sha4.h

SHA家族加密算法实现方式, C语言版本

/**
 * file sha4.h
 */
#ifndef _SHA4_H
#define _SHA4_H

#if defined(_MSC_VER) || defined(__WATCOMC__)
  #define UL64(x) x##ui64
  #define int64 __int64
#else
  #define UL64(x) x##ULL
  #define int64 long long
#endif

/**
 * brief          SHA-512 context structure
 */
typedef struct
{
    unsigned int64 total[2];    /*!< number of bytes processed  */
    unsigned int64 state[8];    /*!< intermediate digest state  */
    unsigned char buffer[128];  /*!< data block being processed */

    unsigned char ipad[128];    /*!< HMAC: inner padding        */
    unsigned char opad[128];    /*!< HMAC: outer padding        */
    int is384;                  /*!< 0 => SHA-512, else SHA-384 */
}
sha4_context;

#ifdef __cplusplus
extern "C" {
#endif

	/**
	 * brief          SHA-512 context setup
	 * param ctx      context to be initialized
	 * param is384    0 = use SHA512, 1 = use SHA384
	 */
	void sha4_starts( sha4_context *ctx, int is384 );

	/**
	 * brief          SHA-512 process buffer
	 * param ctx      SHA-512 context
	 * param input    buffer holding the  data
	 * param ilen     length of the input data
	 */
	void sha4_update( sha4_context *ctx, unsigned char *input, int ilen );

	/**
	 * brief          SHA-512 final digest
	 * param ctx      SHA-512 context
	 * param output   SHA-384/512 checksum result
	 */
	void sha4_finish( sha4_context *ctx, unsigned char output[64] );

#ifdef __cplusplus
}
#endif

#endif /* sha4.h */