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(mbedtls_md2_context * ctx)99 int mbedtls_md2_starts( 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_MD2_PROCESS_ALT)
mbedtls_internal_md2_process(mbedtls_md2_context * ctx)110 int mbedtls_internal_md2_process( mbedtls_md2_context *ctx )
111 {
112 int i, j;
113 unsigned char t = 0;
114
115 for( i = 0; i < 16; i++ )
116 {
117 ctx->state[i + 16] = ctx->buffer[i];
118 ctx->state[i + 32] =
119 (unsigned char)( ctx->buffer[i] ^ ctx->state[i]);
120 }
121
122 for( i = 0; i < 18; i++ )
123 {
124 for( j = 0; j < 48; j++ )
125 {
126 ctx->state[j] = (unsigned char)
127 ( ctx->state[j] ^ PI_SUBST[t] );
128 t = ctx->state[j];
129 }
130
131 t = (unsigned char)( t + i );
132 }
133
134 t = ctx->cksum[15];
135
136 for( i = 0; i < 16; i++ )
137 {
138 ctx->cksum[i] = (unsigned char)
139 ( ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t] );
140 t = ctx->cksum[i];
141 }
142
143 /* Zeroise variables to clear sensitive data from memory. */
144 mbedtls_platform_zeroize( &t, sizeof( t ) );
145
146 return( 0 );
147 }
148
149 #endif /* !MBEDTLS_MD2_PROCESS_ALT */
150
151 /*
152 * MD2 process buffer
153 */
mbedtls_md2_update(mbedtls_md2_context * ctx,const unsigned char * input,size_t ilen)154 int mbedtls_md2_update( mbedtls_md2_context *ctx,
155 const unsigned char *input,
156 size_t ilen )
157 {
158 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
159 size_t fill;
160
161 while( ilen > 0 )
162 {
163 if( ilen > 16 - ctx->left )
164 fill = 16 - ctx->left;
165 else
166 fill = ilen;
167
168 memcpy( ctx->buffer + ctx->left, input, fill );
169
170 ctx->left += fill;
171 input += fill;
172 ilen -= fill;
173
174 if( ctx->left == 16 )
175 {
176 ctx->left = 0;
177 if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
178 return( ret );
179 }
180 }
181
182 return( 0 );
183 }
184
185 /*
186 * MD2 final digest
187 */
mbedtls_md2_finish(mbedtls_md2_context * ctx,unsigned char output[16])188 int mbedtls_md2_finish( mbedtls_md2_context *ctx,
189 unsigned char output[16] )
190 {
191 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
192 size_t i;
193 unsigned char x;
194
195 x = (unsigned char)( 16 - ctx->left );
196
197 for( i = ctx->left; i < 16; i++ )
198 ctx->buffer[i] = x;
199
200 if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
201 return( ret );
202
203 memcpy( ctx->buffer, ctx->cksum, 16 );
204 if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
205 return( ret );
206
207 memcpy( output, ctx->state, 16 );
208
209 return( 0 );
210 }
211
212 #endif /* !MBEDTLS_MD2_ALT */
213
214 /*
215 * output = MD2( input buffer )
216 */
mbedtls_md2(const unsigned char * input,size_t ilen,unsigned char output[16])217 int mbedtls_md2( const unsigned char *input,
218 size_t ilen,
219 unsigned char output[16] )
220 {
221 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
222 mbedtls_md2_context ctx;
223
224 mbedtls_md2_init( &ctx );
225
226 if( ( ret = mbedtls_md2_starts( &ctx ) ) != 0 )
227 goto exit;
228
229 if( ( ret = mbedtls_md2_update( &ctx, input, ilen ) ) != 0 )
230 goto exit;
231
232 if( ( ret = mbedtls_md2_finish( &ctx, output ) ) != 0 )
233 goto exit;
234
235 exit:
236 mbedtls_md2_free( &ctx );
237
238 return( ret );
239 }
240
241 #if defined(MBEDTLS_SELF_TEST)
242
243 /*
244 * RFC 1319 test vectors
245 */
246 static const unsigned char md2_test_str[7][81] =
247 {
248 { "" },
249 { "a" },
250 { "abc" },
251 { "message digest" },
252 { "abcdefghijklmnopqrstuvwxyz" },
253 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
254 { "12345678901234567890123456789012345678901234567890123456789012345678901234567890" }
255 };
256
257 static const size_t md2_test_strlen[7] =
258 {
259 0, 1, 3, 14, 26, 62, 80
260 };
261
262 static const unsigned char md2_test_sum[7][16] =
263 {
264 { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
265 0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
266 { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
267 0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
268 { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
269 0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
270 { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
271 0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
272 { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
273 0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
274 { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
275 0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
276 { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
277 0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
278 };
279
280 /*
281 * Checkup routine
282 */
mbedtls_md2_self_test(int verbose)283 int mbedtls_md2_self_test( int verbose )
284 {
285 int i, ret = 0;
286 unsigned char md2sum[16];
287
288 for( i = 0; i < 7; i++ )
289 {
290 if( verbose != 0 )
291 mbedtls_printf( " MD2 test #%d: ", i + 1 );
292
293 ret = mbedtls_md2( md2_test_str[i], md2_test_strlen[i], md2sum );
294 if( ret != 0 )
295 goto fail;
296
297 if( memcmp( md2sum, md2_test_sum[i], 16 ) != 0 )
298 {
299 ret = 1;
300 goto fail;
301 }
302
303 if( verbose != 0 )
304 mbedtls_printf( "passed\n" );
305 }
306
307 if( verbose != 0 )
308 mbedtls_printf( "\n" );
309
310 return( 0 );
311
312 fail:
313 if( verbose != 0 )
314 mbedtls_printf( "failed\n" );
315
316 return( ret );
317 }
318
319 #endif /* MBEDTLS_SELF_TEST */
320
321 #endif /* MBEDTLS_MD2_C */