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516 lines
16 KiB
C
516 lines
16 KiB
C
/******************************************************************************
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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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{ \
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(n) = ((uint32_t)(b)[(i)]) | ((uint32_t)(b)[(i) + 1] << 8) | ((uint32_t)(b)[(i) + 2] << 16) | ((uint32_t)(b)[(i) + 3] << 24); \
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}
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#define PUT_UINT32_LE(n, b, i) \
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{ \
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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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/*
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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) \
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{ \
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y = ((y << 1) | (y >> 7)) & 0xFF; \
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x ^= y; \
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}
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#define CPY128 \
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{ \
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*RK++ = *SK++; \
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*RK++ = *SK++; \
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*RK++ = *SK++; \
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*RK++ = *SK++; \
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}
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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)
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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
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/******************************************************************************
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*
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* AES_SET_DECRYPTION_KEY
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*
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* This is called by 'aes_setkey' when we're establishing a
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* key for subsequent decryption. We give it a pointer to
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* the encryption context, a pointer to the key, and the key's
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* length in bits. Valid lengths are: 128, 192, or 256 bits.
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*
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******************************************************************************/
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int aes_set_decryption_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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int i, j;
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aes_context cty; // a calling aes context for set_encryption_key
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uint32_t *RK = ctx->rk; // initialize our RoundKey buffer pointer
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uint32_t *SK;
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int ret;
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cty.rounds = ctx->rounds; // initialize our local aes context
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cty.rk = cty.buf; // round count and key buf pointer
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if ((ret = aes_set_encryption_key(&cty, key, keysize)) != 0)
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return (ret);
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SK = cty.rk + cty.rounds * 4;
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CPY128 // copy a 128-bit block from *SK to *RK
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for (i = ctx->rounds - 1, SK -= 8; i > 0; i--, SK -= 8)
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{
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for (j = 0; j < 4; j++, SK++)
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{
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*RK++ = RT0[FSb[(*SK) & 0xFF]] ^
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RT1[FSb[(*SK >> 8) & 0xFF]] ^
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RT2[FSb[(*SK >> 16) & 0xFF]] ^
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RT3[FSb[(*SK >> 24) & 0xFF]];
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}
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}
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CPY128 // copy a 128-bit block from *SK to *RK
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memset(&cty, 0, sizeof(aes_context)); // clear local aes context
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return (0);
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}
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#endif /* AES_DECRYPTION */
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/******************************************************************************
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*
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* AES_SETKEY
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*
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* Invoked to establish the key schedule for subsequent encryption/decryption
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*
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******************************************************************************/
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int aes_setkey(aes_context *ctx, // AES context provided by our caller
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int mode, // ENCRYPT or DECRYPT flag
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const uchar *key, // pointer to the key
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uint keysize) // key length in bytes
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{
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// since table initialization is not thread safe, we could either add
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// system-specific mutexes and init the AES key generation tables on
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// demand, or ask the developer to simply call "gcm_initialize" once during
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// application startup before threading begins. That's what we choose.
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if (!aes_tables_inited)
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return (-1); // fail the call when not inited.
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ctx->mode = mode; // capture the key type we're creating
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ctx->rk = ctx->buf; // initialize our round key pointer
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switch (keysize) // set the rounds count based upon the keysize
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{
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case 16:
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ctx->rounds = 10;
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break; // 16-byte, 128-bit key
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case 24:
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ctx->rounds = 12;
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break; // 24-byte, 192-bit key
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case 32:
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ctx->rounds = 14;
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break; // 32-byte, 256-bit key
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default:
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return (-1);
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}
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#if AES_DECRYPTION
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if (mode == DECRYPT) // expand our key for encryption or decryption
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return (aes_set_decryption_key(ctx, key, keysize));
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else /* ENCRYPT */
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#endif /* AES_DECRYPTION */
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return (aes_set_encryption_key(ctx, key, keysize));
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}
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/******************************************************************************
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*
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* AES_CIPHER
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*
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* Perform AES encryption and decryption.
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* The AES context will have been setup with the encryption mode
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* and all keying information appropriate for the task.
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*
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******************************************************************************/
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int aes_cipher(aes_context *ctx,
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const uchar input[16],
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uchar output[16])
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{
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int i;
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uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3; // general purpose locals
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RK = ctx->rk;
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GET_UINT32_LE(X0, input, 0);
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X0 ^= *RK++; // load our 128-bit
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GET_UINT32_LE(X1, input, 4);
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X1 ^= *RK++; // input buffer in a storage
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GET_UINT32_LE(X2, input, 8);
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X2 ^= *RK++; // memory endian-neutral way
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GET_UINT32_LE(X3, input, 12);
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X3 ^= *RK++;
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#if AES_DECRYPTION // whether AES decryption is supported
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if (ctx->mode == DECRYPT)
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{
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for (i = (ctx->rounds >> 1) - 1; i > 0; i--)
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{
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AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
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AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3);
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}
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AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3);
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X0 = *RK++ ^
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((uint32_t)RSb[(Y0) & 0xFF]) ^
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((uint32_t)RSb[(Y3 >> 8) & 0xFF] << 8) ^
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((uint32_t)RSb[(Y2 >> 16) & 0xFF] << 16) ^
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((uint32_t)RSb[(Y1 >> 24) & 0xFF] << 24);
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X1 = *RK++ ^
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((uint32_t)RSb[(Y1) & 0xFF]) ^
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((uint32_t)RSb[(Y0 >> 8) & 0xFF] << 8) ^
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((uint32_t)RSb[(Y3 >> 16) & 0xFF] << 16) ^
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((uint32_t)RSb[(Y2 >> 24) & 0xFF] << 24);
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X2 = *RK++ ^
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((uint32_t)RSb[(Y2) & 0xFF]) ^
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((uint32_t)RSb[(Y1 >> 8) & 0xFF] << 8) ^
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((uint32_t)RSb[(Y0 >> 16) & 0xFF] << 16) ^
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((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 */
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|
{
|
|
#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 */
|