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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