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 * This file is provided under the Apache License 2.0, or the
8 * GNU General Public License v2.0 or later.
9 *
10 * **********
11 * Apache License 2.0:
12 *
13 * Licensed under the Apache License, Version 2.0 (the "License"); you may
14 * not use this file except in compliance with the License.
15 * You may obtain a copy of the License at
16 *
17 * http://www.apache.org/licenses/LICENSE-2.0
18 *
19 * Unless required by applicable law or agreed to in writing, software
20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 * See the License for the specific language governing permissions and
23 * limitations under the License.
24 *
25 * **********
26 *
27 * **********
28 * GNU General Public License v2.0 or later:
29 *
30 * This program is free software; you can redistribute it and/or modify
31 * it under the terms of the GNU General Public License as published by
32 * the Free Software Foundation; either version 2 of the License, or
33 * (at your option) any later version.
34 *
35 * This program is distributed in the hope that it will be useful,
36 * but WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 * GNU General Public License for more details.
39 *
40 * You should have received a copy of the GNU General Public License along
41 * with this program; if not, write to the Free Software Foundation, Inc.,
42 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
43 *
44 * **********
45 */
46
47 #if !defined(MBEDTLS_CONFIG_FILE)
48 #include "mbedtls/config.h"
49 #else
50 #include MBEDTLS_CONFIG_FILE
51 #endif
52
53 #if defined(MBEDTLS_PLATFORM_C)
54 #include "mbedtls/platform.h"
55 #else
56 #include <stdio.h>
57 #include <stdlib.h>
58 #define mbedtls_fprintf fprintf
59 #define mbedtls_printf printf
60 #define mbedtls_snprintf snprintf
61 #define mbedtls_exit exit
62 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
63 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
64 #endif /* MBEDTLS_PLATFORM_C */
65
66 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
67 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
68 !defined(MBEDTLS_FS_IO)
main(void)69 int main( void )
70 {
71 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
72 "MBEDTLS_MD_C and/or "
73 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
74 mbedtls_exit( 0 );
75 }
76 #else
77
78 #include "mbedtls/rsa.h"
79 #include "mbedtls/md.h"
80
81 #include <stdio.h>
82 #include <string.h>
83
84
main(int argc,char * argv[])85 int main( int argc, char *argv[] )
86 {
87 FILE *f;
88 int ret = 1;
89 int exit_code = MBEDTLS_EXIT_FAILURE;
90 size_t i;
91 mbedtls_rsa_context rsa;
92 unsigned char hash[32];
93 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
94 char filename[512];
95 mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
96
97 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
98
99 mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
100 mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
101 mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
102
103 if( argc != 2 )
104 {
105 mbedtls_printf( "usage: rsa_sign <filename>\n" );
106
107 #if defined(_WIN32)
108 mbedtls_printf( "\n" );
109 #endif
110
111 goto exit;
112 }
113
114 mbedtls_printf( "\n . Reading private key from rsa_priv.txt" );
115 fflush( stdout );
116
117 if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
118 {
119 mbedtls_printf( " failed\n ! Could not open rsa_priv.txt\n" \
120 " ! Please run rsa_genkey first\n\n" );
121 goto exit;
122 }
123
124 if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
125 ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
126 ( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
127 ( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
128 ( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 ||
129 ( ret = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 ||
130 ( ret = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 ||
131 ( ret = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 )
132 {
133 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret );
134 fclose( f );
135 goto exit;
136 }
137 fclose( f );
138
139 if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
140 {
141 mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n",
142 ret );
143 goto exit;
144 }
145
146 if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
147 {
148 mbedtls_printf( " failed\n ! mbedtls_rsa_complete returned %d\n\n",
149 ret );
150 goto exit;
151 }
152
153 mbedtls_printf( "\n . Checking the private key" );
154 fflush( stdout );
155 if( ( ret = mbedtls_rsa_check_privkey( &rsa ) ) != 0 )
156 {
157 mbedtls_printf( " failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n", -ret );
158 goto exit;
159 }
160
161 /*
162 * Compute the SHA-256 hash of the input file,
163 * then calculate the RSA signature of the hash.
164 */
165 mbedtls_printf( "\n . Generating the RSA/SHA-256 signature" );
166 fflush( stdout );
167
168 if( ( ret = mbedtls_md_file(
169 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
170 argv[1], hash ) ) != 0 )
171 {
172 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[1] );
173 goto exit;
174 }
175
176 if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
177 20, hash, buf ) ) != 0 )
178 {
179 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n", -ret );
180 goto exit;
181 }
182
183 /*
184 * Write the signature into <filename>.sig
185 */
186 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
187
188 if( ( f = fopen( filename, "wb+" ) ) == NULL )
189 {
190 mbedtls_printf( " failed\n ! Could not create %s\n\n", argv[1] );
191 goto exit;
192 }
193
194 for( i = 0; i < rsa.len; i++ )
195 mbedtls_fprintf( f, "%02X%s", buf[i],
196 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
197
198 fclose( f );
199
200 mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename );
201
202 exit_code = MBEDTLS_EXIT_SUCCESS;
203
204 exit:
205
206 mbedtls_rsa_free( &rsa );
207 mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
208 mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
209 mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
210
211 #if defined(_WIN32)
212 mbedtls_printf( " + Press Enter to exit this program.\n" );
213 fflush( stdout ); getchar();
214 #endif
215
216 mbedtls_exit( exit_code );
217 }
218 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
219 MBEDTLS_FS_IO */
220