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#include "mbedtls/platform.h"
37
38#if !defined(MBEDTLS_MD2_ALT)
39
40static const unsigned char PI_SUBST[256] =
41{
42 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
43 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
44 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
45 0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
46 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
47 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
48 0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
49 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
50 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
51 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
52 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
53 0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
54 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
55 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
56 0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
57 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
58 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
59 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
60 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
61 0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
62 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
63 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
64 0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
65 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
66 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
67 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
68};
69
70void mbedtls_md2_init(mbedtls_md2_context *ctx)
71{
72 memset(ctx, 0, sizeof(mbedtls_md2_context));
73}
74
75void mbedtls_md2_free(mbedtls_md2_context *ctx)
76{
77 if (ctx == NULL) {
78 return;
79 }
80
81 mbedtls_platform_zeroize(ctx, sizeof(mbedtls_md2_context));
82}
83
84void mbedtls_md2_clone(mbedtls_md2_context *dst,
85 const mbedtls_md2_context *src)
86{
87 *dst = *src;
88}
89
90/*
91 * MD2 context setup
92 */
93int mbedtls_md2_starts_ret(mbedtls_md2_context *ctx)
94{
95 memset(ctx->cksum, 0, 16);
96 memset(ctx->state, 0, 46);
97 memset(ctx->buffer, 0, 16);
98 ctx->left = 0;
99
100 return 0;
101}
102
103#if !defined(MBEDTLS_DEPRECATED_REMOVED)
104void mbedtls_md2_starts(mbedtls_md2_context *ctx)
105{
106 mbedtls_md2_starts_ret(ctx);
107}
108#endif
109
110#if !defined(MBEDTLS_MD2_PROCESS_ALT)
111int mbedtls_internal_md2_process(mbedtls_md2_context *ctx)
112{
113 int i, j;
114 unsigned char t = 0;
115
116 for (i = 0; i < 16; i++) {
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 for (j = 0; j < 48; j++) {
124 ctx->state[j] = (unsigned char)
125 (ctx->state[j] ^ PI_SUBST[t]);
126 t = ctx->state[j];
127 }
128
129 t = (unsigned char) (t + i);
130 }
131
132 t = ctx->cksum[15];
133
134 for (i = 0; i < 16; i++) {
135 ctx->cksum[i] = (unsigned char)
136 (ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t]);
137 t = ctx->cksum[i];
138 }
139
140 /* Zeroise variables to clear sensitive data from memory. */
141 mbedtls_platform_zeroize(&t, sizeof(t));
142
143 return 0;
144}
145
146#if !defined(MBEDTLS_DEPRECATED_REMOVED)
147void mbedtls_md2_process(mbedtls_md2_context *ctx)
148{
149 mbedtls_internal_md2_process(ctx);
150}
151#endif
152#endif /* !MBEDTLS_MD2_PROCESS_ALT */
153
154/*
155 * MD2 process buffer
156 */
157int mbedtls_md2_update_ret(mbedtls_md2_context *ctx,
158 const unsigned char *input,
159 size_t ilen)
160{
161 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
162 size_t fill;
163
164 while (ilen > 0) {
165 if (ilen > 16 - ctx->left) {
166 fill = 16 - ctx->left;
167 } else {
168 fill = ilen;
169 }
170
171 memcpy(ctx->buffer + ctx->left, input, fill);
172
173 ctx->left += fill;
174 input += fill;
175 ilen -= fill;
176
177 if (ctx->left == 16) {
178 ctx->left = 0;
179 if ((ret = mbedtls_internal_md2_process(ctx)) != 0) {
180 return ret;
181 }
182 }
183 }
184
185 return 0;
186}
187
188#if !defined(MBEDTLS_DEPRECATED_REMOVED)
189void mbedtls_md2_update(mbedtls_md2_context *ctx,
190 const unsigned char *input,
191 size_t ilen)
192{
193 mbedtls_md2_update_ret(ctx, input, ilen);
194}
195#endif
196
197/*
198 * MD2 final digest
199 */
200int mbedtls_md2_finish_ret(mbedtls_md2_context *ctx,
201 unsigned char output[16])
202{
203 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
204 size_t i;
205 unsigned char x;
206
207 x = (unsigned char) (16 - ctx->left);
208
209 for (i = ctx->left; i < 16; i++) {
210 ctx->buffer[i] = x;
211 }
212
213 if ((ret = mbedtls_internal_md2_process(ctx)) != 0) {
214 return ret;
215 }
216
217 memcpy(ctx->buffer, ctx->cksum, 16);
218 if ((ret = mbedtls_internal_md2_process(ctx)) != 0) {
219 return ret;
220 }
221
222 memcpy(output, ctx->state, 16);
223
224 return 0;
225}
226
227#if !defined(MBEDTLS_DEPRECATED_REMOVED)
228void mbedtls_md2_finish(mbedtls_md2_context *ctx,
229 unsigned char output[16])
230{
231 mbedtls_md2_finish_ret(ctx, output);
232}
233#endif
234
235#endif /* !MBEDTLS_MD2_ALT */
236
237/*
238 * output = MD2( input buffer )
239 */
240int mbedtls_md2_ret(const unsigned char *input,
241 size_t ilen,
242 unsigned char output[16])
243{
244 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
245 mbedtls_md2_context ctx;
246
247 mbedtls_md2_init(&ctx);
248
249 if ((ret = mbedtls_md2_starts_ret(&ctx)) != 0) {
250 goto exit;
251 }
252
253 if ((ret = mbedtls_md2_update_ret(&ctx, input, ilen)) != 0) {
254 goto exit;
255 }
256
257 if ((ret = mbedtls_md2_finish_ret(&ctx, output)) != 0) {
258 goto exit;
259 }
260
261exit:
262 mbedtls_md2_free(&ctx);
263
264 return ret;
265}
266
267#if !defined(MBEDTLS_DEPRECATED_REMOVED)
268void mbedtls_md2(const unsigned char *input,
269 size_t ilen,
270 unsigned char output[16])
271{
272 mbedtls_md2_ret(input, ilen, output);
273}
274#endif
275
276#if defined(MBEDTLS_SELF_TEST)
277
278/*
279 * RFC 1319 test vectors
280 */
281static const unsigned char md2_test_str[7][81] =
282{
283 { "" },
284 { "a" },
285 { "abc" },
286 { "message digest" },
287 { "abcdefghijklmnopqrstuvwxyz" },
288 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
289 { "12345678901234567890123456789012345678901234567890123456789012345678901234567890" }
290};
291
292static const size_t md2_test_strlen[7] =
293{
294 0, 1, 3, 14, 26, 62, 80
295};
296
297static const unsigned char md2_test_sum[7][16] =
298{
299 { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
300 0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
301 { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
302 0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
303 { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
304 0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
305 { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
306 0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
307 { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
308 0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
309 { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
310 0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
311 { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
312 0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
313};
314
315/*
316 * Checkup routine
317 */
318int mbedtls_md2_self_test(int verbose)
319{
320 int i, ret = 0;
321 unsigned char md2sum[16];
322
323 for (i = 0; i < 7; i++) {
324 if (verbose != 0) {
325 mbedtls_printf(" MD2 test #%d: ", i + 1);
326 }
327
328 ret = mbedtls_md2_ret(md2_test_str[i], md2_test_strlen[i], md2sum);
329 if (ret != 0) {
330 goto fail;
331 }
332
333 if (memcmp(md2sum, md2_test_sum[i], 16) != 0) {
334 ret = 1;
335 goto fail;
336 }
337
338 if (verbose != 0) {
339 mbedtls_printf("passed\n");
340 }
341 }
342
343 if (verbose != 0) {
344 mbedtls_printf("\n");
345 }
346
347 return 0;
348
349fail:
350 if (verbose != 0) {
351 mbedtls_printf("failed\n");
352 }
353
354 return ret;
355}
356
357#endif /* MBEDTLS_SELF_TEST */
358
359#endif /* MBEDTLS_MD2_C */
360