1 /*
2 * RFC 1115/1319 compliant MD2 implementation
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19 /*
20 * The MD2 algorithm was designed by Ron Rivest in 1989.
21 *
22 * http://www.ietf.org/rfc/rfc1115.txt
23 * http://www.ietf.org/rfc/rfc1319.txt
24 */
25
26 #include "common.h"
27
28 #if defined(MBEDTLS_MD2_C)
29
30 #include "mbedtls/md2.h"
31 #include "mbedtls/platform_util.h"
32 #include "mbedtls/error.h"
33
34 #include <string.h>
35
36 #if defined(MBEDTLS_SELF_TEST)
37 #if defined(MBEDTLS_PLATFORM_C)
38 #include "mbedtls/platform.h"
39 #else
40 #include <stdio.h>
41 #define mbedtls_printf printf
42 #endif /* MBEDTLS_PLATFORM_C */
43 #endif /* MBEDTLS_SELF_TEST */
44
45 #if !defined(MBEDTLS_MD2_ALT)
46
47 static const unsigned char PI_SUBST[256] =
48 {
49 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
50 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
51 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
52 0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
53 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
54 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
55 0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
56 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
57 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
58 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
59 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
60 0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
61 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
62 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
63 0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
64 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
65 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
66 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
67 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
68 0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
69 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
70 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
71 0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
72 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
73 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
74 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
75 };
76
mbedtls_md2_init(mbedtls_md2_context * ctx)77 void mbedtls_md2_init( mbedtls_md2_context *ctx )
78 {
79 memset( ctx, 0, sizeof( mbedtls_md2_context ) );
80 }
81
mbedtls_md2_free(mbedtls_md2_context * ctx)82 void mbedtls_md2_free( mbedtls_md2_context *ctx )
83 {
84 if( ctx == NULL )
85 return;
86
87 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_md2_context ) );
88 }
89
mbedtls_md2_clone(mbedtls_md2_context * dst,const mbedtls_md2_context * src)90 void mbedtls_md2_clone( mbedtls_md2_context *dst,
91 const mbedtls_md2_context *src )
92 {
93 *dst = *src;
94 }
95
96 /*
97 * MD2 context setup
98 */
mbedtls_md2_starts_ret(mbedtls_md2_context * ctx)99 int mbedtls_md2_starts_ret( mbedtls_md2_context *ctx )
100 {
101 memset( ctx->cksum, 0, 16 );
102 memset( ctx->state, 0, 46 );
103 memset( ctx->buffer, 0, 16 );
104 ctx->left = 0;
105
106 return( 0 );
107 }
108
109 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_starts(mbedtls_md2_context * ctx)110 void mbedtls_md2_starts( mbedtls_md2_context *ctx )
111 {
112 mbedtls_md2_starts_ret( ctx );
113 }
114 #endif
115
116 #if !defined(MBEDTLS_MD2_PROCESS_ALT)
mbedtls_internal_md2_process(mbedtls_md2_context * ctx)117 int mbedtls_internal_md2_process( mbedtls_md2_context *ctx )
118 {
119 int i, j;
120 unsigned char t = 0;
121
122 for( i = 0; i < 16; i++ )
123 {
124 ctx->state[i + 16] = ctx->buffer[i];
125 ctx->state[i + 32] =
126 (unsigned char)( ctx->buffer[i] ^ ctx->state[i]);
127 }
128
129 for( i = 0; i < 18; i++ )
130 {
131 for( j = 0; j < 48; j++ )
132 {
133 ctx->state[j] = (unsigned char)
134 ( ctx->state[j] ^ PI_SUBST[t] );
135 t = ctx->state[j];
136 }
137
138 t = (unsigned char)( t + i );
139 }
140
141 t = ctx->cksum[15];
142
143 for( i = 0; i < 16; i++ )
144 {
145 ctx->cksum[i] = (unsigned char)
146 ( ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t] );
147 t = ctx->cksum[i];
148 }
149
150 /* Zeroise variables to clear sensitive data from memory. */
151 mbedtls_platform_zeroize( &t, sizeof( t ) );
152
153 return( 0 );
154 }
155
156 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_process(mbedtls_md2_context * ctx)157 void mbedtls_md2_process( mbedtls_md2_context *ctx )
158 {
159 mbedtls_internal_md2_process( ctx );
160 }
161 #endif
162 #endif /* !MBEDTLS_MD2_PROCESS_ALT */
163
164 /*
165 * MD2 process buffer
166 */
mbedtls_md2_update_ret(mbedtls_md2_context * ctx,const unsigned char * input,size_t ilen)167 int mbedtls_md2_update_ret( mbedtls_md2_context *ctx,
168 const unsigned char *input,
169 size_t ilen )
170 {
171 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
172 size_t fill;
173
174 while( ilen > 0 )
175 {
176 if( ilen > 16 - ctx->left )
177 fill = 16 - ctx->left;
178 else
179 fill = ilen;
180
181 memcpy( ctx->buffer + ctx->left, input, fill );
182
183 ctx->left += fill;
184 input += fill;
185 ilen -= fill;
186
187 if( ctx->left == 16 )
188 {
189 ctx->left = 0;
190 if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
191 return( ret );
192 }
193 }
194
195 return( 0 );
196 }
197
198 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_update(mbedtls_md2_context * ctx,const unsigned char * input,size_t ilen)199 void mbedtls_md2_update( mbedtls_md2_context *ctx,
200 const unsigned char *input,
201 size_t ilen )
202 {
203 mbedtls_md2_update_ret( ctx, input, ilen );
204 }
205 #endif
206
207 /*
208 * MD2 final digest
209 */
mbedtls_md2_finish_ret(mbedtls_md2_context * ctx,unsigned char output[16])210 int mbedtls_md2_finish_ret( mbedtls_md2_context *ctx,
211 unsigned char output[16] )
212 {
213 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
214 size_t i;
215 unsigned char x;
216
217 x = (unsigned char)( 16 - ctx->left );
218
219 for( i = ctx->left; i < 16; i++ )
220 ctx->buffer[i] = x;
221
222 if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
223 return( ret );
224
225 memcpy( ctx->buffer, ctx->cksum, 16 );
226 if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
227 return( ret );
228
229 memcpy( output, ctx->state, 16 );
230
231 return( 0 );
232 }
233
234 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_finish(mbedtls_md2_context * ctx,unsigned char output[16])235 void mbedtls_md2_finish( mbedtls_md2_context *ctx,
236 unsigned char output[16] )
237 {
238 mbedtls_md2_finish_ret( ctx, output );
239 }
240 #endif
241
242 #endif /* !MBEDTLS_MD2_ALT */
243
244 /*
245 * output = MD2( input buffer )
246 */
mbedtls_md2_ret(const unsigned char * input,size_t ilen,unsigned char output[16])247 int mbedtls_md2_ret( const unsigned char *input,
248 size_t ilen,
249 unsigned char output[16] )
250 {
251 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
252 mbedtls_md2_context ctx;
253
254 mbedtls_md2_init( &ctx );
255
256 if( ( ret = mbedtls_md2_starts_ret( &ctx ) ) != 0 )
257 goto exit;
258
259 if( ( ret = mbedtls_md2_update_ret( &ctx, input, ilen ) ) != 0 )
260 goto exit;
261
262 if( ( ret = mbedtls_md2_finish_ret( &ctx, output ) ) != 0 )
263 goto exit;
264
265 exit:
266 mbedtls_md2_free( &ctx );
267
268 return( ret );
269 }
270
271 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2(const unsigned char * input,size_t ilen,unsigned char output[16])272 void mbedtls_md2( const unsigned char *input,
273 size_t ilen,
274 unsigned char output[16] )
275 {
276 mbedtls_md2_ret( input, ilen, output );
277 }
278 #endif
279
280 #if defined(MBEDTLS_SELF_TEST)
281
282 /*
283 * RFC 1319 test vectors
284 */
285 static const unsigned char md2_test_str[7][81] =
286 {
287 { "" },
288 { "a" },
289 { "abc" },
290 { "message digest" },
291 { "abcdefghijklmnopqrstuvwxyz" },
292 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
293 { "12345678901234567890123456789012345678901234567890123456789012345678901234567890" }
294 };
295
296 static const size_t md2_test_strlen[7] =
297 {
298 0, 1, 3, 14, 26, 62, 80
299 };
300
301 static const unsigned char md2_test_sum[7][16] =
302 {
303 { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
304 0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
305 { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
306 0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
307 { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
308 0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
309 { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
310 0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
311 { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
312 0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
313 { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
314 0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
315 { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
316 0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
317 };
318
319 /*
320 * Checkup routine
321 */
mbedtls_md2_self_test(int verbose)322 int mbedtls_md2_self_test( int verbose )
323 {
324 int i, ret = 0;
325 unsigned char md2sum[16];
326
327 for( i = 0; i < 7; i++ )
328 {
329 if( verbose != 0 )
330 mbedtls_printf( " MD2 test #%d: ", i + 1 );
331
332 ret = mbedtls_md2_ret( md2_test_str[i], md2_test_strlen[i], md2sum );
333 if( ret != 0 )
334 goto fail;
335
336 if( memcmp( md2sum, md2_test_sum[i], 16 ) != 0 )
337 {
338 ret = 1;
339 goto fail;
340 }
341
342 if( verbose != 0 )
343 mbedtls_printf( "passed\n" );
344 }
345
346 if( verbose != 0 )
347 mbedtls_printf( "\n" );
348
349 return( 0 );
350
351 fail:
352 if( verbose != 0 )
353 mbedtls_printf( "failed\n" );
354
355 return( ret );
356 }
357
358 #endif /* MBEDTLS_SELF_TEST */
359
360 #endif /* MBEDTLS_MD2_C */
361