1 /*
2 * RFC 1115/1319 compliant MD2 implementation
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 */
7 /*
8 * The MD2 algorithm was designed by Ron Rivest in 1989.
9 *
10 * http://www.ietf.org/rfc/rfc1115.txt
11 * http://www.ietf.org/rfc/rfc1319.txt
12 */
13
14 #include "common.h"
15
16 #if defined(MBEDTLS_MD2_C)
17
18 #include "mbedtls/md2.h"
19 #include "mbedtls/platform_util.h"
20 #include "mbedtls/error.h"
21
22 #include <string.h>
23
24 #include "mbedtls/platform.h"
25
26 #if !defined(MBEDTLS_MD2_ALT)
27
28 static const unsigned char PI_SUBST[256] =
29 {
30 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
31 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
32 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
33 0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
34 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
35 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
36 0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
37 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
38 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
39 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
40 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
41 0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
42 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
43 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
44 0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
45 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
46 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
47 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
48 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
49 0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
50 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
51 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
52 0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
53 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
54 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
55 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
56 };
57
mbedtls_md2_init(mbedtls_md2_context * ctx)58 void mbedtls_md2_init(mbedtls_md2_context *ctx)
59 {
60 memset(ctx, 0, sizeof(mbedtls_md2_context));
61 }
62
mbedtls_md2_free(mbedtls_md2_context * ctx)63 void mbedtls_md2_free(mbedtls_md2_context *ctx)
64 {
65 if (ctx == NULL) {
66 return;
67 }
68
69 mbedtls_platform_zeroize(ctx, sizeof(mbedtls_md2_context));
70 }
71
mbedtls_md2_clone(mbedtls_md2_context * dst,const mbedtls_md2_context * src)72 void mbedtls_md2_clone(mbedtls_md2_context *dst,
73 const mbedtls_md2_context *src)
74 {
75 *dst = *src;
76 }
77
78 /*
79 * MD2 context setup
80 */
mbedtls_md2_starts_ret(mbedtls_md2_context * ctx)81 int mbedtls_md2_starts_ret(mbedtls_md2_context *ctx)
82 {
83 memset(ctx->cksum, 0, 16);
84 memset(ctx->state, 0, 46);
85 memset(ctx->buffer, 0, 16);
86 ctx->left = 0;
87
88 return 0;
89 }
90
91 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_starts(mbedtls_md2_context * ctx)92 void mbedtls_md2_starts(mbedtls_md2_context *ctx)
93 {
94 mbedtls_md2_starts_ret(ctx);
95 }
96 #endif
97
98 #if !defined(MBEDTLS_MD2_PROCESS_ALT)
mbedtls_internal_md2_process(mbedtls_md2_context * ctx)99 int mbedtls_internal_md2_process(mbedtls_md2_context *ctx)
100 {
101 int i, j;
102 unsigned char t = 0;
103
104 for (i = 0; i < 16; i++) {
105 ctx->state[i + 16] = ctx->buffer[i];
106 ctx->state[i + 32] =
107 (unsigned char) (ctx->buffer[i] ^ ctx->state[i]);
108 }
109
110 for (i = 0; i < 18; i++) {
111 for (j = 0; j < 48; j++) {
112 ctx->state[j] = (unsigned char)
113 (ctx->state[j] ^ PI_SUBST[t]);
114 t = ctx->state[j];
115 }
116
117 t = (unsigned char) (t + i);
118 }
119
120 t = ctx->cksum[15];
121
122 for (i = 0; i < 16; i++) {
123 ctx->cksum[i] = (unsigned char)
124 (ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t]);
125 t = ctx->cksum[i];
126 }
127
128 /* Zeroise variables to clear sensitive data from memory. */
129 mbedtls_platform_zeroize(&t, sizeof(t));
130
131 return 0;
132 }
133
134 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_process(mbedtls_md2_context * ctx)135 void mbedtls_md2_process(mbedtls_md2_context *ctx)
136 {
137 mbedtls_internal_md2_process(ctx);
138 }
139 #endif
140 #endif /* !MBEDTLS_MD2_PROCESS_ALT */
141
142 /*
143 * MD2 process buffer
144 */
mbedtls_md2_update_ret(mbedtls_md2_context * ctx,const unsigned char * input,size_t ilen)145 int mbedtls_md2_update_ret(mbedtls_md2_context *ctx,
146 const unsigned char *input,
147 size_t ilen)
148 {
149 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
150 size_t fill;
151
152 while (ilen > 0) {
153 if (ilen > 16 - ctx->left) {
154 fill = 16 - ctx->left;
155 } else {
156 fill = ilen;
157 }
158
159 memcpy(ctx->buffer + ctx->left, input, fill);
160
161 ctx->left += fill;
162 input += fill;
163 ilen -= fill;
164
165 if (ctx->left == 16) {
166 ctx->left = 0;
167 if ((ret = mbedtls_internal_md2_process(ctx)) != 0) {
168 return ret;
169 }
170 }
171 }
172
173 return 0;
174 }
175
176 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_update(mbedtls_md2_context * ctx,const unsigned char * input,size_t ilen)177 void mbedtls_md2_update(mbedtls_md2_context *ctx,
178 const unsigned char *input,
179 size_t ilen)
180 {
181 mbedtls_md2_update_ret(ctx, input, ilen);
182 }
183 #endif
184
185 /*
186 * MD2 final digest
187 */
mbedtls_md2_finish_ret(mbedtls_md2_context * ctx,unsigned char output[16])188 int mbedtls_md2_finish_ret(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
201 if ((ret = mbedtls_internal_md2_process(ctx)) != 0) {
202 return ret;
203 }
204
205 memcpy(ctx->buffer, ctx->cksum, 16);
206 if ((ret = mbedtls_internal_md2_process(ctx)) != 0) {
207 return ret;
208 }
209
210 memcpy(output, ctx->state, 16);
211
212 return 0;
213 }
214
215 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2_finish(mbedtls_md2_context * ctx,unsigned char output[16])216 void mbedtls_md2_finish(mbedtls_md2_context *ctx,
217 unsigned char output[16])
218 {
219 mbedtls_md2_finish_ret(ctx, output);
220 }
221 #endif
222
223 #endif /* !MBEDTLS_MD2_ALT */
224
225 /*
226 * output = MD2( input buffer )
227 */
mbedtls_md2_ret(const unsigned char * input,size_t ilen,unsigned char output[16])228 int mbedtls_md2_ret(const unsigned char *input,
229 size_t ilen,
230 unsigned char output[16])
231 {
232 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
233 mbedtls_md2_context ctx;
234
235 mbedtls_md2_init(&ctx);
236
237 if ((ret = mbedtls_md2_starts_ret(&ctx)) != 0) {
238 goto exit;
239 }
240
241 if ((ret = mbedtls_md2_update_ret(&ctx, input, ilen)) != 0) {
242 goto exit;
243 }
244
245 if ((ret = mbedtls_md2_finish_ret(&ctx, output)) != 0) {
246 goto exit;
247 }
248
249 exit:
250 mbedtls_md2_free(&ctx);
251
252 return ret;
253 }
254
255 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_md2(const unsigned char * input,size_t ilen,unsigned char output[16])256 void mbedtls_md2(const unsigned char *input,
257 size_t ilen,
258 unsigned char output[16])
259 {
260 mbedtls_md2_ret(input, ilen, output);
261 }
262 #endif
263
264 #if defined(MBEDTLS_SELF_TEST)
265
266 /*
267 * RFC 1319 test vectors
268 */
269 static const unsigned char md2_test_str[7][81] =
270 {
271 { "" },
272 { "a" },
273 { "abc" },
274 { "message digest" },
275 { "abcdefghijklmnopqrstuvwxyz" },
276 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
277 { "12345678901234567890123456789012345678901234567890123456789012345678901234567890" }
278 };
279
280 static const size_t md2_test_strlen[7] =
281 {
282 0, 1, 3, 14, 26, 62, 80
283 };
284
285 static const unsigned char md2_test_sum[7][16] =
286 {
287 { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
288 0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
289 { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
290 0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
291 { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
292 0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
293 { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
294 0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
295 { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
296 0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
297 { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
298 0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
299 { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
300 0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
301 };
302
303 /*
304 * Checkup routine
305 */
mbedtls_md2_self_test(int verbose)306 int mbedtls_md2_self_test(int verbose)
307 {
308 int i, ret = 0;
309 unsigned char md2sum[16];
310
311 for (i = 0; i < 7; i++) {
312 if (verbose != 0) {
313 mbedtls_printf(" MD2 test #%d: ", i + 1);
314 }
315
316 ret = mbedtls_md2_ret(md2_test_str[i], md2_test_strlen[i], md2sum);
317 if (ret != 0) {
318 goto fail;
319 }
320
321 if (memcmp(md2sum, md2_test_sum[i], 16) != 0) {
322 ret = 1;
323 goto fail;
324 }
325
326 if (verbose != 0) {
327 mbedtls_printf("passed\n");
328 }
329 }
330
331 if (verbose != 0) {
332 mbedtls_printf("\n");
333 }
334
335 return 0;
336
337 fail:
338 if (verbose != 0) {
339 mbedtls_printf("failed\n");
340 }
341
342 return ret;
343 }
344
345 #endif /* MBEDTLS_SELF_TEST */
346
347 #endif /* MBEDTLS_MD2_C */
348