1 /*
2 * RFC 1115/1319 compliant MD2 implementation
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21 /*
22 * The MD2 algorithm was designed by Ron Rivest in 1989.
23 *
24 * http://www.ietf.org/rfc/rfc1115.txt
25 * http://www.ietf.org/rfc/rfc1319.txt
26 */
27
28 #if !defined(MBEDTLS_CONFIG_FILE)
29 #include "mbedtls/config.h"
30 #else
31 #include MBEDTLS_CONFIG_FILE
32 #endif
33
34 #if defined(MBEDTLS_MD2_C)
35
36 #include "mbedtls/md2.h"
37
38 #include <string.h>
39
40 #if defined(MBEDTLS_SELF_TEST)
41 #if defined(MBEDTLS_PLATFORM_C)
42 #include "mbedtls/platform.h"
43 #else
44 #include <stdio.h>
45 #define mbedtls_printf printf
46 #endif /* MBEDTLS_PLATFORM_C */
47 #endif /* MBEDTLS_SELF_TEST */
48
49 #if !defined(MBEDTLS_MD2_ALT)
50
51 /* Implementation that should never be optimized out by the compiler */
mbedtls_zeroize(void * v,size_t n)52 static void mbedtls_zeroize( void *v, size_t n ) {
53 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
54 }
55
56 static const unsigned char PI_SUBST[256] =
57 {
58 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
59 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
60 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
61 0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
62 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
63 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
64 0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
65 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
66 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
67 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
68 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
69 0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
70 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
71 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
72 0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
73 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
74 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
75 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
76 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
77 0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
78 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
79 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
80 0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
81 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
82 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
83 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
84 };
85
mbedtls_md2_init(mbedtls_md2_context * ctx)86 void mbedtls_md2_init( mbedtls_md2_context *ctx )
87 {
88 memset( ctx, 0, sizeof( mbedtls_md2_context ) );
89 }
90
mbedtls_md2_free(mbedtls_md2_context * ctx)91 void mbedtls_md2_free( mbedtls_md2_context *ctx )
92 {
93 if( ctx == NULL )
94 return;
95
96 mbedtls_zeroize( ctx, sizeof( mbedtls_md2_context ) );
97 }
98
mbedtls_md2_clone(mbedtls_md2_context * dst,const mbedtls_md2_context * src)99 void mbedtls_md2_clone( mbedtls_md2_context *dst,
100 const mbedtls_md2_context *src )
101 {
102 *dst = *src;
103 }
104
105 /*
106 * MD2 context setup
107 */
mbedtls_md2_starts(mbedtls_md2_context * ctx)108 void mbedtls_md2_starts( mbedtls_md2_context *ctx )
109 {
110 memset( ctx->cksum, 0, 16 );
111 memset( ctx->state, 0, 46 );
112 memset( ctx->buffer, 0, 16 );
113 ctx->left = 0;
114 }
115
116 #if !defined(MBEDTLS_MD2_PROCESS_ALT)
mbedtls_md2_process(mbedtls_md2_context * ctx)117 void mbedtls_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 #endif /* !MBEDTLS_MD2_PROCESS_ALT */
151
152 /*
153 * MD2 process buffer
154 */
mbedtls_md2_update(mbedtls_md2_context * ctx,const unsigned char * input,size_t ilen)155 void mbedtls_md2_update( mbedtls_md2_context *ctx, const unsigned char *input, size_t ilen )
156 {
157 size_t fill;
158
159 while( ilen > 0 )
160 {
161 if( ctx->left + ilen > 16 )
162 fill = 16 - ctx->left;
163 else
164 fill = ilen;
165
166 memcpy( ctx->buffer + ctx->left, input, fill );
167
168 ctx->left += fill;
169 input += fill;
170 ilen -= fill;
171
172 if( ctx->left == 16 )
173 {
174 ctx->left = 0;
175 mbedtls_md2_process( ctx );
176 }
177 }
178 }
179
180 /*
181 * MD2 final digest
182 */
mbedtls_md2_finish(mbedtls_md2_context * ctx,unsigned char output[16])183 void mbedtls_md2_finish( mbedtls_md2_context *ctx, unsigned char output[16] )
184 {
185 size_t i;
186 unsigned char x;
187
188 x = (unsigned char)( 16 - ctx->left );
189
190 for( i = ctx->left; i < 16; i++ )
191 ctx->buffer[i] = x;
192
193 mbedtls_md2_process( ctx );
194
195 memcpy( ctx->buffer, ctx->cksum, 16 );
196 mbedtls_md2_process( ctx );
197
198 memcpy( output, ctx->state, 16 );
199 }
200
201 #endif /* !MBEDTLS_MD2_ALT */
202
203 /*
204 * output = MD2( input buffer )
205 */
mbedtls_md2(const unsigned char * input,size_t ilen,unsigned char output[16])206 void mbedtls_md2( const unsigned char *input, size_t ilen, unsigned char output[16] )
207 {
208 mbedtls_md2_context ctx;
209
210 mbedtls_md2_init( &ctx );
211 mbedtls_md2_starts( &ctx );
212 mbedtls_md2_update( &ctx, input, ilen );
213 mbedtls_md2_finish( &ctx, output );
214 mbedtls_md2_free( &ctx );
215 }
216
217 #if defined(MBEDTLS_SELF_TEST)
218
219 /*
220 * RFC 1319 test vectors
221 */
222 static const char md2_test_str[7][81] =
223 {
224 { "" },
225 { "a" },
226 { "abc" },
227 { "message digest" },
228 { "abcdefghijklmnopqrstuvwxyz" },
229 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
230 { "12345678901234567890123456789012345678901234567890123456789012" \
231 "345678901234567890" }
232 };
233
234 static const unsigned char md2_test_sum[7][16] =
235 {
236 { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
237 0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
238 { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
239 0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
240 { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
241 0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
242 { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
243 0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
244 { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
245 0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
246 { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
247 0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
248 { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
249 0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
250 };
251
252 /*
253 * Checkup routine
254 */
mbedtls_md2_self_test(int verbose)255 int mbedtls_md2_self_test( int verbose )
256 {
257 int i;
258 unsigned char md2sum[16];
259
260 for( i = 0; i < 7; i++ )
261 {
262 if( verbose != 0 )
263 mbedtls_printf( " MD2 test #%d: ", i + 1 );
264
265 mbedtls_md2( (unsigned char *) md2_test_str[i],
266 strlen( md2_test_str[i] ), md2sum );
267
268 if( memcmp( md2sum, md2_test_sum[i], 16 ) != 0 )
269 {
270 if( verbose != 0 )
271 mbedtls_printf( "failed\n" );
272
273 return( 1 );
274 }
275
276 if( verbose != 0 )
277 mbedtls_printf( "passed\n" );
278 }
279
280 if( verbose != 0 )
281 mbedtls_printf( "\n" );
282
283 return( 0 );
284 }
285
286 #endif /* MBEDTLS_SELF_TEST */
287
288 #endif /* MBEDTLS_MD2_C */
289
