md5整理

MD5 是一个非常常用的算法,用于数字验证等很多方面,但是很多人只是想用这个算法,并不要求很了解其中的算法.其中也包括我在内,不过其实我也有适当的了解的.这里我就从Linux 2.6.36 中摘取出MD5部分并适当的修改了下,希望能对新手们有帮助,下面贴出代码:

MD5.h

#ifndef __HH_MD5_H_HH__#define __HH_MD5_H_HH__#include <string.h>#define MD5_DIGEST_SIZE16#define MD5_HMAC_BLOCK_SIZE64#define MD5_BLOCK_WORDS16#define MD5_HASH_WORDS4typedef unsigned charu8;typedef unsigned shortu16;typedef unsigned intu32;typedef unsigned long intu64;typedef struct md5_state {u32 hash[MD5_HASH_WORDS];u32 block[MD5_BLOCK_WORDS];u64 byte_count;}MD5_STATE;/*名称:md5_init功能:初始化MD5参数:输入:1:struct md5_state *desc;MD5结构体返回值:return 0;*/int md5_init(struct md5_state *desc);/*名称:md5_update功能:初始化MD5参数:输入:1:struct md5_state *descMD5结构体2:const u8 *data数据指针3:unsigned int len数据长度返回值:return 0;*/int md5_update(struct md5_state *desc, const u8 *data, unsigned int len);/*名称:md5_final功能:获取结果参数:输入:1:struct md5_state *descMD5结构体输出:2:u8 *out结果.长度为16eg.u8 out[16];返回值:return 0;*/int md5_final(struct md5_state *desc, u8 *out);/*名称:md5_cale功能:计算data指向的数据的MD5值,直接返回在out数组内参数:输入:1:const u8 *data数据指针2:unsigned int len数据长度输出:3:u8 *out结果.长度为16eg.u8 out[16];返回值:return 0;*/int md5_cale(const u8 *data, unsigned int len,u8 *out);#endif md5.c/*文件md5.c日期:2012-04-11 20:09作者:LvApp功能:MD5加密用法:1:实例变量 struct md5_state state;2:初始化md5_init(&state);3:MS5计算md5_update(&state,(u8*)"",strlen(""));4:结果md5_final(&state,res);维护:2012-04-11 20:091:从Linux内核中移植出来结果：测试正常2012-04-11 20:541:增加md5_calc函数接口,用于直接计算并返回.方便计算结果:测试正常*/

MD5.c

#include "md5.h"#define F1(x, y, z)(z ^ (x & (y ^ z)))#define F2(x, y, z)F1(z, x, y)#define F3(x, y, z)(x ^ y ^ z)#define F4(x, y, z)(y ^ (x | ~z))#define MD5STEP(f, w, x, y, z, in, s) \(w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)/*名称:md5_transform功能:MD5四轮运算,用于完成MD5主要计算部分参数:输入:1:u32 *hash, 密钥2:u32 const *in加密数据返回值:无*/void md5_transform(u32 *hash, u32 const *in){u32 a, b, c, d;a = hash[0];b = hash[1];c = hash[2];d = hash[3];MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);hash[0] += a;hash[1] += b;hash[2] += c;hash[3] += d;}/*名称:md5_init功能:初始化MD5参数:输入:1:struct md5_state *desc;MD5结构体返回值:return 0;*/int md5_init(struct md5_state *desc){struct md5_state *mctx = desc;mctx->hash[0] = 0x67452301;mctx->hash[1] = 0xefcdab89;mctx->hash[2] = 0x98badcfe;mctx->hash[3] = 0x10325476;mctx->byte_count = 0;return 0;}/*名称:md5_update功能:初始化MD5参数:输入:1:struct md5_state *descMD5结构体2:const u8 *data数据指针3:unsigned int len数据长度返回值:return 0;*/int md5_update(struct md5_state *desc, const u8 *data, unsigned int len){struct md5_state *mctx = desc;const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);mctx->byte_count += len;if (avail > len) {memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),data, len);return 0;}memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),       data, avail);md5_transform(mctx->hash, mctx->block);data += avail;len -= avail;while (len >= sizeof(mctx->block)) {memcpy(mctx->block, data, sizeof(mctx->block));md5_transform(mctx->hash, mctx->block);data += sizeof(mctx->block);len -= sizeof(mctx->block);}memcpy(mctx->block, data, len);return 0;}/*名称:md5_final功能:获取结果参数:输入:1:struct md5_state *descMD5结构体输出:2:u8 *out结果.长度为16eg.u8 out[16];返回值:return 0;*/int md5_final(struct md5_state *desc, u8 *out){struct md5_state *mctx = desc;const unsigned int offset = mctx->byte_count & 0x3f;char *p = (char *)mctx->block + offset;int padding = 56 - (offset + 1);*p++ = (char)0x80;if (padding < 0) {memset(p, 0x00, padding + sizeof (u64));md5_transform(mctx->hash, mctx->block);p = (char *)mctx->block;padding = 56;}memset(p, 0, padding);mctx->block[14] = mctx->byte_count << 3;mctx->block[15] = mctx->byte_count >> 29;md5_transform(mctx->hash, mctx->block);memcpy(out, mctx->hash, sizeof(mctx->hash));memset(mctx, 0, sizeof(*mctx));return 0;}/*名称:md5_cale功能:计算data指向的数据的MD5值,直接返回在out数组内参数:输入:1:const u8 *data数据指针2:unsigned int len数据长度输出:3:u8 *out结果.长度为16eg.u8 out[16];返回值:return 0;*/int md5_cale(const u8 *data, unsigned int len,u8 *out){struct md5_state state;md5_init(&state);md5_update(&state,data,len);md5_final(&state,out);return 0;}

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