1 /*
2 * RSA/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_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
25 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
26 !defined(MBEDTLS_FS_IO)
main(void)27 int main(void)
28 {
29 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
30 "MBEDTLS_MD_C and/or "
31 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
32 mbedtls_exit(0);
33 }
34 #else
35
36 #include "mbedtls/rsa.h"
37 #include "mbedtls/md.h"
38
39 #include <stdio.h>
40 #include <string.h>
41
42
main(int argc,char * argv[])43 int main(int argc, char *argv[])
44 {
45 FILE *f;
46 int ret = 1;
47 int exit_code = MBEDTLS_EXIT_FAILURE;
48 size_t i;
49 mbedtls_rsa_context rsa;
50 unsigned char hash[32];
51 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
52 char filename[512];
53 mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
54
55 mbedtls_rsa_init(&rsa);
56
57 mbedtls_mpi_init(&N); mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
58 mbedtls_mpi_init(&D); mbedtls_mpi_init(&E); mbedtls_mpi_init(&DP);
59 mbedtls_mpi_init(&DQ); mbedtls_mpi_init(&QP);
60
61 if (argc != 2) {
62 mbedtls_printf("usage: rsa_sign <filename>\n");
63
64 #if defined(_WIN32)
65 mbedtls_printf("\n");
66 #endif
67
68 goto exit;
69 }
70
71 mbedtls_printf("\n . Reading private key from rsa_priv.txt");
72 fflush(stdout);
73
74 if ((f = fopen("rsa_priv.txt", "rb")) == NULL) {
75 mbedtls_printf(" failed\n ! Could not open rsa_priv.txt\n" \
76 " ! Please run rsa_genkey first\n\n");
77 goto exit;
78 }
79
80 if ((ret = mbedtls_mpi_read_file(&N, 16, f)) != 0 ||
81 (ret = mbedtls_mpi_read_file(&E, 16, f)) != 0 ||
82 (ret = mbedtls_mpi_read_file(&D, 16, f)) != 0 ||
83 (ret = mbedtls_mpi_read_file(&P, 16, f)) != 0 ||
84 (ret = mbedtls_mpi_read_file(&Q, 16, f)) != 0 ||
85 (ret = mbedtls_mpi_read_file(&DP, 16, f)) != 0 ||
86 (ret = mbedtls_mpi_read_file(&DQ, 16, f)) != 0 ||
87 (ret = mbedtls_mpi_read_file(&QP, 16, f)) != 0) {
88 mbedtls_printf(" failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret);
89 fclose(f);
90 goto exit;
91 }
92 fclose(f);
93
94 if ((ret = mbedtls_rsa_import(&rsa, &N, &P, &Q, &D, &E)) != 0) {
95 mbedtls_printf(" failed\n ! mbedtls_rsa_import returned %d\n\n",
96 ret);
97 goto exit;
98 }
99
100 if ((ret = mbedtls_rsa_complete(&rsa)) != 0) {
101 mbedtls_printf(" failed\n ! mbedtls_rsa_complete returned %d\n\n",
102 ret);
103 goto exit;
104 }
105
106 mbedtls_printf("\n . Checking the private key");
107 fflush(stdout);
108 if ((ret = mbedtls_rsa_check_privkey(&rsa)) != 0) {
109 mbedtls_printf(" failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n",
110 (unsigned int) -ret);
111 goto exit;
112 }
113
114 /*
115 * Compute the SHA-256 hash of the input file,
116 * then calculate the RSA signature of the hash.
117 */
118 mbedtls_printf("\n . Generating the RSA/SHA-256 signature");
119 fflush(stdout);
120
121 if ((ret = mbedtls_md_file(
122 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
123 argv[1], hash)) != 0) {
124 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[1]);
125 goto exit;
126 }
127
128 if ((ret = mbedtls_rsa_pkcs1_sign(&rsa, NULL, NULL, MBEDTLS_MD_SHA256,
129 32, hash, buf)) != 0) {
130 mbedtls_printf(" failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n",
131 (unsigned int) -ret);
132 goto exit;
133 }
134
135 /*
136 * Write the signature into <filename>.sig
137 */
138 mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[1]);
139
140 if ((f = fopen(filename, "wb+")) == NULL) {
141 mbedtls_printf(" failed\n ! Could not create %s\n\n", argv[1]);
142 goto exit;
143 }
144
145 for (i = 0; i < rsa.MBEDTLS_PRIVATE(len); i++) {
146 mbedtls_fprintf(f, "%02X%s", buf[i],
147 (i + 1) % 16 == 0 ? "\r\n" : " ");
148 }
149
150 fclose(f);
151
152 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
153
154 exit_code = MBEDTLS_EXIT_SUCCESS;
155
156 exit:
157
158 mbedtls_rsa_free(&rsa);
159 mbedtls_mpi_free(&N); mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
160 mbedtls_mpi_free(&D); mbedtls_mpi_free(&E); mbedtls_mpi_free(&DP);
161 mbedtls_mpi_free(&DQ); mbedtls_mpi_free(&QP);
162
163 mbedtls_exit(exit_code);
164 }
165 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
166 MBEDTLS_FS_IO */
167
