[go: up one dir, main page]
Menu ▾ ▴

[r70]: / trunk / libmail / md5sum.c  Maximize  Restore  History

Download this file

260 lines (209 with data), 10.2 kB 

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/* This file is part of libmail.



(c) 2009 - Dimitris Mandalidis <mandas@users.sourceforge.net>



libmail is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

libmail is free software: you can redistribute it and/or modify

(at your option) any later version.



libmail 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.  See the

GNU General Public License for more details.



You should have received a copy of the GNU General Public License

along with libmail.  If not, see <http://www.gnu.org/licenses/>.



*/



#include <config.h>



#ifdef LIBMAIL_USE_APOP



#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdint.h>

#include <strings.h>



#include <assert.h>



struct ctx_t {

	uint32_t A;

	uint32_t B;

	uint32_t C;

	uint32_t D;

};



static void md5_init_ctx(struct ctx_t *ctx) {

	ctx->A = 0x67452301UL;

	ctx->B = 0xefcdab89UL;

	ctx->C = 0x98badcfeUL;

	ctx->D = 0x10325476UL;

}



#define MD5_PAD_BITS(b) ((((b) / 448) << 9) + 448 - (b))



static uint32_t F(uint32_t X, uint32_t Y, uint32_t Z) { 

	return (X & Y) | ((~X) & Z);

}



static uint32_t G(uint32_t X, uint32_t Y, uint32_t Z) { 

	return (X & Z) | (Y & (~Z));

}



static uint32_t H(uint32_t X, uint32_t Y, uint32_t Z) { 

	return X ^ Y ^ Z;

}



static uint32_t I(uint32_t X, uint32_t Y, uint32_t Z) { 

	return Y ^ (X | (~Z));

}



static uint32_t ROL(uint32_t X, uint8_t s) {

	return (X << s) | (X >> (32-s));

}



static uint32_t ROUND1(uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t X, uint8_t s, uint32_t T) { 

	return b + ROL(a + F(b,c,d) + X + T,s);

}



static uint32_t ROUND2(uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t X, uint8_t s, uint32_t T) { 

	return b + ROL(a + G(b,c,d) + X + T,s);

}



static uint32_t ROUND3(uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t X, uint8_t s, uint32_t T) { 

	return b + ROL(a + H(b,c,d) + X + T,s);

}



static uint32_t ROUND4(uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t X, uint8_t s, uint32_t T) { 

	return b + ROL(a + I(b,c,d) + X + T,s);

}



#define REVERSE(x) ((((x) & 0xff) << 24) | (((x) & 0xff00) << 8) | (((x) & 0xff0000) >> 8) | (((x) & 0xff000000) >> 24))



#define POS(i,j) ((i << 4)+j)



#define WRITE_WORD(s, w) \

	( ((unsigned char *) (s)) [0] = ((w) & 0xff), \

	  ((unsigned char *) (s)) [1] = ((w) & 0xff00) >> 8, \

	  ((unsigned char *) (s)) [2] = ((w) & 0xff0000) >> 16, \

	  ((unsigned char *) (s)) [3] = ((w) & 0xff000000) >> 24)







unsigned char *md5_digest(unsigned char *digest, const char *src) {

	

	uint32_t n_pad_bits, n_bits, n_total_bits;

	uint32_t n_32_words, n_16_word_blocks;



	uint32_t n_pad_bytes, n_bytes, n_total_bytes;



	struct ctx_t ctx;

	

	uint32_t i;

	

	uint32_t *M;

	

	uint32_t AA, BB, CC, DD;

	

	// Padding bytes. A maximum of 448 bits, and 64-bit message size will be padded

	uint8_t pad[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 };

	

	uint32_t T[64] = { 	0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL,

  						0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,

  						0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL,

  						0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,

						0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL,

						0xd62f105dUL, 0x2441453UL,  0xd8a1e681UL, 0xe7d3fbc8UL,

						0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL,

						0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,

						0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL,

						0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,

						0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x4881d05UL,

						0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,

						0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL,

						0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,

						0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL,

						0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL };



	unsigned char *buffer; 



	// STEP 1: append pad bits.

	n_bytes = strlen(src);

	n_bits = n_bytes << 3;

	n_pad_bits = MD5_PAD_BITS(n_bits);

	if (n_pad_bits == 0)

		n_pad_bits = 512;

	n_pad_bytes = n_pad_bits >> 3;	

	n_total_bits = n_bits+n_pad_bits+64;

	n_total_bytes = n_total_bits >> 3;

	n_32_words = n_total_bits >> 5;

	n_16_word_blocks = n_32_words >> 4;

	// STEP 2: append length (endianess unsafe)

	buffer = malloc(n_total_bytes);

	assert(buffer != NULL);

	memset(buffer, 0, n_total_bytes);

	memcpy(buffer, src, n_bytes);

	memcpy(buffer+n_bytes, pad, n_pad_bytes);

	WRITE_WORD(buffer+n_bytes+n_pad_bytes, n_bits);

	M = (uint32_t *) buffer;

	// STEP 3:

	md5_init_ctx(&ctx);

	// STEP 4:

	for (i = 0; i < n_16_word_blocks; i++) {

		AA = ctx.A;

		BB = ctx.B;

		CC = ctx.C;

		DD = ctx.D;

		// Round 1

		ctx.A = ROUND1(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,0)], 7,   T[0]);

		ctx.D = ROUND1(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,1)], 12,  T[1]);

		ctx.C = ROUND1(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,2)], 17,  T[2]);

		ctx.B = ROUND1(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,3)], 22,  T[3]);



		ctx.A = ROUND1(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,4)],  7,  T[4]);

		ctx.D = ROUND1(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,5)],  12, T[5]);

		ctx.C = ROUND1(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,6)],  17, T[6]);

		ctx.B = ROUND1(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,7)],  22, T[7]);

		

		ctx.A = ROUND1(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,8)],  7,  T[8]);

		ctx.D = ROUND1(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,9)],  12, T[9]);

		ctx.C = ROUND1(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,10)], 17, T[10]);

		ctx.B = ROUND1(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,11)], 22, T[11]);

		

		ctx.A = ROUND1(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,12)], 7,  T[12]);

		ctx.D = ROUND1(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,13)], 12, T[13]);

		ctx.C = ROUND1(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,14)], 17, T[14]);

		ctx.B = ROUND1(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,15)], 22, T[15]);

		// Round 2

        ctx.A = ROUND2(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,1)],  5,  T[16]);

        ctx.D = ROUND2(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,6)],  9,  T[17]);

        ctx.C = ROUND2(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,11)], 14, T[18]);

        ctx.B = ROUND2(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,0)],  20, T[19]);



        ctx.A = ROUND2(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,5)],  5,  T[20]);

        ctx.D = ROUND2(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,10)], 9,  T[21]);

        ctx.C = ROUND2(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,15)], 14, T[22]);

        ctx.B = ROUND2(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,4)],  20, T[23]);

    

        ctx.A = ROUND2(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,9)],  5,  T[24]);

        ctx.D = ROUND2(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,14)], 9,  T[25]);

        ctx.C = ROUND2(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,3)],  14, T[26]);

        ctx.B = ROUND2(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,8)],  20, T[27]);

    

        ctx.A = ROUND2(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,13)], 5,  T[28]);

        ctx.D = ROUND2(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,2)],  9,  T[29]);

        ctx.C = ROUND2(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,7)],  14, T[30]);

        ctx.B = ROUND2(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,12)], 20, T[31]);

		// Round 3

        ctx.A = ROUND3(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,5)],  4,  T[32]);

        ctx.D = ROUND3(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,8)],  11, T[33]);

        ctx.C = ROUND3(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,11)], 16, T[34]);

        ctx.B = ROUND3(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,14)], 23, T[35]);



        ctx.A = ROUND3(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,1)],  4,  T[36]);

        ctx.D = ROUND3(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,4)],  11, T[37]);

        ctx.C = ROUND3(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,7)],  16, T[38]);

        ctx.B = ROUND3(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,10)], 23, T[39]);

    

        ctx.A = ROUND3(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,13)],  4, T[40]);

        ctx.D = ROUND3(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,0)],  11, T[41]);

        ctx.C = ROUND3(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,3)],  16, T[42]);

        ctx.B = ROUND3(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,6)],  23, T[43]);

    

        ctx.A = ROUND3(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,9)],  4,  T[44]);

        ctx.D = ROUND3(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,12)], 11, T[45]);

        ctx.C = ROUND3(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,15)], 16, T[46]);

        ctx.B = ROUND3(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,2)], 23, T[47]);

		// Round 4

        ctx.A = ROUND4(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,0)],  6,  T[48]);

        ctx.D = ROUND4(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,7)],  10, T[49]);

        ctx.C = ROUND4(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,14)], 15, T[50]);

        ctx.B = ROUND4(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,5)],  21, T[51]);



        ctx.A = ROUND4(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,12)], 6,  T[52]);

        ctx.D = ROUND4(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,3)],  10, T[53]);

        ctx.C = ROUND4(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,10)], 15, T[54]);

        ctx.B = ROUND4(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,1)],  21, T[55]);

    

        ctx.A = ROUND4(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,8)],  6,  T[56]);

        ctx.D = ROUND4(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,15)], 10, T[57]);

        ctx.C = ROUND4(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,6)],  15, T[58]);

        ctx.B = ROUND4(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,13)], 21, T[59]);

    

        ctx.A = ROUND4(ctx.A, ctx.B, ctx.C, ctx.D, M[POS(i,4)],  6,  T[60]);

        ctx.D = ROUND4(ctx.D, ctx.A, ctx.B, ctx.C, M[POS(i,11)], 10, T[61]);

        ctx.C = ROUND4(ctx.C, ctx.D, ctx.A, ctx.B, M[POS(i,2)],  15, T[62]);

        ctx.B = ROUND4(ctx.B, ctx.C, ctx.D, ctx.A, M[POS(i,9)],  21, T[63]);

		// End

		ctx.A += AA;

		ctx.B += BB;

		ctx.C += CC;

		ctx.D += DD;

	}

	free(buffer);

	sprintf((char *) digest, "%08x%08x%08x%08x", REVERSE(ctx.A), REVERSE(ctx.B), REVERSE(ctx.C), REVERSE(ctx.D));

	return digest;

}



#endif