1 /*
2 * generic message digest layer demonstration program
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 #include "mbedtls/build_info.h"
21
22 #include "mbedtls/platform.h"
23
24 #if defined(MBEDTLS_MD_C) && defined(MBEDTLS_FS_IO)
25 #include "mbedtls/md.h"
26
27 #include <stdio.h>
28 #include <string.h>
29 #endif
30
31 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_FS_IO)
main(void)32 int main(void)
33 {
34 mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_FS_IO not defined.\n");
35 mbedtls_exit(0);
36 }
37 #else
38
39
generic_wrapper(const mbedtls_md_info_t * md_info,char * filename,unsigned char * sum)40 static int generic_wrapper(const mbedtls_md_info_t *md_info, char *filename, unsigned char *sum)
41 {
42 int ret = mbedtls_md_file(md_info, filename, sum);
43
44 if (ret == 1) {
45 mbedtls_fprintf(stderr, "failed to open: %s\n", filename);
46 }
47
48 if (ret == 2) {
49 mbedtls_fprintf(stderr, "failed to read: %s\n", filename);
50 }
51
52 return ret;
53 }
54
generic_print(const mbedtls_md_info_t * md_info,char * filename)55 static int generic_print(const mbedtls_md_info_t *md_info, char *filename)
56 {
57 int i;
58 unsigned char sum[MBEDTLS_MD_MAX_SIZE];
59
60 if (generic_wrapper(md_info, filename, sum) != 0) {
61 return 1;
62 }
63
64 for (i = 0; i < mbedtls_md_get_size(md_info); i++) {
65 mbedtls_printf("%02x", sum[i]);
66 }
67
68 mbedtls_printf(" %s\n", filename);
69 return 0;
70 }
71
generic_check(const mbedtls_md_info_t * md_info,char * filename)72 static int generic_check(const mbedtls_md_info_t *md_info, char *filename)
73 {
74 int i;
75 size_t n;
76 FILE *f;
77 int nb_err1, nb_err2;
78 int nb_tot1, nb_tot2;
79 unsigned char sum[MBEDTLS_MD_MAX_SIZE];
80 char line[1024];
81 char diff;
82 #if defined(__clang_analyzer__)
83 char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1] = { };
84 #else
85 char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1];
86 #endif
87
88 if ((f = fopen(filename, "rb")) == NULL) {
89 mbedtls_printf("failed to open: %s\n", filename);
90 return 1;
91 }
92
93 nb_err1 = nb_err2 = 0;
94 nb_tot1 = nb_tot2 = 0;
95
96 memset(line, 0, sizeof(line));
97
98 n = sizeof(line);
99
100 while (fgets(line, (int) n - 1, f) != NULL) {
101 n = strlen(line);
102
103 if (n < (size_t) 2 * mbedtls_md_get_size(md_info) + 4) {
104 mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name(md_info));
105 continue;
106 }
107
108 if (line[2 * mbedtls_md_get_size(md_info)] != ' ' ||
109 line[2 * mbedtls_md_get_size(md_info) + 1] != ' ') {
110 mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name(md_info));
111 continue;
112 }
113
114 if (line[n - 1] == '\n') {
115 n--; line[n] = '\0';
116 }
117 if (line[n - 1] == '\r') {
118 n--; line[n] = '\0';
119 }
120
121 nb_tot1++;
122
123 if (generic_wrapper(md_info, line + 2 + 2 * mbedtls_md_get_size(md_info), sum) != 0) {
124 nb_err1++;
125 continue;
126 }
127
128 nb_tot2++;
129
130 for (i = 0; i < mbedtls_md_get_size(md_info); i++) {
131 sprintf(buf + i * 2, "%02x", sum[i]);
132 }
133
134 /* Use constant-time buffer comparison */
135 diff = 0;
136 for (i = 0; i < 2 * mbedtls_md_get_size(md_info); i++) {
137 diff |= line[i] ^ buf[i];
138 }
139
140 if (diff != 0) {
141 nb_err2++;
142 mbedtls_fprintf(stderr, "wrong checksum: %s\n", line + 66);
143 }
144
145 n = sizeof(line);
146 }
147
148 if (nb_err1 != 0) {
149 mbedtls_printf("WARNING: %d (out of %d) input files could "
150 "not be read\n", nb_err1, nb_tot1);
151 }
152
153 if (nb_err2 != 0) {
154 mbedtls_printf("WARNING: %d (out of %d) computed checksums did "
155 "not match\n", nb_err2, nb_tot2);
156 }
157
158 fclose(f);
159
160 return nb_err1 != 0 || nb_err2 != 0;
161 }
162
main(int argc,char * argv[])163 int main(int argc, char *argv[])
164 {
165 int ret = 1, i;
166 int exit_code = MBEDTLS_EXIT_FAILURE;
167 const mbedtls_md_info_t *md_info;
168 mbedtls_md_context_t md_ctx;
169
170 mbedtls_md_init(&md_ctx);
171
172 if (argc < 2) {
173 const int *list;
174
175 mbedtls_printf("print mode: generic_sum <mbedtls_md> <file> <file> ...\n");
176 mbedtls_printf("check mode: generic_sum <mbedtls_md> -c <checksum file>\n");
177
178 mbedtls_printf("\nAvailable message digests:\n");
179 list = mbedtls_md_list();
180 while (*list) {
181 md_info = mbedtls_md_info_from_type(*list);
182 mbedtls_printf(" %s\n", mbedtls_md_get_name(md_info));
183 list++;
184 }
185
186 mbedtls_exit(exit_code);
187 }
188
189 /*
190 * Read the MD from the command line
191 */
192 md_info = mbedtls_md_info_from_string(argv[1]);
193 if (md_info == NULL) {
194 mbedtls_fprintf(stderr, "Message Digest '%s' not found\n", argv[1]);
195 mbedtls_exit(exit_code);
196 }
197 if (mbedtls_md_setup(&md_ctx, md_info, 0)) {
198 mbedtls_fprintf(stderr, "Failed to initialize context.\n");
199 mbedtls_exit(exit_code);
200 }
201
202 ret = 0;
203 if (argc == 4 && strcmp("-c", argv[2]) == 0) {
204 ret |= generic_check(md_info, argv[3]);
205 goto exit;
206 }
207
208 for (i = 2; i < argc; i++) {
209 ret |= generic_print(md_info, argv[i]);
210 }
211
212 if (ret == 0) {
213 exit_code = MBEDTLS_EXIT_SUCCESS;
214 }
215
216 exit:
217 mbedtls_md_free(&md_ctx);
218
219 mbedtls_exit(exit_code);
220 }
221 #endif /* MBEDTLS_MD_C && MBEDTLS_FS_IO */
222