1 /*
2 * RSASSA-PSS/SHA-256 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_MD_C) || !defined(MBEDTLS_ENTROPY_C) || \
66 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_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_MD_C and/or MBEDTLS_ENTROPY_C and/or "
72 "MBEDTLS_RSA_C and/or MBEDTLS_SHA256_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/md.h"
80 #include "mbedtls/pem.h"
81 #include "mbedtls/pk.h"
82 #include "mbedtls/md.h"
83 #include "mbedtls/x509.h"
84
85 #include <stdio.h>
86 #include <string.h>
87
88
main(int argc,char * argv[])89 int main( int argc, char *argv[] )
90 {
91 FILE *f;
92 int ret = 1;
93 int exit_code = MBEDTLS_EXIT_FAILURE;
94 size_t i;
95 mbedtls_pk_context pk;
96 unsigned char hash[32];
97 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
98 char filename[512];
99
100 mbedtls_pk_init( &pk );
101
102 if( argc != 3 )
103 {
104 mbedtls_printf( "usage: rsa_verify_pss <key_file> <filename>\n" );
105
106 #if defined(_WIN32)
107 mbedtls_printf( "\n" );
108 #endif
109
110 goto exit;
111 }
112
113 mbedtls_printf( "\n . Reading public key from '%s'", argv[1] );
114 fflush( stdout );
115
116 if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
117 {
118 mbedtls_printf( " failed\n ! Could not read key from '%s'\n", argv[1] );
119 mbedtls_printf( " ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret );
120 goto exit;
121 }
122
123 if( !mbedtls_pk_can_do( &pk, MBEDTLS_PK_RSA ) )
124 {
125 mbedtls_printf( " failed\n ! Key is not an RSA key\n" );
126 goto exit;
127 }
128
129 mbedtls_rsa_set_padding( mbedtls_pk_rsa( pk ), MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA256 );
130
131 /*
132 * Extract the RSA signature from the file
133 */
134 mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
135
136 if( ( f = fopen( filename, "rb" ) ) == NULL )
137 {
138 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
139 goto exit;
140 }
141
142 i = fread( buf, 1, MBEDTLS_MPI_MAX_SIZE, f );
143
144 fclose( f );
145
146 /*
147 * Compute the SHA-256 hash of the input file and
148 * verify the signature
149 */
150 mbedtls_printf( "\n . Verifying the RSA/SHA-256 signature" );
151 fflush( stdout );
152
153 if( ( ret = mbedtls_md_file(
154 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
155 argv[2], hash ) ) != 0 )
156 {
157 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
158 goto exit;
159 }
160
161 if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
162 buf, i ) ) != 0 )
163 {
164 mbedtls_printf( " failed\n ! mbedtls_pk_verify returned %d\n\n", ret );
165 goto exit;
166 }
167
168 mbedtls_printf( "\n . OK (the signature is valid)\n\n" );
169
170 exit_code = MBEDTLS_EXIT_SUCCESS;
171
172 exit:
173 mbedtls_pk_free( &pk );
174
175 #if defined(_WIN32)
176 mbedtls_printf( " + Press Enter to exit this program.\n" );
177 fflush( stdout ); getchar();
178 #endif
179
180 mbedtls_exit( exit_code );
181 }
182 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
183 MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
184