1 /*
2 * RSASSA-PSS/SHA-256 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_MD_C) || !defined(MBEDTLS_ENTROPY_C) || \
15 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_MD_CAN_SHA256) || \
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_MD_C and/or MBEDTLS_ENTROPY_C and/or "
21 "MBEDTLS_RSA_C and/or MBEDTLS_MD_CAN_SHA256 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/entropy.h"
29 #include "mbedtls/ctr_drbg.h"
30 #include "mbedtls/rsa.h"
31 #include "mbedtls/pk.h"
32
33 #include <stdio.h>
34 #include <string.h>
35
36
main(int argc,char * argv[])37 int main(int argc, char *argv[])
38 {
39 FILE *f;
40 int ret = 1;
41 int exit_code = MBEDTLS_EXIT_FAILURE;
42 mbedtls_pk_context pk;
43 mbedtls_entropy_context entropy;
44 mbedtls_ctr_drbg_context ctr_drbg;
45 unsigned char hash[32];
46 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
47 char filename[512];
48 const char *pers = "rsa_sign_pss";
49 size_t olen = 0;
50
51 mbedtls_entropy_init(&entropy);
52 mbedtls_pk_init(&pk);
53 mbedtls_ctr_drbg_init(&ctr_drbg);
54
55 #if defined(MBEDTLS_USE_PSA_CRYPTO)
56 psa_status_t status = psa_crypto_init();
57 if (status != PSA_SUCCESS) {
58 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
59 (int) status);
60 goto exit;
61 }
62 #endif /* MBEDTLS_USE_PSA_CRYPTO */
63
64 if (argc != 3) {
65 mbedtls_printf("usage: rsa_sign_pss <key_file> <filename>\n");
66
67 #if defined(_WIN32)
68 mbedtls_printf("\n");
69 #endif
70
71 goto exit;
72 }
73
74 mbedtls_printf("\n . Seeding the random number generator...");
75 fflush(stdout);
76
77 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
78 (const unsigned char *) pers,
79 strlen(pers))) != 0) {
80 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n", 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 read key from '%s'\n", argv[1]);
90 mbedtls_printf(" ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret);
91 goto exit;
92 }
93
94 if (!mbedtls_pk_can_do(&pk, MBEDTLS_PK_RSA)) {
95 mbedtls_printf(" failed\n ! Key is not an RSA key\n");
96 goto exit;
97 }
98
99 if ((ret = mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk),
100 MBEDTLS_RSA_PKCS_V21,
101 MBEDTLS_MD_SHA256)) != 0) {
102 mbedtls_printf(" failed\n ! Padding not supported\n");
103 goto exit;
104 }
105
106 /*
107 * Compute the SHA-256 hash of the input file,
108 * then calculate the RSA signature of the hash.
109 */
110 mbedtls_printf("\n . Generating the RSA/SHA-256 signature");
111 fflush(stdout);
112
113 if ((ret = mbedtls_md_file(
114 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
115 argv[2], hash)) != 0) {
116 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
117 goto exit;
118 }
119
120 if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
121 buf, sizeof(buf), &olen,
122 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
123 mbedtls_printf(" failed\n ! mbedtls_pk_sign returned %d\n\n", ret);
124 goto exit;
125 }
126
127 /*
128 * Write the signature into <filename>.sig
129 */
130 mbedtls_snprintf(filename, 512, "%s.sig", argv[2]);
131
132 if ((f = fopen(filename, "wb+")) == NULL) {
133 mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
134 goto exit;
135 }
136
137 if (fwrite(buf, 1, olen, f) != olen) {
138 mbedtls_printf("failed\n ! fwrite failed\n\n");
139 fclose(f);
140 goto exit;
141 }
142
143 fclose(f);
144
145 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
146
147 exit_code = MBEDTLS_EXIT_SUCCESS;
148
149 exit:
150 mbedtls_pk_free(&pk);
151 mbedtls_ctr_drbg_free(&ctr_drbg);
152 mbedtls_entropy_free(&entropy);
153 #if defined(MBEDTLS_USE_PSA_CRYPTO)
154 mbedtls_psa_crypto_free();
155 #endif /* MBEDTLS_USE_PSA_CRYPTO */
156
157 mbedtls_exit(exit_code);
158 }
159 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
160 MBEDTLS_MD_CAN_SHA256 && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
161 MBEDTLS_CTR_DRBG_C */
162
