1 /*
2 * Public key-based signature creation 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_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
17 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
18 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
19 !defined(MBEDTLS_CTR_DRBG_C)
main(void)20 int main(void)
21 {
22 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
23 "MBEDTLS_SHA256_C and/or MBEDTLS_MD_C and/or "
24 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
25 "MBEDTLS_CTR_DRBG_C not defined.\n");
26 mbedtls_exit(0);
27 }
28 #else
29
30 #include "mbedtls/error.h"
31 #include "mbedtls/entropy.h"
32 #include "mbedtls/ctr_drbg.h"
33 #include "mbedtls/md.h"
34 #include "mbedtls/pk.h"
35
36 #include <stdio.h>
37 #include <string.h>
38
main(int argc,char * argv[])39 int main(int argc, char *argv[])
40 {
41 FILE *f;
42 int ret = 1;
43 int exit_code = MBEDTLS_EXIT_FAILURE;
44 mbedtls_pk_context pk;
45 mbedtls_entropy_context entropy;
46 mbedtls_ctr_drbg_context ctr_drbg;
47 unsigned char hash[32];
48 unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
49 char filename[512];
50 const char *pers = "mbedtls_pk_sign";
51 size_t olen = 0;
52
53 mbedtls_entropy_init(&entropy);
54 mbedtls_ctr_drbg_init(&ctr_drbg);
55 mbedtls_pk_init(&pk);
56
57 #if defined(MBEDTLS_USE_PSA_CRYPTO)
58 psa_status_t status = psa_crypto_init();
59 if (status != PSA_SUCCESS) {
60 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
61 (int) status);
62 goto exit;
63 }
64 #endif /* MBEDTLS_USE_PSA_CRYPTO */
65
66 if (argc != 3) {
67 mbedtls_printf("usage: mbedtls_pk_sign <key_file> <filename>\n");
68
69 #if defined(_WIN32)
70 mbedtls_printf("\n");
71 #endif
72
73 goto exit;
74 }
75
76 mbedtls_printf("\n . Seeding the random number generator...");
77 fflush(stdout);
78
79 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
80 (const unsigned char *) pers,
81 strlen(pers))) != 0) {
82 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
83 (unsigned int) -ret);
84 goto exit;
85 }
86
87 mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
88 fflush(stdout);
89
90 if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "")) != 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, buf, &olen,
110 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
111 mbedtls_printf(" failed\n ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret);
112 goto exit;
113 }
114
115 /*
116 * Write the signature into <filename>.sig
117 */
118 mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[2]);
119
120 if ((f = fopen(filename, "wb+")) == NULL) {
121 mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
122 goto exit;
123 }
124
125 if (fwrite(buf, 1, olen, f) != olen) {
126 mbedtls_printf("failed\n ! fwrite failed\n\n");
127 fclose(f);
128 goto exit;
129 }
130
131 fclose(f);
132
133 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
134
135 exit_code = MBEDTLS_EXIT_SUCCESS;
136
137 exit:
138 mbedtls_pk_free(&pk);
139 mbedtls_ctr_drbg_free(&ctr_drbg);
140 mbedtls_entropy_free(&entropy);
141 #if defined(MBEDTLS_USE_PSA_CRYPTO)
142 mbedtls_psa_crypto_free();
143 #endif /* MBEDTLS_USE_PSA_CRYPTO */
144
145 #if defined(MBEDTLS_ERROR_C)
146 if (exit_code != MBEDTLS_EXIT_SUCCESS) {
147 mbedtls_strerror(ret, (char *) buf, sizeof(buf));
148 mbedtls_printf(" ! Last error was: %s\n", buf);
149 }
150 #endif
151
152 #if defined(_WIN32)
153 mbedtls_printf(" + Press Enter to exit this program.\n");
154 fflush(stdout); getchar();
155 #endif
156
157 mbedtls_exit(exit_code);
158 }
159 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
160 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
161 MBEDTLS_CTR_DRBG_C */
162