MD5 算法

加密C:http://jnu.shiyanbar.com/course/6200/vid/57

  int main()
{
    int i;
    unsigned long a;
    unsigned long b;
    unsigned long c;
    unsigned long d;
    unsigned long M[16];

    ISD_input();

    ISD_append();
    for(i=0;i<num;i=i+64)
    {
        a=A;b=B;c=C;d=D;
        memmove((char*)M,info+i,64);
        //round 1
        ISD_FF(a, b, c, d, M[0], 7, 0xd76aa478);
        ISD_FF(d, a, b, c, M[1], 12, 0xe8c7b756);
        ISD_FF(c, d, a, b, M[2], 17, 0x242070db);
        ISD_FF(b, c, d, a, M[3], 22, 0xc1bdceee);
        ISD_FF(a, b, c, d, M[4], 7, 0xf57c0faf);
        ISD_FF(d, a, b, c, M[5], 12, 0x4787c62a);
        ISD_FF(c, d, a, b, M[6], 17, 0xa8304613);
        ISD_FF(b, c, d, a, M[7], 22, 0xfd469501);
        ISD_FF(a, b, c, d, M[8], 7, 0x698098d8);
        ISD_FF(d, a, b, c, M[9], 12, 0x8b44f7af);
        ISD_FF(c, d, a, b, M[10], 17, 0xffff5bb1);
        ISD_FF(b, c, d, a, M[11], 22, 0x895cd7be);
        ISD_FF(a, b, c, d, M[12], 7, 0x6b901122);
        ISD_FF(d, a, b, c, M[13], 12, 0xfd987193);
        ISD_FF(c, d, a, b, M[14], 17, 0xa679438e);
        ISD_FF(b, c, d, a, M[15], 22, 0x49b40821);
        //round 2
        ISD_GG(a, b, c, d, M[1], 5, 0xf61e2562);
        ISD_GG(d, a, b, c, M[6], 9, 0xc040b340);
        ISD_GG(c, d, a, b, M[11], 14, 0x265e5a51);
        ISD_GG(b, c, d, a, M[0], 20, 0xe9b6c7aa);
        ISD_GG(a, b, c, d, M[5], 5, 0xd62f105d);
        ISD_GG(d, a, b, c, M[10], 9, 0x02441453);
        ISD_GG(c, d, a, b, M[15], 14, 0xd8a1e681);
        ISD_GG(b, c, d, a, M[4], 20, 0xe7d3fbc8);
        ISD_GG(a, b, c, d, M[9], 5, 0x21e1cde6);
        ISD_GG(d, a, b, c, M[14], 9, 0xc33707d6);
        ISD_GG(c, d, a, b, M[3], 14, 0xf4d50d87);
        ISD_GG(b, c, d, a, M[8], 20, 0x455a14ed);
        ISD_GG(a, b, c, d, M[13], 5, 0xa9e3e905);
        ISD_GG(d, a, b, c, M[2], 9, 0xfcefa3f8);
        ISD_GG(c, d, a, b, M[7], 14, 0x676f02d9);
        ISD_GG(b, c, d, a, M[12], 20, 0x8d2a4c8a);
        //round 3
        ISD_HH(a, b, c, d, M[5], 4, 0xfffa3942);
        ISD_HH(d, a, b, c, M[8], 11, 0x8771f681);
        ISD_HH(c, d, a, b, M[11], 16, 0x6d9d6122);
        ISD_HH(b, c, d, a, M[14], 23, 0xfde5380c);
        ISD_HH(a, b, c, d, M[1], 4, 0xa4beea44);
        ISD_HH(d, a, b, c, M[4], 11, 0x4bdecfa9);
        ISD_HH(c, d, a, b, M[7], 16, 0xf6bb4b60);
        ISD_HH(b, c, d, a, M[10], 23, 0xbebfbc70);
        ISD_HH(a, b, c, d, M[13], 4, 0x289b7ec6);
        ISD_HH(d, a, b, c, M[0], 11, 0xeaa127fa);
        ISD_HH(c, d, a, b, M[3], 16, 0xd4ef3085);
        ISD_HH(b, c, d, a, M[6], 23, 0x04881d05);
        ISD_HH(a, b, c, d, M[9], 4, 0xd9d4d039);
        ISD_HH(d, a, b, c, M[12], 11, 0xe6db99e5);
        ISD_HH(c, d, a, b, M[15], 16, 0x1fa27cf8);
        ISD_HH(b, c, d, a, M[2], 23, 0xc4ac5665);
        //round 4
        ISD_II(a, b, c, d, M[0], 6, 0xf4292244);
        ISD_II(d, a, b, c, M[7], 10, 0x432aff97);
        ISD_II(c, d, a, b, M[14], 15, 0xab9423a7);
        ISD_II(b, c, d, a, M[5], 21, 0xfc93a039);
        ISD_II(a, b, c, d, M[12], 6, 0x655b59c3);
        ISD_II(d, a, b, c, M[3], 10, 0x8f0ccc92);
        ISD_II(c, d, a, b, M[10], 15, 0xffeff47d);
        ISD_II(b, c, d, a, M[1], 21, 0x85845dd1);
        ISD_II(a, b, c, d, M[8], 6, 0x6fa87e4f);
        ISD_II(d, a, b, c, M[15], 10, 0xfe2ce6e0);
        ISD_II(c, d, a, b, M[6], 15, 0xa3014314);
        ISD_II(b, c, d, a, M[13], 21, 0x4e0811a1);
        ISD_II(a, b, c, d, M[4], 6, 0xf7537e82);
        ISD_II(d, a, b, c, M[11], 10, 0xbd3af235);
        ISD_II(c, d, a, b, M[2], 15, 0x2ad7d2bb);
        ISD_II(b, c, d, a, M[9], 21, 0xeb86d391);
        A+=a;B+=b;C+=c;D+=d;
    }

    unsigned char r[16];

    memmove(r+0,(char *)&A,4);
    memmove(r+4,(char *)&B,4);
    memmove(r+8,(char *)&C,4);
    memmove(r+12,(char *)&D,4);
    printf("摘要值:");

    for(i=0;i<16;i++)
        printf("%02x",r[i]);
    printf("\n");
    return 0;
}