Utilities/cmlibrhash/librhash/md5.c - third_party/cmake - Git at Google

 /* md5.c - an implementation of the MD5 algorithm, based on RFC 1321.
  *
  * Copyright: 2007-2012 Aleksey Kravchenko <rhash.admin@gmail.com>
  *
  * Permission is hereby granted,  free of charge,  to any person  obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction,  including without limitation
  * the rights to  use, copy, modify,  merge, publish, distribute, sublicense,
  * and/or sell copies  of  the Software,  and to permit  persons  to whom the
  * Software is furnished to do so.
  *
  * This program  is  distributed  in  the  hope  that it will be useful,  but
  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  * or FITNESS FOR A PARTICULAR PURPOSE.  Use this program  at  your own risk!
  */

 #include <string.h>
 #include "byte_order.h"
 #include "md5.h"

 /**
  * Initialize context before calculaing hash.
  *
  * @param ctx context to initialize
  */
 void rhash_md5_init(md5_ctx *ctx)
 {
 	ctx->length = 0;

 	/* initialize state */
 	ctx->hash[0] = 0x67452301;
 	ctx->hash[1] = 0xefcdab89;
 	ctx->hash[2] = 0x98badcfe;
 	ctx->hash[3] = 0x10325476;
 }

 /* First, define four auxiliary functions that each take as input
  * three 32-bit words and returns a 32-bit word.*/

 /* F(x,y,z) = ((y XOR z) AND x) XOR z - is faster then original version */
 #define MD5_F(x, y, z) ((((y) ^ (z)) & (x)) ^ (z))
 #define MD5_G(x, y, z) (((x) & (z)) | ((y) & (~z)))
 #define MD5_H(x, y, z) ((x) ^ (y) ^ (z))
 #define MD5_I(x, y, z) ((y) ^ ((x) | (~z)))

 /* transformations for rounds 1, 2, 3, and 4. */
 #define MD5_ROUND1(a, b, c, d, x, s, ac) { \
 	(a) += MD5_F((b), (c), (d)) + (x) + (ac); \
 	(a) = ROTL32((a), (s)); \
 	(a) += (b); \
 }
 #define MD5_ROUND2(a, b, c, d, x, s, ac) { \
 	(a) += MD5_G((b), (c), (d)) + (x) + (ac); \
 	(a) = ROTL32((a), (s)); \
 	(a) += (b); \
 }
 #define MD5_ROUND3(a, b, c, d, x, s, ac) { \
 	(a) += MD5_H((b), (c), (d)) + (x) + (ac); \
 	(a) = ROTL32((a), (s)); \
 	(a) += (b); \
 }
 #define MD5_ROUND4(a, b, c, d, x, s, ac) { \
 	(a) += MD5_I((b), (c), (d)) + (x) + (ac); \
 	(a) = ROTL32((a), (s)); \
 	(a) += (b); \
 }

 /**
  * The core transformation. Process a 512-bit block.
  * The function has been taken from RFC 1321 with little changes.
  *
  * @param state algorithm state
  * @param x the message block to process
  */
 static void rhash_md5_process_block(unsigned state[4], const unsigned* x)
 {
 	register unsigned a, b, c, d;
 	a = state[0];
 	b = state[1];
 	c = state[2];
 	d = state[3];

 	MD5_ROUND1(a, b, c, d, x[ 0],  7, 0xd76aa478);
 	MD5_ROUND1(d, a, b, c, x[ 1], 12, 0xe8c7b756);
 	MD5_ROUND1(c, d, a, b, x[ 2], 17, 0x242070db);
 	MD5_ROUND1(b, c, d, a, x[ 3], 22, 0xc1bdceee);
 	MD5_ROUND1(a, b, c, d, x[ 4],  7, 0xf57c0faf);
 	MD5_ROUND1(d, a, b, c, x[ 5], 12, 0x4787c62a);
 	MD5_ROUND1(c, d, a, b, x[ 6], 17, 0xa8304613);
 	MD5_ROUND1(b, c, d, a, x[ 7], 22, 0xfd469501);
 	MD5_ROUND1(a, b, c, d, x[ 8],  7, 0x698098d8);
 	MD5_ROUND1(d, a, b, c, x[ 9], 12, 0x8b44f7af);
 	MD5_ROUND1(c, d, a, b, x[10], 17, 0xffff5bb1);
 	MD5_ROUND1(b, c, d, a, x[11], 22, 0x895cd7be);
 	MD5_ROUND1(a, b, c, d, x[12],  7, 0x6b901122);
 	MD5_ROUND1(d, a, b, c, x[13], 12, 0xfd987193);
 	MD5_ROUND1(c, d, a, b, x[14], 17, 0xa679438e);
 	MD5_ROUND1(b, c, d, a, x[15], 22, 0x49b40821);

 	MD5_ROUND2(a, b, c, d, x[ 1],  5, 0xf61e2562);
 	MD5_ROUND2(d, a, b, c, x[ 6],  9, 0xc040b340);
 	MD5_ROUND2(c, d, a, b, x[11], 14, 0x265e5a51);
 	MD5_ROUND2(b, c, d, a, x[ 0], 20, 0xe9b6c7aa);
 	MD5_ROUND2(a, b, c, d, x[ 5],  5, 0xd62f105d);
 	MD5_ROUND2(d, a, b, c, x[10],  9,  0x2441453);
 	MD5_ROUND2(c, d, a, b, x[15], 14, 0xd8a1e681);
 	MD5_ROUND2(b, c, d, a, x[ 4], 20, 0xe7d3fbc8);
 	MD5_ROUND2(a, b, c, d, x[ 9],  5, 0x21e1cde6);
 	MD5_ROUND2(d, a, b, c, x[14],  9, 0xc33707d6);
 	MD5_ROUND2(c, d, a, b, x[ 3], 14, 0xf4d50d87);
 	MD5_ROUND2(b, c, d, a, x[ 8], 20, 0x455a14ed);
 	MD5_ROUND2(a, b, c, d, x[13],  5, 0xa9e3e905);
 	MD5_ROUND2(d, a, b, c, x[ 2],  9, 0xfcefa3f8);
 	MD5_ROUND2(c, d, a, b, x[ 7], 14, 0x676f02d9);
 	MD5_ROUND2(b, c, d, a, x[12], 20, 0x8d2a4c8a);

 	MD5_ROUND3(a, b, c, d, x[ 5],  4, 0xfffa3942);
 	MD5_ROUND3(d, a, b, c, x[ 8], 11, 0x8771f681);
 	MD5_ROUND3(c, d, a, b, x[11], 16, 0x6d9d6122);
 	MD5_ROUND3(b, c, d, a, x[14], 23, 0xfde5380c);
 	MD5_ROUND3(a, b, c, d, x[ 1],  4, 0xa4beea44);
 	MD5_ROUND3(d, a, b, c, x[ 4], 11, 0x4bdecfa9);
 	MD5_ROUND3(c, d, a, b, x[ 7], 16, 0xf6bb4b60);
 	MD5_ROUND3(b, c, d, a, x[10], 23, 0xbebfbc70);
 	MD5_ROUND3(a, b, c, d, x[13],  4, 0x289b7ec6);
 	MD5_ROUND3(d, a, b, c, x[ 0], 11, 0xeaa127fa);
 	MD5_ROUND3(c, d, a, b, x[ 3], 16, 0xd4ef3085);
 	MD5_ROUND3(b, c, d, a, x[ 6], 23,  0x4881d05);
 	MD5_ROUND3(a, b, c, d, x[ 9],  4, 0xd9d4d039);
 	MD5_ROUND3(d, a, b, c, x[12], 11, 0xe6db99e5);
 	MD5_ROUND3(c, d, a, b, x[15], 16, 0x1fa27cf8);
 	MD5_ROUND3(b, c, d, a, x[ 2], 23, 0xc4ac5665);

 	MD5_ROUND4(a, b, c, d, x[ 0],  6, 0xf4292244);
 	MD5_ROUND4(d, a, b, c, x[ 7], 10, 0x432aff97);
 	MD5_ROUND4(c, d, a, b, x[14], 15, 0xab9423a7);
 	MD5_ROUND4(b, c, d, a, x[ 5], 21, 0xfc93a039);
 	MD5_ROUND4(a, b, c, d, x[12],  6, 0x655b59c3);
 	MD5_ROUND4(d, a, b, c, x[ 3], 10, 0x8f0ccc92);
 	MD5_ROUND4(c, d, a, b, x[10], 15, 0xffeff47d);
 	MD5_ROUND4(b, c, d, a, x[ 1], 21, 0x85845dd1);
 	MD5_ROUND4(a, b, c, d, x[ 8],  6, 0x6fa87e4f);
 	MD5_ROUND4(d, a, b, c, x[15], 10, 0xfe2ce6e0);
 	MD5_ROUND4(c, d, a, b, x[ 6], 15, 0xa3014314);
 	MD5_ROUND4(b, c, d, a, x[13], 21, 0x4e0811a1);
 	MD5_ROUND4(a, b, c, d, x[ 4],  6, 0xf7537e82);
 	MD5_ROUND4(d, a, b, c, x[11], 10, 0xbd3af235);
 	MD5_ROUND4(c, d, a, b, x[ 2], 15, 0x2ad7d2bb);
 	MD5_ROUND4(b, c, d, a, x[ 9], 21, 0xeb86d391);

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

 /**
  * Calculate message hash.
  * Can be called repeatedly with chunks of the message to be hashed.
  *
  * @param ctx the algorithm context containing current hashing state
  * @param msg message chunk
  * @param size length of the message chunk
  */
 void rhash_md5_update(md5_ctx *ctx, const unsigned char* msg, size_t size)
 {
 	unsigned index = (unsigned)ctx->length & 63;
 	ctx->length += size;

 	/* fill partial block */
 	if (index) {
 		unsigned left = md5_block_size - index;
 		le32_copy((char*)ctx->message, index, msg, (size < left ? size : left));
 		if (size < left) return;

 		/* process partial block */
 		rhash_md5_process_block(ctx->hash, ctx->message);
 		msg  += left;
 		size -= left;
 	}
 	while (size >= md5_block_size) {
 		unsigned* aligned_message_block;
 		if (IS_LITTLE_ENDIAN && IS_ALIGNED_32(msg)) {
 			/* the most common case is processing a 32-bit aligned message
 			on a little-endian CPU without copying it */
 			aligned_message_block = (unsigned*)msg;
 		} else {
 			le32_copy(ctx->message, 0, msg, md5_block_size);
 			aligned_message_block = ctx->message;
 		}

 		rhash_md5_process_block(ctx->hash, aligned_message_block);
 		msg  += md5_block_size;
 		size -= md5_block_size;
 	}
 	if (size) {
 		/* save leftovers */
 		le32_copy(ctx->message, 0, msg, size);
 	}
 }

 /**
  * Store calculated hash into the given array.
  *
  * @param ctx the algorithm context containing current hashing state
  * @param result calculated hash in binary form
  */
 void rhash_md5_final(md5_ctx *ctx, unsigned char* result)
 {
 	unsigned index = ((unsigned)ctx->length & 63) >> 2;
 	unsigned shift = ((unsigned)ctx->length & 3) * 8;

 	/* pad message and run for last block */

 	/* append the byte 0x80 to the message */
 	ctx->message[index]   &= ~(0xFFFFFFFFu << shift);
 	ctx->message[index++] ^= 0x80u << shift;

 	/* if no room left in the message to store 64-bit message length */
 	if (index > 14) {
 		/* then fill the rest with zeros and process it */
 		while (index < 16) {
 			ctx->message[index++] = 0;
 		}
 		rhash_md5_process_block(ctx->hash, ctx->message);
 		index = 0;
 	}
 	while (index < 14) {
 		ctx->message[index++] = 0;
 	}
 	ctx->message[14] = (unsigned)(ctx->length << 3);
 	ctx->message[15] = (unsigned)(ctx->length >> 29);
 	rhash_md5_process_block(ctx->hash, ctx->message);

 	if (result) le32_copy(result, 0, &ctx->hash, 16);
 }
	/* md5.c - an implementation of the MD5 algorithm, based on RFC 1321.
	*
	* Copyright: 2007-2012 Aleksey Kravchenko <rhash.admin@gmail.com>
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	* or FITNESS FOR A PARTICULAR PURPOSE. Use this program at your own risk!
	*/

	#include <string.h>
	#include "byte_order.h"
	#include "md5.h"

	/**
	* Initialize context before calculaing hash.
	*
	* @param ctx context to initialize
	*/
	void rhash_md5_init(md5_ctx *ctx)
	{
	ctx->length = 0;

	/* initialize state */
	ctx->hash[0] = 0x67452301;
	ctx->hash[1] = 0xefcdab89;
	ctx->hash[2] = 0x98badcfe;
	ctx->hash[3] = 0x10325476;
	}

	/* First, define four auxiliary functions that each take as input
	* three 32-bit words and returns a 32-bit word.*/

	/* F(x,y,z) = ((y XOR z) AND x) XOR z - is faster then original version */
	#define MD5_F(x, y, z) ((((y) ^ (z)) & (x)) ^ (z))
	#define MD5_G(x, y, z) (((x) & (z)) \| ((y) & (~z)))
	#define MD5_H(x, y, z) ((x) ^ (y) ^ (z))
	#define MD5_I(x, y, z) ((y) ^ ((x) \| (~z)))

	/* transformations for rounds 1, 2, 3, and 4. */
	#define MD5_ROUND1(a, b, c, d, x, s, ac) { \
	(a) += MD5_F((b), (c), (d)) + (x) + (ac); \
	(a) = ROTL32((a), (s)); \
	(a) += (b); \
	}
	#define MD5_ROUND2(a, b, c, d, x, s, ac) { \
	(a) += MD5_G((b), (c), (d)) + (x) + (ac); \
	(a) = ROTL32((a), (s)); \
	(a) += (b); \
	}
	#define MD5_ROUND3(a, b, c, d, x, s, ac) { \
	(a) += MD5_H((b), (c), (d)) + (x) + (ac); \
	(a) = ROTL32((a), (s)); \
	(a) += (b); \
	}
	#define MD5_ROUND4(a, b, c, d, x, s, ac) { \
	(a) += MD5_I((b), (c), (d)) + (x) + (ac); \
	(a) = ROTL32((a), (s)); \
	(a) += (b); \
	}

	/**
	* The core transformation. Process a 512-bit block.
	* The function has been taken from RFC 1321 with little changes.
	*
	* @param state algorithm state
	* @param x the message block to process
	*/
	static void rhash_md5_process_block(unsigned state[4], const unsigned* x)
	{
	register unsigned a, b, c, d;
	a = state[0];
	b = state[1];
	c = state[2];
	d = state[3];

	MD5_ROUND1(a, b, c, d, x[ 0], 7, 0xd76aa478);
	MD5_ROUND1(d, a, b, c, x[ 1], 12, 0xe8c7b756);
	MD5_ROUND1(c, d, a, b, x[ 2], 17, 0x242070db);
	MD5_ROUND1(b, c, d, a, x[ 3], 22, 0xc1bdceee);
	MD5_ROUND1(a, b, c, d, x[ 4], 7, 0xf57c0faf);
	MD5_ROUND1(d, a, b, c, x[ 5], 12, 0x4787c62a);
	MD5_ROUND1(c, d, a, b, x[ 6], 17, 0xa8304613);
	MD5_ROUND1(b, c, d, a, x[ 7], 22, 0xfd469501);
	MD5_ROUND1(a, b, c, d, x[ 8], 7, 0x698098d8);
	MD5_ROUND1(d, a, b, c, x[ 9], 12, 0x8b44f7af);
	MD5_ROUND1(c, d, a, b, x[10], 17, 0xffff5bb1);
	MD5_ROUND1(b, c, d, a, x[11], 22, 0x895cd7be);
	MD5_ROUND1(a, b, c, d, x[12], 7, 0x6b901122);
	MD5_ROUND1(d, a, b, c, x[13], 12, 0xfd987193);
	MD5_ROUND1(c, d, a, b, x[14], 17, 0xa679438e);
	MD5_ROUND1(b, c, d, a, x[15], 22, 0x49b40821);

	MD5_ROUND2(a, b, c, d, x[ 1], 5, 0xf61e2562);
	MD5_ROUND2(d, a, b, c, x[ 6], 9, 0xc040b340);
	MD5_ROUND2(c, d, a, b, x[11], 14, 0x265e5a51);
	MD5_ROUND2(b, c, d, a, x[ 0], 20, 0xe9b6c7aa);
	MD5_ROUND2(a, b, c, d, x[ 5], 5, 0xd62f105d);
	MD5_ROUND2(d, a, b, c, x[10], 9, 0x2441453);
	MD5_ROUND2(c, d, a, b, x[15], 14, 0xd8a1e681);
	MD5_ROUND2(b, c, d, a, x[ 4], 20, 0xe7d3fbc8);
	MD5_ROUND2(a, b, c, d, x[ 9], 5, 0x21e1cde6);
	MD5_ROUND2(d, a, b, c, x[14], 9, 0xc33707d6);
	MD5_ROUND2(c, d, a, b, x[ 3], 14, 0xf4d50d87);
	MD5_ROUND2(b, c, d, a, x[ 8], 20, 0x455a14ed);
	MD5_ROUND2(a, b, c, d, x[13], 5, 0xa9e3e905);
	MD5_ROUND2(d, a, b, c, x[ 2], 9, 0xfcefa3f8);
	MD5_ROUND2(c, d, a, b, x[ 7], 14, 0x676f02d9);
	MD5_ROUND2(b, c, d, a, x[12], 20, 0x8d2a4c8a);

	MD5_ROUND3(a, b, c, d, x[ 5], 4, 0xfffa3942);
	MD5_ROUND3(d, a, b, c, x[ 8], 11, 0x8771f681);
	MD5_ROUND3(c, d, a, b, x[11], 16, 0x6d9d6122);
	MD5_ROUND3(b, c, d, a, x[14], 23, 0xfde5380c);
	MD5_ROUND3(a, b, c, d, x[ 1], 4, 0xa4beea44);
	MD5_ROUND3(d, a, b, c, x[ 4], 11, 0x4bdecfa9);
	MD5_ROUND3(c, d, a, b, x[ 7], 16, 0xf6bb4b60);
	MD5_ROUND3(b, c, d, a, x[10], 23, 0xbebfbc70);
	MD5_ROUND3(a, b, c, d, x[13], 4, 0x289b7ec6);
	MD5_ROUND3(d, a, b, c, x[ 0], 11, 0xeaa127fa);
	MD5_ROUND3(c, d, a, b, x[ 3], 16, 0xd4ef3085);
	MD5_ROUND3(b, c, d, a, x[ 6], 23, 0x4881d05);
	MD5_ROUND3(a, b, c, d, x[ 9], 4, 0xd9d4d039);
	MD5_ROUND3(d, a, b, c, x[12], 11, 0xe6db99e5);
	MD5_ROUND3(c, d, a, b, x[15], 16, 0x1fa27cf8);
	MD5_ROUND3(b, c, d, a, x[ 2], 23, 0xc4ac5665);

	MD5_ROUND4(a, b, c, d, x[ 0], 6, 0xf4292244);
	MD5_ROUND4(d, a, b, c, x[ 7], 10, 0x432aff97);
	MD5_ROUND4(c, d, a, b, x[14], 15, 0xab9423a7);
	MD5_ROUND4(b, c, d, a, x[ 5], 21, 0xfc93a039);
	MD5_ROUND4(a, b, c, d, x[12], 6, 0x655b59c3);
	MD5_ROUND4(d, a, b, c, x[ 3], 10, 0x8f0ccc92);
	MD5_ROUND4(c, d, a, b, x[10], 15, 0xffeff47d);
	MD5_ROUND4(b, c, d, a, x[ 1], 21, 0x85845dd1);
	MD5_ROUND4(a, b, c, d, x[ 8], 6, 0x6fa87e4f);
	MD5_ROUND4(d, a, b, c, x[15], 10, 0xfe2ce6e0);
	MD5_ROUND4(c, d, a, b, x[ 6], 15, 0xa3014314);
	MD5_ROUND4(b, c, d, a, x[13], 21, 0x4e0811a1);
	MD5_ROUND4(a, b, c, d, x[ 4], 6, 0xf7537e82);
	MD5_ROUND4(d, a, b, c, x[11], 10, 0xbd3af235);
	MD5_ROUND4(c, d, a, b, x[ 2], 15, 0x2ad7d2bb);
	MD5_ROUND4(b, c, d, a, x[ 9], 21, 0xeb86d391);

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

	/**
	* Calculate message hash.
	* Can be called repeatedly with chunks of the message to be hashed.
	*
	* @param ctx the algorithm context containing current hashing state
	* @param msg message chunk
	* @param size length of the message chunk
	*/
	void rhash_md5_update(md5_ctx ctx, const unsigned char msg, size_t size)
	{
	unsigned index = (unsigned)ctx->length & 63;
	ctx->length += size;

	/* fill partial block */
	if (index) {
	unsigned left = md5_block_size - index;
	le32_copy((char*)ctx->message, index, msg, (size < left ? size : left));
	if (size < left) return;

	/* process partial block */
	rhash_md5_process_block(ctx->hash, ctx->message);
	msg += left;
	size -= left;
	}
	while (size >= md5_block_size) {
	unsigned* aligned_message_block;
	if (IS_LITTLE_ENDIAN && IS_ALIGNED_32(msg)) {
	/* the most common case is processing a 32-bit aligned message
	on a little-endian CPU without copying it */
	aligned_message_block = (unsigned*)msg;
	} else {
	le32_copy(ctx->message, 0, msg, md5_block_size);
	aligned_message_block = ctx->message;
	}

	rhash_md5_process_block(ctx->hash, aligned_message_block);
	msg += md5_block_size;
	size -= md5_block_size;
	}
	if (size) {
	/* save leftovers */
	le32_copy(ctx->message, 0, msg, size);
	}
	}

	/**
	* Store calculated hash into the given array.
	*
	* @param ctx the algorithm context containing current hashing state
	* @param result calculated hash in binary form
	*/
	void rhash_md5_final(md5_ctx ctx, unsigned char result)
	{
	unsigned index = ((unsigned)ctx->length & 63) >> 2;
	unsigned shift = ((unsigned)ctx->length & 3) * 8;

	/* pad message and run for last block */

	/* append the byte 0x80 to the message */
	ctx->message[index] &= ~(0xFFFFFFFFu << shift);
	ctx->message[index++] ^= 0x80u << shift;

	/* if no room left in the message to store 64-bit message length */
	if (index > 14) {
	/* then fill the rest with zeros and process it */
	while (index < 16) {
	ctx->message[index++] = 0;
	}
	rhash_md5_process_block(ctx->hash, ctx->message);
	index = 0;
	}
	while (index < 14) {
	ctx->message[index++] = 0;
	}
	ctx->message[14] = (unsigned)(ctx->length << 3);
	ctx->message[15] = (unsigned)(ctx->length >> 29);
	rhash_md5_process_block(ctx->hash, ctx->message);

	if (result) le32_copy(result, 0, &ctx->hash, 16);
	}