www.pudn.com > cbb_md5.rar > md5.h
/*************************************************************************
Copyright (C), 1995-2006, Jiaxun Feihong Electrical Co., Ltd.
File name: md5.h
CBB模块:MD5摘要功能，MD5和计算
接口函数:
void md5_init_ctx (struct md5_ctx *ctx)
功能:
初始化ctx结构
参数:
struct md5_ctx *ctx:MD5结构，用于存储计算状态
返回值:
无；
void md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx)
功能:
md5计算
参数:
const void *buffer:源数据；
size_t len:数据长度；
struct md5_ctx *ctx:MD5结构，用于存储计算状态
返回值:
无；
void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf)
功能:
结束计算，输出结果
参数:
struct md5_ctx *ctx:MD5结构，用于存储计算状态
void *resbuf:计算结果
返回值:
resbuf
使用说明:
struct md5_ctx ctx;
md5_init_ctx (&ctx);
md5_process_bytes (源数据, 数据长度, &ctx);
md5_process_bytes (密钥, 密钥长度, &ctx);
md5_finish_ctx (&ctx, MD5摘要);
version: 1.0
Date: 2006.11.10
***********************************************************************/
#ifndef _MD5_H
#define _MD5_H 1
#include
#if defined HAVE_LIMITS_H || _LIBC
# include
#endif
/* The following contortions are an attempt to use the C preprocessor
to determine an unsigned integral type that is 32 bits wide. An
alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
doing that would require that the configure script compile and *run*
the resulting executable. Locally running cross-compiled executables
is usually not possible. */
#ifdef _LIBC
# include
typedef u_int32_t md5_uint32;
#else
# if defined __STDC__ && __STDC__
# define UINT_MAX_32_BITS 4294967295U
# else
# define UINT_MAX_32_BITS 0xFFFFFFFF
# endif
/* If UINT_MAX isn't defined, assume it's a 32-bit type.
This should be valid for all systems GNU cares about because
that doesn't include 16-bit systems, and only modern systems
(that certainly have ) have 64+-bit integral types. */
# ifndef UINT_MAX
# define UINT_MAX UINT_MAX_32_BITS
# endif
# if UINT_MAX == UINT_MAX_32_BITS
typedef unsigned int md5_uint32;
# else
# if USHRT_MAX == UINT_MAX_32_BITS
typedef unsigned short md5_uint32;
# else
# if ULONG_MAX == UINT_MAX_32_BITS
typedef unsigned long md5_uint32;
# else
/* The following line is intended to evoke an error.
Using #error is not portable enough. */
"Cannot determine unsigned 32-bit data type."
# endif
# endif
# endif
#endif
#undef __P
#if defined (__STDC__) && __STDC__
# define __P(x) x
#else
# define __P(x) ()
#endif
/* Structure to save state of computation between the single steps. */
struct md5_ctx
{
md5_uint32 A;
md5_uint32 B;
md5_uint32 C;
md5_uint32 D;
md5_uint32 total[2];
md5_uint32 buflen;
char buffer[128];
};
/*
* The following three functions are build up the low level used in
* the functions `md5_stream' and `md5_buffer'.
*/
/* Initialize structure containing state of computation.
(RFC 1321, 3.3: Step 3) */
extern void __md5_init_ctx __P ((struct md5_ctx *ctx));
extern void md5_init_ctx __P ((struct md5_ctx *ctx));
/* Starting with the result of former calls of this function (or the
initialization function update the context for the next LEN bytes
starting at BUFFER.
It is necessary that LEN is a multiple of 64!!! */
extern void __md5_process_block __P ((const void *buffer, size_t len,
struct md5_ctx *ctx));
extern void md5_process_block __P ((const void *buffer, size_t len,
struct md5_ctx *ctx));
/* Starting with the result of former calls of this function (or the
initialization function update the context for the next LEN bytes
starting at BUFFER.
It is NOT required that LEN is a multiple of 64. */
extern void __md5_process_bytes __P ((const void *buffer, size_t len,
struct md5_ctx *ctx));
extern void md5_process_bytes __P ((const void *buffer, size_t len,
struct md5_ctx *ctx));
/* Process the remaining bytes in the buffer and put result from CTX
in first 16 bytes following RESBUF. The result is always in little
endian byte order, so that a byte-wise output yields to the wanted
ASCII representation of the message digest.
IMPORTANT: On some systems it is required that RESBUF is correctly
aligned for a 32 bits value. */
extern void *__md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
/* Put result from CTX in first 16 bytes following RESBUF. The result is
always in little endian byte order, so that a byte-wise output yields
to the wanted ASCII representation of the message digest.
IMPORTANT: On some systems it is required that RESBUF is correctly
aligned for a 32 bits value. */
extern void *__md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
/* Compute MD5 message digest for bytes read from STREAM. The
resulting message digest number will be written into the 16 bytes
beginning at RESBLOCK. */
extern int __md5_stream __P ((FILE *stream, void *resblock));
/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
result is always in little endian byte order, so that a byte-wise
output yields to the wanted ASCII representation of the message
digest. */
extern void *__md5_buffer __P ((const char *buffer, size_t len,
void *resblock));
extern void *md5_buffer __P ((const char *buffer, size_t len,
void *resblock));
#endif /* md5.h */