MD5 - Slightly modified MD5 lib. Allows access to raw b…

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Slightly modified MD5 lib. Allows access to raw binary instead of hexadecimal ascii.

md5.c@0:56e31f50f1e0, 2011-06-19 (annotated)

Committer:: Remco
Date:: Sun Jun 19 16:26:54 2011 +0000
Revision:: 0:56e31f50f1e0

Who changed what in which revision?

User	Revision	Line number	New contents of line
Remco	0:56e31f50f1e0	1	/* MD5
Remco	0:56e31f50f1e0	2	converted to C++ class by Frank Thilo (thilo@unix-ag.org)
Remco	0:56e31f50f1e0	3	for bzflag (http://www.bzflag.org)
Remco	0:56e31f50f1e0	4
Remco	0:56e31f50f1e0	5	based on:
Remco	0:56e31f50f1e0	6
Remco	0:56e31f50f1e0	7	md5.h and md5.c
Remco	0:56e31f50f1e0	8	reference implemantion of RFC 1321
Remco	0:56e31f50f1e0	9
Remco	0:56e31f50f1e0	10	Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
Remco	0:56e31f50f1e0	11	rights reserved.
Remco	0:56e31f50f1e0	12
Remco	0:56e31f50f1e0	13	License to copy and use this software is granted provided that it
Remco	0:56e31f50f1e0	14	is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Remco	0:56e31f50f1e0	15	Algorithm" in all material mentioning or referencing this software
Remco	0:56e31f50f1e0	16	or this function.
Remco	0:56e31f50f1e0	17
Remco	0:56e31f50f1e0	18	License is also granted to make and use derivative works provided
Remco	0:56e31f50f1e0	19	that such works are identified as "derived from the RSA Data
Remco	0:56e31f50f1e0	20	Security, Inc. MD5 Message-Digest Algorithm" in all material
Remco	0:56e31f50f1e0	21	mentioning or referencing the derived work.
Remco	0:56e31f50f1e0	22
Remco	0:56e31f50f1e0	23	RSA Data Security, Inc. makes no representations concerning either
Remco	0:56e31f50f1e0	24	the merchantability of this software or the suitability of this
Remco	0:56e31f50f1e0	25	software for any particular purpose. It is provided "as is"
Remco	0:56e31f50f1e0	26	without express or implied warranty of any kind.
Remco	0:56e31f50f1e0	27
Remco	0:56e31f50f1e0	28	These notices must be retained in any copies of any part of this
Remco	0:56e31f50f1e0	29	documentation and/or software.
Remco	0:56e31f50f1e0	30
Remco	0:56e31f50f1e0	31	*/
Remco	0:56e31f50f1e0	32
Remco	0:56e31f50f1e0	33	/* interface header */
Remco	0:56e31f50f1e0	34	#include "md5.h"
Remco	0:56e31f50f1e0	35
Remco	0:56e31f50f1e0	36	/* system implementation headers */
Remco	0:56e31f50f1e0	37	#include <stdio.h>
Remco	0:56e31f50f1e0	38	#include <string.h>
Remco	0:56e31f50f1e0	39
Remco	0:56e31f50f1e0	40
Remco	0:56e31f50f1e0	41	// Constants for MD5Transform routine.
Remco	0:56e31f50f1e0	42	#define S11 7
Remco	0:56e31f50f1e0	43	#define S12 12
Remco	0:56e31f50f1e0	44	#define S13 17
Remco	0:56e31f50f1e0	45	#define S14 22
Remco	0:56e31f50f1e0	46	#define S21 5
Remco	0:56e31f50f1e0	47	#define S22 9
Remco	0:56e31f50f1e0	48	#define S23 14
Remco	0:56e31f50f1e0	49	#define S24 20
Remco	0:56e31f50f1e0	50	#define S31 4
Remco	0:56e31f50f1e0	51	#define S32 11
Remco	0:56e31f50f1e0	52	#define S33 16
Remco	0:56e31f50f1e0	53	#define S34 23
Remco	0:56e31f50f1e0	54	#define S41 6
Remco	0:56e31f50f1e0	55	#define S42 10
Remco	0:56e31f50f1e0	56	#define S43 15
Remco	0:56e31f50f1e0	57	#define S44 21
Remco	0:56e31f50f1e0	58
Remco	0:56e31f50f1e0	59	///////////////////////////////////////////////
Remco	0:56e31f50f1e0	60
Remco	0:56e31f50f1e0	61	// F, G, H and I are basic MD5 functions.
Remco	0:56e31f50f1e0	62	inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) {
Remco	0:56e31f50f1e0	63	return x&y \| ~x&z;
Remco	0:56e31f50f1e0	64	}
Remco	0:56e31f50f1e0	65
Remco	0:56e31f50f1e0	66	inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) {
Remco	0:56e31f50f1e0	67	return x&z \| y&~z;
Remco	0:56e31f50f1e0	68	}
Remco	0:56e31f50f1e0	69
Remco	0:56e31f50f1e0	70	inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) {
Remco	0:56e31f50f1e0	71	return x^y^z;
Remco	0:56e31f50f1e0	72	}
Remco	0:56e31f50f1e0	73
Remco	0:56e31f50f1e0	74	inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) {
Remco	0:56e31f50f1e0	75	return y ^ (x \| ~z);
Remco	0:56e31f50f1e0	76	}
Remco	0:56e31f50f1e0	77
Remco	0:56e31f50f1e0	78	// rotate_left rotates x left n bits.
Remco	0:56e31f50f1e0	79	inline MD5::uint4 MD5::rotate_left(uint4 x, int n) {
Remco	0:56e31f50f1e0	80	return (x << n) \| (x >> (32-n));
Remco	0:56e31f50f1e0	81	}
Remco	0:56e31f50f1e0	82
Remco	0:56e31f50f1e0	83	// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Remco	0:56e31f50f1e0	84	// Rotation is separate from addition to prevent recomputation.
Remco	0:56e31f50f1e0	85	inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
Remco	0:56e31f50f1e0	86	a = rotate_left(a+ F(b,c,d) + x + ac, s) + b;
Remco	0:56e31f50f1e0	87	}
Remco	0:56e31f50f1e0	88
Remco	0:56e31f50f1e0	89	inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
Remco	0:56e31f50f1e0	90	a = rotate_left(a + G(b,c,d) + x + ac, s) + b;
Remco	0:56e31f50f1e0	91	}
Remco	0:56e31f50f1e0	92
Remco	0:56e31f50f1e0	93	inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
Remco	0:56e31f50f1e0	94	a = rotate_left(a + H(b,c,d) + x + ac, s) + b;
Remco	0:56e31f50f1e0	95	}
Remco	0:56e31f50f1e0	96
Remco	0:56e31f50f1e0	97	inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
Remco	0:56e31f50f1e0	98	a = rotate_left(a + I(b,c,d) + x + ac, s) + b;
Remco	0:56e31f50f1e0	99	}
Remco	0:56e31f50f1e0	100
Remco	0:56e31f50f1e0	101	//////////////////////////////////////////////
Remco	0:56e31f50f1e0	102
Remco	0:56e31f50f1e0	103	// default ctor, just initailize
Remco	0:56e31f50f1e0	104	MD5::MD5()
Remco	0:56e31f50f1e0	105	{
Remco	0:56e31f50f1e0	106	init();
Remco	0:56e31f50f1e0	107	}
Remco	0:56e31f50f1e0	108
Remco	0:56e31f50f1e0	109	//////////////////////////////////////////////
Remco	0:56e31f50f1e0	110
Remco	0:56e31f50f1e0	111	// nifty shortcut ctor, compute MD5 for string and finalize it right away
Remco	0:56e31f50f1e0	112	MD5::MD5(const std::string &text)
Remco	0:56e31f50f1e0	113	{
Remco	0:56e31f50f1e0	114	init();
Remco	0:56e31f50f1e0	115	update(text.c_str(), text.length());
Remco	0:56e31f50f1e0	116	finalize();
Remco	0:56e31f50f1e0	117	}
Remco	0:56e31f50f1e0	118
Remco	0:56e31f50f1e0	119	//////////////////////////////
Remco	0:56e31f50f1e0	120
Remco	0:56e31f50f1e0	121	void MD5::init()
Remco	0:56e31f50f1e0	122	{
Remco	0:56e31f50f1e0	123	finalized=false;
Remco	0:56e31f50f1e0	124
Remco	0:56e31f50f1e0	125	count[0] = 0;
Remco	0:56e31f50f1e0	126	count[1] = 0;
Remco	0:56e31f50f1e0	127
Remco	0:56e31f50f1e0	128	// load magic initialization constants.
Remco	0:56e31f50f1e0	129	state[0] = 0x67452301;
Remco	0:56e31f50f1e0	130	state[1] = 0xefcdab89;
Remco	0:56e31f50f1e0	131	state[2] = 0x98badcfe;
Remco	0:56e31f50f1e0	132	state[3] = 0x10325476;
Remco	0:56e31f50f1e0	133	}
Remco	0:56e31f50f1e0	134
Remco	0:56e31f50f1e0	135	//////////////////////////////
Remco	0:56e31f50f1e0	136
Remco	0:56e31f50f1e0	137	// decodes input (unsigned char) into output (uint4). Assumes len is a multiple of 4.
Remco	0:56e31f50f1e0	138	void MD5::decode(uint4 output[], const uint1 input[], size_type len)
Remco	0:56e31f50f1e0	139	{
Remco	0:56e31f50f1e0	140	for (unsigned int i = 0, j = 0; j < len; i++, j += 4)
Remco	0:56e31f50f1e0	141	output[i] = ((uint4)input[j]) \| (((uint4)input[j+1]) << 8) \|
Remco	0:56e31f50f1e0	142	(((uint4)input[j+2]) << 16) \| (((uint4)input[j+3]) << 24);
Remco	0:56e31f50f1e0	143	}
Remco	0:56e31f50f1e0	144
Remco	0:56e31f50f1e0	145	//////////////////////////////
Remco	0:56e31f50f1e0	146
Remco	0:56e31f50f1e0	147	// encodes input (uint4) into output (unsigned char). Assumes len is
Remco	0:56e31f50f1e0	148	// a multiple of 4.
Remco	0:56e31f50f1e0	149	void MD5::encode(uint1 output[], const uint4 input[], size_type len)
Remco	0:56e31f50f1e0	150	{
Remco	0:56e31f50f1e0	151	for (size_type i = 0, j = 0; j < len; i++, j += 4) {
Remco	0:56e31f50f1e0	152	output[j] = input[i] & 0xff;
Remco	0:56e31f50f1e0	153	output[j+1] = (input[i] >> 8) & 0xff;
Remco	0:56e31f50f1e0	154	output[j+2] = (input[i] >> 16) & 0xff;
Remco	0:56e31f50f1e0	155	output[j+3] = (input[i] >> 24) & 0xff;
Remco	0:56e31f50f1e0	156	}
Remco	0:56e31f50f1e0	157	}
Remco	0:56e31f50f1e0	158
Remco	0:56e31f50f1e0	159	//////////////////////////////
Remco	0:56e31f50f1e0	160
Remco	0:56e31f50f1e0	161	// apply MD5 algo on a block
Remco	0:56e31f50f1e0	162	void MD5::transform(const uint1 block[blocksize])
Remco	0:56e31f50f1e0	163	{
Remco	0:56e31f50f1e0	164	uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
Remco	0:56e31f50f1e0	165	decode (x, block, blocksize);
Remco	0:56e31f50f1e0	166
Remco	0:56e31f50f1e0	167	/* Round 1 */
Remco	0:56e31f50f1e0	168	FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
Remco	0:56e31f50f1e0	169	FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
Remco	0:56e31f50f1e0	170	FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
Remco	0:56e31f50f1e0	171	FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
Remco	0:56e31f50f1e0	172	FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
Remco	0:56e31f50f1e0	173	FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
Remco	0:56e31f50f1e0	174	FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
Remco	0:56e31f50f1e0	175	FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
Remco	0:56e31f50f1e0	176	FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
Remco	0:56e31f50f1e0	177	FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
Remco	0:56e31f50f1e0	178	FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
Remco	0:56e31f50f1e0	179	FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
Remco	0:56e31f50f1e0	180	FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
Remco	0:56e31f50f1e0	181	FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
Remco	0:56e31f50f1e0	182	FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
Remco	0:56e31f50f1e0	183	FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
Remco	0:56e31f50f1e0	184
Remco	0:56e31f50f1e0	185	/* Round 2 */
Remco	0:56e31f50f1e0	186	GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
Remco	0:56e31f50f1e0	187	GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
Remco	0:56e31f50f1e0	188	GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
Remco	0:56e31f50f1e0	189	GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
Remco	0:56e31f50f1e0	190	GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
Remco	0:56e31f50f1e0	191	GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
Remco	0:56e31f50f1e0	192	GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
Remco	0:56e31f50f1e0	193	GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
Remco	0:56e31f50f1e0	194	GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
Remco	0:56e31f50f1e0	195	GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
Remco	0:56e31f50f1e0	196	GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
Remco	0:56e31f50f1e0	197	GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
Remco	0:56e31f50f1e0	198	GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
Remco	0:56e31f50f1e0	199	GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
Remco	0:56e31f50f1e0	200	GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
Remco	0:56e31f50f1e0	201	GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
Remco	0:56e31f50f1e0	202
Remco	0:56e31f50f1e0	203	/* Round 3 */
Remco	0:56e31f50f1e0	204	HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
Remco	0:56e31f50f1e0	205	HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
Remco	0:56e31f50f1e0	206	HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
Remco	0:56e31f50f1e0	207	HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
Remco	0:56e31f50f1e0	208	HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
Remco	0:56e31f50f1e0	209	HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
Remco	0:56e31f50f1e0	210	HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
Remco	0:56e31f50f1e0	211	HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
Remco	0:56e31f50f1e0	212	HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
Remco	0:56e31f50f1e0	213	HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
Remco	0:56e31f50f1e0	214	HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
Remco	0:56e31f50f1e0	215	HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
Remco	0:56e31f50f1e0	216	HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
Remco	0:56e31f50f1e0	217	HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
Remco	0:56e31f50f1e0	218	HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
Remco	0:56e31f50f1e0	219	HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
Remco	0:56e31f50f1e0	220
Remco	0:56e31f50f1e0	221	/* Round 4 */
Remco	0:56e31f50f1e0	222	II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
Remco	0:56e31f50f1e0	223	II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
Remco	0:56e31f50f1e0	224	II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
Remco	0:56e31f50f1e0	225	II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
Remco	0:56e31f50f1e0	226	II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
Remco	0:56e31f50f1e0	227	II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
Remco	0:56e31f50f1e0	228	II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
Remco	0:56e31f50f1e0	229	II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
Remco	0:56e31f50f1e0	230	II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
Remco	0:56e31f50f1e0	231	II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
Remco	0:56e31f50f1e0	232	II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
Remco	0:56e31f50f1e0	233	II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
Remco	0:56e31f50f1e0	234	II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
Remco	0:56e31f50f1e0	235	II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
Remco	0:56e31f50f1e0	236	II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
Remco	0:56e31f50f1e0	237	II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
Remco	0:56e31f50f1e0	238
Remco	0:56e31f50f1e0	239	state[0] += a;
Remco	0:56e31f50f1e0	240	state[1] += b;
Remco	0:56e31f50f1e0	241	state[2] += c;
Remco	0:56e31f50f1e0	242	state[3] += d;
Remco	0:56e31f50f1e0	243
Remco	0:56e31f50f1e0	244	// Zeroize sensitive information.
Remco	0:56e31f50f1e0	245	memset(x, 0, sizeof x);
Remco	0:56e31f50f1e0	246	}
Remco	0:56e31f50f1e0	247
Remco	0:56e31f50f1e0	248	//////////////////////////////
Remco	0:56e31f50f1e0	249
Remco	0:56e31f50f1e0	250	// MD5 block update operation. Continues an MD5 message-digest
Remco	0:56e31f50f1e0	251	// operation, processing another message block
Remco	0:56e31f50f1e0	252	void MD5::update(const unsigned char input[], size_type length)
Remco	0:56e31f50f1e0	253	{
Remco	0:56e31f50f1e0	254	// compute number of bytes mod 64
Remco	0:56e31f50f1e0	255	size_type index = count[0] / 8 % blocksize;
Remco	0:56e31f50f1e0	256
Remco	0:56e31f50f1e0	257	// Update number of bits
Remco	0:56e31f50f1e0	258	if ((count[0] += (length << 3)) < (length << 3))
Remco	0:56e31f50f1e0	259	count[1]++;
Remco	0:56e31f50f1e0	260	count[1] += (length >> 29);
Remco	0:56e31f50f1e0	261
Remco	0:56e31f50f1e0	262	// number of bytes we need to fill in buffer
Remco	0:56e31f50f1e0	263	size_type firstpart = 64 - index;
Remco	0:56e31f50f1e0	264
Remco	0:56e31f50f1e0	265	size_type i;
Remco	0:56e31f50f1e0	266
Remco	0:56e31f50f1e0	267	// transform as many times as possible.
Remco	0:56e31f50f1e0	268	if (length >= firstpart)
Remco	0:56e31f50f1e0	269	{
Remco	0:56e31f50f1e0	270	// fill buffer first, transform
Remco	0:56e31f50f1e0	271	memcpy(&buffer[index], input, firstpart);
Remco	0:56e31f50f1e0	272	transform(buffer);
Remco	0:56e31f50f1e0	273
Remco	0:56e31f50f1e0	274	// transform chunks of blocksize (64 bytes)
Remco	0:56e31f50f1e0	275	for (i = firstpart; i + blocksize <= length; i += blocksize)
Remco	0:56e31f50f1e0	276	transform(&input[i]);
Remco	0:56e31f50f1e0	277
Remco	0:56e31f50f1e0	278	index = 0;
Remco	0:56e31f50f1e0	279	}
Remco	0:56e31f50f1e0	280	else
Remco	0:56e31f50f1e0	281	i = 0;
Remco	0:56e31f50f1e0	282
Remco	0:56e31f50f1e0	283	// buffer remaining input
Remco	0:56e31f50f1e0	284	memcpy(&buffer[index], &input[i], length-i);
Remco	0:56e31f50f1e0	285	}
Remco	0:56e31f50f1e0	286
Remco	0:56e31f50f1e0	287	//////////////////////////////
Remco	0:56e31f50f1e0	288
Remco	0:56e31f50f1e0	289	// for convenience provide a verson with signed char
Remco	0:56e31f50f1e0	290	void MD5::update(const char input[], size_type length)
Remco	0:56e31f50f1e0	291	{
Remco	0:56e31f50f1e0	292	update((const unsigned char*)input, length);
Remco	0:56e31f50f1e0	293	}
Remco	0:56e31f50f1e0	294
Remco	0:56e31f50f1e0	295	//////////////////////////////
Remco	0:56e31f50f1e0	296
Remco	0:56e31f50f1e0	297	// MD5 finalization. Ends an MD5 message-digest operation, writing the
Remco	0:56e31f50f1e0	298	// the message digest and zeroizing the context.
Remco	0:56e31f50f1e0	299	MD5& MD5::finalize()
Remco	0:56e31f50f1e0	300	{
Remco	0:56e31f50f1e0	301	static unsigned char padding[64] = {
Remco	0:56e31f50f1e0	302	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Remco	0:56e31f50f1e0	303	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Remco	0:56e31f50f1e0	304	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
Remco	0:56e31f50f1e0	305	};
Remco	0:56e31f50f1e0	306
Remco	0:56e31f50f1e0	307	if (!finalized) {
Remco	0:56e31f50f1e0	308	// Save number of bits
Remco	0:56e31f50f1e0	309	unsigned char bits[8];
Remco	0:56e31f50f1e0	310	encode(bits, count, 8);
Remco	0:56e31f50f1e0	311
Remco	0:56e31f50f1e0	312	// pad out to 56 mod 64.
Remco	0:56e31f50f1e0	313	size_type index = count[0] / 8 % 64;
Remco	0:56e31f50f1e0	314	size_type padLen = (index < 56) ? (56 - index) : (120 - index);
Remco	0:56e31f50f1e0	315	update(padding, padLen);
Remco	0:56e31f50f1e0	316
Remco	0:56e31f50f1e0	317	// Append length (before padding)
Remco	0:56e31f50f1e0	318	update(bits, 8);
Remco	0:56e31f50f1e0	319
Remco	0:56e31f50f1e0	320	// Store state in digest
Remco	0:56e31f50f1e0	321	encode(digest, state, 16);
Remco	0:56e31f50f1e0	322
Remco	0:56e31f50f1e0	323	// Zeroize sensitive information.
Remco	0:56e31f50f1e0	324	memset(buffer, 0, sizeof buffer);
Remco	0:56e31f50f1e0	325	memset(count, 0, sizeof count);
Remco	0:56e31f50f1e0	326
Remco	0:56e31f50f1e0	327	finalized=true;
Remco	0:56e31f50f1e0	328	}
Remco	0:56e31f50f1e0	329
Remco	0:56e31f50f1e0	330	return *this;
Remco	0:56e31f50f1e0	331	}
Remco	0:56e31f50f1e0	332
Remco	0:56e31f50f1e0	333	//////////////////////////////
Remco	0:56e31f50f1e0	334
Remco	0:56e31f50f1e0	335	// return hex representation of digest as string
Remco	0:56e31f50f1e0	336	std::string MD5::hexdigest() const
Remco	0:56e31f50f1e0	337	{
Remco	0:56e31f50f1e0	338	if (!finalized)
Remco	0:56e31f50f1e0	339	return "";
Remco	0:56e31f50f1e0	340
Remco	0:56e31f50f1e0	341	char buf[33];
Remco	0:56e31f50f1e0	342	for (int i=0; i<16; i++)
Remco	0:56e31f50f1e0	343	sprintf(buf+i*2, "%02x", digest[i]);
Remco	0:56e31f50f1e0	344	buf[32]=0;
Remco	0:56e31f50f1e0	345
Remco	0:56e31f50f1e0	346	return std::string(buf);
Remco	0:56e31f50f1e0	347	}
Remco	0:56e31f50f1e0	348
Remco	0:56e31f50f1e0	349	//////////////////////////////
Remco	0:56e31f50f1e0	350
Remco	0:56e31f50f1e0	351	std::string md5(const std::string str)
Remco	0:56e31f50f1e0	352	{
Remco	0:56e31f50f1e0	353	MD5 md5 = MD5(str);
Remco	0:56e31f50f1e0	354
Remco	0:56e31f50f1e0	355	return md5.hexdigest();
Remco	0:56e31f50f1e0	356	}

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Type:	Library
Created:	19 Jun 2011
Imports:	24
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

md5.c@0:56e31f50f1e0, 2011-06-19 (annotated)

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