md5代码c（md5百度百科）

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本文目录一览：

• 1、求一个简单的md5加密程序C或C++代码
• 2、C语言 MD5加密
• 3、请教MD5算法 用C语言实现
• 4、C语言求文件MD5的函数用法

求一个简单的md5加密程序C或C++代码

C语言实现MD5算法

#includestdio.h

#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 RL(x, y) (((x) (y)) | ((x) (32 - (y)))) //x向左循环移y位

#define PP(x) (x24)|((x8)0xff0000)|((x8)0xff00)|(x24) //将x高低位互换,例如PP(aabbccdd)=ddccbbaa

#define FF(a, b, c, d, x, s, ac) a = b + (RL((a + F(b,c,d) + x + ac),s))

#define GG(a, b, c, d, x, s, ac) a = b + (RL((a + G(b,c,d) + x + ac),s))

#define HH(a, b, c, d, x, s, ac) a = b + (RL((a + H(b,c,d) + x + ac),s))

#define II(a, b, c, d, x, s, ac) a = b + (RL((a + I(b,c,d) + x + ac),s))

unsigned A,B,C,D,a,b,c,d,i,len,flen[2],x[16]; //i临时变量,len文件长,flen[2]为64位二进制表示的文件初始长度

char filename[200]; //文件名

FILE *fp;

void md5(){ //MD5核心算法,供64轮

a=A,b=B,c=C,d=D;

/**//* Round 1 */

FF (a, b, c, d, x[ 0], 7, 0xd76aa478); /**//* 1 */

FF (d, a, b, c, x[ 1], 12, 0xe8c7b756); /**//* 2 */

FF (c, d, a, b, x[ 2], 17, 0x242070db); /**//* 3 */

FF (b, c, d, a, x[ 3], 22, 0xc1bdceee); /**//* 4 */

FF (a, b, c, d, x[ 4], 7, 0xf57c0faf); /**//* 5 */

FF (d, a, b, c, x[ 5], 12, 0x4787c62a); /**//* 6 */

FF (c, d, a, b, x[ 6], 17, 0xa8304613); /**//* 7 */

FF (b, c, d, a, x[ 7], 22, 0xfd469501); /**//* 8 */

FF (a, b, c, d, x[ 8], 7, 0x698098d8); /**//* 9 */

FF (d, a, b, c, x[ 9], 12, 0x8b44f7af); /**//* 10 */

FF (c, d, a, b, x[10], 17, 0xffff5bb1); /**//* 11 */

FF (b, c, d, a, x[11], 22, 0x895cd7be); /**//* 12 */

FF (a, b, c, d, x[12], 7, 0x6b901122); /**//* 13 */

FF (d, a, b, c, x[13], 12, 0xfd987193); /**//* 14 */

FF (c, d, a, b, x[14], 17, 0xa679438e); /**//* 15 */

FF (b, c, d, a, x[15], 22, 0x49b40821); /**//* 16 */

/**//* Round 2 */

GG (a, b, c, d, x[ 1], 5, 0xf61e2562); /**//* 17 */

GG (d, a, b, c, x[ 6], 9, 0xc040b340); /**//* 18 */

GG (c, d, a, b, x[11], 14, 0x265e5a51); /**//* 19 */

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

GG (a, b, c, d, x[ 5], 5, 0xd62f105d); /**//* 21 */

GG (d, a, b, c, x[10], 9, 0x02441453); /**//* 22 */

GG (c, d, a, b, x[15], 14, 0xd8a1e681); /**//* 23 */

GG (b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /**//* 24 */

GG (a, b, c, d, x[ 9], 5, 0x21e1cde6); /**//* 25 */

GG (d, a, b, c, x[14], 9, 0xc33707d6); /**//* 26 */

GG (c, d, a, b, x[ 3], 14, 0xf4d50d87); /**//* 27 */

GG (b, c, d, a, x[ 8], 20, 0x455a14ed); /**//* 28 */

GG (a, b, c, d, x[13], 5, 0xa9e3e905); /**//* 29 */

GG (d, a, b, c, x[ 2], 9, 0xfcefa3f8); /**//* 30 */

GG (c, d, a, b, x[ 7], 14, 0x676f02d9); /**//* 31 */

GG (b, c, d, a, x[12], 20, 0x8d2a4c8a); /**//* 32 */

/**//* Round 3 */

HH (a, b, c, d, x[ 5], 4, 0xfffa3942); /**//* 33 */

HH (d, a, b, c, x[ 8], 11, 0x8771f681); /**//* 34 */

HH (c, d, a, b, x[11], 16, 0x6d9d6122); /**//* 35 */

HH (b, c, d, a, x[14], 23, 0xfde5380c); /**//* 36 */

HH (a, b, c, d, x[ 1], 4, 0xa4beea44); /**//* 37 */

HH (d, a, b, c, x[ 4], 11, 0x4bdecfa9); /**//* 38 */

HH (c, d, a, b, x[ 7], 16, 0xf6bb4b60); /**//* 39 */

HH (b, c, d, a, x[10], 23, 0xbebfbc70); /**//* 40 */

HH (a, b, c, d, x[13], 4, 0x289b7ec6); /**//* 41 */

HH (d, a, b, c, x[ 0], 11, 0xeaa127fa); /**//* 42 */

HH (c, d, a, b, x[ 3], 16, 0xd4ef3085); /**//* 43 */

HH (b, c, d, a, x[ 6], 23, 0x04881d05); /**//* 44 */

HH (a, b, c, d, x[ 9], 4, 0xd9d4d039); /**//* 45 */

HH (d, a, b, c, x[12], 11, 0xe6db99e5); /**//* 46 */

HH (c, d, a, b, x[15], 16, 0x1fa27cf8); /**//* 47 */

HH (b, c, d, a, x[ 2], 23, 0xc4ac5665); /**//* 48 */

/**//* Round 4 */

II (a, b, c, d, x[ 0], 6, 0xf4292244); /**//* 49 */

II (d, a, b, c, x[ 7], 10, 0x432aff97); /**//* 50 */

II (c, d, a, b, x[14], 15, 0xab9423a7); /**//* 51 */

II (b, c, d, a, x[ 5], 21, 0xfc93a039); /**//* 52 */

II (a, b, c, d, x[12], 6, 0x655b59c3); /**//* 53 */

II (d, a, b, c, x[ 3], 10, 0x8f0ccc92); /**//* 54 */

II (c, d, a, b, x[10], 15, 0xffeff47d); /**//* 55 */

II (b, c, d, a, x[ 1], 21, 0x85845dd1); /**//* 56 */

II (a, b, c, d, x[ 8], 6, 0x6fa87e4f); /**//* 57 */

II (d, a, b, c, x[15], 10, 0xfe2ce6e0); /**//* 58 */

II (c, d, a, b, x[ 6], 15, 0xa3014314); /**//* 59 */

II (b, c, d, a, x[13], 21, 0x4e0811a1); /**//* 60 */

II (a, b, c, d, x[ 4], 6, 0xf7537e82); /**//* 61 */

II (d, a, b, c, x[11], 10, 0xbd3af235); /**//* 62 */

II (c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /**//* 63 */

II (b, c, d, a, x[ 9], 21, 0xeb86d391); /**//* 64 */

A += a;

B += b;

C += c;

D += d;

}

main(){

while(1){

printf("Input file:");

gets(filename); //用get函数,避免scanf以空格分割数据,

if (filename[0]==34) filename[strlen(filename)-1]=0,strcpy(filename,filename+1); //支持文件拖曳,但会多出双引号,这里是处理多余的双引号

if (!strcmp(filename,"exit")) exit(0); //输入exit退出

if (!(fp=fopen(filename,"rb"))) {printf("Can not open this file!\n");continue;} //以二进制打开文件

fseek(fp, 0, SEEK_END); //文件指针转到文件末尾

if((len=ftell(fp))==-1) {printf("Sorry! Can not calculate files which larger than 2 GB!\n");fclose(fp);continue;} //ftell函数返回long,最大为2GB,超出返回-1

rewind(fp); //文件指针复位到文件头

A=0x67452301,B=0xefcdab89,C=0x98badcfe,D=0x10325476; //初始化链接变量

flen[1]=len/0x20000000; //flen单位是bit

flen[0]=(len%0x20000000)*8;

memset(x,0,64); //初始化x数组为0

fread(x,4,16,fp); //以4字节为一组,读取16组数据

for(i=0;ilen/64;i++){ //循环运算直至文件结束

md5();

memset(x,0,64);

fread(x,4,16,fp);

}

((char*)x)[len%64]=128; //文件结束补1,补0操作,128二进制即10000000

if(len%6455) md5(),memset(x,0,64);

memcpy(x+14,flen,8); //文件末尾加入原文件的bit长度

md5();

fclose(fp);

printf("MD5 Code:%08x%08x%08x%08x\n",PP(A),PP(B),PP(C),PP(D)); //高低位逆反输出

}

}

C语言 MD5加密

main.cpp

#include stdio.h

#include string.h

#include stdlib.h

#include "md5.c"

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

{

int i;

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

unsigned char decrypt[16];

MD5_CTX md5;

MD5Init(md5);

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

MD5Final(md5, decrypt);

printf("加密前:%s\n加密后:", encrypt);

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

{

printf("%02x", decrypt[i]);

}

getchar();

return 0;

}

md5.c

#include memory.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); /* 1 */

    FF(d, a, b, c, x[1], 12, 0xe8c7b756); /* 2 */

    FF(c, d, a, b, x[2], 17, 0x242070db); /* 3 */

    FF(b, c, d, a, x[3], 22, 0xc1bdceee); /* 4 */

    FF(a, b, c, d, x[4], 7, 0xf57c0faf); /* 5 */

    FF(d, a, b, c, x[5], 12, 0x4787c62a); /* 6 */

    FF(c, d, a, b, x[6], 17, 0xa8304613); /* 7 */

    FF(b, c, d, a, x[7], 22, 0xfd469501); /* 8 */

    FF(a, b, c, d, x[8], 7, 0x698098d8); /* 9 */

    FF(d, a, b, c, x[9], 12, 0x8b44f7af); /* 10 */

    FF(c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */

    FF(b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */

    FF(a, b, c, d, x[12], 7, 0x6b901122); /* 13 */

    FF(d, a, b, c, x[13], 12, 0xfd987193); /* 14 */

    FF(c, d, a, b, x[14], 17, 0xa679438e); /* 15 */

    FF(b, c, d, a, x[15], 22, 0x49b40821); /* 16 */

    /* Round 2 */

    GG(a, b, c, d, x[1], 5, 0xf61e2562); /* 17 */

    GG(d, a, b, c, x[6], 9, 0xc040b340); /* 18 */

    GG(c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */

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

    GG(a, b, c, d, x[5], 5, 0xd62f105d); /* 21 */

    GG(d, a, b, c, x[10], 9, 0x2441453); /* 22 */

    GG(c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */

    GG(b, c, d, a, x[4], 20, 0xe7d3fbc8); /* 24 */

    GG(a, b, c, d, x[9], 5, 0x21e1cde6); /* 25 */

    GG(d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */

    GG(c, d, a, b, x[3], 14, 0xf4d50d87); /* 27 */

    GG(b, c, d, a, x[8], 20, 0x455a14ed); /* 28 */

    GG(a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */

    GG(d, a, b, c, x[2], 9, 0xfcefa3f8); /* 30 */

    GG(c, d, a, b, x[7], 14, 0x676f02d9); /* 31 */

    GG(b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */

    /* Round 3 */

    HH(a, b, c, d, x[5], 4, 0xfffa3942); /* 33 */

    HH(d, a, b, c, x[8], 11, 0x8771f681); /* 34 */

    HH(c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */

    HH(b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */

    HH(a, b, c, d, x[1], 4, 0xa4beea44); /* 37 */

    HH(d, a, b, c, x[4], 11, 0x4bdecfa9); /* 38 */

    HH(c, d, a, b, x[7], 16, 0xf6bb4b60); /* 39 */

    HH(b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */

    HH(a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */

    HH(d, a, b, c, x[0], 11, 0xeaa127fa); /* 42 */

    HH(c, d, a, b, x[3], 16, 0xd4ef3085); /* 43 */

    HH(b, c, d, a, x[6], 23, 0x4881d05); /* 44 */

    HH(a, b, c, d, x[9], 4, 0xd9d4d039); /* 45 */

    HH(d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */

    HH(c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */

    HH(b, c, d, a, x[2], 23, 0xc4ac5665); /* 48 */

    /* Round 4 */

    II(a, b, c, d, x[0], 6, 0xf4292244); /* 49 */

    II(d, a, b, c, x[7], 10, 0x432aff97); /* 50 */

    II(c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */

    II(b, c, d, a, x[5], 21, 0xfc93a039); /* 52 */

    II(a, b, c, d, x[12], 6, 0x655b59c3); /* 53 */

    II(d, a, b, c, x[3], 10, 0x8f0ccc92); /* 54 */

    II(c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */

    II(b, c, d, a, x[1], 21, 0x85845dd1); /* 56 */

    II(a, b, c, d, x[8], 6, 0x6fa87e4f); /* 57 */

    II(d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */

    II(c, d, a, b, x[6], 15, 0xa3014314); /* 59 */

    II(b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */

    II(a, b, c, d, x[4], 6, 0xf7537e82); /* 61 */

    II(d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */

    II(c, d, a, b, x[2], 15, 0x2ad7d2bb); /* 63 */

    II(b, c, d, a, x[9], 21, 0xeb86d391); /* 64 */

    state[0] += a;

    state[1] += b;

    state[2] += c;

    state[3] += d;

}

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

请教MD5算法 用C语言实现

#include stdio.h

#include stdlib.h

#include string.h

#if defined(__APPLE__)

#  define COMMON_DIGEST_FOR_OPENSSL

#  include CommonCrypto/CommonDigest.h

#  define SHA1 CC_SHA1

#else

#  include openssl/md5.h

#endif

// 这是我自己写的函数，用于计算MD5

// 参数 str：要转换的字符串

// 参数 lengthL: 字符串的长度 可以用 strlen(str) 直接获取参数str的长度

// 返回值：MD5字符串

char *str2md5(const char * str, int length) {

    int n;

    MD5_CTX c;

    unsigned char digest[16];

    char *out = (char*)malloc(33);

    MD5_Init(c);

    while (length  0) {

        if (length  512) {

            MD5_Update(c, str, 512);

        } else {

            MD5_Update(c, str, length);

        }

        length -= 512;

        str += 512;

    }

    MD5_Final(digest, c);

    for (n = 0; n  16; ++n) {

        snprintf((out[n*2]), 16*2, "%02x", (unsigned int)digest[n]);

    }

    return out;

}

    int main(int argc, char **argv) {

        char *output = str2md5("hello", strlen("hello"));

        printf("%s\n", output);

        // 上面会输出 hello的MD5字符串：

        // 5d41402abc4b2a76b9719d911017c592

        free(output);

        return 0;

    }

C语言求文件MD5的函数用法

#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

源文件md5.c

#include memory.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); /* 1 */

FF(d, a, b, c, x[ 1], 12, 0xe8c7b756); /* 2 */

FF(c, d, a, b, x[ 2], 17, 0x242070db); /* 3 */

FF(b, c, d, a, x[ 3], 22, 0xc1bdceee); /* 4 */

FF(a, b, c, d, x[ 4], 7, 0xf57c0faf); /* 5 */

FF(d, a, b, c, x[ 5], 12, 0x4787c62a); /* 6 */

FF(c, d, a, b, x[ 6], 17, 0xa8304613); /* 7 */

FF(b, c, d, a, x[ 7], 22, 0xfd469501); /* 8 */

FF(a, b, c, d, x[ 8], 7, 0x698098d8); /* 9 */

FF(d, a, b, c, x[ 9], 12, 0x8b44f7af); /* 10 */

FF(c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */

FF(b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */

FF(a, b, c, d, x[12], 7, 0x6b901122); /* 13 */

FF(d, a, b, c, x[13], 12, 0xfd987193); /* 14 */

FF(c, d, a, b, x[14], 17, 0xa679438e); /* 15 */

FF(b, c, d, a, x[15], 22, 0x49b40821); /* 16 */

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