1 /*
2 * Public key-based 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_snprintf snprintf
59 #define mbedtls_printf printf
60 #define mbedtls_exit exit
61 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
62 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
63 #endif /* MBEDTLS_PLATFORM_C */
64
65 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
66 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
67 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
68 !defined(MBEDTLS_CTR_DRBG_C)
main(void)69 int main( void )
70 {
71 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
72 "MBEDTLS_SHA256_C and/or MBEDTLS_MD_C and/or "
73 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
74 "MBEDTLS_CTR_DRBG_C not defined.\n");
75 mbedtls_exit( 0 );
76 }
77 #else
78
79 #include "mbedtls/error.h"
80 #include "mbedtls/entropy.h"
81 #include "mbedtls/ctr_drbg.h"
82 #include "mbedtls/md.h"
83 #include "mbedtls/pk.h"
84
85 #include <stdio.h>
86 #include <string.h>
87
88
89 /*
90 * For the currently used signature algorithms the buffer to store any signature
91 * must be at least of size MAX(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)
92 */
93 #if MBEDTLS_ECDSA_MAX_LEN > MBEDTLS_MPI_MAX_SIZE
94 #define SIGNATURE_MAX_SIZE MBEDTLS_ECDSA_MAX_LEN
95 #else
96 #define SIGNATURE_MAX_SIZE MBEDTLS_MPI_MAX_SIZE
97 #endif
98
main(int argc,char * argv[])99 int main( int argc, char *argv[] )
100 {
101 FILE *f;
102 int ret = 1;
103 int exit_code = MBEDTLS_EXIT_FAILURE;
104 mbedtls_pk_context pk;
105 mbedtls_entropy_context entropy;
106 mbedtls_ctr_drbg_context ctr_drbg;
107 unsigned char hash[32];
108 unsigned char buf[SIGNATURE_MAX_SIZE];
109 char filename[512];
110 const char *pers = "mbedtls_pk_sign";
111 size_t olen = 0;
112
113 mbedtls_entropy_init( &entropy );
114 mbedtls_ctr_drbg_init( &ctr_drbg );
115 mbedtls_pk_init( &pk );
116
117 if( argc != 3 )
118 {
119 mbedtls_printf( "usage: mbedtls_pk_sign <key_file> <filename>\n" );
120
121 #if defined(_WIN32)
122 mbedtls_printf( "\n" );
123 #endif
124
125 goto exit;
126 }
127
128 mbedtls_printf( "\n . Seeding the random number generator..." );
129 fflush( stdout );
130
131 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
132 (const unsigned char *) pers,
133 strlen( pers ) ) ) != 0 )
134 {
135 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n", -ret );
136 goto exit;
137 }
138
139 mbedtls_printf( "\n . Reading private key from '%s'", argv[1] );
140 fflush( stdout );
141
142 if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
143 {
144 mbedtls_printf( " failed\n ! Could not parse '%s'\n", argv[1] );
145 goto exit;
146 }
147
148 /*
149 * Compute the SHA-256 hash of the input file,
150 * then calculate the signature of the hash.
151 */
152 mbedtls_printf( "\n . Generating the SHA-256 signature" );
153 fflush( stdout );
154
155 if( ( ret = mbedtls_md_file(
156 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
157 argv[2], hash ) ) != 0 )
158 {
159 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
160 goto exit;
161 }
162
163 if( ( ret = mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, 0, buf, &olen,
164 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
165 {
166 mbedtls_printf( " failed\n ! mbedtls_pk_sign returned -0x%04x\n", -ret );
167 goto exit;
168 }
169
170 /*
171 * Write the signature into <filename>.sig
172 */
173 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
174
175 if( ( f = fopen( filename, "wb+" ) ) == NULL )
176 {
177 mbedtls_printf( " failed\n ! Could not create %s\n\n", filename );
178 goto exit;
179 }
180
181 if( fwrite( buf, 1, olen, f ) != olen )
182 {
183 mbedtls_printf( "failed\n ! fwrite failed\n\n" );
184 fclose( f );
185 goto exit;
186 }
187
188 fclose( f );
189
190 mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename );
191
192 exit_code = MBEDTLS_EXIT_SUCCESS;
193
194 exit:
195 mbedtls_pk_free( &pk );
196 mbedtls_ctr_drbg_free( &ctr_drbg );
197 mbedtls_entropy_free( &entropy );
198
199 #if defined(MBEDTLS_ERROR_C)
200 if( exit_code != MBEDTLS_EXIT_SUCCESS )
201 {
202 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
203 mbedtls_printf( " ! Last error was: %s\n", buf );
204 }
205 #endif
206
207 #if defined(_WIN32)
208 mbedtls_printf( " + Press Enter to exit this program.\n" );
209 fflush( stdout ); getchar();
210 #endif
211
212 mbedtls_exit( exit_code );
213 }
214 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
215 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
216 MBEDTLS_CTR_DRBG_C */
217