1 /*
2 * Public key-based signature verification program
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 #include "mbedtls/build_info.h"
21
22 #include "mbedtls/platform.h"
23
24 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_MD_C) || \
25 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_PK_PARSE_C) || \
26 !defined(MBEDTLS_FS_IO)
main(void)27 int main( void )
28 {
29 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_MD_C and/or "
30 "MBEDTLS_SHA256_C and/or MBEDTLS_PK_PARSE_C and/or "
31 "MBEDTLS_FS_IO not defined.\n");
32 mbedtls_exit( 0 );
33 }
34 #else
35
36 #include "mbedtls/error.h"
37 #include "mbedtls/md.h"
38 #include "mbedtls/pk.h"
39
40 #include <stdio.h>
41 #include <string.h>
42
43
main(int argc,char * argv[])44 int main( int argc, char *argv[] )
45 {
46 FILE *f;
47 int ret = 1;
48 int exit_code = MBEDTLS_EXIT_FAILURE;
49 size_t i;
50 mbedtls_pk_context pk;
51 unsigned char hash[32];
52 unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
53 char filename[512];
54
55 mbedtls_pk_init( &pk );
56
57 if( argc != 3 )
58 {
59 mbedtls_printf( "usage: mbedtls_pk_verify <key_file> <filename>\n" );
60
61 #if defined(_WIN32)
62 mbedtls_printf( "\n" );
63 #endif
64
65 goto exit;
66 }
67
68 mbedtls_printf( "\n . Reading public key from '%s'", argv[1] );
69 fflush( stdout );
70
71 if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
72 {
73 mbedtls_printf( " failed\n ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", (unsigned int) -ret );
74 goto exit;
75 }
76
77 /*
78 * Extract the signature from the file
79 */
80 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
81
82 if( ( f = fopen( filename, "rb" ) ) == NULL )
83 {
84 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
85 goto exit;
86 }
87
88 i = fread( buf, 1, sizeof(buf), f );
89
90 fclose( f );
91
92 /*
93 * Compute the SHA-256 hash of the input file and
94 * verify the signature
95 */
96 mbedtls_printf( "\n . Verifying the SHA-256 signature" );
97 fflush( stdout );
98
99 if( ( ret = mbedtls_md_file(
100 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
101 argv[2], hash ) ) != 0 )
102 {
103 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
104 goto exit;
105 }
106
107 if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
108 buf, i ) ) != 0 )
109 {
110 mbedtls_printf( " failed\n ! mbedtls_pk_verify returned -0x%04x\n", (unsigned int) -ret );
111 goto exit;
112 }
113
114 mbedtls_printf( "\n . OK (the signature is valid)\n\n" );
115
116 exit_code = MBEDTLS_EXIT_SUCCESS;
117
118 exit:
119 mbedtls_pk_free( &pk );
120
121 #if defined(MBEDTLS_ERROR_C)
122 if( exit_code != MBEDTLS_EXIT_SUCCESS )
123 {
124 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
125 mbedtls_printf( " ! Last error was: %s\n", buf );
126 }
127 #endif
128
129 mbedtls_exit( exit_code );
130 }
131 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_SHA256_C &&
132 MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
133
