C语言MD5实现

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注：以下是md5加密算法c语言版，加密后16,32位版
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网上找到的md5函数的实现，试过，可以用，稍微修改了，支持输出16和32位两种加密码，记录一下。包括三个文件，依次如下：

头文件 TL_MD5.h

#ifndef MD5_H

#define MD5_H

typedef struct

{

unsigned int count[2];

unsigned int state[4];

unsigned char buffer[64];

}MD5_CTX;

#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))

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

#define FF(a,b,c,d,x,s,ac) \

{ \

a += F(b,c,d) + x + ac; \

a = ROTATE_LEFT(a,s); \

a += b; \

}

#define GG(a,b,c,d,x,s,ac) \

{ \

a += G(b,c,d) + x + ac; \

a = ROTATE_LEFT(a,s); \

a += b; \

}

#define HH(a,b,c,d,x,s,ac) \

{ \

a += H(b,c,d) + x + ac; \

a = ROTATE_LEFT(a,s); \

a += b; \

}

#define II(a,b,c,d,x,s,ac) \

{ \

a += I(b,c,d) + x + ac; \

a = ROTATE_LEFT(a,s); \

a += b; \

}

void MD5Init(MD5_CTX *context);

void MD5Update(MD5_CTX *context,unsigned char *input,unsigned int inputlen);

void MD5Final(MD5_CTX *context,unsigned char digest[16]);

void MD5Transform(unsigned int state[4],unsigned char block[64]);

void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len);

void MD5Decode(unsigned int *output,unsigned char *input,unsigned int len);

#endif

C/C++语言实现文件 TL_MD5.c 或者 TL_MD5.cpp

#include<string.h>

#include "md5.h"

unsigned char PADDING[]={0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

void MD5Init(MD5_CTX *context)

{

context->count[0] = 0;

context->count[1] = 0;

context->state[0] = 0x67452301;

context->state[1] = 0xEFCDAB89;

context->state[2] = 0x98BADCFE;

context->state[3] = 0x10325476;

}

void MD5Update(MD5_CTX *context,unsigned char *input,unsigned int inputlen)

{

unsigned int i = 0,index = 0,partlen = 0;

index = (context->count[0] >> 3) & 0x3F;

partlen = 64 - index;

context->count[0] += inputlen << 3;

if(context->count[0] < (inputlen << 3))

context->count[1]++;

context->count[1] += inputlen >> 29;

if(inputlen >= partlen)

{

memcpy(&context->buffer[index],input,partlen);

MD5Transform(context->state,context->buffer);

for(i = partlen;i+64 <= inputlen;i+=64)

MD5Transform(context->state,&input[i]);

index = 0;

}

else

{

i = 0;

}

memcpy(&context->buffer[index],&input[i],inputlen-i);

}

void MD5Final(MD5_CTX *context,unsigned char digest[16])

{

unsigned int index = 0,padlen = 0;

unsigned char bits[8];

index = (context->count[0] >> 3) & 0x3F;

padlen = (index < 56)?(56-index):(120-index);

MD5Encode(bits,context->count,8);

MD5Update(context,PADDING,padlen);

MD5Update(context,bits,8);

MD5Encode(digest,context->state,16);

}

void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len)

{

unsigned int i = 0,j = 0;

while(j < len)

{

output[j] = input[i] & 0xFF;

output[j+1] = (input[i] >> 8) & 0xFF;

output[j+2] = (input[i] >> 16) & 0xFF;

output[j+3] = (input[i] >> 24) & 0xFF;

i++;

j+=4;

}

}

void MD5Decode(unsigned int *output,unsigned char *input,unsigned int len)

{

unsigned int i = 0,j = 0;

while(j < len)

{

output[i] = (input[j]) |

(input[j+1] << 8) |

(input[j+2] << 16) |

(input[j+3] << 24);

i++;

j+=4;

}

}

void MD5Transform(unsigned int state[4],unsigned char block[64])

{

unsigned int a = state[0];

unsigned int b = state[1];

unsigned int c = state[2];

unsigned int d = state[3];

unsigned int x[64];

MD5Decode(x,block,64);

FF(a, b, c, d, x[ 0], 7, 0xd76aa478);

FF(d, a, b, c, x[ 1], 12, 0xe8c7b756);

FF(c, d, a, b, x[ 2], 17, 0x242070db);

FF(b, c, d, a, x[ 3], 22, 0xc1bdceee);

FF(a, b, c, d, x[ 4], 7, 0xf57c0faf);

FF(d, a, b, c, x[ 5], 12, 0x4787c62a);

FF(c, d, a, b, x[ 6], 17, 0xa8304613);

FF(b, c, d, a, x[ 7], 22, 0xfd469501);

FF(a, b, c, d, x[ 8], 7, 0x698098d8);

FF(d, a, b, c, x[ 9], 12, 0x8b44f7af);

FF(c, d, a, b, x[10], 17, 0xffff5bb1);

FF(b, c, d, a, x[11], 22, 0x895cd7be);

FF(a, b, c, d, x[12], 7, 0x6b901122);

FF(d, a, b, c, x[13], 12, 0xfd987193);

FF(c, d, a, b, x[14], 17, 0xa679438e);

FF(b, c, d, a, x[15], 22, 0x49b40821);

GG(a, b, c, d, x[ 1], 5, 0xf61e2562);

GG(d, a, b, c, x[ 6], 9, 0xc040b340);

GG(c, d, a, b, x[11], 14, 0x265e5a51);

GG(b, c, d, a, x[ 0], 20, 0xe9b6c7aa);

GG(a, b, c, d, x[ 5], 5, 0xd62f105d);

GG(d, a, b, c, x[10], 9, 0x2441453);

GG(c, d, a, b, x[15], 14, 0xd8a1e681);

GG(b, c, d, a, x[ 4], 20, 0xe7d3fbc8);

GG(a, b, c, d, x[ 9], 5, 0x21e1cde6);

GG(d, a, b, c, x[14], 9, 0xc33707d6);

GG(c, d, a, b, x[ 3], 14, 0xf4d50d87);

GG(b, c, d, a, x[ 8], 20, 0x455a14ed);

GG(a, b, c, d, x[13], 5, 0xa9e3e905);

GG(d, a, b, c, x[ 2], 9, 0xfcefa3f8);

GG(c, d, a, b, x[ 7], 14, 0x676f02d9);

GG(b, c, d, a, x[12], 20, 0x8d2a4c8a);

HH(a, b, c, d, x[ 5], 4, 0xfffa3942);

HH(d, a, b, c, x[ 8], 11, 0x8771f681);

HH(c, d, a, b, x[11], 16, 0x6d9d6122);

HH(b, c, d, a, x[14], 23, 0xfde5380c);

HH(a, b, c, d, x[ 1], 4, 0xa4beea44);

HH(d, a, b, c, x[ 4], 11, 0x4bdecfa9);

HH(c, d, a, b, x[ 7], 16, 0xf6bb4b60);

HH(b, c, d, a, x[10], 23, 0xbebfbc70);

HH(a, b, c, d, x[13], 4, 0x289b7ec6);

HH(d, a, b, c, x[ 0], 11, 0xeaa127fa);

HH(c, d, a, b, x[ 3], 16, 0xd4ef3085);

HH(b, c, d, a, x[ 6], 23, 0x4881d05);

HH(a, b, c, d, x[ 9], 4, 0xd9d4d039);

HH(d, a, b, c, x[12], 11, 0xe6db99e5);

HH(c, d, a, b, x[15], 16, 0x1fa27cf8);

HH(b, c, d, a, x[ 2], 23, 0xc4ac5665);

II(a, b, c, d, x[ 0], 6, 0xf4292244);

II(d, a, b, c, x[ 7], 10, 0x432aff97);

II(c, d, a, b, x[14], 15, 0xab9423a7);

II(b, c, d, a, x[ 5], 21, 0xfc93a039);

II(a, b, c, d, x[12], 6, 0x655b59c3);

II(d, a, b, c, x[ 3], 10, 0x8f0ccc92);

II(c, d, a, b, x[10], 15, 0xffeff47d);

II(b, c, d, a, x[ 1], 21, 0x85845dd1);

II(a, b, c, d, x[ 8], 6, 0x6fa87e4f);

II(d, a, b, c, x[15], 10, 0xfe2ce6e0);

II(c, d, a, b, x[ 6], 15, 0xa3014314);

II(b, c, d, a, x[13], 21, 0x4e0811a1);

II(a, b, c, d, x[ 4], 6, 0xf7537e82);

II(d, a, b, c, x[11], 10, 0xbd3af235);

II(c, d, a, b, x[ 2], 15, 0x2ad7d2bb);

II(b, c, d, a, x[ 9], 21, 0xeb86d391);

state[0] += a;

state[1] += b;

state[2] += c;

state[3] += d;

}

md5函数测试代码文件

#include

#include

#include

#include "md5.h"

int main(int argc, char *argv[])

{

MD5_CTX md5;

MD5Init(&md5);

int i;

unsigned char encrypt[] ="admin";//21232f297a57a5a743894a0e4a801fc3

unsigned char decrypt[16];

MD5Update(&md5,encrypt,strlen((char *)encrypt));

MD5Final(&md5,decrypt);

printf("加密前:%s\n加密后16位:",encrypt);

for(i=4;i<12;i++)

{

printf("02x",decrypt[i]); //02x前需要加上%

}

printf("\n加密前:%s\n加密后32位:",encrypt);

for(i=0;i<16;i++)

{

printf("02x",decrypt[i]); //02x前需要加上%

}

getchar();

return 0;

}

MD5加密常用字符

7a57a5a743894a0e admin(16位MD5小写加密)

972130B75066C825 ADMIN(16位MD5大写加密)

21232f297a57a5a743894a0e4a801fc3 admin(32位MD5小写加密)

73ACD9A5972130B75066C82595A1FAE3 ADMIN(32位MD5大写加密)

49ba59abbe56e057 123456(16位MD5小写加密)

e10adc3949ba59abbe56e057f20f883e 123456(32位MD5小写加密)

469e80d32c0559f8 admin888(16位MD5小写加密)

2299413865C28A35 ADMIN888(16位MD5大写加密)

7fef6171469e80d32c0559f88b377245 admin888(32位MD5小写加密)

A1F63A962299413865C28A3593D359B0 ADMIN888(32位MD5大写加密)

md5知识扫盲
MD5：是一个具体的算法,散列算法，哈西算法，但非加密算法（因为没有密钥），可用于加密（不可逆）

MD5是一种单向散列函数，单向散列函数的作用是将任何长度的一段数据散列成固定长度。常用于生成消息认证码等等，可以与非对称算法一起用于数字签名。

标准见http://www.ietf.org/rfc/rfc1321.txt

MD5好象被国内的一个教授破解了,顺便给大家一个地址http://www.cmd5.com/,有时候应该会很方便的.:)