有人用c语言写过计算md5的么

[syj52417]

计算一个字符串的md5和计算一个文件的md5有什么区别？

[赵4老师]

仅供参考

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <memory.h>
const unsigned int s[4][4]={{7,12,17,22},{5,9,14,20},{4,11,16,23},{6,10,15,21}};
const unsigned long t[64]={//t[i]=4294967296*fabs(sin(i+1));
 0xd76aa478,0xe8c7b756,0x242070db,0xc1bdceee,0xf57c0faf,0x4787c62a,0xa8304613,0xfd469501,
 0x698098d8,0x8b44f7af,0xffff5bb1,0x895cd7be,0x6b901122,0xfd987193,0xa679438e,0x49b40821,
 0xf61e2562,0xc040b340,0x265e5a51,0xe9b6c7aa,0xd62f105d,0x02441453,0xd8a1e681,0xe7d3fbc8,
 0x21e1cde6,0xc33707d6,0xf4d50d87,0x455a14ed,0xa9e3e905,0xfcefa3f8,0x676f02d9,0x8d2a4c8a,
 0xfffa3942,0x8771f681,0x6d9d6122,0xfde5380c,0xa4beea44,0x4bdecfa9,0xf6bb4b60,0xbebfbc70,
 0x289b7ec6,0xeaa127fa,0xd4ef3085,0x04881d05,0xd9d4d039,0xe6db99e5,0x1fa27cf8,0xc4ac5665,
 0xf4292244,0x432aff97,0xab9423a7,0xfc93a039,0x655b59c3,0x8f0ccc92,0xffeff47d,0x85845dd1,
 0x6fa87e4f,0xfe2ce6e0,0xa3014314,0x4e0811a1,0xf7537e82,0xbd3af235,0x2ad7d2bb,0xeb86d391
};
const int serial[64]={
 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
 1,6,11,0,5,10,15,4,9,14,3,8,13,2,7,12,
 5,8,11,14,1,4,7,10,13,0,3,6,9,12,15,2,
 0,7,14,5,12,3,10,1,8,15,6,13,4,11,2,9
};
void func(unsigned long& a,
          unsigned long b,
          unsigned long c,
          unsigned long d,
          unsigned long M,
          unsigned long t,
          int s,
          int turn) {
    unsigned long temp;
    switch(turn) {
    case 0:
        temp=(b&c)|((~b)&d);
        break;
    case 1:
        temp=(d&b)|((~d)&c);
        break;
    case 2:
        temp=b^c^d;
        break;
    case 3:
        temp=c^(b|(~d));
        break;
    }
    temp+=M+t+a;
    _asm {
        mov ecx,s
        rol temp,cl
    }
    a=b+temp;
}
void MD512(const unsigned long M[16],unsigned long hash[4]) {
    int i,j,index=0;
    for (i=0;i<4;i++)
        for (j=0;j<4;j++) {
            func(hash[0],hash[1],hash[2],hash[3],M[serial[index]],t[index],s[i][0],i);
            index++;
            func(hash[3],hash[0],hash[1],hash[2],M[serial[index]],t[index],s[i][1],i);
            index++;
            func(hash[2],hash[3],hash[0],hash[1],M[serial[index]],t[index],s[i][2],i);
            index++;
            func(hash[1],hash[2],hash[3],hash[0],M[serial[index]],t[index],s[i][3],i);
            index++;
        }
}

void MD5(char* M,int nLen,unsigned long output[4]) {
    int i,j;
    unsigned long Hash[4]={0x67452301,0xefcdab89,0x98badcfe,0x10325476};
    unsigned long hash[4];

    //填充
    __int64 BitsLen=nLen*8;
    int oldlen=nLen;
    while(nLen%64!=56) {
        M[nLen++]=0;
    }
    M[oldlen]=0x80u;
    *(__int64*)(M+nLen)=BitsLen;
    nLen+=8;

    //开始处理分组
    for (i=0;i<nLen;i+=64) {
        memcpy(hash,Hash,sizeof(long)*4);
        MD512((const unsigned long*)&M[i],hash);//处理512bits分组
        for (j=0;j<4;j++)
            Hash[j]+=hash[j];
    }

    //处理输出。
    for (i=0;i<4;i++)
        for (j=3;j>=0;j--) {
            *((char*)(output+i)+j)=*((char*)(Hash+i)+3-j);
        }
}
int main() {
    int i;
    char szMessage[1000]={0};
    printf("input a string:\n>>>");
    scanf("%s",szMessage);
    unsigned long output[4];
    MD5(szMessage,strlen(szMessage),output);
    for (i=0;i<4;i++)
        printf("%08lx",output[i]);
    printf("\n");
    return 0;
}

[707wk]

百度上有现成的代码

[qq_16635639]

恩恩，好用，好用 你也下吧