MD5 C语言16位和32位版本

来源：互联网发布：淘宝开店怎么实名认证编辑：程序博客网时间：2024/05/22 05:26

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

MD5.c

 #include <string.h>#include "md6.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;  }

main.c

#include <stdio.h>#include "md6.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。

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http://blog.sina.com.cn/s/blog_693de6100101kcu6.html

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