1 /*
2 * Public key-based signature verification 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_MD_C) || \
66 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_PK_PARSE_C) || \
67 !defined(MBEDTLS_FS_IO)
main(void)68 int main( void )
69 {
70 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_MD_C and/or "
71 "MBEDTLS_SHA256_C and/or MBEDTLS_PK_PARSE_C and/or "
72 "MBEDTLS_FS_IO not defined.\n");
73 mbedtls_exit( 0 );
74 }
75 #else
76
77 #include "mbedtls/error.h"
78 #include "mbedtls/md.h"
79 #include "mbedtls/pk.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_pk_context pk;
92 unsigned char hash[32];
93 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
94 char filename[512];
95
96 mbedtls_pk_init( &pk );
97
98 if( argc != 3 )
99 {
100 mbedtls_printf( "usage: mbedtls_pk_verify <key_file> <filename>\n" );
101
102 #if defined(_WIN32)
103 mbedtls_printf( "\n" );
104 #endif
105
106 goto exit;
107 }
108
109 mbedtls_printf( "\n . Reading public key from '%s'", argv[1] );
110 fflush( stdout );
111
112 if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
113 {
114 mbedtls_printf( " failed\n ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", -ret );
115 goto exit;
116 }
117
118 /*
119 * Extract the signature from the file
120 */
121 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
122
123 if( ( f = fopen( filename, "rb" ) ) == NULL )
124 {
125 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
126 goto exit;
127 }
128
129 i = fread( buf, 1, sizeof(buf), f );
130
131 fclose( f );
132
133 /*
134 * Compute the SHA-256 hash of the input file and
135 * verify the signature
136 */
137 mbedtls_printf( "\n . Verifying the SHA-256 signature" );
138 fflush( stdout );
139
140 if( ( ret = mbedtls_md_file(
141 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
142 argv[2], hash ) ) != 0 )
143 {
144 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
145 goto exit;
146 }
147
148 if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
149 buf, i ) ) != 0 )
150 {
151 mbedtls_printf( " failed\n ! mbedtls_pk_verify returned -0x%04x\n", -ret );
152 goto exit;
153 }
154
155 mbedtls_printf( "\n . OK (the signature is valid)\n\n" );
156
157 exit_code = MBEDTLS_EXIT_SUCCESS;
158
159 exit:
160 mbedtls_pk_free( &pk );
161
162 #if defined(MBEDTLS_ERROR_C)
163 if( exit_code != MBEDTLS_EXIT_SUCCESS )
164 {
165 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
166 mbedtls_printf( " ! Last error was: %s\n", buf );
167 }
168 #endif
169
170 #if defined(_WIN32)
171 mbedtls_printf( " + Press Enter to exit this program.\n" );
172 fflush( stdout ); getchar();
173 #endif
174
175 mbedtls_exit( exit_code );
176 }
177 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_SHA256_C &&
178 MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
179