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 #include "mbedtls/build_info.h"
9
10 #include "mbedtls/platform.h"
11 /* md.h is included this early since MD_CAN_XXX macros are defined there. */
12 #include "mbedtls/md.h"
13
14 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
15 !defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_MD_C) || \
16 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
17 !defined(MBEDTLS_CTR_DRBG_C)
main(void)18 int main(void)
19 {
20 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
21 "MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_MD_C and/or "
22 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
23 "MBEDTLS_CTR_DRBG_C not defined.\n");
24 mbedtls_exit(0);
25 }
26 #else
27
28 #include "mbedtls/error.h"
29 #include "mbedtls/entropy.h"
30 #include "mbedtls/ctr_drbg.h"
31 #include "mbedtls/pk.h"
32
33 #include <stdio.h>
34 #include <string.h>
35
main(int argc,char * argv[])36 int main(int argc, char *argv[])
37 {
38 FILE *f;
39 int ret = 1;
40 int exit_code = MBEDTLS_EXIT_FAILURE;
41 mbedtls_pk_context pk;
42 mbedtls_entropy_context entropy;
43 mbedtls_ctr_drbg_context ctr_drbg;
44 unsigned char hash[32];
45 unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
46 char filename[512];
47 const char *pers = "mbedtls_pk_sign";
48 size_t olen = 0;
49
50 mbedtls_entropy_init(&entropy);
51 mbedtls_ctr_drbg_init(&ctr_drbg);
52 mbedtls_pk_init(&pk);
53
54 #if defined(MBEDTLS_USE_PSA_CRYPTO)
55 psa_status_t status = psa_crypto_init();
56 if (status != PSA_SUCCESS) {
57 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
58 (int) status);
59 goto exit;
60 }
61 #endif /* MBEDTLS_USE_PSA_CRYPTO */
62
63 if (argc != 3) {
64 mbedtls_printf("usage: mbedtls_pk_sign <key_file> <filename>\n");
65
66 #if defined(_WIN32)
67 mbedtls_printf("\n");
68 #endif
69
70 goto exit;
71 }
72
73 mbedtls_printf("\n . Seeding the random number generator...");
74 fflush(stdout);
75
76 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
77 (const unsigned char *) pers,
78 strlen(pers))) != 0) {
79 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
80 (unsigned int) -ret);
81 goto exit;
82 }
83
84 mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
85 fflush(stdout);
86
87 if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
88 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
89 mbedtls_printf(" failed\n ! Could not parse '%s'\n", argv[1]);
90 goto exit;
91 }
92
93 /*
94 * Compute the SHA-256 hash of the input file,
95 * then calculate the signature of the hash.
96 */
97 mbedtls_printf("\n . Generating the SHA-256 signature");
98 fflush(stdout);
99
100 if ((ret = mbedtls_md_file(
101 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
102 argv[2], hash)) != 0) {
103 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
104 goto exit;
105 }
106
107 if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
108 buf, sizeof(buf), &olen,
109 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
110 mbedtls_printf(" failed\n ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret);
111 goto exit;
112 }
113
114 /*
115 * Write the signature into <filename>.sig
116 */
117 mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[2]);
118
119 if ((f = fopen(filename, "wb+")) == NULL) {
120 mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
121 goto exit;
122 }
123
124 if (fwrite(buf, 1, olen, f) != olen) {
125 mbedtls_printf("failed\n ! fwrite failed\n\n");
126 fclose(f);
127 goto exit;
128 }
129
130 fclose(f);
131
132 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
133
134 exit_code = MBEDTLS_EXIT_SUCCESS;
135
136 exit:
137 mbedtls_pk_free(&pk);
138 mbedtls_ctr_drbg_free(&ctr_drbg);
139 mbedtls_entropy_free(&entropy);
140 #if defined(MBEDTLS_USE_PSA_CRYPTO)
141 mbedtls_psa_crypto_free();
142 #endif /* MBEDTLS_USE_PSA_CRYPTO */
143
144 #if defined(MBEDTLS_ERROR_C)
145 if (exit_code != MBEDTLS_EXIT_SUCCESS) {
146 mbedtls_strerror(ret, (char *) buf, sizeof(buf));
147 mbedtls_printf(" ! Last error was: %s\n", buf);
148 }
149 #endif
150
151 mbedtls_exit(exit_code);
152 }
153 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
154 MBEDTLS_MD_CAN_SHA256 && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
155 MBEDTLS_CTR_DRBG_C */
156