1 /*
2 * generic message digest layer demonstration program
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 */
7
8 #if !defined(MBEDTLS_CONFIG_FILE)
9 #include "mbedtls/config.h"
10 #else
11 #include MBEDTLS_CONFIG_FILE
12 #endif
13
14 #include "mbedtls/platform.h"
15
16 #if defined(MBEDTLS_MD_C) && defined(MBEDTLS_FS_IO)
17 #include "mbedtls/md.h"
18
19 #include <stdio.h>
20 #include <string.h>
21 #endif
22
23 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_FS_IO)
main(void)24 int main(void)
25 {
26 mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_FS_IO not defined.\n");
27 mbedtls_exit(0);
28 }
29 #else
30
31
generic_wrapper(const mbedtls_md_info_t * md_info,char * filename,unsigned char * sum)32 static int generic_wrapper(const mbedtls_md_info_t *md_info, char *filename, unsigned char *sum)
33 {
34 int ret = mbedtls_md_file(md_info, filename, sum);
35
36 if (ret == 1) {
37 mbedtls_fprintf(stderr, "failed to open: %s\n", filename);
38 }
39
40 if (ret == 2) {
41 mbedtls_fprintf(stderr, "failed to read: %s\n", filename);
42 }
43
44 return ret;
45 }
46
generic_print(const mbedtls_md_info_t * md_info,char * filename)47 static int generic_print(const mbedtls_md_info_t *md_info, char *filename)
48 {
49 int i;
50 unsigned char sum[MBEDTLS_MD_MAX_SIZE];
51
52 if (generic_wrapper(md_info, filename, sum) != 0) {
53 return 1;
54 }
55
56 for (i = 0; i < mbedtls_md_get_size(md_info); i++) {
57 mbedtls_printf("%02x", sum[i]);
58 }
59
60 mbedtls_printf(" %s\n", filename);
61 return 0;
62 }
63
generic_check(const mbedtls_md_info_t * md_info,char * filename)64 static int generic_check(const mbedtls_md_info_t *md_info, char *filename)
65 {
66 int i;
67 size_t n;
68 FILE *f;
69 int nb_err1, nb_err2;
70 int nb_tot1, nb_tot2;
71 unsigned char sum[MBEDTLS_MD_MAX_SIZE];
72 char line[1024];
73 char diff;
74 #if defined(__clang_analyzer__)
75 char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1] = { };
76 #else
77 char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1];
78 #endif
79
80 if ((f = fopen(filename, "rb")) == NULL) {
81 mbedtls_printf("failed to open: %s\n", filename);
82 return 1;
83 }
84
85 nb_err1 = nb_err2 = 0;
86 nb_tot1 = nb_tot2 = 0;
87
88 memset(line, 0, sizeof(line));
89
90 n = sizeof(line);
91
92 while (fgets(line, (int) n - 1, f) != NULL) {
93 n = strlen(line);
94
95 if (n < (size_t) 2 * mbedtls_md_get_size(md_info) + 4) {
96 mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name(md_info));
97 continue;
98 }
99
100 if (line[2 * mbedtls_md_get_size(md_info)] != ' ' ||
101 line[2 * mbedtls_md_get_size(md_info) + 1] != ' ') {
102 mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name(md_info));
103 continue;
104 }
105
106 if (line[n - 1] == '\n') {
107 n--; line[n] = '\0';
108 }
109 if (line[n - 1] == '\r') {
110 n--; line[n] = '\0';
111 }
112
113 nb_tot1++;
114
115 if (generic_wrapper(md_info, line + 2 + 2 * mbedtls_md_get_size(md_info), sum) != 0) {
116 nb_err1++;
117 continue;
118 }
119
120 nb_tot2++;
121
122 for (i = 0; i < mbedtls_md_get_size(md_info); i++) {
123 sprintf(buf + i * 2, "%02x", sum[i]);
124 }
125
126 /* Use constant-time buffer comparison */
127 diff = 0;
128 for (i = 0; i < 2 * mbedtls_md_get_size(md_info); i++) {
129 diff |= line[i] ^ buf[i];
130 }
131
132 if (diff != 0) {
133 nb_err2++;
134 mbedtls_fprintf(stderr, "wrong checksum: %s\n", line + 66);
135 }
136
137 n = sizeof(line);
138 }
139
140 if (nb_err1 != 0) {
141 mbedtls_printf("WARNING: %d (out of %d) input files could "
142 "not be read\n", nb_err1, nb_tot1);
143 }
144
145 if (nb_err2 != 0) {
146 mbedtls_printf("WARNING: %d (out of %d) computed checksums did "
147 "not match\n", nb_err2, nb_tot2);
148 }
149
150 fclose(f);
151
152 return nb_err1 != 0 || nb_err2 != 0;
153 }
154
main(int argc,char * argv[])155 int main(int argc, char *argv[])
156 {
157 int ret = 1, i;
158 int exit_code = MBEDTLS_EXIT_FAILURE;
159 const mbedtls_md_info_t *md_info;
160 mbedtls_md_context_t md_ctx;
161
162 mbedtls_md_init(&md_ctx);
163
164 if (argc < 2) {
165 const int *list;
166
167 mbedtls_printf("print mode: generic_sum <mbedtls_md> <file> <file> ...\n");
168 mbedtls_printf("check mode: generic_sum <mbedtls_md> -c <checksum file>\n");
169
170 mbedtls_printf("\nAvailable message digests:\n");
171 list = mbedtls_md_list();
172 while (*list) {
173 md_info = mbedtls_md_info_from_type(*list);
174 mbedtls_printf(" %s\n", mbedtls_md_get_name(md_info));
175 list++;
176 }
177
178 #if defined(_WIN32)
179 mbedtls_printf("\n Press Enter to exit this program.\n");
180 fflush(stdout); getchar();
181 #endif
182
183 mbedtls_exit(exit_code);
184 }
185
186 /*
187 * Read the MD from the command line
188 */
189 md_info = mbedtls_md_info_from_string(argv[1]);
190 if (md_info == NULL) {
191 mbedtls_fprintf(stderr, "Message Digest '%s' not found\n", argv[1]);
192 mbedtls_exit(exit_code);
193 }
194 if (mbedtls_md_setup(&md_ctx, md_info, 0)) {
195 mbedtls_fprintf(stderr, "Failed to initialize context.\n");
196 mbedtls_exit(exit_code);
197 }
198
199 ret = 0;
200 if (argc == 4 && strcmp("-c", argv[2]) == 0) {
201 ret |= generic_check(md_info, argv[3]);
202 goto exit;
203 }
204
205 for (i = 2; i < argc; i++) {
206 ret |= generic_print(md_info, argv[i]);
207 }
208
209 if (ret == 0) {
210 exit_code = MBEDTLS_EXIT_SUCCESS;
211 }
212
213 exit:
214 mbedtls_md_free(&md_ctx);
215
216 mbedtls_exit(exit_code);
217 }
218 #endif /* MBEDTLS_MD_C && MBEDTLS_FS_IO */
219