#include "stdafx.h"
#include "md5_lib_src.h"

MD5::MD5()
{
	PADDING[0] = 0x80;
	for(int i=0; i<63; i++)
		PADDING[i+1]=0;

	count[0] = count[1] = 0;
	state[0] = 0x67452301;
	state[1] = 0xefcdab89;
	state[2] = 0x98badcfe;
	state[3] = 0x10325476;

	memset(buffer, 0x00, sizeof(buffer));
}

MD5::~MD5()
{
}


void MD5::MD5Encode(char *string, unsigned char *buffer)
{
	unsigned char digest[16];
	unsigned int len = strlen (string);
	
	MD5Update ((unsigned char *)string, len);
	MD5Final (digest);
	
	memcpy(buffer, digest, sizeof(digest));
}


void MD5::MD5Binary2String(unsigned char digest[16], char *EncodedString)
{	
	sprintf(EncodedString, "%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
		digest[0], digest[1], digest[2], digest[3], digest[4], digest[5],
		digest[6], digest[7], digest[8], digest[9], digest[10],
		digest[11], digest[12], digest[13], digest[14], digest[15]);	
}

void MD5::MD5String2Binary(char *EncodedString, unsigned char byDigest[16])
{
	char	szTemp[128];
	for(int i = 0; i < 16; i++)
	{
		memset(szTemp, 0x00, 128);
		memcpy(szTemp, &EncodedString[i * 2], 2);
		byDigest[i] = (unsigned char)strtol(szTemp, NULL, 16);
	}
}

void MD5::MD5Update (unsigned char *input, unsigned int inputLen)
{
	unsigned int i, index, partLen;
	
	index = (unsigned int)((count[0] >> 3) & 0x3F);
	
	if ((count[0] += ((unsigned long int)inputLen << 3)) < ((unsigned long int)inputLen << 3))
		count[1]++;
	count[1] += ((unsigned long int)inputLen >> 29);
	
	partLen = 64 - index;
	
	if (inputLen >= partLen) 
	{
		MD5_memcpy((unsigned char *)&buffer[index], (unsigned char *)input, partLen);
		MD5Transform(state, buffer);
		
		for (i = partLen; i + 63 < inputLen; i += 64)
			MD5Transform (state, &input[i]);
		
		index = 0;
	}
	else
		i = 0;
	
	MD5_memcpy((unsigned char *)&buffer[index], (unsigned char *)&input[i], inputLen-i);
}

void MD5::MD5Final (unsigned char digest[16])
{
	unsigned char bits[8];
	unsigned int index, padLen;
	
	Encode (bits, count, 8);
	
	index = (unsigned int)((count[0] >> 3) & 0x3f);
	padLen = (index < 56) ? (56 - index) : (120 - index);
	MD5Update (PADDING, padLen);
	
	MD5Update (bits, 8);
	
	Encode (digest, state, 16);
    
	MD5_memset ((unsigned char *)this, 0, sizeof (*this));
}

void MD5::MD5Transform (unsigned long int state[4], unsigned char block[64])
{
	unsigned long int 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;
	
	MD5_memset ((unsigned char *)x, 0, sizeof (x));
}

void MD5::Encode (unsigned char *output, unsigned long int *input, unsigned int len)
{
	unsigned int i, j;
	
	for (i = 0, j = 0; j < len; i++, j += 4) {
		output[j] = (unsigned char)(input[i] & 0xff);
		output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
		output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
		output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
	}
}

void MD5::Decode (unsigned long int *output, unsigned char *input, unsigned int len)
{
	unsigned int i, j;
	
	for (i = 0, j = 0; j < len; i++, j += 4)
		output[i] = ((unsigned long int)input[j]) | (((unsigned long int)input[j+1]) << 8) |
		(((unsigned long int)input[j+2]) << 16) | (((unsigned long int)input[j+3]) << 24);
}


void MD5::MD5_memcpy(unsigned char * output,unsigned char * input,unsigned int len)
{
	unsigned int i;
	
	for (i = 0; i < len; i++)
		output[i] = input[i];
}

void MD5::MD5_memset(unsigned char * output,int value,unsigned int len)
{
	unsigned int i;
	
	for (i = 0; i < len; i++)
		((char *)output)[i] = (char)value;
}

