path: root/contrib/epee/include/md5_l.inl

/*
* libEtPan! -- a mail stuff library
*
* Copyright (C) 2001, 2005 - DINH Viet Hoa
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the libEtPan! project nor the names of its
*    contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* $Id: md5.c,v 1.1.1.1 2005/03/18 20:17:27 zautrix Exp $
*/

/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
*/

/* 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.
*/

#ifdef _WIN32
# include <winsock2.h>
#else
# include <arpa/inet.h>
#endif
#include "md5global.h"
#include "md5_l.h"

namespace md5
{
	/* 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 void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
	{
		unsigned int i; 

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

	static void MD5Transform (UINT4 state[4], unsigned char block[64]);

	static unsigned char* PADDING()
	{
		static unsigned char local_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 
		};

		return local_PADDING;

	}



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

	*/
#ifdef I
	/* This might be defined via NANA */
#undef I
#endif

#define MD5_M_F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define MD5_M_G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define MD5_M_H(x, y, z) ((x) ^ (y) ^ (z))
#define MD5_M_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) += MD5_M_F ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s));        (a) += (b);        } 
#define GG(a, b, c, d, x, s, ac) {        (a) += MD5_M_G ((b), (c), (d)) + (x) + (UINT4)(ac);        (a) = ROTATE_LEFT ((a), (s));        (a) += (b);         } 
#define HH(a, b, c, d, x, s, ac) {        (a) += MD5_M_H ((b), (c), (d)) + (x) + (UINT4)(ac);        (a) = ROTATE_LEFT ((a), (s));        (a) += (b);        } 
#define II(a, b, c, d, x, s, ac) {        (a) += MD5_M_I ((b), (c), (d)) + (x) + (UINT4)(ac);        (a) = ROTATE_LEFT ((a), (s));        (a) += (b);        } 

	/* MD5 initialization. Begins an MD5 operation, writing a new context.
	*/

	static void MD5Init(MD5_CTX * context)
	{
		context->count[0] = context->count[1] = 0; 

		/* Load magic initialization constants.

		*/
		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. 
	*/

	static void MD5Update( MD5_CTX *context, const unsigned char *input, unsigned int inputLen )
	{
		unsigned int i, index, partLen; 

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

		/* Update number of bits */
		if ((context->count[0] += ((UINT4)inputLen << 3))
			< ((UINT4)inputLen << 3))
			context->count[1]++;
		context->count[1] += ((UINT4)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, (unsigned char*)&input[i]); 

			index = 0; 
		} 
		else 
			i = 0; 

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

	}

	/* Encodes input (UINT4) into output (unsigned char). Assumes len is
	a multiple of 4. 

	*/

	static void Encode (unsigned char *output, UINT4 *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); 
		} 
	}

	/* Decodes input (unsigned char) into output (UINT4). Assumes len is
	a multiple of 4. 

	*/

	static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
	{
		unsigned int i, j; 

		for (i = 0, j = 0; j < len; i++, j += 4) 
			output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | (((UINT4)input[j+2]) << 16)
			| (((UINT4)input[j+3]) << 24); 
	}

	/* MD5 finalization. Ends an MD5 message-digest operation, writing the
	the message digest and zeroizing the context. 

	*/

	static void MD5Final ( unsigned char digest[16], MD5_CTX *context )
	{
		unsigned char bits[8]; 
		unsigned int index, padLen; 

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

		/* Pad out to 56 mod 64.

		*/
		index = (unsigned int)((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.

		*/
		memwipe ((POINTER)context, sizeof (*context));
	}

	/* MD5 basic transformation. Transforms state based on block.

	*/

	static void MD5Transform (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.
		*/
		memwipe ((POINTER)x, sizeof (x));
	}
}