|
||||
* bit size, as returned by USHAHashSizeBits(whichSHA) for the
|
||||
* 'whichSHA' value used in the preceeding call to USHAReset,
|
||||
* into the Message_Digest array provided by the caller.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to use to calculate the SHA-1 hash.
|
||||
* Message_Digest: [out]
|
||||
* Where the digest is returned.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*
|
||||
*/
|
||||
int USHAResult(USHAContext *context,
|
||||
uint8_t Message_Digest[USHAMaxHashSize])
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
switch (context->whichSha) {
|
||||
case SHA224:
|
||||
return SHA224Result((SHA224Context*)&context->ctx,
|
||||
Message_Digest);
|
||||
case SHA256:
|
||||
return SHA256Result((SHA256Context*)&context->ctx,
|
||||
Message_Digest);
|
||||
default: return shaBadParam;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* USHABlockSize
|
||||
*
|
||||
* Description:
|
||||
* This function will return the blocksize for the given SHA
|
||||
* algorithm.
|
||||
*
|
||||
* Parameters:
|
||||
* whichSha:
|
||||
* which SHA algorithm to query
|
||||
*
|
||||
* Returns:
|
||||
* block size
|
||||
*
|
||||
*/
|
||||
int USHABlockSize(enum SHAversion whichSha)
|
||||
{
|
||||
switch (whichSha) {
|
||||
case SHA224: return SHA224_Message_Block_Size;
|
||||
default:
|
||||
case SHA256: return SHA256_Message_Block_Size;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* USHAHashSize
|
||||
*
|
||||
* Description:
|
||||
* This function will return the hashsize for the given SHA
|
||||
* algorithm.
|
||||
*
|
||||
* Parameters:
|
||||
* whichSha:
|
||||
* which SHA algorithm to query
|
||||
*
|
||||
* Returns:
|
||||
* hash size
|
||||
*
|
||||
*/
|
||||
int USHAHashSize(enum SHAversion whichSha)
|
||||
{
|
||||
switch (whichSha) {
|
||||
case SHA224: return SHA224HashSize;
|
||||
default:
|
||||
case SHA256: return SHA256HashSize;
|
||||
}
|
||||
}
|
||||
35
nfq/desync.c
35
nfq/desync.c
@ -655,12 +655,37 @@ packet_process_result dpi_desync_udp_packet(uint8_t *data_pkt, size_t len_pkt, s
|
||||
const uint8_t *fake;
|
||||
size_t fake_size;
|
||||
bool b;
|
||||
char host[256];
|
||||
bool bHaveHost=false;
|
||||
|
||||
if (IsQUICInitial(data_payload,len_payload))
|
||||
{
|
||||
DLOG("packet contains QUIC initial\n")
|
||||
fake = params.fake_quic;
|
||||
fake_size = params.fake_quic_size;
|
||||
|
||||
bool bIsCryptoHello;
|
||||
bHaveHost=QUICExtractHostFromInitial(data_payload,len_payload,host,sizeof(host),&bIsCryptoHello);
|
||||
if (bIsCryptoHello)
|
||||
{
|
||||
if (params.desync_skip_nosni && !bHaveHost)
|
||||
{
|
||||
DLOG("not applying tampering to QUIC ClientHello without hostname in the SNI\n")
|
||||
return res;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (params.desync_any_proto)
|
||||
{
|
||||
DLOG("QUIC initial without CRYPTO frame. applying tampering because desync_any_proto is set\n")
|
||||
}
|
||||
else
|
||||
{
|
||||
DLOG("not applying tampering to QUIC initial without CRYPTO frame\n")
|
||||
return res;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -670,6 +695,16 @@ packet_process_result dpi_desync_udp_packet(uint8_t *data_pkt, size_t len_pkt, s
|
||||
fake_size = params.fake_unknown_udp_size;
|
||||
}
|
||||
|
||||
if (bHaveHost)
|
||||
{
|
||||
DLOG("hostname: %s\n",host)
|
||||
if (params.hostlist && !SearchHostList(params.hostlist,host,params.debug))
|
||||
{
|
||||
DLOG("not applying tampering to this request\n")
|
||||
return res;
|
||||
}
|
||||
}
|
||||
|
||||
enum dpi_desync_mode desync_mode = params.desync_mode;
|
||||
uint8_t fooling_orig = FOOL_NONE;
|
||||
|
||||
|
||||
@ -9,20 +9,20 @@
|
||||
void hexdump_limited_dlog(const uint8_t *data, size_t size, size_t limit)
|
||||
{
|
||||
size_t k;
|
||||
bool bcut=false;
|
||||
if (size>limit)
|
||||
bool bcut = false;
|
||||
if (size > limit)
|
||||
{
|
||||
size=limit;
|
||||
size = limit;
|
||||
bcut = true;
|
||||
}
|
||||
if (!size) return;
|
||||
for (k=0;k<size;k++) DLOG("%02X ",data[k]);
|
||||
for (k = 0; k < size; k++) DLOG("%02X ", data[k]);
|
||||
DLOG(bcut ? "... : " : ": ");
|
||||
for (k=0;k<size;k++) DLOG("%c",data[k]>=0x20 && data[k]<=0x7F ? (char)data[k] : '.');
|
||||
for (k = 0; k < size; k++) DLOG("%c", data[k] >= 0x20 && data[k] <= 0x7F ? (char)data[k] : '.');
|
||||
if (bcut) DLOG(" ...");
|
||||
}
|
||||
|
||||
char *strncasestr(const char *s,const char *find, size_t slen)
|
||||
char *strncasestr(const char *s, const char *find, size_t slen)
|
||||
{
|
||||
char c, sc;
|
||||
size_t len;
|
||||
@ -43,14 +43,14 @@ char *strncasestr(const char *s,const char *find, size_t slen)
|
||||
return (char *)s;
|
||||
}
|
||||
|
||||
bool load_file(const char *filename,void *buffer,size_t *buffer_size)
|
||||
bool load_file(const char *filename, void *buffer, size_t *buffer_size)
|
||||
{
|
||||
FILE *F;
|
||||
|
||||
F = fopen(filename,"rb");
|
||||
F = fopen(filename, "rb");
|
||||
if (!F) return false;
|
||||
|
||||
*buffer_size = fread(buffer,1,*buffer_size,F);
|
||||
*buffer_size = fread(buffer, 1, *buffer_size, F);
|
||||
if (ferror(F))
|
||||
{
|
||||
fclose(F);
|
||||
@ -60,18 +60,34 @@ bool load_file(const char *filename,void *buffer,size_t *buffer_size)
|
||||
fclose(F);
|
||||
return true;
|
||||
}
|
||||
bool load_file_nonempty(const char *filename,void *buffer,size_t *buffer_size)
|
||||
bool load_file_nonempty(const char *filename, void *buffer, size_t *buffer_size)
|
||||
{
|
||||
bool b = load_file(filename,buffer,buffer_size);
|
||||
bool b = load_file(filename, buffer, buffer_size);
|
||||
return b && *buffer_size;
|
||||
}
|
||||
bool save_file(const char *filename, const void *buffer, size_t buffer_size)
|
||||
{
|
||||
FILE *F;
|
||||
|
||||
F = fopen(filename, "wb");
|
||||
if (!F) return false;
|
||||
|
||||
fwrite(buffer, 1, buffer_size, F);
|
||||
if (ferror(F))
|
||||
{
|
||||
fclose(F);
|
||||
return false;
|
||||
}
|
||||
|
||||
fclose(F);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
void ntop46(const struct sockaddr *sa, char *str, size_t len)
|
||||
{
|
||||
if (!len) return;
|
||||
*str=0;
|
||||
*str = 0;
|
||||
switch (sa->sa_family)
|
||||
{
|
||||
case AF_INET:
|
||||
@ -81,31 +97,31 @@ void ntop46(const struct sockaddr *sa, char *str, size_t len)
|
||||
inet_ntop(sa->sa_family, &((struct sockaddr_in6*)sa)->sin6_addr, str, len);
|
||||
break;
|
||||
default:
|
||||
snprintf(str,len,"UNKNOWN_FAMILY_%d",sa->sa_family);
|
||||
snprintf(str, len, "UNKNOWN_FAMILY_%d", sa->sa_family);
|
||||
}
|
||||
}
|
||||
void ntop46_port(const struct sockaddr *sa, char *str, size_t len)
|
||||
{
|
||||
char ip[40];
|
||||
ntop46(sa,ip,sizeof(ip));
|
||||
ntop46(sa, ip, sizeof(ip));
|
||||
switch (sa->sa_family)
|
||||
{
|
||||
case AF_INET:
|
||||
snprintf(str,len,"%s:%u",ip,ntohs(((struct sockaddr_in*)sa)->sin_port));
|
||||
snprintf(str, len, "%s:%u", ip, ntohs(((struct sockaddr_in*)sa)->sin_port));
|
||||
break;
|
||||
case AF_INET6:
|
||||
snprintf(str,len,"[%s]:%u",ip,ntohs(((struct sockaddr_in6*)sa)->sin6_port));
|
||||
snprintf(str, len, "[%s]:%u", ip, ntohs(((struct sockaddr_in6*)sa)->sin6_port));
|
||||
break;
|
||||
default:
|
||||
snprintf(str,len,"%s",ip);
|
||||
snprintf(str, len, "%s", ip);
|
||||
}
|
||||
}
|
||||
void print_sockaddr(const struct sockaddr *sa)
|
||||
{
|
||||
char ip_port[48];
|
||||
|
||||
ntop46_port(sa,ip_port,sizeof(ip_port));
|
||||
printf("%s",ip_port);
|
||||
ntop46_port(sa, ip_port, sizeof(ip_port));
|
||||
printf("%s", ip_port);
|
||||
}
|
||||
|
||||
void dbgprint_socket_buffers(int fd)
|
||||
@ -114,24 +130,24 @@ void dbgprint_socket_buffers(int fd)
|
||||
{
|
||||
int v;
|
||||
socklen_t sz;
|
||||
sz=sizeof(int);
|
||||
if (!getsockopt(fd,SOL_SOCKET,SO_RCVBUF,&v,&sz))
|
||||
DLOG("fd=%d SO_RCVBUF=%d\n",fd,v)
|
||||
sz=sizeof(int);
|
||||
if (!getsockopt(fd,SOL_SOCKET,SO_SNDBUF,&v,&sz))
|
||||
DLOG("fd=%d SO_SNDBUF=%d\n",fd,v)
|
||||
sz = sizeof(int);
|
||||
if (!getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &v, &sz))
|
||||
DLOG("fd=%d SO_RCVBUF=%d\n", fd, v)
|
||||
sz = sizeof(int);
|
||||
if (!getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &v, &sz))
|
||||
DLOG("fd=%d SO_SNDBUF=%d\n", fd, v)
|
||||
}
|
||||
}
|
||||
bool set_socket_buffers(int fd, int rcvbuf, int sndbuf)
|
||||
{
|
||||
DLOG("set_socket_buffers fd=%d rcvbuf=%d sndbuf=%d\n",fd,rcvbuf,sndbuf)
|
||||
if (rcvbuf && setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(int)) <0)
|
||||
DLOG("set_socket_buffers fd=%d rcvbuf=%d sndbuf=%d\n", fd, rcvbuf, sndbuf)
|
||||
if (rcvbuf && setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(int)) < 0)
|
||||
{
|
||||
perror("setsockopt (SO_RCVBUF)");
|
||||
close(fd);
|
||||
return false;
|
||||
}
|
||||
if (sndbuf && setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(int)) <0)
|
||||
if (sndbuf && setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(int)) < 0)
|
||||
{
|
||||
perror("setsockopt (SO_SNDBUF)");
|
||||
close(fd);
|
||||
@ -140,3 +156,26 @@ bool set_socket_buffers(int fd, int rcvbuf, int sndbuf)
|
||||
dbgprint_socket_buffers(fd);
|
||||
return true;
|
||||
}
|
||||
|
||||
uint64_t pntoh64(const void *p)
|
||||
{
|
||||
return (uint64_t)*((const uint8_t *)(p)+0) << 56 |
|
||||
(uint64_t)*((const uint8_t *)(p)+1) << 48 |
|
||||
(uint64_t)*((const uint8_t *)(p)+2) << 40 |
|
||||
(uint64_t)*((const uint8_t *)(p)+3) << 32 |
|
||||
(uint64_t)*((const uint8_t *)(p)+4) << 24 |
|
||||
(uint64_t)*((const uint8_t *)(p)+5) << 16 |
|
||||
(uint64_t)*((const uint8_t *)(p)+6) << 8 |
|
||||
(uint64_t)*((const uint8_t *)(p)+7) << 0;
|
||||
}
|
||||
void phton64(uint8_t *p, uint64_t v)
|
||||
{
|
||||
p[0] = (uint8_t)(v >> 56);
|
||||
p[1] = (uint8_t)(v >> 48);
|
||||
p[2] = (uint8_t)(v >> 40);
|
||||
p[3] = (uint8_t)(v >> 32);
|
||||
p[4] = (uint8_t)(v >> 24);
|
||||
p[5] = (uint8_t)(v >> 16);
|
||||
p[6] = (uint8_t)(v >> 8);
|
||||
p[7] = (uint8_t)(v >> 0);
|
||||
}
|
||||
|
||||
@ -12,6 +12,7 @@ void hexdump_limited_dlog(const uint8_t *data, size_t size, size_t limit);
|
||||
char *strncasestr(const char *s,const char *find, size_t slen);
|
||||
bool load_file(const char *filename,void *buffer,size_t *buffer_size);
|
||||
bool load_file_nonempty(const char *filename,void *buffer,size_t *buffer_size);
|
||||
bool save_file(const char *filename, const void *buffer, size_t buffer_size);
|
||||
|
||||
void print_sockaddr(const struct sockaddr *sa);
|
||||
void ntop46(const struct sockaddr *sa, char *str, size_t len);
|
||||
@ -19,3 +20,6 @@ void ntop46_port(const struct sockaddr *sa, char *str, size_t len);
|
||||
|
||||
void dbgprint_socket_buffers(int fd);
|
||||
bool set_socket_buffers(int fd, int rcvbuf, int sndbuf);
|
||||
|
||||
uint64_t pntoh64(const void *p);
|
||||
void phton64(uint8_t *p, uint64_t v);
|
||||
|
||||
373
nfq/protocol.c
373
nfq/protocol.c
@ -43,17 +43,64 @@ bool HttpExtractHost(const uint8_t *data, size_t len, char *host, size_t len_hos
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
|
||||
|
||||
static uint8_t tvb_get_varint(const uint8_t *tvb, uint64_t *value)
|
||||
{
|
||||
switch (*tvb >> 6)
|
||||
{
|
||||
case 0: /* 0b00 => 1 byte length (6 bits Usable) */
|
||||
if (value) *value = *tvb & 0x3F;
|
||||
return 1;
|
||||
case 1: /* 0b01 => 2 bytes length (14 bits Usable) */
|
||||
if (value) *value = ntohs(*(uint16_t*)tvb) & 0x3FFF;
|
||||
return 2;
|
||||
case 2: /* 0b10 => 4 bytes length (30 bits Usable) */
|
||||
if (value) *value = ntohl(*(uint32_t*)tvb) & 0x3FFFFFFF;
|
||||
return 4;
|
||||
case 3: /* 0b11 => 8 bytes length (62 bits Usable) */
|
||||
if (value) *value = pntoh64(tvb) & 0x3FFFFFFFFFFFFFFF;
|
||||
return 8;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
static uint8_t tvb_get_size(uint8_t tvb)
|
||||
{
|
||||
switch(tvb >> 6)
|
||||
{
|
||||
case 0: /* 0b00 => 1 byte length (6 bits Usable) */
|
||||
return 1;
|
||||
case 1: /* 0b01 => 2 bytes length (14 bits Usable) */
|
||||
return 2;
|
||||
case 2: /* 0b10 => 4 bytes length (30 bits Usable) */
|
||||
return 4;
|
||||
case 3: /* 0b11 => 8 bytes length (62 bits Usable) */
|
||||
return 8;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
bool IsQUICCryptoHello(const uint8_t *data, size_t len, size_t *hello_offset, size_t *hello_len)
|
||||
{
|
||||
size_t offset = 1;
|
||||
uint64_t coff, clen;
|
||||
if (len < 3 || *data != 6) return false;
|
||||
offset += tvb_get_varint(data + offset, &coff);
|
||||
if (offset >= len) return false;
|
||||
offset += tvb_get_varint(data + offset, &clen);
|
||||
if (offset >= len || data[offset] != 0x01 || (offset + coff + clen) > len) return false;
|
||||
if (hello_offset) *hello_offset = offset + coff;
|
||||
if (hello_len) *hello_len = (size_t)clen;
|
||||
return true;
|
||||
}
|
||||
bool IsTLSClientHello(const uint8_t *data, size_t len)
|
||||
{
|
||||
return len >= 6 && data[0] == 0x16 && data[1] == 0x03 && data[2] >= 0x01 && data[2] <= 0x03 && data[5] == 0x01 && (ntohs(*(uint16_t*)(data + 3)) + 5) <= len;
|
||||
}
|
||||
bool TLSFindExt(const uint8_t *data, size_t len, uint16_t type, const uint8_t **ext, size_t *len_ext)
|
||||
bool TLSFindExtInHandshake(const uint8_t *data, size_t len, uint16_t type, const uint8_t **ext, size_t *len_ext)
|
||||
{
|
||||
// +0
|
||||
// u8 ContentType: Handshake
|
||||
// u16 Version: TLS1.0
|
||||
// u16 Length
|
||||
// +5
|
||||
// u8 HandshakeType: ClientHello
|
||||
// u24 Length
|
||||
// u16 Version
|
||||
@ -68,11 +115,11 @@ bool TLSFindExt(const uint8_t *data, size_t len, uint16_t type, const uint8_t **
|
||||
|
||||
size_t l, ll;
|
||||
|
||||
l = 1 + 2 + 2 + 1 + 3 + 2 + 32;
|
||||
l = 1 + 3 + 2 + 32;
|
||||
// SessionIDLength
|
||||
if (len < (l + 1)) return false;
|
||||
ll = data[6] << 16 | data[7] << 8 | data[8]; // HandshakeProtocol length
|
||||
if (len < (ll + 9)) return false;
|
||||
ll = data[1] << 16 | data[2] << 8 | data[3]; // HandshakeProtocol length
|
||||
if (len < (ll + 4)) return false;
|
||||
l += data[l] + 1;
|
||||
// CipherSuitesLength
|
||||
if (len < (l + 2)) return false;
|
||||
@ -109,12 +156,17 @@ bool TLSFindExt(const uint8_t *data, size_t len, uint16_t type, const uint8_t **
|
||||
|
||||
return false;
|
||||
}
|
||||
bool TLSHelloExtractHost(const uint8_t *data, size_t len, char *host, size_t len_host)
|
||||
bool TLSFindExt(const uint8_t *data, size_t len, uint16_t type, const uint8_t **ext, size_t *len_ext)
|
||||
{
|
||||
// +0
|
||||
// u8 ContentType: Handshake
|
||||
// u16 Version: TLS1.0
|
||||
// u16 Length
|
||||
if (!IsTLSClientHello(data, len)) return false;
|
||||
return TLSFindExtInHandshake(data + 5, len - 5, type, ext, len_ext);
|
||||
}
|
||||
static bool TLSExtractHostFromExt(const uint8_t *ext, size_t elen, char *host, size_t len_host)
|
||||
{
|
||||
const uint8_t *ext;
|
||||
size_t elen;
|
||||
|
||||
if (!TLSFindExt(data, len, 0, &ext, &elen)) return false;
|
||||
// u16 data+0 - name list length
|
||||
// u8 data+2 - server name type. 0=host_name
|
||||
// u16 data+3 - server name length
|
||||
@ -130,11 +182,27 @@ bool TLSHelloExtractHost(const uint8_t *data, size_t len, char *host, size_t len
|
||||
}
|
||||
return true;
|
||||
}
|
||||
bool TLSHelloExtractHost(const uint8_t *data, size_t len, char *host, size_t len_host)
|
||||
{
|
||||
const uint8_t *ext;
|
||||
size_t elen;
|
||||
|
||||
if (!TLSFindExt(data, len, 0, &ext, &elen)) return false;
|
||||
return TLSExtractHostFromExt(ext, elen, host, len_host);
|
||||
}
|
||||
bool TLSHelloExtractHostFromHandshake(const uint8_t *data, size_t len, char *host, size_t len_host)
|
||||
{
|
||||
const uint8_t *ext;
|
||||
size_t elen;
|
||||
|
||||
if (!TLSFindExtInHandshake(data, len, 0, &ext, &elen)) return false;
|
||||
return TLSExtractHostFromExt(ext, elen, host, len_host);
|
||||
}
|
||||
|
||||
|
||||
#define QUIC_MAX_CID_LENGTH 20
|
||||
/* Returns the QUIC draft version or 0 if not applicable. */
|
||||
static inline uint8_t quic_draft_version(uint32_t version) {
|
||||
uint8_t QUICDraftVersion(uint32_t version)
|
||||
{
|
||||
/* IETF Draft versions */
|
||||
if ((version >> 8) == 0xff0000) {
|
||||
return (uint8_t)version;
|
||||
@ -176,13 +244,286 @@ static inline uint8_t quic_draft_version(uint32_t version) {
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline bool is_quic_draft_max(uint32_t draft_version, uint8_t max_version)
|
||||
{
|
||||
return draft_version && draft_version <= max_version;
|
||||
}
|
||||
static bool is_quic_ver_less_than(uint32_t version, uint8_t max_version)
|
||||
{
|
||||
return is_quic_draft_max(QUICDraftVersion(version), max_version);
|
||||
}
|
||||
static bool is_version_with_v1_labels(uint32_t version)
|
||||
{
|
||||
if (((version & 0xFFFFFF00) == 0x51303500) /* Q05X */ ||
|
||||
((version & 0xFFFFFF00) == 0x54303500)) /* T05X */
|
||||
return true;
|
||||
return is_quic_ver_less_than(version, 34);
|
||||
}
|
||||
|
||||
|
||||
static bool quic_hkdf_expand_label(uint8_t *secret, uint8_t secret_len, const char *label, uint8_t *out, size_t out_len)
|
||||
{
|
||||
uint8_t hkdflabel[64];
|
||||
|
||||
size_t label_size = strlen(label);
|
||||
if (label_size > 255) return false;
|
||||
size_t hkdflabel_size = 2 + 1 + label_size + 1;
|
||||
if (hkdflabel_size > sizeof(hkdflabel)) return false;
|
||||
|
||||
*(uint16_t*)hkdflabel = htons(out_len);
|
||||
hkdflabel[2] = (uint8_t)label_size;
|
||||
memcpy(hkdflabel + 3, label, label_size);
|
||||
hkdflabel[3 + label_size] = 0;
|
||||
return !hkdfExpand(SHA256, secret, secret_len, hkdflabel, hkdflabel_size, out, out_len);
|
||||
}
|
||||
|
||||
|
||||
static bool quic_derive_initial_secret(const quic_cid_t *cid, uint8_t *client_initial_secret, uint32_t version)
|
||||
{
|
||||
/*
|
||||
* https://tools.ietf.org/html/draft-ietf-quic-tls-29#section-5.2
|
||||
*
|
||||
* initial_salt = 0xafbfec289993d24c9e9786f19c6111e04390a899
|
||||
* initial_secret = HKDF-Extract(initial_salt, client_dst_connection_id)
|
||||
*
|
||||
* client_initial_secret = HKDF-Expand-Label(initial_secret,
|
||||
* "client in", "", Hash.length)
|
||||
* server_initial_secret = HKDF-Expand-Label(initial_secret,
|
||||
* "server in", "", Hash.length)
|
||||
*
|
||||
* Hash for handshake packets is SHA-256 (output size 32).
|
||||
*/
|
||||
static const uint8_t handshake_salt_draft_22[20] = {
|
||||
0x7f, 0xbc, 0xdb, 0x0e, 0x7c, 0x66, 0xbb, 0xe9, 0x19, 0x3a,
|
||||
0x96, 0xcd, 0x21, 0x51, 0x9e, 0xbd, 0x7a, 0x02, 0x64, 0x4a
|
||||
};
|
||||
static const uint8_t handshake_salt_draft_23[20] = {
|
||||
0xc3, 0xee, 0xf7, 0x12, 0xc7, 0x2e, 0xbb, 0x5a, 0x11, 0xa7,
|
||||
0xd2, 0x43, 0x2b, 0xb4, 0x63, 0x65, 0xbe, 0xf9, 0xf5, 0x02,
|
||||
};
|
||||
static const uint8_t handshake_salt_draft_29[20] = {
|
||||
0xaf, 0xbf, 0xec, 0x28, 0x99, 0x93, 0xd2, 0x4c, 0x9e, 0x97,
|
||||
0x86, 0xf1, 0x9c, 0x61, 0x11, 0xe0, 0x43, 0x90, 0xa8, 0x99
|
||||
};
|
||||
static const uint8_t handshake_salt_v1[20] = {
|
||||
0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17,
|
||||
0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a
|
||||
};
|
||||
static const uint8_t hanshake_salt_draft_q50[20] = {
|
||||
0x50, 0x45, 0x74, 0xEF, 0xD0, 0x66, 0xFE, 0x2F, 0x9D, 0x94,
|
||||
0x5C, 0xFC, 0xDB, 0xD3, 0xA7, 0xF0, 0xD3, 0xB5, 0x6B, 0x45
|
||||
};
|
||||
static const uint8_t hanshake_salt_draft_t50[20] = {
|
||||
0x7f, 0xf5, 0x79, 0xe5, 0xac, 0xd0, 0x72, 0x91, 0x55, 0x80,
|
||||
0x30, 0x4c, 0x43, 0xa2, 0x36, 0x7c, 0x60, 0x48, 0x83, 0x10
|
||||
};
|
||||
static const uint8_t hanshake_salt_draft_t51[20] = {
|
||||
0x7a, 0x4e, 0xde, 0xf4, 0xe7, 0xcc, 0xee, 0x5f, 0xa4, 0x50,
|
||||
0x6c, 0x19, 0x12, 0x4f, 0xc8, 0xcc, 0xda, 0x6e, 0x03, 0x3d
|
||||
};
|
||||
static const uint8_t handshake_salt_v2_draft_00[20] = {
|
||||
0xa7, 0x07, 0xc2, 0x03, 0xa5, 0x9b, 0x47, 0x18, 0x4a, 0x1d,
|
||||
0x62, 0xca, 0x57, 0x04, 0x06, 0xea, 0x7a, 0xe3, 0xe5, 0xd3
|
||||
};
|
||||
|
||||
int err;
|
||||
const uint8_t *salt;
|
||||
uint8_t secret[USHAMaxHashSize];
|
||||
uint8_t draft_version = QUICDraftVersion(version);
|
||||
|
||||
if (version == 0x51303530) {
|
||||
salt = hanshake_salt_draft_q50;
|
||||
}
|
||||
else if (version == 0x54303530) {
|
||||
salt = hanshake_salt_draft_t50;
|
||||
}
|
||||
else if (version == 0x54303531) {
|
||||
salt = hanshake_salt_draft_t51;
|
||||
}
|
||||
else if (is_quic_draft_max(draft_version, 22)) {
|
||||
salt = handshake_salt_draft_22;
|
||||
}
|
||||
else if (is_quic_draft_max(draft_version, 28)) {
|
||||
salt = handshake_salt_draft_23;
|
||||
}
|
||||
else if (is_quic_draft_max(draft_version, 32)) {
|
||||
salt = handshake_salt_draft_29;
|
||||
}
|
||||
else if (is_quic_draft_max(draft_version, 34)) {
|
||||
salt = handshake_salt_v1;
|
||||
}
|
||||
else {
|
||||
salt = handshake_salt_v2_draft_00;
|
||||
}
|
||||
|
||||
err = hkdfExtract(SHA256, salt, 20, cid->cid, cid->len, secret);
|
||||
if (err) return false;
|
||||
|
||||
if (client_initial_secret && !quic_hkdf_expand_label(secret, SHA256HashSize, "tls13 client in", client_initial_secret, SHA256HashSize))
|
||||
return false;
|
||||
|
||||
return true;
|
||||
}
|
||||
bool QUICIsLongHeader(const uint8_t *data, size_t len)
|
||||
{
|
||||
return len>=9 && !!(*data & 0x80);
|
||||
}
|
||||
uint32_t QUICExtractVersion(const uint8_t *data, size_t len)
|
||||
{
|
||||
// long header, fixed bit, type=initial
|
||||
return QUICIsLongHeader(data, len) ? ntohl(*(uint32_t*)(data + 1)) : 0;
|
||||
}
|
||||
bool QUICExtractDCID(const uint8_t *data, size_t len, quic_cid_t *cid)
|
||||
{
|
||||
if (!QUICIsLongHeader(data,len) || !data[5] || data[5] > QUIC_MAX_CID_LENGTH || (6+data[5])>len) return false;
|
||||
cid->len = data[5];
|
||||
memcpy(&cid->cid, data + 6, data[5]);
|
||||
return true;
|
||||
}
|
||||
bool QUICDecryptInitial(const uint8_t *data, size_t data_len, uint8_t *clean, size_t *clean_len)
|
||||
{
|
||||
uint32_t ver = QUICExtractVersion(data, data_len);
|
||||
if (!ver) return false;
|
||||
|
||||
quic_cid_t dcid;
|
||||
if (!QUICExtractDCID(data, data_len, &dcid)) return false;
|
||||
|
||||
uint8_t client_initial_secret[SHA256HashSize];
|
||||
if (!quic_derive_initial_secret(&dcid, client_initial_secret, ver)) return false;
|
||||
|
||||
uint8_t aeskey[16], aesiv[12], aeshp[16];
|
||||
bool v1_label = is_version_with_v1_labels(ver);
|
||||
if (!quic_hkdf_expand_label(client_initial_secret, SHA256HashSize, v1_label ? "tls13 quic key" : "tls13 quicv2 key", aeskey, sizeof(aeskey)) ||
|
||||
!quic_hkdf_expand_label(client_initial_secret, SHA256HashSize, v1_label ? "tls13 quic iv" : "tls13 quicv2 iv", aesiv, sizeof(aesiv)) ||
|
||||
!quic_hkdf_expand_label(client_initial_secret, SHA256HashSize, v1_label ? "tls13 quic hp" : "tls13 quicv2 hp", aeshp, sizeof(aeshp)))
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
uint64_t payload_len,token_len;
|
||||
size_t pn_offset;
|
||||
pn_offset = 1 + 4 + 1 + data[5];
|
||||
if (pn_offset >= data_len) return false;
|
||||
pn_offset += 1 + data[pn_offset];
|
||||
if ((pn_offset + 8) > data_len) return false;
|
||||
pn_offset += tvb_get_varint(data + pn_offset, &token_len);
|
||||
pn_offset += token_len;
|
||||
if ((pn_offset + 8) > data_len) return false;
|
||||
pn_offset += tvb_get_varint(data + pn_offset, &payload_len);
|
||||
if (payload_len<20 || (pn_offset + payload_len)>data_len) return false;
|
||||
|
||||
aes_init_keygen_tables();
|
||||
|
||||
uint8_t sample_enc[16];
|
||||
aes_context ctx;
|
||||
if (aes_setkey(&ctx, 1, aeshp, sizeof(aeshp)) || aes_cipher(&ctx, data + pn_offset + 4, sample_enc)) return false;
|
||||
|
||||
uint8_t mask[5];
|
||||
memcpy(mask, sample_enc, sizeof(mask));
|
||||
|
||||
uint8_t packet0 = data[0] ^ (mask[0] & 0x0f);
|
||||
uint32_t pkn_len = (packet0 & 0x03) + 1;
|
||||
|
||||
uint8_t pkn_bytes[4];
|
||||
memcpy(pkn_bytes, data + pn_offset, pkn_len);
|
||||
uint32_t pkn = 0;
|
||||
for (uint32_t i = 0; i < pkn_len; i++) pkn |= (uint32_t)(pkn_bytes[i] ^ mask[1 + i]) << (8 * (pkn_len - 1 - i));
|
||||
|
||||
phton64(aesiv + sizeof(aesiv) - 8, pntoh64(aesiv + sizeof(aesiv) - 8) ^ pkn);
|
||||
|
||||
size_t cryptlen = payload_len - pkn_len - 16;
|
||||
if (cryptlen > *clean_len) return false;
|
||||
*clean_len = cryptlen;
|
||||
const uint8_t *decrypt_begin = data + pn_offset + pkn_len;
|
||||
|
||||
return !aes_gcm_decrypt(clean, decrypt_begin, cryptlen, aeskey, sizeof(aeskey), aesiv, sizeof(aesiv));
|
||||
}
|
||||
|
||||
bool QUICDefragCrypto(const uint8_t *clean,size_t clean_len, uint8_t *defrag,size_t *defrag_len)
|
||||
{
|
||||
if (*defrag_len<10) return false;
|
||||
uint8_t *defrag_data = defrag+10;
|
||||
size_t defrag_data_len = *defrag_len-10;
|
||||
|
||||
uint8_t ft;
|
||||
uint64_t offset,sz,szmax=0,zeropos=0,pos=0;
|
||||
bool found=false;
|
||||
|
||||
while(pos<clean_len)
|
||||
{
|
||||
ft = clean[pos];
|
||||
pos++;
|
||||
if (ft>1) // 00 - padding, 01 - ping
|
||||
{
|
||||
if (ft!=6) return false; // dont want to know all possible frame type formats
|
||||
|
||||
if (pos>=clean_len) return false;
|
||||
|
||||
if ((pos+tvb_get_size(clean[pos])>clean_len)) return false;
|
||||
pos += tvb_get_varint(clean+pos, &offset);
|
||||
|
||||
if ((pos+tvb_get_size(clean[pos])>clean_len)) return false;
|
||||
pos += tvb_get_varint(clean+pos, &sz);
|
||||
if ((pos+sz)>clean_len) return false;
|
||||
|
||||
|
||||
if (ft==6)
|
||||
{
|
||||
if ((offset+sz)>defrag_data_len) return false;
|
||||
if (zeropos < offset)
|
||||
// make sure no uninitialized gaps exist in case of not full fragment coverage
|
||||
memset(defrag_data+zeropos,0,offset-zeropos);
|
||||
if ((offset+sz) > zeropos)
|
||||
zeropos=offset+sz;
|
||||
memcpy(defrag_data+offset,clean+pos,sz);
|
||||
if ((offset+sz) > szmax) szmax = offset+sz;
|
||||
found=true;
|
||||
}
|
||||
|
||||
pos+=sz;
|
||||
}
|
||||
}
|
||||
if (found)
|
||||
{
|
||||
defrag[0] = 6;
|
||||
defrag[1] = 0; // offset
|
||||
// 2..9 - length 64 bit
|
||||
// +10 - data start
|
||||
phton64(defrag+2,szmax);
|
||||
defrag[2] |= 0xC0; // 64 bit value
|
||||
*defrag_len = (size_t)(szmax+10);
|
||||
}
|
||||
return found;
|
||||
}
|
||||
|
||||
|
||||
bool QUICExtractHostFromInitial(const uint8_t *data, size_t data_len, char *host, size_t len_host, bool *bIsCryptoHello)
|
||||
{
|
||||
if (bIsCryptoHello) *bIsCryptoHello=false;
|
||||
|
||||
uint8_t clean[1500];
|
||||
size_t clean_len = sizeof(clean);
|
||||
if (!QUICDecryptInitial(data,data_len,clean,&clean_len)) return false;
|
||||
|
||||
uint8_t defrag[1500];
|
||||
size_t defrag_len = sizeof(defrag);
|
||||
if (!QUICDefragCrypto(clean,clean_len,defrag,&defrag_len)) return false;
|
||||
|
||||
size_t hello_offset, hello_len;
|
||||
if (!IsQUICCryptoHello(defrag, defrag_len, &hello_offset, &hello_len)) return false;
|
||||
if (bIsCryptoHello) *bIsCryptoHello=true;
|
||||
|
||||
return TLSHelloExtractHostFromHandshake(defrag + hello_offset, hello_len, host, len_host);
|
||||
}
|
||||
|
||||
bool IsQUICInitial(uint8_t *data, size_t len)
|
||||
{
|
||||
// long header, fixed bit, type=initial
|
||||
if (len < 512 || (data[0] & 0xF0) != 0xC0) return false;
|
||||
uint8_t *p = data + 1;
|
||||
uint32_t ver = ntohl(*(uint32_t*)p);
|
||||
if (quic_draft_version(ver) < 11) return false;
|
||||
if (QUICDraftVersion(ver) < 11) return false;
|
||||
p += 4;
|
||||
if (!*p || *p > QUIC_MAX_CID_LENGTH) return false;
|
||||
return true;
|
||||
|
||||
@ -3,10 +3,31 @@
|
||||
#include <stddef.h>
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
#include "crypto/sha.h"
|
||||
#include "crypto/aes-gcm.h"
|
||||
|
||||
bool IsHttp(const uint8_t *data, size_t len);
|
||||
bool HttpExtractHost(const uint8_t *data, size_t len, char *host, size_t len_host);
|
||||
|
||||
bool IsTLSClientHello(const uint8_t *data, size_t len);
|
||||
bool TLSFindExt(const uint8_t *data, size_t len, uint16_t type, const uint8_t **ext, size_t *len_ext);
|
||||
bool TLSFindExtInHandshake(const uint8_t *data, size_t len, uint16_t type, const uint8_t **ext, size_t *len_ext);
|
||||
bool TLSHelloExtractHost(const uint8_t *data, size_t len, char *host, size_t len_host);
|
||||
bool TLSHelloExtractHostFromHandshake(const uint8_t *data, size_t len, char *host, size_t len_host);
|
||||
|
||||
#define QUIC_MAX_CID_LENGTH 20
|
||||
typedef struct quic_cid {
|
||||
uint8_t len;
|
||||
uint8_t cid[QUIC_MAX_CID_LENGTH];
|
||||
} quic_cid_t;
|
||||
|
||||
bool IsQUICInitial(uint8_t *data, size_t len);
|
||||
bool IsQUICCryptoHello(const uint8_t *data, size_t len, size_t *hello_offset, size_t *hello_len);
|
||||
bool QUICIsLongHeader(const uint8_t *data, size_t len);
|
||||
uint32_t QUICExtractVersion(const uint8_t *data, size_t len);
|
||||
uint8_t QUICDraftVersion(uint32_t version);
|
||||
bool QUICExtractDCID(const uint8_t *data, size_t len, quic_cid_t *cid);
|
||||
|
||||
bool QUICDecryptInitial(const uint8_t *data, size_t data_len, uint8_t *clean, size_t *clean_len);
|
||||
bool QUICDefragCrypto(const uint8_t *clean,size_t clean_len, uint8_t *defrag,size_t *defrag_len);
|
||||
bool QUICExtractHostFromInitial(const uint8_t *data, size_t data_len, char *host, size_t len_host, bool *bIsCryptoHello);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user