zmd5.h

/*   
 *   zimg - high performance image storage and processing system.
 *       http://zimg.buaa.us 
 *   
 *   Copyright (c) 2013, Peter Zhao <zp@buaa.us>.
 *   All rights reserved.
 *   
 *   Use and distribution licensed under the BSD license.
 *   See the LICENSE file for full text.
 * 
 */

/**
 * @file zmd5.h
 * @brief Md5 caculator header.
 * @author 招牌疯子 zp@buaa.us
 * @version 1.0
 * @date 2013-07-19
 */


#ifndef ZMD5_H
#define ZMD5_H

#include <stdint.h>

/* use OpenSSL functions when available */
#ifdef HAVE_SSL
#include <openssl/md5.h>

#define md5_state_t MD5_CTX
#define md5_init(c) MD5_Init(c)
#define md5_append(c, data, len) MD5_Update(c, data, len);
#define md5_finish(c, md) MD5_Final(md, c)

#else
/*
 * This package supports both compile-time and run-time determination of CPU
 * byte order.  If ARCH_IS_BIG_ENDIAN is defined as 0, the code will be
 * compiled to run only on little-endian CPUs; if ARCH_IS_BIG_ENDIAN is
 * defined as non-zero, the code will be compiled to run only on big-endian
 * CPUs; if ARCH_IS_BIG_ENDIAN is not defined, the code will be compiled to
 * run on either big- or little-endian CPUs, but will run slightly less
 * efficiently on either one than if ARCH_IS_BIG_ENDIAN is defined.
 */

typedef uint8_t  md5_byte_t; /* 8-bit byte */
typedef uint32_t md5_word_t; /* 32-bit word */

/* Define the state of the MD5 Algorithm. */
typedef struct md5_state_s {
    md5_word_t count[2];	/* message length in bits, lsw first */
    md5_word_t abcd[4];		/* digest buffer */
    md5_byte_t buf[64];		/* accumulate block */
} md5_state_t;

#ifdef __cplusplus
extern "C" 
{
#endif

/* Initialize the algorithm. */
void md5_init(md5_state_t *pms);

/* Append a string to the message. */
void md5_append(md5_state_t *pms, const md5_byte_t *data, int nbytes);

/* Finish the message and return the digest. */
void md5_finish(md5_state_t *pms, md5_byte_t digest[16]);

#ifdef __cplusplus
}  /* end extern "C" */
#endif

#endif /* md5_INCLUDED */

#endif /* HAVE_SSL */