1 /*
2 * Public key-based signature creation 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_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
25 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
26 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
27 !defined(MBEDTLS_CTR_DRBG_C)
main(void)28 int main(void)
29 {
30 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
31 "MBEDTLS_SHA256_C and/or MBEDTLS_MD_C and/or "
32 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
33 "MBEDTLS_CTR_DRBG_C not defined.\n");
34 mbedtls_exit(0);
35 }
36 #else
37
38 #include "mbedtls/error.h"
39 #include "mbedtls/entropy.h"
40 #include "mbedtls/ctr_drbg.h"
41 #include "mbedtls/md.h"
42 #include "mbedtls/pk.h"
43
44 #include <stdio.h>
45 #include <string.h>
46
main(int argc,char * argv[])47 int main(int argc, char *argv[])
48 {
49 FILE *f;
50 int ret = 1;
51 int exit_code = MBEDTLS_EXIT_FAILURE;
52 mbedtls_pk_context pk;
53 mbedtls_entropy_context entropy;
54 mbedtls_ctr_drbg_context ctr_drbg;
55 unsigned char hash[32];
56 unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
57 char filename[512];
58 const char *pers = "mbedtls_pk_sign";
59 size_t olen = 0;
60
61 mbedtls_entropy_init(&entropy);
62 mbedtls_ctr_drbg_init(&ctr_drbg);
63 mbedtls_pk_init(&pk);
64
65 if (argc != 3) {
66 mbedtls_printf("usage: mbedtls_pk_sign <key_file> <filename>\n");
67
68 #if defined(_WIN32)
69 mbedtls_printf("\n");
70 #endif
71
72 goto exit;
73 }
74
75 mbedtls_printf("\n . Seeding the random number generator...");
76 fflush(stdout);
77
78 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
79 (const unsigned char *) pers,
80 strlen(pers))) != 0) {
81 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
82 (unsigned int) -ret);
83 goto exit;
84 }
85
86 mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
87 fflush(stdout);
88
89 if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
90 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
91 mbedtls_printf(" failed\n ! Could not parse '%s'\n", argv[1]);
92 goto exit;
93 }
94
95 /*
96 * Compute the SHA-256 hash of the input file,
97 * then calculate the signature of the hash.
98 */
99 mbedtls_printf("\n . Generating the SHA-256 signature");
100 fflush(stdout);
101
102 if ((ret = mbedtls_md_file(
103 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
104 argv[2], hash)) != 0) {
105 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
106 goto exit;
107 }
108
109 if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
110 buf, sizeof(buf), &olen,
111 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
112 mbedtls_printf(" failed\n ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret);
113 goto exit;
114 }
115
116 /*
117 * Write the signature into <filename>.sig
118 */
119 mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[2]);
120
121 if ((f = fopen(filename, "wb+")) == NULL) {
122 mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
123 goto exit;
124 }
125
126 if (fwrite(buf, 1, olen, f) != olen) {
127 mbedtls_printf("failed\n ! fwrite failed\n\n");
128 fclose(f);
129 goto exit;
130 }
131
132 fclose(f);
133
134 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
135
136 exit_code = MBEDTLS_EXIT_SUCCESS;
137
138 exit:
139 mbedtls_pk_free(&pk);
140 mbedtls_ctr_drbg_free(&ctr_drbg);
141 mbedtls_entropy_free(&entropy);
142
143 #if defined(MBEDTLS_ERROR_C)
144 if (exit_code != MBEDTLS_EXIT_SUCCESS) {
145 mbedtls_strerror(ret, (char *) buf, sizeof(buf));
146 mbedtls_printf(" ! Last error was: %s\n", buf);
147 }
148 #endif
149
150 mbedtls_exit(exit_code);
151 }
152 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
153 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
154 MBEDTLS_CTR_DRBG_C */
155
