1 /*
2 * RSASSA-PSS/SHA-256 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_MD_C) || !defined(MBEDTLS_ENTROPY_C) || \
25 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_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_MD_C and/or MBEDTLS_ENTROPY_C and/or "
31 "MBEDTLS_RSA_C and/or MBEDTLS_SHA256_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/entropy.h"
39 #include "mbedtls/ctr_drbg.h"
40 #include "mbedtls/md.h"
41 #include "mbedtls/rsa.h"
42 #include "mbedtls/pk.h"
43
44 #include <stdio.h>
45 #include <string.h>
46
47
main(int argc,char * argv[])48 int main(int argc, char *argv[])
49 {
50 FILE *f;
51 int ret = 1;
52 int exit_code = MBEDTLS_EXIT_FAILURE;
53 mbedtls_pk_context pk;
54 mbedtls_entropy_context entropy;
55 mbedtls_ctr_drbg_context ctr_drbg;
56 unsigned char hash[32];
57 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
58 char filename[512];
59 const char *pers = "rsa_sign_pss";
60 size_t olen = 0;
61
62 mbedtls_entropy_init(&entropy);
63 mbedtls_pk_init(&pk);
64 mbedtls_ctr_drbg_init(&ctr_drbg);
65
66 if (argc != 3) {
67 mbedtls_printf("usage: rsa_sign_pss <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 %d\n", 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 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 if ((ret = mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk),
102 MBEDTLS_RSA_PKCS_V21,
103 MBEDTLS_MD_SHA256)) != 0) {
104 mbedtls_printf(" failed\n ! Padding not supported\n");
105 goto exit;
106 }
107
108 /*
109 * Compute the SHA-256 hash of the input file,
110 * then calculate the RSA signature of the hash.
111 */
112 mbedtls_printf("\n . Generating the RSA/SHA-256 signature");
113 fflush(stdout);
114
115 if ((ret = mbedtls_md_file(
116 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
117 argv[2], hash)) != 0) {
118 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
119 goto exit;
120 }
121
122 if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
123 buf, sizeof(buf), &olen,
124 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
125 mbedtls_printf(" failed\n ! mbedtls_pk_sign returned %d\n\n", ret);
126 goto exit;
127 }
128
129 /*
130 * Write the signature into <filename>.sig
131 */
132 mbedtls_snprintf(filename, 512, "%s.sig", argv[2]);
133
134 if ((f = fopen(filename, "wb+")) == NULL) {
135 mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
136 goto exit;
137 }
138
139 if (fwrite(buf, 1, olen, f) != olen) {
140 mbedtls_printf("failed\n ! fwrite failed\n\n");
141 fclose(f);
142 goto exit;
143 }
144
145 fclose(f);
146
147 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
148
149 exit_code = MBEDTLS_EXIT_SUCCESS;
150
151 exit:
152 mbedtls_pk_free(&pk);
153 mbedtls_ctr_drbg_free(&ctr_drbg);
154 mbedtls_entropy_free(&entropy);
155
156 mbedtls_exit(exit_code);
157 }
158 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
159 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
160 MBEDTLS_CTR_DRBG_C */
161