/*
 *	This is the C++ implementation of the MD5 Message-Digest
 *	Algorithm desrcipted in RFC 1321.
 *	I translated the C code from this RFC to C++.
 *	There is now warranty.
 *
 *	Feb. 12. 2005
 *	Benjamin Grüdelbach
 */

/*
 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
 * rights reserved.
 * 
 * License to copy and use this software is granted provided that it
 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
 * Algorithm" in all material mentioning or referencing this software
 * or this function.
 * 
 * License is also granted to make and use derivative works provided
 * that such works are identified as "derived from the RSA Data
 * Security, Inc. MD5 Message-Digest Algorithm" in all material
 * mentioning or referencing the derived work.
 * 
 * RSA Data Security, Inc. makes no representations concerning either
 * the merchantability of this software or the suitability of this
 * software for any particular purpose. It is provided "as is"
 * without express or implied warranty of any kind.
 * 
 * These notices must be retained in any copies of any part of this
 * documentation and/or software.
 */

#include <rudiments/private/inttypes.h>
#include <rudiments/charstring.h>

//---------------------------------------------------------------------- 
//typedefs
typedef unsigned char *POINTER;

/*
 * MD5 context.
 */
typedef struct 
{
	uint32_t state[4];   	      /* state (ABCD) */
	uint32_t count[2]; 	      /* number of bits, modulo 2^64 (lsb first) */
	unsigned char buffer[64];	      /* input buffer */
} MD5_CONTEXT;

/*
 * MD5 class
 */
class MD5
{

	private:

		void MD5Transform (uint32_t state[4], const unsigned char block[64]);
		void Encode (unsigned char*, uint32_t*, uint64_t);
		void Decode (uint32_t*, const unsigned char*, uint64_t);
		void MD5_memcpy (POINTER, POINTER, uint64_t);
		void MD5_memset (POINTER, int, uint64_t);

	public:
	
		void MD5Init (MD5_CONTEXT*);
		void MD5Update (MD5_CONTEXT*, const unsigned char*, uint64_t);
		void MD5Final (unsigned char [16], MD5_CONTEXT*);

		static char *MD5ConvertToAscii(const unsigned char *);
		static char *MD5Sum(const unsigned char *, uint64_t);

	MD5(){};
};

#include <stdio.h>

// Constants for MD5Transform routine.
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static unsigned char PADDING[64] = {
  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
};

/* F, G, H and I are basic MD5 functions. */
#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)))

/* ROTATE_LEFT rotates x left n bits. */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/*
FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
#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); \
  }

/* MD5 initialization. Begins an MD5 operation, writing a new context. */
void MD5::MD5Init (MD5_CONTEXT *context)
{
	  context->count[0] = context->count[1] = 0;
	  context->state[0] = 0x67452301;
	  context->state[1] = 0xefcdab89;
	  context->state[2] = 0x98badcfe;
	  context->state[3] = 0x10325476;
}

/*
	 MD5 block update operation. Continues an MD5 message-digest
	 operation, processing another message block, and updating the
	 context.
*/
void MD5::MD5Update (MD5_CONTEXT *context, const unsigned char *input, uint64_t inputLen)
{
	  uint64_t i, index, partLen;

	  /* Compute number of bytes mod 64 */
	  index = ((context->count[0] >> 3) & 0x3F);

	  /* Update number of bits */
	  if ( (context->count[0] += (inputLen << 3))
	       < (inputLen << 3))
		context->count[1]++;

	  context->count[1] += (inputLen >> 29);
	  partLen = 64 - index;

	  /*
	   * Transform as many times as possible.
	   */
	  if (inputLen >= partLen) 
	  {
		 MD5_memcpy ((POINTER)&context->buffer[index], (POINTER)input, partLen);
		 MD5Transform (context->state, context->buffer);

		 for (i = partLen; i + 63 < inputLen; i += 64)
		   MD5Transform (context->state, &input[i]);

		 index = 0;
	  }
	  else 
	 	i = 0;

	  /* Buffer remaining input */
	  MD5_memcpy ((POINTER)&context->buffer[index],
	              (POINTER)&input[i],
		      inputLen-i);
}

/*
 * MD5 finalization. Ends an MD5 message-digest operation, writing the
 * the message digest and zeroizing the context.
 */
void MD5::MD5Final (unsigned char digest[16], MD5_CONTEXT *context)
{
	unsigned char bits[8];
	uint64_t index, padLen;

	/* Save number of bits */
	Encode (bits, context->count, 8);

	/* 
	 * Pad out to 56 mod 64.
	 */
	index = ((context->count[0] >> 3) & 0x3f);
	padLen = (index < 56) ? (56 - index) : (120 - index);
	MD5Update (context, PADDING, padLen);

	/* Append length (before padding) */
	MD5Update (context, bits, 8);

	/* Store state in digest */
	Encode (digest, context->state, 16);

	/*
	 * Zeroize sensitive information.
	 */
	MD5_memset ((POINTER)context, 0, sizeof (*context));
}

/*
 * MD5 basic transformation. Transforms state based on block.
 */
void MD5::MD5Transform (uint32_t state[4], const unsigned char block[64])
{
	uint32_t 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.
	 */
	MD5_memset ((POINTER)x, 0, sizeof (x));
}

/* 
 * Encodes input  into output (unsigned char). Assumes len is
 * a multiple of 4.
 */
void MD5::Encode (unsigned char *output, uint32_t *input, uint64_t len)
{
	uint64_t 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);
	}
}

/*
 * Decodes input (unsigned char) into output . Assumes len is
 * a multiple of 4.
 */
void MD5::Decode (uint32_t *output, const unsigned char *input, uint64_t len)
{
	  uint64_t i, j;

	  for (i = 0, j = 0; j < len; i++, j += 4)
		 output[i] = (input[j]) | 
			     ((input[j+1]) << 8) |
			     ((input[j+2]) << 16) |
			     ((input[j+3]) << 24);
}

/*
 * Note: Replace "for loop" with standard memcpy if possible.
 */
void MD5::MD5_memcpy (POINTER output, POINTER input, uint64_t len)
{
	uint64_t i;

	for (i = 0; i < len; i++)
		output[i] = input[i];
}

/*
 * Note: Replace "for loop" with standard memset if possible.
 */
void MD5::MD5_memset (POINTER output,int value,uint64_t len)
{
	uint64_t i;
	for (i = 0; i < len; i++)
		((char *)output)[i] = (char)value;
}

char *MD5::MD5ConvertToAscii(const unsigned char *digest)
{

	//converte the hash to a string and return it
	char *asciihash=new char[33];

	uint16_t	p=0;
	for(uint16_t i=0; i<16; i++) {
		charstring::printf(&asciihash[p],2,"%02x",digest[i]);
		p+=2;
	}	
	asciihash[32]='\0';
	return asciihash;
}

char *MD5::MD5Sum(const unsigned char *data, uint64_t size) {

	//init md5
	MD5_CONTEXT	ctx;
	MD5		md5;
	md5.MD5Init(&ctx);

	//update with our string
	md5.MD5Update(&ctx,data,size);
	
	//create the hash
	unsigned char buff[16]="";
	md5.MD5Final(buff,&ctx);

	//converte the hash to a string and return it
	return md5.MD5ConvertToAscii(buff);
}

// Code below Copyright (c) 2012  David Muse
// See the file COPYING for more information

#include <sqlrelay/sqlrserver.h>
#include <rudiments/charstring.h>

class SQLRSERVER_DLLSPEC sqlrpwenc_md5 : public sqlrpwdenc {
	public:
			sqlrpwenc_md5(xmldomnode *parameters);
		bool	oneWay();
		char	*encrypt(const char *value);
};

sqlrpwenc_md5::sqlrpwenc_md5(xmldomnode *parameters) : sqlrpwdenc(parameters) {
}

bool sqlrpwenc_md5::oneWay() {
	return true;
}

char *sqlrpwenc_md5::encrypt(const char *value) {
	return MD5::MD5Sum((unsigned char *)value,
				charstring::length(value));
}

extern "C" {
	SQLRSERVER_DLLSPEC sqlrpwdenc *new_sqlrpwdenc_md5(
						xmldomnode *parameters) {
		return new sqlrpwenc_md5(parameters);
	}
}
