1 /*
2 * RSA/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_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
17 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
18 !defined(MBEDTLS_FS_IO)
main(void)19 int main(void)
20 {
21 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
22 "MBEDTLS_MD_C and/or "
23 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
24 mbedtls_exit(0);
25 }
26 #else
27
28 #include "mbedtls/rsa.h"
29 #include "mbedtls/md.h"
30
31 #include <stdio.h>
32 #include <string.h>
33
34
main(int argc,char * argv[])35 int main(int argc, char *argv[])
36 {
37 FILE *f;
38 int ret = 1;
39 int exit_code = MBEDTLS_EXIT_FAILURE;
40 size_t i;
41 mbedtls_rsa_context rsa;
42 unsigned char hash[32];
43 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
44 char filename[512];
45 mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
46
47 mbedtls_rsa_init(&rsa, MBEDTLS_RSA_PKCS_V15, 0);
48
49 mbedtls_mpi_init(&N); mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
50 mbedtls_mpi_init(&D); mbedtls_mpi_init(&E); mbedtls_mpi_init(&DP);
51 mbedtls_mpi_init(&DQ); mbedtls_mpi_init(&QP);
52
53 if (argc != 2) {
54 mbedtls_printf("usage: rsa_sign <filename>\n");
55
56 #if defined(_WIN32)
57 mbedtls_printf("\n");
58 #endif
59
60 goto exit;
61 }
62
63 mbedtls_printf("\n . Reading private key from rsa_priv.txt");
64 fflush(stdout);
65
66 if ((f = fopen("rsa_priv.txt", "rb")) == NULL) {
67 mbedtls_printf(" failed\n ! Could not open rsa_priv.txt\n" \
68 " ! Please run rsa_genkey first\n\n");
69 goto exit;
70 }
71
72 if ((ret = mbedtls_mpi_read_file(&N, 16, f)) != 0 ||
73 (ret = mbedtls_mpi_read_file(&E, 16, f)) != 0 ||
74 (ret = mbedtls_mpi_read_file(&D, 16, f)) != 0 ||
75 (ret = mbedtls_mpi_read_file(&P, 16, f)) != 0 ||
76 (ret = mbedtls_mpi_read_file(&Q, 16, f)) != 0 ||
77 (ret = mbedtls_mpi_read_file(&DP, 16, f)) != 0 ||
78 (ret = mbedtls_mpi_read_file(&DQ, 16, f)) != 0 ||
79 (ret = mbedtls_mpi_read_file(&QP, 16, f)) != 0) {
80 mbedtls_printf(" failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret);
81 fclose(f);
82 goto exit;
83 }
84 fclose(f);
85
86 if ((ret = mbedtls_rsa_import(&rsa, &N, &P, &Q, &D, &E)) != 0) {
87 mbedtls_printf(" failed\n ! mbedtls_rsa_import returned %d\n\n",
88 ret);
89 goto exit;
90 }
91
92 if ((ret = mbedtls_rsa_complete(&rsa)) != 0) {
93 mbedtls_printf(" failed\n ! mbedtls_rsa_complete returned %d\n\n",
94 ret);
95 goto exit;
96 }
97
98 mbedtls_printf("\n . Checking the private key");
99 fflush(stdout);
100 if ((ret = mbedtls_rsa_check_privkey(&rsa)) != 0) {
101 mbedtls_printf(" failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n",
102 (unsigned int) -ret);
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[1], hash)) != 0) {
116 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[1]);
117 goto exit;
118 }
119
120 if ((ret = mbedtls_rsa_pkcs1_sign(&rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
121 20, hash, buf)) != 0) {
122 mbedtls_printf(" failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n",
123 (unsigned int) -ret);
124 goto exit;
125 }
126
127 /*
128 * Write the signature into <filename>.sig
129 */
130 mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[1]);
131
132 if ((f = fopen(filename, "wb+")) == NULL) {
133 mbedtls_printf(" failed\n ! Could not create %s\n\n", argv[1]);
134 goto exit;
135 }
136
137 for (i = 0; i < rsa.len; i++) {
138 mbedtls_fprintf(f, "%02X%s", buf[i],
139 (i + 1) % 16 == 0 ? "\r\n" : " ");
140 }
141
142 fclose(f);
143
144 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
145
146 exit_code = MBEDTLS_EXIT_SUCCESS;
147
148 exit:
149
150 mbedtls_rsa_free(&rsa);
151 mbedtls_mpi_free(&N); mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
152 mbedtls_mpi_free(&D); mbedtls_mpi_free(&E); mbedtls_mpi_free(&DP);
153 mbedtls_mpi_free(&DQ); mbedtls_mpi_free(&QP);
154
155 #if defined(_WIN32)
156 mbedtls_printf(" + Press Enter to exit this program.\n");
157 fflush(stdout); getchar();
158 #endif
159
160 mbedtls_exit(exit_code);
161 }
162 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
163 MBEDTLS_FS_IO */
164