1 /*
2 * Public key-based signature verification program
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
24 #else
25 #include MBEDTLS_CONFIG_FILE
26 #endif
27
28 #if defined(MBEDTLS_PLATFORM_C)
29 #include "mbedtls/platform.h"
30 #else
31 #include <stdio.h>
32 #define mbedtls_snprintf snprintf
33 #define mbedtls_printf printf
34 #endif
35
36 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_MD_C) || \
37 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_PK_PARSE_C) || \
38 !defined(MBEDTLS_FS_IO)
main(void)39 int main( void )
40 {
41 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_MD_C and/or "
42 "MBEDTLS_SHA256_C and/or MBEDTLS_PK_PARSE_C and/or "
43 "MBEDTLS_FS_IO not defined.\n");
44 return( 0 );
45 }
46 #else
47
48 #include "mbedtls/error.h"
49 #include "mbedtls/md.h"
50 #include "mbedtls/pk.h"
51
52 #include <stdio.h>
53 #include <string.h>
54
main(int argc,char * argv[])55 int main( int argc, char *argv[] )
56 {
57 FILE *f;
58 int ret = 1;
59 size_t i;
60 mbedtls_pk_context pk;
61 unsigned char hash[32];
62 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
63 char filename[512];
64
65 mbedtls_pk_init( &pk );
66
67 if( argc != 3 )
68 {
69 mbedtls_printf( "usage: mbedtls_pk_verify <key_file> <filename>\n" );
70
71 #if defined(_WIN32)
72 mbedtls_printf( "\n" );
73 #endif
74
75 goto exit;
76 }
77
78 mbedtls_printf( "\n . Reading public key from '%s'", argv[1] );
79 fflush( stdout );
80
81 if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
82 {
83 mbedtls_printf( " failed\n ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", -ret );
84 goto exit;
85 }
86
87 /*
88 * Extract the signature from the file
89 */
90 ret = 1;
91 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
92
93 if( ( f = fopen( filename, "rb" ) ) == NULL )
94 {
95 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
96 goto exit;
97 }
98
99
100 i = fread( buf, 1, sizeof(buf), f );
101
102 fclose( f );
103
104 /*
105 * Compute the SHA-256 hash of the input file and
106 * verify the signature
107 */
108 mbedtls_printf( "\n . Verifying the SHA-256 signature" );
109 fflush( stdout );
110
111 if( ( ret = mbedtls_md_file(
112 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
113 argv[2], hash ) ) != 0 )
114 {
115 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
116 goto exit;
117 }
118
119 if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
120 buf, i ) ) != 0 )
121 {
122 mbedtls_printf( " failed\n ! mbedtls_pk_verify returned -0x%04x\n", -ret );
123 goto exit;
124 }
125
126 mbedtls_printf( "\n . OK (the signature is valid)\n\n" );
127
128 ret = 0;
129
130 exit:
131 mbedtls_pk_free( &pk );
132
133 #if defined(MBEDTLS_ERROR_C)
134 if( ret != 0 )
135 {
136 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
137 mbedtls_printf( " ! Last error was: %s\n", buf );
138 }
139 #endif
140
141 #if defined(_WIN32)
142 mbedtls_printf( " + Press Enter to exit this program.\n" );
143 fflush( stdout ); getchar();
144 #endif
145
146 return( ret );
147 }
148 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_SHA256_C &&
149 MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
150
