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MD5算法C语言版本

C语言 smallfish 265℃ 0评论

MD5的算法在网上可以找到很多,这里通过http://blog.csdn.net/xhhjin/article/details/8450686 找到了RSA Data Security, Inc. 的一份源码。非常感谢原作者与该文作者。源码所有权归原作者,本文仅作分析用。

源码包含三个文件,分别为:md5.h/md5.c/main.c,其中main.c为测试文件。源码如下所示。

/* 
 ********************************************************************** 
 ** md5.h -- Header file for implementation of MD5                   ** 
 ** RSA Data Security, Inc. MD5 Message Digest Algorithm             ** 
 ** Created: 2/17/90 RLR                                             ** 
 ** Revised: 12/27/90 SRD,AJ,BSK,JT Reference C version              ** 
 ** Revised (for MD5): RLR 4/27/91                                   ** 
 **   -- G modified to have y&~z instead of y&z                      ** 
 **   -- FF, GG, HH modified to add in last register done            ** 
 **   -- Access pattern: round 2 works mod 5, round 3 works mod 3    ** 
 **   -- distinct additive constant for each step                    ** 
 **   -- round 4 added, working mod 7                                ** 
 ********************************************************************** 
 */  
  
/* 
 ********************************************************************** 
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 
 **                                                                  ** 
 ** License to copy and use this software is granted provided that   ** 
 ** it is identified as the "RSA Data Security, Inc. MD5 Message     ** 
 ** Digest Algorithm" in all material mentioning or referencing this ** 
 ** software or this function.                                       ** 
 **                                                                  ** 
 ** License is also granted to make and use derivative works         ** 
 ** provided that such works are identified as "derived from the RSA ** 
 ** Data Security, Inc. MD5 Message Digest Algorithm" in all         ** 
 ** material mentioning or referencing the derived work.             ** 
 **                                                                  ** 
 ** RSA Data Security, Inc. makes no representations concerning      ** 
 ** either the merchantability of this software or the suitability   ** 
 ** of this software for any particular purpose.  It is provided "as ** 
 ** is" without express or implied warranty of any kind.             ** 
 **                                                                  ** 
 ** These notices must be retained in any copies of any part of this ** 
 ** documentation and/or software.                                   ** 
 ********************************************************************** 
 */  
  
/* typedef a 32 bit type */  
typedef unsigned long int UINT4;  
  
/* Data structure for MD5 (Message Digest) computation */  
typedef struct {  
  UINT4 i[2];                   /* number of _bits_ handled mod 2^64 */  
  UINT4 buf[4];                                    /* scratch buffer */  
  unsigned char in[64];                              /* input buffer */  
  unsigned char digest[16];     /* actual digest after MD5Final call */  
} MD5_CTX;  
  
void MD5Init (MD5_CTX *mdContext);  
void MD5Update (MD5_CTX *mdContext, char *inBuf, unsigned int inLen);  
void MD5Final (MD5_CTX *mdContext);  
void Transform (UINT4 *buf, UINT4 *in);  
  
/* 
 ********************************************************************** 
 ** End of md5.h                                                     ** 
 ******************************* (cut) ******************************** 
 */
/* 
 ********************************************************************** 
 ** md5.c                                                            ** 
 ** RSA Data Security, Inc. MD5 Message Digest Algorithm             ** 
 ** Created: 2/17/90 RLR                                             ** 
 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version                  ** 
 ********************************************************************** 
 */  
  
/* 
 ********************************************************************** 
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 
 **                                                                  ** 
 ** License to copy and use this software is granted provided that   ** 
 ** it is identified as the "RSA Data Security, Inc. MD5 Message     ** 
 ** Digest Algorithm" in all material mentioning or referencing this ** 
 ** software or this function.                                       ** 
 **                                                                  ** 
 ** License is also granted to make and use derivative works         ** 
 ** provided that such works are identified as "derived from the RSA ** 
 ** Data Security, Inc. MD5 Message Digest Algorithm" in all         ** 
 ** material mentioning or referencing the derived work.             ** 
 **                                                                  ** 
 ** RSA Data Security, Inc. makes no representations concerning      ** 
 ** either the merchantability of this software or the suitability   ** 
 ** of this software for any particular purpose.  It is provided "as ** 
 ** is" without express or implied warranty of any kind.             ** 
 **                                                                  ** 
 ** These notices must be retained in any copies of any part of this ** 
 ** documentation and/or software.                                   ** 
 ********************************************************************** 
 */  
  
/* -- include the following line if the md5.h header file is separate -- */  
#include "md5.h"  
  
/* forward declaration */  
  
static unsigned char PADDING[64] = {  
  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00  
};  
  
/* F, G and H are basic MD5 functions: selection, majority, parity */  
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))  
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))  
#define H(x, y, z) ((x) ^ (y) ^ (z))  
#define I(x, y, z) ((y) ^ ((x) | (~z)))  
  
/* ROTATE_LEFT rotates x left n bits */  
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))  
  
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */  
/* Rotation is separate from addition to prevent recomputation */  
#define FF(a, b, c, d, x, s, ac) \  
  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \  
   (a) = ROTATE_LEFT ((a), (s)); \  
   (a) += (b); \  
  }  
#define GG(a, b, c, d, x, s, ac) \  
  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \  
   (a) = ROTATE_LEFT ((a), (s)); \  
   (a) += (b); \  
  }  
#define HH(a, b, c, d, x, s, ac) \  
  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \  
   (a) = ROTATE_LEFT ((a), (s)); \  
   (a) += (b); \  
  }  
#define II(a, b, c, d, x, s, ac) \  
  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \  
   (a) = ROTATE_LEFT ((a), (s)); \  
   (a) += (b); \  
  }  
  
void MD5Init(MD5_CTX *mdContext) {  
    mdContext->i[0] = mdContext->i[1] = (UINT4) 0;  
  
    /* Load magic initialization constants. 
     */  
    mdContext->buf[0] = (UINT4) 0x67452301;  
    mdContext->buf[1] = (UINT4) 0xefcdab89;  
    mdContext->buf[2] = (UINT4) 0x98badcfe;  
    mdContext->buf[3] = (UINT4) 0x10325476;  
}  
  
void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen) {  
    UINT4 in[16];  
    int mdi;  
    unsigned int i, ii;  
  
    /* compute number of bytes mod 64 */  
    mdi = (int) ((mdContext->i[0] >> 3) & 0x3F);  
  
    /* update number of bits */  
    if ((mdContext->i[0] + ((UINT4) inLen << 3)) < mdContext->i[0])  
        mdContext->i[1]++;  
    mdContext->i[0] += ((UINT4) inLen << 3);  
    mdContext->i[1] += ((UINT4) inLen >> 29);  
  
    while (inLen--) {  
        /* add new character to buffer, increment mdi */  
        mdContext->in[mdi++] = *inBuf++;  
  
        /* transform if necessary */  
        if (mdi == 0x40) {  
            for (i = 0, ii = 0; i < 16; i++, ii += 4)  
                in[i] = (((UINT4) mdContext->in[ii + 3]) << 24) | (((UINT4) mdContext->in[ii + 2]) << 16) | (((UINT4) mdContext->in[ii + 1]) << 8) | ((UINT4) mdContext->in[ii]);  
            Transform(mdContext->buf, in);  
            mdi = 0;  
        }  
    }  
}  
  
void MD5Final(MD5_CTX *mdContext) {  
    UINT4 in[16];  
    int mdi;  
    unsigned int i, ii;  
    unsigned int padLen;  
  
    /* save number of bits */  
    in[14] = mdContext->i[0];  
    in[15] = mdContext->i[1];  
  
    /* compute number of bytes mod 64 */  
    mdi = (int) ((mdContext->i[0] >> 3) & 0x3F);  
  
    /* pad out to 56 mod 64 */  
    padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);  
    MD5Update(mdContext, PADDING, padLen);  
  
    /* append length in bits and transform */  
    for (i = 0, ii = 0; i < 14; i++, ii += 4)  
        in[i] = (((UINT4) mdContext->in[ii + 3]) << 24) | (((UINT4) mdContext->in[ii + 2]) << 16) | (((UINT4) mdContext->in[ii + 1]) << 8) | ((UINT4) mdContext->in[ii]);  
    Transform(mdContext->buf, in);  
  
    /* store buffer in digest */  
    for (i = 0, ii = 0; i < 4; i++, ii += 4) {  
        mdContext->digest[ii] = (unsigned char) (mdContext->buf[i] & 0xFF);  
        mdContext->digest[ii + 1] = (unsigned char) ((mdContext->buf[i] >> 8) & 0xFF);  
        mdContext->digest[ii + 2] = (unsigned char) ((mdContext->buf[i] >> 16) & 0xFF);  
        mdContext->digest[ii + 3] = (unsigned char) ((mdContext->buf[i] >> 24) & 0xFF);  
    }  
}  
  
/* Basic MD5 step. Transform buf based on in. 
 */  
static void Transform (unsigned long int *buf, unsigned long int *in)  
{  
    unsigned long int a = buf[0], b = buf[1], c = buf[2], d = buf[3];  
  
  /* Round 1 */  
#define S11 7  
#define S12 12  
#define S13 17  
#define S14 22  
    FF(a, b, c, d, in[0], S11, 3614090360); /* 1 */  
    FF(d, a, b, c, in[1], S12, 3905402710); /* 2 */  
    FF(c, d, a, b, in[2], S13, 606105819); /* 3 */  
    FF(b, c, d, a, in[3], S14, 3250441966); /* 4 */  
    FF(a, b, c, d, in[4], S11, 4118548399); /* 5 */  
    FF(d, a, b, c, in[5], S12, 1200080426); /* 6 */  
    FF(c, d, a, b, in[6], S13, 2821735955); /* 7 */  
    FF(b, c, d, a, in[7], S14, 4249261313); /* 8 */  
    FF(a, b, c, d, in[8], S11, 1770035416); /* 9 */  
    FF(d, a, b, c, in[9], S12, 2336552879); /* 10 */  
    FF(c, d, a, b, in[10], S13, 4294925233); /* 11 */  
    FF(b, c, d, a, in[11], S14, 2304563134); /* 12 */  
    FF(a, b, c, d, in[12], S11, 1804603682); /* 13 */  
    FF(d, a, b, c, in[13], S12, 4254626195); /* 14 */  
    FF(c, d, a, b, in[14], S13, 2792965006); /* 15 */  
    FF(b, c, d, a, in[15], S14, 1236535329); /* 16 */  
  
  /* Round 2 */  
#define S21 5  
#define S22 9  
#define S23 14  
#define S24 20  
    GG(a, b, c, d, in[1], S21, 4129170786); /* 17 */  
    GG(d, a, b, c, in[6], S22, 3225465664); /* 18 */  
    GG(c, d, a, b, in[11], S23, 643717713); /* 19 */  
    GG(b, c, d, a, in[0], S24, 3921069994); /* 20 */  
    GG(a, b, c, d, in[5], S21, 3593408605); /* 21 */  
    GG(d, a, b, c, in[10], S22, 38016083); /* 22 */  
    GG(c, d, a, b, in[15], S23, 3634488961); /* 23 */  
    GG(b, c, d, a, in[4], S24, 3889429448); /* 24 */  
    GG(a, b, c, d, in[9], S21, 568446438); /* 25 */  
    GG(d, a, b, c, in[14], S22, 3275163606); /* 26 */  
    GG(c, d, a, b, in[3], S23, 4107603335); /* 27 */  
    GG(b, c, d, a, in[8], S24, 1163531501); /* 28 */  
    GG(a, b, c, d, in[13], S21, 2850285829); /* 29 */  
    GG(d, a, b, c, in[2], S22, 4243563512); /* 30 */  
    GG(c, d, a, b, in[7], S23, 1735328473); /* 31 */  
    GG(b, c, d, a, in[12], S24, 2368359562); /* 32 */  
  
  /* Round 3 */  
#define S31 4  
#define S32 11  
#define S33 16  
#define S34 23  
    HH(a, b, c, d, in[5], S31, 4294588738); /* 33 */  
    HH(d, a, b, c, in[8], S32, 2272392833); /* 34 */  
    HH(c, d, a, b, in[11], S33, 1839030562); /* 35 */  
    HH(b, c, d, a, in[14], S34, 4259657740); /* 36 */  
    HH(a, b, c, d, in[1], S31, 2763975236); /* 37 */  
    HH(d, a, b, c, in[4], S32, 1272893353); /* 38 */  
    HH(c, d, a, b, in[7], S33, 4139469664); /* 39 */  
    HH(b, c, d, a, in[10], S34, 3200236656); /* 40 */  
    HH(a, b, c, d, in[13], S31, 681279174); /* 41 */  
    HH(d, a, b, c, in[0], S32, 3936430074); /* 42 */  
    HH(c, d, a, b, in[3], S33, 3572445317); /* 43 */  
    HH(b, c, d, a, in[6], S34, 76029189); /* 44 */  
    HH(a, b, c, d, in[9], S31, 3654602809); /* 45 */  
    HH(d, a, b, c, in[12], S32, 3873151461); /* 46 */  
    HH(c, d, a, b, in[15], S33, 530742520); /* 47 */  
    HH(b, c, d, a, in[2], S34, 3299628645); /* 48 */  
  
  /* Round 4 */  
#define S41 6  
#define S42 10  
#define S43 15  
#define S44 21  
    II(a, b, c, d, in[0], S41, 4096336452); /* 49 */  
    II(d, a, b, c, in[7], S42, 1126891415); /* 50 */  
    II(c, d, a, b, in[14], S43, 2878612391); /* 51 */  
    II(b, c, d, a, in[5], S44, 4237533241); /* 52 */  
    II(a, b, c, d, in[12], S41, 1700485571); /* 53 */  
    II(d, a, b, c, in[3], S42, 2399980690); /* 54 */  
    II(c, d, a, b, in[10], S43, 4293915773); /* 55 */  
    II(b, c, d, a, in[1], S44, 2240044497); /* 56 */  
    II(a, b, c, d, in[8], S41, 1873313359); /* 57 */  
    II(d, a, b, c, in[15], S42, 4264355552); /* 58 */  
    II(c, d, a, b, in[6], S43, 2734768916); /* 59 */  
    II(b, c, d, a, in[13], S44, 1309151649); /* 60 */  
    II(a, b, c, d, in[4], S41, 4149444226); /* 61 */  
    II(d, a, b, c, in[11], S42, 3174756917); /* 62 */  
    II(c, d, a, b, in[2], S43, 718787259); /* 63 */  
    II(b, c, d, a, in[9], S44, 3951481745); /* 64 */  
  
    buf[0] += a;  
    buf[1] += b;  
    buf[2] += c;  
    buf[3] += d;  
}  
  
/* 
 ********************************************************************** 
 ** End of md5.c                                                     ** 
 ******************************* (cut) ******************************** 
 */
/* 
 ********************************************************************** 
 ** md5driver.c -- sample routines to test                           ** 
 ** RSA Data Security, Inc. MD5 message digest algorithm.            ** 
 ** Created: 2/16/90 RLR                                             ** 
 ** Updated: 1/91 SRD                                                ** 
 ********************************************************************** 
 */  
  
/* 
 ********************************************************************** 
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 
 **                                                                  ** 
 ** RSA Data Security, Inc. makes no representations concerning      ** 
 ** either the merchantability of this software or the suitability   ** 
 ** of this software for any particular purpose.  It is provided "as ** 
 ** is" without express or implied warranty of any kind.             ** 
 **                                                                  ** 
 ** These notices must be retained in any copies of any part of this ** 
 ** documentation and/or software.                                   ** 
 ********************************************************************** 
 */  
  
#include <stdio.h>  
#include <sys/types.h>  
#include <time.h>  
#include <string.h>  
/* -- include the following file if the file md5.h is separate -- */  
#include "md5.h"  
  
/* Prints message digest buffer in mdContext as 32 hexadecimal digits. 
 Order is from low-order byte to high-order byte of digest. 
 Each byte is printed with high-order hexadecimal digit first. 
 */  
static void MDPrint(MD5_CTX *mdContext) {  
    int i;  
  
    for (i = 0; i < 16; i++)  
        printf("%02x", mdContext->digest[i]);  
}  
  
/* size of test block */  
#define TEST_BLOCK_SIZE 1000  
  
/* number of blocks to process */  
#define TEST_BLOCKS 10000  
  
/* number of test bytes = TEST_BLOCK_SIZE * TEST_BLOCKS */  
static long TEST_BYTES = (long) TEST_BLOCK_SIZE * (long) TEST_BLOCKS;  
  
/* A time trial routine, to measure the speed of MD5. 
 Measures wall time required to digest TEST_BLOCKS * TEST_BLOCK_SIZE 
 characters. 
 */  
static void MDTimeTrial() {  
    MD5_CTX mdContext;  
    time_t endTime, startTime;  
    unsigned char data[TEST_BLOCK_SIZE];  
    unsigned int i;  
  
    /* initialize test data */  
    for (i = 0; i < TEST_BLOCK_SIZE; i++)  
        data[i] = (unsigned char) (i & 0xFF);  
  
    /* start timer */  
    printf("MD5 time trial. Processing %ld characters...\n", TEST_BYTES);  
    time(&startTime);  
  
    /* digest data in TEST_BLOCK_SIZE byte blocks */  
    MD5Init(&mdContext);  
    for (i = TEST_BLOCKS; i > 0; i--)  
        MD5Update(&mdContext, data, TEST_BLOCK_SIZE);  
    MD5Final(&mdContext);  
  
    /* stop timer, get time difference */  
    time(&endTime);  
    MDPrint(&mdContext);  
    printf(" is digest of test input.\n");  
    printf("Seconds to process test input: %ld\n", (long) (endTime - startTime));  
    printf("Characters processed per second: %ld\n", TEST_BYTES / (endTime - startTime));  
}  
  
/* Computes the message digest for string inString. 
 Prints out message digest, a space, the string (in quotes) and a 
 carriage return. 
 */  
static void MDString(char *inString) {  
    MD5_CTX mdContext;  
    unsigned int len = strlen(inString);  
  
    MD5Init(&mdContext);  
    MD5Update(&mdContext, inString, len);  
    MD5Final(&mdContext);  
    MDPrint(&mdContext);  
    printf(" \"%s\"\n\n", inString);  
}  
  
/* Computes the message digest for a specified file. 
 Prints out message digest, a space, the file name, and a carriage 
 return. 
 */  
static void MDFile(char *filename) {  
    FILE *inFile = fopen(filename, "rb");  
    MD5_CTX mdContext;  
    int bytes;  
    char data[1024];  
  
    if (inFile == NULL) {  
        printf("%s can't be opened.\n", filename);  
        return;  
    }  
  
    MD5Init(&mdContext);  
    while ((bytes = fread(data, 1, 1024, inFile)) != 0)  
        MD5Update(&mdContext, data, bytes);  
    MD5Final(&mdContext);  
    MDPrint(&mdContext);  
    printf(" %s\n", filename);  
    fclose(inFile);  
}  
  
/* Writes the message digest of the data from stdin onto stdout, 
 followed by a carriage return. 
 */  
static void MDFilter() {  
    MD5_CTX mdContext;  
    int bytes;  
    char data[16];  
  
    MD5Init(&mdContext);  
    while ((bytes = fread(data, 1, 16, stdin)) != 0)  
        MD5Update(&mdContext, data, bytes);  
    MD5Final(&mdContext);  
    MDPrint(&mdContext);  
    printf("\n");  
}  
  
/* Runs a standard suite of test data. 
 */  
static void MDTestSuite() {  
    printf("MD5 test suite results:\n\n");  
    MDString("");  
    MDString("a");  
    MDString("abc");  
    MDString("message digest");  
    MDString("abcdefghijklmnopqrstuvwxyz");  
    MDString("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");  
    MDString("1234567890123456789012345678901234567890\  
1234567890123456789012345678901234567890");  
    /* Contents of file foo are "abc" */  
    MDFile("foo");  
}  
  
void main(int argc, char *argv[]) {  
    int i;  
  
    /* For each command line argument in turn: 
     ** filename          -- prints message digest and name of file 
     ** -sstring          -- prints message digest and contents of string 
     ** -t                -- prints time trial statistics for 1M characters 
     ** -x                -- execute a standard suite of test data 
     ** (no args)         -- writes messages digest of stdin onto stdout 
     */  
    if (argc == 1) {  
        MDFilter();  
    } else {  
        for (i = 1; i < argc; i++) {  
            if (argv[i][0] == '-' && argv[i][1] == 's') {  
                MDString(argv[i] + 2);  
            } else if (strcmp(argv[i], "-t") == 0) {  
                MDTimeTrial();  
            } else if (strcmp(argv[i], "-x") == 0) {  
                MDTestSuite();  
            } else {  
                MDFile(argv[i]);  
            }  
        }  
    }  
}  
  
/* 
 ********************************************************************** 
 ** End of md5driver.c                                               ** 
 ******************************* (cut) ******************************** 
 */

此文件几乎可以直接使用,但编译中会有些问题,需要作一些修改。修改后的文件如下:

/*
 **********************************************************************
 ** md5.h -- Header file for implementation of MD5                   **
 ** RSA Data Security, Inc. MD5 Message Digest Algorithm             **
 ** Created: 2/17/90 RLR                                             **
 ** Revised: 12/27/90 SRD,AJ,BSK,JT Reference C version              **
 ** Revised (for MD5): RLR 4/27/91                                   **
 **   -- G modified to have y&~z instead of y&z                      **
 **   -- FF, GG, HH modified to add in last register done            **
 **   -- Access pattern: round 2 works mod 5, round 3 works mod 3    **
 **   -- distinct additive constant for each step                    **
 **   -- round 4 added, working mod 7                                **
 **********************************************************************
 */

/*
 **********************************************************************
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
 **                                                                  **
 ** License to copy and use this software is granted provided that   **
 ** it is identified as the "RSA Data Security, Inc. MD5 Message     **
 ** Digest Algorithm" in all material mentioning or referencing this **
 ** software or this function.                                       **
 **                                                                  **
 ** License is also granted to make and use derivative works         **
 ** provided that such works are identified as "derived from the RSA **
 ** Data Security, Inc. MD5 Message Digest Algorithm" in all         **
 ** material mentioning or referencing the derived work.             **
 **                                                                  **
 ** RSA Data Security, Inc. makes no representations concerning      **
 ** either the merchantability of this software or the suitability   **
 ** of this software for any particular purpose.  It is provided "as **
 ** is" without express or implied warranty of any kind.             **
 **                                                                  **
 ** These notices must be retained in any copies of any part of this **
 ** documentation and/or software.                                   **
 **********************************************************************
 */

/* typedef a 32 bit type */
typedef unsigned int UINT4;

/* Data structure for MD5 (Message Digest) computation */
typedef struct {
  UINT4 i[2];                   /* number of _bits_ handled mod 2^64 */
  UINT4 buf[4];                                    /* scratch buffer */
  unsigned char in[64];                              /* input buffer */
  unsigned char digest[16];     /* actual digest after MD5Final call */
} MD5_CTX;

void MD5Init (MD5_CTX *mdContext);
void MD5Update (MD5_CTX *mdContext, char *inBuf, UINT4 inLen);
void MD5Final (MD5_CTX *mdContext);

/*
 **********************************************************************
 ** End of md5.h                                                     **
 ******************************* (cut) ********************************
 */
/*
 **********************************************************************
 ** md5.c                                                            **
 ** RSA Data Security, Inc. MD5 Message Digest Algorithm             **
 ** Created: 2/17/90 RLR                                             **
 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version                  **
 **********************************************************************
 */

/*
 **********************************************************************
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
 **                                                                  **
 ** License to copy and use this software is granted provided that   **
 ** it is identified as the "RSA Data Security, Inc. MD5 Message     **
 ** Digest Algorithm" in all material mentioning or referencing this **
 ** software or this function.                                       **
 **                                                                  **
 ** License is also granted to make and use derivative works         **
 ** provided that such works are identified as "derived from the RSA **
 ** Data Security, Inc. MD5 Message Digest Algorithm" in all         **
 ** material mentioning or referencing the derived work.             **
 **                                                                  **
 ** RSA Data Security, Inc. makes no representations concerning      **
 ** either the merchantability of this software or the suitability   **
 ** of this software for any particular purpose.  It is provided "as **
 ** is" without express or implied warranty of any kind.             **
 **                                                                  **
 ** These notices must be retained in any copies of any part of this **
 ** documentation and/or software.                                   **
 **********************************************************************
 */

/* -- include the following line if the md5.h header file is separate -- */
#include "md5.h"

/* forward declaration */

static unsigned char PADDING[64] = {
  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

/* F, G and H are basic MD5 functions: selection, majority, parity */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
/* Rotation is separate from addition to prevent recomputation */
#define FF(a, b, c, d, x, s, ac) \
  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) \
  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) \
  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) \
  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }

void MD5Init(MD5_CTX *mdContext) {
    mdContext->i[0] = mdContext->i[1] = (UINT4) 0;

    /* Load magic initialization constants.
     */
    mdContext->buf[0] = (UINT4) 0x67452301;
    mdContext->buf[1] = (UINT4) 0xefcdab89;
    mdContext->buf[2] = (UINT4) 0x98badcfe;
    mdContext->buf[3] = (UINT4) 0x10325476;
}

/* Basic MD5 step. Transform buf based on in.
 */
static void Transform (UINT4 *buf, UINT4 *in)
{
    UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];

    /* Round 1 */
    #define S11 7
    #define S12 12
    #define S13 17
    #define S14 22
    FF(a, b, c, d, in[0], S11, 3614090360); /* 1 */
    FF(d, a, b, c, in[1], S12, 3905402710); /* 2 */
    FF(c, d, a, b, in[2], S13, 606105819); /* 3 */
    FF(b, c, d, a, in[3], S14, 3250441966); /* 4 */
    FF(a, b, c, d, in[4], S11, 4118548399); /* 5 */
    FF(d, a, b, c, in[5], S12, 1200080426); /* 6 */
    FF(c, d, a, b, in[6], S13, 2821735955); /* 7 */
    FF(b, c, d, a, in[7], S14, 4249261313); /* 8 */
    FF(a, b, c, d, in[8], S11, 1770035416); /* 9 */
    FF(d, a, b, c, in[9], S12, 2336552879); /* 10 */
    FF(c, d, a, b, in[10], S13, 4294925233); /* 11 */
    FF(b, c, d, a, in[11], S14, 2304563134); /* 12 */
    FF(a, b, c, d, in[12], S11, 1804603682); /* 13 */
    FF(d, a, b, c, in[13], S12, 4254626195); /* 14 */
    FF(c, d, a, b, in[14], S13, 2792965006); /* 15 */
    FF(b, c, d, a, in[15], S14, 1236535329); /* 16 */

    /* Round 2 */
    #define S21 5
    #define S22 9
    #define S23 14
    #define S24 20
    GG(a, b, c, d, in[1], S21, 4129170786); /* 17 */
    GG(d, a, b, c, in[6], S22, 3225465664); /* 18 */
    GG(c, d, a, b, in[11], S23, 643717713); /* 19 */
    GG(b, c, d, a, in[0], S24, 3921069994); /* 20 */
    GG(a, b, c, d, in[5], S21, 3593408605); /* 21 */
    GG(d, a, b, c, in[10], S22, 38016083); /* 22 */
    GG(c, d, a, b, in[15], S23, 3634488961); /* 23 */
    GG(b, c, d, a, in[4], S24, 3889429448); /* 24 */
    GG(a, b, c, d, in[9], S21, 568446438); /* 25 */
    GG(d, a, b, c, in[14], S22, 3275163606); /* 26 */
    GG(c, d, a, b, in[3], S23, 4107603335); /* 27 */
    GG(b, c, d, a, in[8], S24, 1163531501); /* 28 */
    GG(a, b, c, d, in[13], S21, 2850285829); /* 29 */
    GG(d, a, b, c, in[2], S22, 4243563512); /* 30 */
    GG(c, d, a, b, in[7], S23, 1735328473); /* 31 */
    GG(b, c, d, a, in[12], S24, 2368359562); /* 32 */

    /* Round 3 */
    #define S31 4
    #define S32 11
    #define S33 16
    #define S34 23
    HH(a, b, c, d, in[5], S31, 4294588738); /* 33 */
    HH(d, a, b, c, in[8], S32, 2272392833); /* 34 */
    HH(c, d, a, b, in[11], S33, 1839030562); /* 35 */
    HH(b, c, d, a, in[14], S34, 4259657740); /* 36 */
    HH(a, b, c, d, in[1], S31, 2763975236); /* 37 */
    HH(d, a, b, c, in[4], S32, 1272893353); /* 38 */
    HH(c, d, a, b, in[7], S33, 4139469664); /* 39 */
    HH(b, c, d, a, in[10], S34, 3200236656); /* 40 */
    HH(a, b, c, d, in[13], S31, 681279174); /* 41 */
    HH(d, a, b, c, in[0], S32, 3936430074); /* 42 */
    HH(c, d, a, b, in[3], S33, 3572445317); /* 43 */
    HH(b, c, d, a, in[6], S34, 76029189); /* 44 */
    HH(a, b, c, d, in[9], S31, 3654602809); /* 45 */
    HH(d, a, b, c, in[12], S32, 3873151461); /* 46 */
    HH(c, d, a, b, in[15], S33, 530742520); /* 47 */
    HH(b, c, d, a, in[2], S34, 3299628645); /* 48 */

    /* Round 4 */
    #define S41 6
    #define S42 10
    #define S43 15
    #define S44 21
    II(a, b, c, d, in[0], S41, 4096336452); /* 49 */
    II(d, a, b, c, in[7], S42, 1126891415); /* 50 */
    II(c, d, a, b, in[14], S43, 2878612391); /* 51 */
    II(b, c, d, a, in[5], S44, 4237533241); /* 52 */
    II(a, b, c, d, in[12], S41, 1700485571); /* 53 */
    II(d, a, b, c, in[3], S42, 2399980690); /* 54 */
    II(c, d, a, b, in[10], S43, 4293915773); /* 55 */
    II(b, c, d, a, in[1], S44, 2240044497); /* 56 */
    II(a, b, c, d, in[8], S41, 1873313359); /* 57 */
    II(d, a, b, c, in[15], S42, 4264355552); /* 58 */
    II(c, d, a, b, in[6], S43, 2734768916); /* 59 */
    II(b, c, d, a, in[13], S44, 1309151649); /* 60 */
    II(a, b, c, d, in[4], S41, 4149444226); /* 61 */
    II(d, a, b, c, in[11], S42, 3174756917); /* 62 */
    II(c, d, a, b, in[2], S43, 718787259); /* 63 */
    II(b, c, d, a, in[9], S44, 3951481745); /* 64 */

    buf[0] += a;
    buf[1] += b;
    buf[2] += c;
    buf[3] += d;
}

void MD5Update(MD5_CTX *mdContext, char *inBuf, UINT4 inLen) {
    UINT4 in[16];
    int mdi;
    unsigned int i, ii;

    /* compute number of bytes mod 64 */
    mdi = (int) ((mdContext->i[0] >> 3) & 0x3F);

    /* update number of bits */
    if ((mdContext->i[0] + ((UINT4) inLen << 3)) < mdContext->i[0])
        mdContext->i[1]++;
    mdContext->i[0] += ((UINT4) inLen << 3);
    mdContext->i[1] += ((UINT4) inLen >> 29);

    while (inLen--) {
        /* add new character to buffer, increment mdi */
        mdContext->in[mdi++] = *inBuf++;

        /* transform if necessary */
        if (mdi == 0x40) {
            for (i = 0, ii = 0; i < 16; i++, ii += 4)
                in[i] = (((UINT4) mdContext->in[ii + 3]) << 24) | (((UINT4) mdContext->in[ii + 2]) << 16) | (((UINT4) mdContext->in[ii + 1]) << 8) | ((UINT4) mdContext->in[ii]);
            Transform(mdContext->buf, in);
            mdi = 0;
        }
    }
}

void MD5Final(MD5_CTX *mdContext) {
    UINT4 in[16];
    int mdi;
    unsigned int i, ii;
    unsigned int padLen;

    /* save number of bits */
    in[14] = mdContext->i[0];
    in[15] = mdContext->i[1];

    /* compute number of bytes mod 64 */
    mdi = (int) ((mdContext->i[0] >> 3) & 0x3F);

    /* pad out to 56 mod 64 */
    padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
    MD5Update(mdContext, (char *)PADDING, padLen);

    /* append length in bits and transform */
    for (i = 0, ii = 0; i < 14; i++, ii += 4)
        in[i] = (((UINT4) mdContext->in[ii + 3]) << 24) | (((UINT4) mdContext->in[ii + 2]) << 16) | (((UINT4) mdContext->in[ii + 1]) << 8) | ((UINT4) mdContext->in[ii]);
    Transform(mdContext->buf, in);

    /* store buffer in digest */
    for (i = 0, ii = 0; i < 4; i++, ii += 4) {
        mdContext->digest[ii] = (unsigned char) (mdContext->buf[i] & 0xFF);
        mdContext->digest[ii + 1] = (unsigned char) ((mdContext->buf[i] >> 8) & 0xFF);
        mdContext->digest[ii + 2] = (unsigned char) ((mdContext->buf[i] >> 16) & 0xFF);
        mdContext->digest[ii + 3] = (unsigned char) ((mdContext->buf[i] >> 24) & 0xFF);
    }
}

/*
 **********************************************************************
 ** End of md5.c                                                     **
 ******************************* (cut) ********************************
 */
/*
 **********************************************************************
 ** md5driver.c -- sample routines to test                           **
 ** RSA Data Security, Inc. MD5 message digest algorithm.            **
 ** Created: 2/16/90 RLR                                             **
 ** Updated: 1/91 SRD                                                **
 **********************************************************************
 */

/*
 **********************************************************************
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
 **                                                                  **
 ** RSA Data Security, Inc. makes no representations concerning      **
 ** either the merchantability of this software or the suitability   **
 ** of this software for any particular purpose.  It is provided "as **
 ** is" without express or implied warranty of any kind.             **
 **                                                                  **
 ** These notices must be retained in any copies of any part of this **
 ** documentation and/or software.                                   **
 **********************************************************************
 */

#include <stdio.h>
#include <sys/types.h>
#include <time.h>
#include <string.h>
/* -- include the following file if the file md5.h is separate -- */
#include "md5.h"

/* Prints message digest buffer in mdContext as 32 hexadecimal digits.
 Order is from low-order byte to high-order byte of digest.
 Each byte is printed with high-order hexadecimal digit first.
 */
static void MDPrint(MD5_CTX *mdContext) {
    int i;

    for (i = 0; i < 16; i++)
        printf("%02x", mdContext->digest[i]);
}

/* size of test block */
#define TEST_BLOCK_SIZE 1000

/* number of blocks to process */
#define TEST_BLOCKS 10000

/* number of test bytes = TEST_BLOCK_SIZE * TEST_BLOCKS */
static long TEST_BYTES = (long) TEST_BLOCK_SIZE * (long) TEST_BLOCKS;

/* A time trial routine, to measure the speed of MD5.
 Measures wall time required to digest TEST_BLOCKS * TEST_BLOCK_SIZE
 characters.
 */
static void MDTimeTrial() {
    MD5_CTX mdContext;
    time_t endTime, startTime;
    unsigned char data[TEST_BLOCK_SIZE];
    unsigned int i;

    /* initialize test data */
    for (i = 0; i < TEST_BLOCK_SIZE; i++)
        data[i] = (unsigned char) (i & 0xFF);

    /* start timer */
    printf("MD5 time trial. Processing %ld characters...\n", TEST_BYTES);
    time(&startTime);

    /* digest data in TEST_BLOCK_SIZE byte blocks */
    MD5Init(&mdContext);
    for (i = TEST_BLOCKS; i > 0; i--)
        MD5Update(&mdContext, (char *)data, TEST_BLOCK_SIZE);
    MD5Final(&mdContext);

    /* stop timer, get time difference */
    time(&endTime);
    MDPrint(&mdContext);
    printf(" is digest of test input.\n");
    printf("Seconds to process test input: %ld\n", (long) (endTime - startTime));
    printf("Characters processed per second: %ld\n", TEST_BYTES / (endTime - startTime));
}

/* Computes the message digest for string inString.
 Prints out message digest, a space, the string (in quotes) and a
 carriage return.
 */
static void MDString(char *inString) {
    MD5_CTX mdContext;
    unsigned int len = strlen(inString);

    MD5Init(&mdContext);
    MD5Update(&mdContext, inString, len);
    MD5Final(&mdContext);
    MDPrint(&mdContext);
    printf(" \"%s\"\n\n", inString);
}

/* Computes the message digest for a specified file.
 Prints out message digest, a space, the file name, and a carriage
 return.
 */
static void MDFile(char *filename) {
    FILE *inFile = fopen(filename, "rb");
    MD5_CTX mdContext;
    int bytes;
    char data[1024];

    if (inFile == NULL) {
        printf("%s can't be opened.\n", filename);
        return;
    }

    MD5Init(&mdContext);
    while ((bytes = fread(data, 1, 1024, inFile)) != 0)
        MD5Update(&mdContext, data, bytes);
    MD5Final(&mdContext);
    MDPrint(&mdContext);
    printf(" %s\n", filename);
    fclose(inFile);
}

/* Writes the message digest of the data from stdin onto stdout,
 followed by a carriage return.
 */
static void MDFilter() {
    MD5_CTX mdContext;
    int bytes;
    char data[16];

    MD5Init(&mdContext);
    while ((bytes = fread(data, 1, 16, stdin)) != 0)
        MD5Update(&mdContext, data, bytes);
    MD5Final(&mdContext);
    MDPrint(&mdContext);
    printf("\n");
}

/* Runs a standard suite of test data.
 */
static void MDTestSuite() {
    printf("MD5 test suite results:\n\n");
    MDString("");
    MDString("hello");
    MDString("a");
    MDString("abc");
    MDString("message digest");
    MDString("abcdefghijklmnopqrstuvwxyz");
    MDString("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
    MDString("1234567890123456789012345678901234567890"
             "1234567890123456789012345678901234567890");
    /* Contents of file foo are "abc" */
    MDFile("foo");
}

int main(int argc, char *argv[]) {
    int i;

    /* For each command line argument in turn:
     ** filename          -- prints message digest and name of file
     ** -sstring          -- prints message digest and contents of string
     ** -t                -- prints time trial statistics for 1M characters
     ** -x                -- execute a standard suite of test data
     ** (no args)         -- writes messages digest of stdin onto stdout
     */
    if (argc == 1) {
        MDFilter();
    } else {
        for (i = 1; i < argc; i++) {
            if (argv[i][0] == '-' && argv[i][1] == 's') {
                MDString(argv[i] + 2);
            } else if (strcmp(argv[i], "-t") == 0) {
                MDTimeTrial();
            } else if (strcmp(argv[i], "-x") == 0) {
                MDTestSuite();
            } else {
                MDFile(argv[i]);
            }
        }
    }

    return 0;
}

/*
 **********************************************************************
 ** End of md5driver.c                                               **
 ******************************* (cut) ********************************
 */

Ubuntu下测试结果如下:

 

 

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