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 #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_ENTROPY_C) || \
17 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_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_MD_C and/or MBEDTLS_ENTROPY_C and/or "
23 "MBEDTLS_RSA_C and/or MBEDTLS_SHA256_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/entropy.h"
31 #include "mbedtls/ctr_drbg.h"
32 #include "mbedtls/md.h"
33 #include "mbedtls/rsa.h"
34 #include "mbedtls/pk.h"
35
36 #include <stdio.h>
37 #include <string.h>
38
39
main(int argc,char * argv[])40 int main(int argc, char *argv[])
41 {
42 FILE *f;
43 int ret = 1;
44 int exit_code = MBEDTLS_EXIT_FAILURE;
45 mbedtls_pk_context pk;
46 mbedtls_entropy_context entropy;
47 mbedtls_ctr_drbg_context ctr_drbg;
48 unsigned char hash[32];
49 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
50 char filename[512];
51 const char *pers = "rsa_sign_pss";
52 size_t olen = 0;
53
54 mbedtls_entropy_init(&entropy);
55 mbedtls_pk_init(&pk);
56 mbedtls_ctr_drbg_init(&ctr_drbg);
57
58 #if defined(MBEDTLS_USE_PSA_CRYPTO)
59 psa_status_t status = psa_crypto_init();
60 if (status != PSA_SUCCESS) {
61 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
62 (int) status);
63 goto exit;
64 }
65 #endif /* MBEDTLS_USE_PSA_CRYPTO */
66
67 if (argc != 3) {
68 mbedtls_printf("usage: rsa_sign_pss <key_file> <filename>\n");
69
70 #if defined(_WIN32)
71 mbedtls_printf("\n");
72 #endif
73
74 goto exit;
75 }
76
77 mbedtls_printf("\n . Seeding the random number generator...");
78 fflush(stdout);
79
80 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
81 (const unsigned char *) pers,
82 strlen(pers))) != 0) {
83 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n", 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 read key from '%s'\n", argv[1]);
92 mbedtls_printf(" ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret);
93 goto exit;
94 }
95
96 if (!mbedtls_pk_can_do(&pk, MBEDTLS_PK_RSA)) {
97 mbedtls_printf(" failed\n ! Key is not an RSA key\n");
98 goto exit;
99 }
100
101 mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk), MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA256);
102
103 /*
104 * Compute the SHA-256 hash of the input file,
105 * then calculate the RSA signature of the hash.
106 */
107 mbedtls_printf("\n . Generating the RSA/SHA-256 signature");
108 fflush(stdout);
109
110 if ((ret = mbedtls_md_file(
111 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
112 argv[2], hash)) != 0) {
113 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
114 goto exit;
115 }
116
117 if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0, buf, &olen,
118 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
119 mbedtls_printf(" failed\n ! mbedtls_pk_sign returned %d\n\n", ret);
120 goto exit;
121 }
122
123 /*
124 * Write the signature into <filename>.sig
125 */
126 mbedtls_snprintf(filename, 512, "%s.sig", argv[2]);
127
128 if ((f = fopen(filename, "wb+")) == NULL) {
129 mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
130 goto exit;
131 }
132
133 if (fwrite(buf, 1, olen, f) != olen) {
134 mbedtls_printf("failed\n ! fwrite failed\n\n");
135 fclose(f);
136 goto exit;
137 }
138
139 fclose(f);
140
141 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
142
143 exit_code = MBEDTLS_EXIT_SUCCESS;
144
145 exit:
146 mbedtls_pk_free(&pk);
147 mbedtls_ctr_drbg_free(&ctr_drbg);
148 mbedtls_entropy_free(&entropy);
149 #if defined(MBEDTLS_USE_PSA_CRYPTO)
150 mbedtls_psa_crypto_free();
151 #endif /* MBEDTLS_USE_PSA_CRYPTO */
152
153 #if defined(_WIN32)
154 mbedtls_printf(" + Press Enter to exit this program.\n");
155 fflush(stdout); getchar();
156 #endif
157
158 mbedtls_exit(exit_code);
159 }
160 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
161 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
162 MBEDTLS_CTR_DRBG_C */
163