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sha.h
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sha.h
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/**************************** sha.h ****************************/
/******************* See RFC 4634 for details ******************/
#ifndef _SHA_H_
#define _SHA_H_
/*
* Description:
* This file implements the Secure Hash Signature Standard
* algorithms as defined in the National Institute of Standards
* and Technology Federal Information Processing Standards
* Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
* published on August 1, 2002, and the FIPS PUB 180-2 Change
* Notice published on February 28, 2004.
*
* A combined document showing all algorithms is available at
* http://csrc.nist.gov/publications/fips/
* fips180-2/fips180-2withchangenotice.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
*/
#include <stdint.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
*
*/
#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, SHA384_Message_Block_Size = 128,
SHA512_Message_Block_Size = 128,
USHA_Max_Message_Block_Size = SHA512_Message_Block_Size,
SHA1HashSize = 20, SHA224HashSize = 28, SHA256HashSize = 32,
SHA384HashSize = 48, SHA512HashSize = 64,
USHAMaxHashSize = SHA512HashSize,
SHA1HashSizeBits = 160, SHA224HashSizeBits = 224,
SHA256HashSizeBits = 256, SHA384HashSizeBits = 384,
SHA512HashSizeBits = 512, USHAMaxHashSizeBits = SHA512HashSizeBits
};
/*
* These constants are used in the USHA (unified sha) functions.
*/
typedef enum SHAversion {
SHA1, SHA224, SHA256, SHA384, SHA512
} SHAversion;
/*
* This structure will hold context information for the SHA-1
* hashing operation.
*/
typedef struct SHA1Context {
uint32_t Intermediate_Hash[SHA1HashSize/4]; /* Message Digest */
uint32_t Length_Low; /* Message length in bits */
uint32_t Length_High; /* Message length in bits */
int_least16_t Message_Block_Index; /* Message_Block array index */
/* 512-bit message blocks */
uint8_t Message_Block[SHA1_Message_Block_Size];
int Computed; /* Is the digest computed? */
int Corrupted; /* Is the digest corrupted? */
} SHA1Context;
/*
* 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_Low; /* Message length in bits */
uint32_t Length_High; /* 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 digest computed? */
int Corrupted; /* Is the digest corrupted? */
} SHA256Context;
/*
* This structure will hold context information for the SHA-512
* hashing operation.
*/
typedef struct SHA512Context {
#ifdef USE_32BIT_ONLY
uint32_t Intermediate_Hash[SHA512HashSize/4]; /* Message Digest */
uint32_t Length[4]; /* Message length in bits */
#else /* !USE_32BIT_ONLY */
uint64_t Intermediate_Hash[SHA512HashSize/8]; /* Message Digest */
uint64_t Length_Low, Length_High; /* Message length in bits */
#endif /* USE_32BIT_ONLY */
int_least16_t Message_Block_Index; /* Message_Block array index */
/* 1024-bit message blocks */
uint8_t Message_Block[SHA512_Message_Block_Size];
int Computed; /* Is the digest computed?*/
int Corrupted; /* Is the digest corrupted? */
} SHA512Context;
/*
* 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 will hold context information for the SHA-384
* hashing operation. It uses the SHA-512 structure for computation.
*/
typedef struct SHA512Context SHA384Context;
/*
* This structure holds context information for all SHA
* hashing operations.
*/
typedef struct USHAContext {
int whichSha; /* which SHA is being used */
union {
SHA1Context sha1Context;
SHA224Context sha224Context; SHA256Context sha256Context;
SHA384Context sha384Context; SHA512Context sha512Context;
} 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 */
} HMACContext;
/*
* Function Prototypes
*/
/* SHA-1 */
extern int SHA1Reset(SHA1Context *);
extern int SHA1Input(SHA1Context *, const uint8_t *bytes,
unsigned int bytecount);
extern int SHA1FinalBits(SHA1Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA1Result(SHA1Context *,
uint8_t Message_Digest[SHA1HashSize]);
/* SHA-224 */
extern int SHA224Reset(SHA224Context *);
extern int SHA224Input(SHA224Context *, const uint8_t *bytes,
unsigned int bytecount);
extern int SHA224FinalBits(SHA224Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA224Result(SHA224Context *,
uint8_t Message_Digest[SHA224HashSize]);
/* SHA-256 */
extern int SHA256Reset(SHA256Context *);
extern int SHA256Input(SHA256Context *, const uint8_t *bytes,
unsigned int bytecount);
extern int SHA256FinalBits(SHA256Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA256Result(SHA256Context *,
uint8_t Message_Digest[SHA256HashSize]);
/* SHA-384 */
extern int SHA384Reset(SHA384Context *);
extern int SHA384Input(SHA384Context *, const uint8_t *bytes,
unsigned int bytecount);
extern int SHA384FinalBits(SHA384Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA384Result(SHA384Context *,
uint8_t Message_Digest[SHA384HashSize]);
/* SHA-512 */
extern int SHA512Reset(SHA512Context *);
extern int SHA512Input(SHA512Context *, const uint8_t *bytes,
unsigned int bytecount);
extern int SHA512FinalBits(SHA512Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA512Result(SHA512Context *,
uint8_t Message_Digest[SHA512HashSize]);
/* Unified SHA functions, chosen by whichSha */
extern int USHAReset(USHAContext *, SHAversion whichSha);
extern int USHAInput(USHAContext *,
const uint8_t *bytes, unsigned int bytecount);
extern int USHAFinalBits(USHAContext *,
const uint8_t bits, unsigned int bitcount);
extern int USHAResult(USHAContext *,
uint8_t Message_Digest[USHAMaxHashSize]);
extern int USHABlockSize(enum SHAversion whichSha);
extern int USHAHashSize(enum SHAversion whichSha);
extern int USHAHashSizeBits(enum SHAversion whichSha);
/*
* HMAC Keyed-Hashing for Message Authentication, RFC2104,
* for all SHAs.
* This interface allows a fixed-length text input to be used.
*/
extern int hmac(SHAversion whichSha, /* which SHA algorithm to use */
const unsigned char *text, /* pointer to data stream */
int text_len, /* length of data stream */
const unsigned char *key, /* pointer to authentication key */
int key_len, /* length of authentication key */
uint8_t digest[USHAMaxHashSize]); /* caller digest to fill in */
/*
* HMAC Keyed-Hashing for Message Authentication, RFC2104,
* for all SHAs.
* This interface allows any length of text input to be used.
*/
extern int hmacReset(HMACContext *ctx, enum SHAversion whichSha,
const unsigned char *key, int key_len);
extern int hmacInput(HMACContext *ctx, const unsigned char *text,
int text_len);
extern int hmacFinalBits(HMACContext *ctx, const uint8_t bits,
unsigned int bitcount);
extern int hmacResult(HMACContext *ctx,
uint8_t digest[USHAMaxHashSize]);
#endif /* _SHA_H_ */