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Paul Bakker5121ce52009-01-03 21:22:43 +00001/*
2 * RFC 1115/1319 compliant MD2 implementation
3 *
Paul Bakker84f12b72010-07-18 10:13:04 +00004 * Copyright (C) 2006-2010, Brainspark B.V.
Paul Bakkerb96f1542010-07-18 20:36:00 +00005 *
6 * This file is part of PolarSSL (http://www.polarssl.org)
Paul Bakker84f12b72010-07-18 10:13:04 +00007 * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
Paul Bakkerb96f1542010-07-18 20:36:00 +00008 *
Paul Bakker77b385e2009-07-28 17:23:11 +00009 * All rights reserved.
Paul Bakkere0ccd0a2009-01-04 16:27:10 +000010 *
Paul Bakker5121ce52009-01-03 21:22:43 +000011 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 */
25/*
26 * The MD2 algorithm was designed by Ron Rivest in 1989.
27 *
28 * http://www.ietf.org/rfc/rfc1115.txt
29 * http://www.ietf.org/rfc/rfc1319.txt
30 */
31
Paul Bakker40e46942009-01-03 21:51:57 +000032#include "polarssl/config.h"
Paul Bakker5121ce52009-01-03 21:22:43 +000033
Paul Bakker40e46942009-01-03 21:51:57 +000034#if defined(POLARSSL_MD2_C)
Paul Bakker5121ce52009-01-03 21:22:43 +000035
Paul Bakker40e46942009-01-03 21:51:57 +000036#include "polarssl/md2.h"
Paul Bakker5121ce52009-01-03 21:22:43 +000037
38#include <string.h>
39#include <stdio.h>
40
41static const unsigned char PI_SUBST[256] =
42{
43 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
44 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
45 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
46 0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
47 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
48 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
49 0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
50 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
51 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
52 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
53 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
54 0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
55 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
56 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
57 0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
58 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
59 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
60 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
61 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
62 0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
63 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
64 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
65 0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
66 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
67 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
68 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
69};
70
71/*
72 * MD2 context setup
73 */
74void md2_starts( md2_context *ctx )
75{
Paul Bakker2fd71f02009-07-11 20:40:58 +000076 memset( ctx->cksum, 0, 16 );
77 memset( ctx->state, 0, 46 );
78 memset( ctx->buffer, 0, 16 );
79 ctx->left = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +000080}
81
82static void md2_process( md2_context *ctx )
83{
84 int i, j;
85 unsigned char t = 0;
86
87 for( i = 0; i < 16; i++ )
88 {
89 ctx->state[i + 16] = ctx->buffer[i];
90 ctx->state[i + 32] =
91 (unsigned char)( ctx->buffer[i] ^ ctx->state[i]);
92 }
93
94 for( i = 0; i < 18; i++ )
95 {
96 for( j = 0; j < 48; j++ )
97 {
98 ctx->state[j] = (unsigned char)
99 ( ctx->state[j] ^ PI_SUBST[t] );
100 t = ctx->state[j];
101 }
102
103 t = (unsigned char)( t + i );
104 }
105
106 t = ctx->cksum[15];
107
108 for( i = 0; i < 16; i++ )
109 {
110 ctx->cksum[i] = (unsigned char)
111 ( ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t] );
112 t = ctx->cksum[i];
113 }
114}
115
116/*
117 * MD2 process buffer
118 */
Paul Bakkerff60ee62010-03-16 21:09:09 +0000119void md2_update( md2_context *ctx, const unsigned char *input, int ilen )
Paul Bakker5121ce52009-01-03 21:22:43 +0000120{
121 int fill;
122
123 while( ilen > 0 )
124 {
125 if( ctx->left + ilen > 16 )
126 fill = 16 - ctx->left;
127 else
128 fill = ilen;
129
130 memcpy( ctx->buffer + ctx->left, input, fill );
131
132 ctx->left += fill;
133 input += fill;
134 ilen -= fill;
135
136 if( ctx->left == 16 )
137 {
138 ctx->left = 0;
139 md2_process( ctx );
140 }
141 }
142}
143
144/*
145 * MD2 final digest
146 */
147void md2_finish( md2_context *ctx, unsigned char output[16] )
148{
149 int i;
150 unsigned char x;
151
152 x = (unsigned char)( 16 - ctx->left );
153
154 for( i = ctx->left; i < 16; i++ )
155 ctx->buffer[i] = x;
156
157 md2_process( ctx );
158
159 memcpy( ctx->buffer, ctx->cksum, 16 );
160 md2_process( ctx );
161
162 memcpy( output, ctx->state, 16 );
163}
164
165/*
166 * output = MD2( input buffer )
167 */
Paul Bakkerff60ee62010-03-16 21:09:09 +0000168void md2( const unsigned char *input, int ilen, unsigned char output[16] )
Paul Bakker5121ce52009-01-03 21:22:43 +0000169{
170 md2_context ctx;
171
172 md2_starts( &ctx );
173 md2_update( &ctx, input, ilen );
174 md2_finish( &ctx, output );
175
176 memset( &ctx, 0, sizeof( md2_context ) );
177}
178
179/*
180 * output = MD2( file contents )
181 */
Paul Bakkerff60ee62010-03-16 21:09:09 +0000182int md2_file( const char *path, unsigned char output[16] )
Paul Bakker5121ce52009-01-03 21:22:43 +0000183{
184 FILE *f;
185 size_t n;
186 md2_context ctx;
187 unsigned char buf[1024];
188
189 if( ( f = fopen( path, "rb" ) ) == NULL )
190 return( 1 );
191
192 md2_starts( &ctx );
193
194 while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
195 md2_update( &ctx, buf, (int) n );
196
197 md2_finish( &ctx, output );
198
199 memset( &ctx, 0, sizeof( md2_context ) );
200
201 if( ferror( f ) != 0 )
202 {
203 fclose( f );
204 return( 2 );
205 }
206
207 fclose( f );
208 return( 0 );
209}
210
211/*
212 * MD2 HMAC context setup
213 */
Paul Bakkerff60ee62010-03-16 21:09:09 +0000214void md2_hmac_starts( md2_context *ctx, const unsigned char *key, int keylen )
Paul Bakker5121ce52009-01-03 21:22:43 +0000215{
216 int i;
217 unsigned char sum[16];
218
219 if( keylen > 64 )
220 {
221 md2( key, keylen, sum );
222 keylen = 16;
223 key = sum;
224 }
225
226 memset( ctx->ipad, 0x36, 64 );
227 memset( ctx->opad, 0x5C, 64 );
228
229 for( i = 0; i < keylen; i++ )
230 {
231 ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );
232 ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );
233 }
234
235 md2_starts( ctx );
236 md2_update( ctx, ctx->ipad, 64 );
237
238 memset( sum, 0, sizeof( sum ) );
239}
240
241/*
242 * MD2 HMAC process buffer
243 */
Paul Bakkerff60ee62010-03-16 21:09:09 +0000244void md2_hmac_update( md2_context *ctx, const unsigned char *input, int ilen )
Paul Bakker5121ce52009-01-03 21:22:43 +0000245{
246 md2_update( ctx, input, ilen );
247}
248
249/*
250 * MD2 HMAC final digest
251 */
252void md2_hmac_finish( md2_context *ctx, unsigned char output[16] )
253{
254 unsigned char tmpbuf[16];
255
256 md2_finish( ctx, tmpbuf );
257 md2_starts( ctx );
258 md2_update( ctx, ctx->opad, 64 );
259 md2_update( ctx, tmpbuf, 16 );
260 md2_finish( ctx, output );
261
262 memset( tmpbuf, 0, sizeof( tmpbuf ) );
263}
264
265/*
Paul Bakker7d3b6612010-03-21 16:23:13 +0000266 * MD2 HMAC context reset
267 */
268void md2_hmac_reset( md2_context *ctx )
269{
270 md2_starts( ctx );
271 md2_update( ctx, ctx->ipad, 64 );
272}
273
274/*
Paul Bakker5121ce52009-01-03 21:22:43 +0000275 * output = HMAC-MD2( hmac key, input buffer )
276 */
Paul Bakkerff60ee62010-03-16 21:09:09 +0000277void md2_hmac( const unsigned char *key, int keylen,
278 const unsigned char *input, int ilen,
Paul Bakker5121ce52009-01-03 21:22:43 +0000279 unsigned char output[16] )
280{
281 md2_context ctx;
282
283 md2_hmac_starts( &ctx, key, keylen );
284 md2_hmac_update( &ctx, input, ilen );
285 md2_hmac_finish( &ctx, output );
286
287 memset( &ctx, 0, sizeof( md2_context ) );
288}
289
Paul Bakker40e46942009-01-03 21:51:57 +0000290#if defined(POLARSSL_SELF_TEST)
Paul Bakker5121ce52009-01-03 21:22:43 +0000291
292/*
293 * RFC 1319 test vectors
294 */
295static const char md2_test_str[7][81] =
296{
297 { "" },
298 { "a" },
299 { "abc" },
300 { "message digest" },
301 { "abcdefghijklmnopqrstuvwxyz" },
302 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
303 { "12345678901234567890123456789012345678901234567890123456789012" \
304 "345678901234567890" }
305};
306
307static const unsigned char md2_test_sum[7][16] =
308{
309 { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
310 0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
311 { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
312 0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
313 { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
314 0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
315 { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
316 0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
317 { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
318 0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
319 { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
320 0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
321 { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
322 0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
323};
324
325/*
326 * Checkup routine
327 */
328int md2_self_test( int verbose )
329{
330 int i;
331 unsigned char md2sum[16];
332
333 for( i = 0; i < 7; i++ )
334 {
335 if( verbose != 0 )
336 printf( " MD2 test #%d: ", i + 1 );
337
338 md2( (unsigned char *) md2_test_str[i],
339 strlen( md2_test_str[i] ), md2sum );
340
341 if( memcmp( md2sum, md2_test_sum[i], 16 ) != 0 )
342 {
343 if( verbose != 0 )
344 printf( "failed\n" );
345
346 return( 1 );
347 }
348
349 if( verbose != 0 )
350 printf( "passed\n" );
351 }
352
353 if( verbose != 0 )
354 printf( "\n" );
355
356 return( 0 );
357}
358
359#endif
360
361#endif