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245 lines
8.6 KiB
C
245 lines
8.6 KiB
C
#pragma once
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/*
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* Description:
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* This file implements the Secure Hash Algorithms
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* as defined in the U.S. National Institute of Standards
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* and Technology Federal Information Processing Standards
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* Publication (FIPS PUB) 180-3 published in October 2008
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* and formerly defined in its predecessors, FIPS PUB 180-1
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* and FIP PUB 180-2.
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*
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* A combined document showing all algorithms is available at
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* http://csrc.nist.gov/publications/fips/
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* fips180-3/fips180-3_final.pdf
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*
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* The five hashes are defined in these sizes:
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* SHA-1 20 byte / 160 bit
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* SHA-224 28 byte / 224 bit
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* SHA-256 32 byte / 256 bit
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* SHA-384 48 byte / 384 bit
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* SHA-512 64 byte / 512 bit
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*
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* Compilation Note:
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* These files may be compiled with two options:
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* USE_32BIT_ONLY - use 32-bit arithmetic only, for systems
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* without 64-bit integers
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*
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* USE_MODIFIED_MACROS - use alternate form of the SHA_Ch()
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* and SHA_Maj() macros that are equivalent
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* and potentially faster on many systems
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*
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*/
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#include <stdint.h>
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#include <stddef.h>
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/*
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* If you do not have the ISO standard stdint.h header file, then you
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* must typedef the following:
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* name meaning
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* uint64_t unsigned 64-bit integer
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* uint32_t unsigned 32-bit integer
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* uint8_t unsigned 8-bit integer (i.e., unsigned char)
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* int_least16_t integer of >= 16 bits
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*
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* See stdint-example.h
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*/
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#ifndef _SHA_enum_
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#define _SHA_enum_
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/*
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* All SHA functions return one of these values.
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*/
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enum {
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shaSuccess = 0,
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shaNull, /* Null pointer parameter */
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shaInputTooLong, /* input data too long */
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shaStateError, /* called Input after FinalBits or Result */
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shaBadParam /* passed a bad parameter */
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};
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#endif /* _SHA_enum_ */
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/*
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* These constants hold size information for each of the SHA
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* hashing operations
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*/
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enum {
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SHA1_Message_Block_Size = 64, SHA224_Message_Block_Size = 64,
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SHA256_Message_Block_Size = 64,
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USHA_Max_Message_Block_Size = SHA256_Message_Block_Size,
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SHA1HashSize = 20, SHA224HashSize = 28, SHA256HashSize = 32,
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USHAMaxHashSize = SHA256HashSize,
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SHA1HashSizeBits = 160, SHA224HashSizeBits = 224,
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SHA256HashSizeBits = 256, USHAMaxHashSizeBits = SHA256HashSizeBits
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};
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/*
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* These constants are used in the USHA (Unified SHA) functions.
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*/
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typedef enum SHAversion {
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SHA224, SHA256
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} SHAversion;
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/*
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* This structure will hold context information for the SHA-256
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* hashing operation.
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*/
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typedef struct SHA256Context {
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uint32_t Intermediate_Hash[SHA256HashSize/4]; /* Message Digest */
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uint32_t Length_High; /* Message length in bits */
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uint32_t Length_Low; /* Message length in bits */
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int_least16_t Message_Block_Index; /* Message_Block array index */
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/* 512-bit message blocks */
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uint8_t Message_Block[SHA256_Message_Block_Size];
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int Computed; /* Is the hash computed? */
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int Corrupted; /* Cumulative corruption code */
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} SHA256Context;
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/*
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* This structure will hold context information for the SHA-224
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* hashing operation. It uses the SHA-256 structure for computation.
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*/
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typedef struct SHA256Context SHA224Context;
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/*
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* This structure holds context information for all SHA
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* hashing operations.
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*/
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typedef struct USHAContext {
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int whichSha; /* which SHA is being used */
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union {
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SHA224Context sha224Context; SHA256Context sha256Context;
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} ctx;
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} USHAContext;
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/*
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* This structure will hold context information for the HMAC
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* keyed-hashing operation.
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*/
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typedef struct HMACContext {
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int whichSha; /* which SHA is being used */
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int hashSize; /* hash size of SHA being used */
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int blockSize; /* block size of SHA being used */
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USHAContext shaContext; /* SHA context */
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unsigned char k_opad[USHA_Max_Message_Block_Size];
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/* outer padding - key XORd with opad */
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int Computed; /* Is the MAC computed? */
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int Corrupted; /* Cumulative corruption code */
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} HMACContext;
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/*
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* This structure will hold context information for the HKDF
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* extract-and-expand Key Derivation Functions.
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*/
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typedef struct HKDFContext {
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int whichSha; /* which SHA is being used */
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HMACContext hmacContext;
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int hashSize; /* hash size of SHA being used */
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unsigned char prk[USHAMaxHashSize];
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/* pseudo-random key - output of hkdfInput */
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int Computed; /* Is the key material computed? */
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int Corrupted; /* Cumulative corruption code */
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} HKDFContext;
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/*
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* Function Prototypes
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*/
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/* SHA-224 */
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int SHA224Reset(SHA224Context *);
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int SHA224Input(SHA224Context *, const uint8_t *bytes,
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unsigned int bytecount);
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int SHA224FinalBits(SHA224Context *, uint8_t bits,
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unsigned int bit_count);
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int SHA224Result(SHA224Context *,
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uint8_t Message_Digest[SHA224HashSize]);
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/* SHA-256 */
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int SHA256Reset(SHA256Context *);
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int SHA256Input(SHA256Context *, const uint8_t *bytes,
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unsigned int bytecount);
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int SHA256FinalBits(SHA256Context *, uint8_t bits,
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unsigned int bit_count);
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int SHA256Result(SHA256Context *,
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uint8_t Message_Digest[SHA256HashSize]);
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/* Unified SHA functions, chosen by whichSha */
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int USHAReset(USHAContext *context, SHAversion whichSha);
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int USHAInput(USHAContext *context,
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const uint8_t *bytes, unsigned int bytecount);
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int USHAFinalBits(USHAContext *context,
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uint8_t bits, unsigned int bit_count);
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int USHAResult(USHAContext *context,
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uint8_t Message_Digest[USHAMaxHashSize]);
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int USHABlockSize(enum SHAversion whichSha);
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int USHAHashSize(enum SHAversion whichSha);
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/*
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* HMAC Keyed-Hashing for Message Authentication, RFC 2104,
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* for all SHAs.
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* This interface allows a fixed-length text input to be used.
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*/
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int hmac(SHAversion whichSha, /* which SHA algorithm to use */
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const unsigned char *text, /* pointer to data stream */
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size_t text_len, /* length of data stream */
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const unsigned char *key, /* pointer to authentication key */
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size_t key_len, /* length of authentication key */
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uint8_t digest[USHAMaxHashSize]); /* caller digest to fill in */
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/*
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* HMAC Keyed-Hashing for Message Authentication, RFC 2104,
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* for all SHAs.
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* This interface allows any length of text input to be used.
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*/
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int hmacReset(HMACContext *context, enum SHAversion whichSha,
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const unsigned char *key, size_t key_len);
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int hmacInput(HMACContext *context, const unsigned char *text,
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size_t text_len);
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int hmacFinalBits(HMACContext *context, uint8_t bits,
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unsigned int bit_count);
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int hmacResult(HMACContext *context,
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uint8_t digest[USHAMaxHashSize]);
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/*
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* HKDF HMAC-based Extract-and-Expand Key Derivation Function,
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* RFC 5869, for all SHAs.
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*/
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int hkdf(SHAversion whichSha,
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const unsigned char *salt, size_t salt_len,
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const unsigned char *ikm, size_t ikm_len,
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const unsigned char *info, size_t info_len,
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uint8_t okm[ ], size_t okm_len);
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int hkdfExtract(SHAversion whichSha, const unsigned char *salt,
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size_t salt_len, const unsigned char *ikm,
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size_t ikm_len, uint8_t prk[USHAMaxHashSize]);
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int hkdfExpand(SHAversion whichSha, const uint8_t prk[ ],
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size_t prk_len, const unsigned char *info,
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size_t info_len, uint8_t okm[ ], size_t okm_len);
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/*
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* HKDF HMAC-based Extract-and-Expand Key Derivation Function,
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* RFC 5869, for all SHAs.
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* This interface allows any length of text input to be used.
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*/
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int hkdfReset(HKDFContext *context, enum SHAversion whichSha,
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const unsigned char *salt, size_t salt_len);
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int hkdfInput(HKDFContext *context, const unsigned char *ikm,
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size_t ikm_len);
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int hkdfFinalBits(HKDFContext *context, uint8_t ikm_bits,
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unsigned int ikm_bit_count);
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int hkdfResult(HKDFContext *context,
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uint8_t prk[USHAMaxHashSize],
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const unsigned char *info, size_t info_len,
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uint8_t okm[USHAMaxHashSize], size_t okm_len);
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