void MD5::transform(UINT4 state[4], unsigned char block[64])
{
    UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

    decode(x, block, 64);

    // Round 1
    FF (a, b, c, d, x[ 0], S11, 0xd76aa478); // 1
    FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); // 2
    FF (c, d, a, b, x[ 2], S13, 0x242070db); // 3
    FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); // 4
    FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); // 5
    FF (d, a, b, c, x[ 5], S12, 0x4787c62a); // 6
    FF (c, d, a, b, x[ 6], S13, 0xa8304613); // 7
    FF (b, c, d, a, x[ 7], S14, 0xfd469501); // 8
    FF (a, b, c, d, x[ 8], S11, 0x698098d8); // 9
    FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); // 10
    FF (c, d, a, b, x[10], S13, 0xffff5bb1); // 11
    FF (b, c, d, a, x[11], S14, 0x895cd7be); // 12
    FF (a, b, c, d, x[12], S11, 0x6b901122); // 13
    FF (d, a, b, c, x[13], S12, 0xfd987193); // 14
    FF (c, d, a, b, x[14], S13, 0xa679438e); // 15
    FF (b, c, d, a, x[15], S14, 0x49b40821); // 16

    // Round 2
    GG (a, b, c, d, x[ 1], S21, 0xf61e2562); // 17
    GG (d, a, b, c, x[ 6], S22, 0xc040b340); // 18
    GG (c, d, a, b, x[11], S23, 0x265e5a51); // 19
    GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); // 20
    GG (a, b, c, d, x[ 5], S21, 0xd62f105d); // 21
    GG (d, a, b, c, x[10], S22,  0x2441453); // 22
    GG (c, d, a, b, x[15], S23, 0xd8a1e681); // 23
    GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); // 24
    GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); // 25
    GG (d, a, b, c, x[14], S22, 0xc33707d6); // 26
    GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); // 27
    GG (b, c, d, a, x[ 8], S24, 0x455a14ed); // 28
    GG (a, b, c, d, x[13], S21, 0xa9e3e905); // 29
    GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); // 30
    GG (c, d, a, b, x[ 7], S23, 0x676f02d9); // 31
    GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); // 32

    // Round 3
    HH (a, b, c, d, x[ 5], S31, 0xfffa3942); // 33
    HH (d, a, b, c, x[ 8], S32, 0x8771f681); // 34
    HH (c, d, a, b, x[11], S33, 0x6d9d6122); // 35
    HH (b, c, d, a, x[14], S34, 0xfde5380c); // 36
    HH (a, b, c, d, x[ 1], S31, 0xa4beea44); // 37
    HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); // 38
    HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); // 39
    HH (b, c, d, a, x[10], S34, 0xbebfbc70); // 40
    HH (a, b, c, d, x[13], S31, 0x289b7ec6); // 41
    HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); // 42
    HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); // 43
    HH (b, c, d, a, x[ 6], S34,  0x4881d05); // 44
    HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); // 45
    HH (d, a, b, c, x[12], S32, 0xe6db99e5); // 46
    HH (c, d, a, b, x[15], S33, 0x1fa27cf8); // 47
    HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); // 48

    // Round 4
    II (a, b, c, d, x[ 0], S41, 0xf4292244); // 49
    II (d, a, b, c, x[ 7], S42, 0x432aff97); // 50
    II (c, d, a, b, x[14], S43, 0xab9423a7); // 51
    II (b, c, d, a, x[ 5], S44, 0xfc93a039); // 52
    II (a, b, c, d, x[12], S41, 0x655b59c3); // 53
    II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); // 54
    II (c, d, a, b, x[10], S43, 0xffeff47d); // 55
    II (b, c, d, a, x[ 1], S44, 0x85845dd1); // 56
    II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); // 57
    II (d, a, b, c, x[15], S42, 0xfe2ce6e0); // 58
    II (c, d, a, b, x[ 6], S43, 0xa3014314); // 59
    II (b, c, d, a, x[13], S44, 0x4e0811a1); // 60
    II (a, b, c, d, x[ 4], S41, 0xf7537e82); // 61
    II (d, a, b, c, x[11], S42, 0xbd3af235); // 62
    II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); // 63
    II (b, c, d, a, x[ 9], S44, 0xeb86d391); // 64

    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;

    // Zeroize sensitive information.

    memset (x, 0, sizeof (x));
}
void MD5::transform(UINT4 state[4], unsigned char block[64])
{
    UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

    decode(x, block, 64);

     
    FF (a, b, c, d, x[ 0], S11, 0xd76aa478);  
    FF (d, a, b, c, x[ 1], S12, 0xe8c7b756);  
    FF (c, d, a, b, x[ 2], S13, 0x242070db);  
    FF (b, c, d, a, x[ 3], S14, 0xc1bdceee);  
    FF (a, b, c, d, x[ 4], S11, 0xf57c0faf);  
    FF (d, a, b, c, x[ 5], S12, 0x4787c62a);  
    FF (c, d, a, b, x[ 6], S13, 0xa8304613);  
    FF (b, c, d, a, x[ 7], S14, 0xfd469501);  
    FF (a, b, c, d, x[ 8], S11, 0x698098d8);  
    FF (d, a, b, c, x[ 9], S12, 0x8b44f7af);  
    FF (c, d, a, b, x[10], S13, 0xffff5bb1);  
    FF (b, c, d, a, x[11], S14, 0x895cd7be);  
    FF (a, b, c, d, x[12], S11, 0x6b901122);  
    FF (d, a, b, c, x[13], S12, 0xfd987193);  
    FF (c, d, a, b, x[14], S13, 0xa679438e);  
    FF (b, c, d, a, x[15], S14, 0x49b40821);  

     
    GG (a, b, c, d, x[ 1], S21, 0xf61e2562);  
    GG (d, a, b, c, x[ 6], S22, 0xc040b340);  
    GG (c, d, a, b, x[11], S23, 0x265e5a51);  
    GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa);  
    GG (a, b, c, d, x[ 5], S21, 0xd62f105d);  
    GG (d, a, b, c, x[10], S22,  0x2441453);  
    GG (c, d, a, b, x[15], S23, 0xd8a1e681);  
    GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8);  
    GG (a, b, c, d, x[ 9], S21, 0x21e1cde6);  
    GG (d, a, b, c, x[14], S22, 0xc33707d6);  
    GG (c, d, a, b, x[ 3], S23, 0xf4d50d87);  
    GG (b, c, d, a, x[ 8], S24, 0x455a14ed);  
    GG (a, b, c, d, x[13], S21, 0xa9e3e905);  
    GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8);  
    GG (c, d, a, b, x[ 7], S23, 0x676f02d9);  
    GG (b, c, d, a, x[12], S24, 0x8d2a4c8a);  

     
    HH (a, b, c, d, x[ 5], S31, 0xfffa3942);  
    HH (d, a, b, c, x[ 8], S32, 0x8771f681);  
    HH (c, d, a, b, x[11], S33, 0x6d9d6122);  
    HH (b, c, d, a, x[14], S34, 0xfde5380c);  
    HH (a, b, c, d, x[ 1], S31, 0xa4beea44);  
    HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9);  
    HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60);  
    HH (b, c, d, a, x[10], S34, 0xbebfbc70);  
    HH (a, b, c, d, x[13], S31, 0x289b7ec6);  
    HH (d, a, b, c, x[ 0], S32, 0xeaa127fa);  
    HH (c, d, a, b, x[ 3], S33, 0xd4ef3085);  
    HH (b, c, d, a, x[ 6], S34,  0x4881d05);  
    HH (a, b, c, d, x[ 9], S31, 0xd9d4d039);  
    HH (d, a, b, c, x[12], S32, 0xe6db99e5);  
    HH (c, d, a, b, x[15], S33, 0x1fa27cf8);  
    HH (b, c, d, a, x[ 2], S34, 0xc4ac5665);  

     
    II (a, b, c, d, x[ 0], S41, 0xf4292244);  
    II (d, a, b, c, x[ 7], S42, 0x432aff97);  
    II (c, d, a, b, x[14], S43, 0xab9423a7);  
    II (b, c, d, a, x[ 5], S44, 0xfc93a039);  
    II (a, b, c, d, x[12], S41, 0x655b59c3);  
    II (d, a, b, c, x[ 3], S42, 0x8f0ccc92);  
    II (c, d, a, b, x[10], S43, 0xffeff47d);  
    II (b, c, d, a, x[ 1], S44, 0x85845dd1);  
    II (a, b, c, d, x[ 8], S41, 0x6fa87e4f);  
    II (d, a, b, c, x[15], S42, 0xfe2ce6e0);  
    II (c, d, a, b, x[ 6], S43, 0xa3014314);  
    II (b, c, d, a, x[13], S44, 0x4e0811a1);  
    II (a, b, c, d, x[ 4], S41, 0xf7537e82);  
    II (d, a, b, c, x[11], S42, 0xbd3af235);  
    II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb);  
    II (b, c, d, a, x[ 9], S44, 0xeb86d391);  

    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;

     

    memset (x, 0, sizeof (x));
}