求MD5加密算法的C语言源码

如题，要求能编译成功的。

答案：（转载）
#include <stdio.h> 
#include <stdlib.h> 
#include <memory.h> 
#include <time.h> 
#include <errno.h> 
#include <string.h> 
#include <sys/socket.h> 
#include <sys/types.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include <netdb.h> 
#include "../md5/md5.h" 

#define T1 0xd76aa478 
#define T2 0xe8c7b756 
#define T3 0x242070db 
#define T4 0xc1bdceee 
#define T5 0xf57c0faf 
#define T6 0x4787c62a 
#define T7 0xa8304613 
#define T8 0xfd469501 
#define T9 0x698098d8 
#define T10 0x8b44f7af 
#define T11 0xffff5bb1 
#define T12 0x895cd7be 
#define T13 0x6b901122 
#define T14 0xfd987193 
#define T15 0xa679438e 
#define T16 0x49b40821 
#define T17 0xf61e2562 
#define T18 0xc040b340 
#define T19 0x265e5a51 
#define T20 0xe9b6c7aa 
#define T21 0xd62f105d 
#define T22 0x02441453 
#define T23 0xd8a1e681 
#define T24 0xe7d3fbc8 
#define T25 0x21e1cde6 
#define T26 0xc33707d6 
#define T27 0xf4d50d87 
#define T28 0x455a14ed 
#define T29 0xa9e3e905 
#define T30 0xfcefa3f8 
#define T31 0x676f02d9 
#define T32 0x8d2a4c8a 
#define T33 0xfffa3942 
#define T34 0x8771f681 
#define T35 0x6d9d6122 
#define T36 0xfde5380c 
#define T37 0xa4beea44 
#define T38 0x4bdecfa9 
#define T39 0xf6bb4b60 
#define T40 0xbebfbc70 
#define T41 0x289b7ec6 
#define T42 0xeaa127fa 
#define T43 0xd4ef3085 
#define T44 0x04881d05 
#define T45 0xd9d4d039 
#define T46 0xe6db99e5 
#define T47 0x1fa27cf8 
#define T48 0xc4ac5665 
#define T49 0xf4292244 
#define T50 0x432aff97 
#define T51 0xab9423a7 
#define T52 0xfc93a039 
#define T53 0x655b59c3 

#define T54 0x8f0ccc92 
#define T55 0xffeff47d 
#define T56 0x85845dd1 
#define T57 0x6fa87e4f 
#define T58 0xfe2ce6e0 
#define T59 0xa3014314 
#define T60 0x4e0811a1 
#define T61 0xf7537e82 
#define T62 0xbd3af235 
#define T63 0x2ad7d2bb 
#define T64 0xeb86d391 

static void md5_process(md5_state_t *pms, const md5_byte_t *data /*[64]*/) 
{ 
md5_word_t 
a = pms->abcd[0], b = pms->abcd[1], 
c = pms->abcd[2], d = pms->abcd[3]; 
md5_word_t t; 

#ifndef ARCH_IS_BIG_ENDIAN 
# define ARCH_IS_BIG_ENDIAN 1 /* slower, default implementation */ 
#endif 
#if ARCH_IS_BIG_ENDIAN 

/* 
* On big-endian machines, we must arrange the bytes in the right 
* order. (This also works on machines of unknown byte order.) 
*/ 
md5_word_t X[16]; 
const md5_byte_t *xp = data; 
int i; 

for (i = 0; i < 16; i, xp = 4) 
X[i] = xp[0] (xp[1] << 8) (xp[2] << 16) (xp[3] << 24); 

#else /* !ARCH_IS_BIG_ENDIAN */ 



/* 
* On little-endian machines, we can process properly aligned data 
* without copying it. 
*/ 
md5_word_t xbuf[16]; 
const md5_word_t *X; 

if (!((data - (const md5_byte_t *)0) & 3)) { 
/* data are properly aligned */ 
X = (const md5_word_t *)data; 
} else { 
/* not aligned */ 
memcpy(xbuf, data, 64); 
X = xbuf; 
} 
#endif 

#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n)))) 

/* Round 1. */ 
/* Let [abcd k s i] denote the operation 
a = b ((a F(b,c,d) X[k] T[i]) <<< s). */ 
#define F(x, y, z) (((x) & (y)) | (~(x) & (z))) 
#define SET(a, b, c, d, k, s, Ti)\ 
t = a F(b,c,d) X[k] Ti;\ 
a = ROTATE_LEFT(t, s) b 
/* Do the following 16 operations. */ 
SET(a, b, c, d, 0, 7, T1); 
SET(d, a, b, c, 1, 12, T2); 
SET(c, d, a, b, 2, 17, T3); 
SET(b, c, d, a, 3, 22, T4); 
SET(a, b, c, d, 4, 7, T5); 
SET(d, a, b, c, 5, 12, T6); 
SET(c, d, a, b, 6, 17, T7); 


SET(b, c, d, a, 7, 22, T8); 
SET(a, b, c, d, 8, 7, T9); 
SET(d, a, b, c, 9, 12, T10); 
SET(c, d, a, b, 10, 17, T11); 
SET(b, c, d, a, 11, 22, T12); 
SET(a, b, c, d, 12, 7, T13); 
SET(d, a, b, c, 13, 12, T14); 
SET(c, d, a, b, 14, 17, T15); 
SET(b, c, d, a, 15, 22, T16); 
#undef SET 

/* Round 2. */ 
/* Let [abcd k s i] denote the operation 
a = b ((a G(b,c,d) X[k] T[i]) <<< s). */ 
#define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) 
#define SET(a, b, c, d, k, s, Ti)\ 
t = a G(b,c,d) X[k] Ti;\ 
a = ROTATE_LEFT(t, s) b 
/* Do the following 16 operations. */ 
SET(a, b, c, d, 1, 5, T17); 
SET(d, a, b, c, 6, 9, T18); 
SET(c, d, a, b, 11, 14, T19); 
SET(b, c, d, a, 0, 20, T20); 
SET(a, b, c, d, 5, 5, T21); 
SET(d, a, b, c, 10, 9, T22); 
SET(c, d, a, b, 15, 14, T23); 
SET(b, c, d, a, 4, 20, T24); 
SET(a, b, c, d, 9, 5, T25); 
SET(d, a, b, c, 14, 9, T26); 
SET(c, d, a, b, 3, 14, T27); 
SET(b, c, d, a, 8, 20, T28); 
SET(a, b, c, d, 13, 5, T29); 
SET(d, a, b, c, 2, 9, T30); 
SET(c, d, a, b, 7, 14, T31); 
SET(b, c, d, a, 12, 20, T32); 
#undef SET

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