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 #include <stdlib.h>
33 #define mbedtls_snprintf snprintf
34 #define mbedtls_printf printf
35 #define mbedtls_exit exit
36 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
37 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
38 #endif /* MBEDTLS_PLATFORM_C */
39
40 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_MD_C) || \
41 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_PK_PARSE_C) || \
42 !defined(MBEDTLS_FS_IO)
main(void)43 int main( void )
44 {
45 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_MD_C and/or "
46 "MBEDTLS_SHA256_C and/or MBEDTLS_PK_PARSE_C and/or "
47 "MBEDTLS_FS_IO not defined.\n");
48 return( 0 );
49 }
50 #else
51
52 #include "mbedtls/error.h"
53 #include "mbedtls/md.h"
54 #include "mbedtls/pk.h"
55
56 #include <stdio.h>
57 #include <string.h>
58
59 #if defined(MBEDTLS_CHECK_PARAMS)
60 #include "mbedtls/platform_util.h"
mbedtls_param_failed(const char * failure_condition,const char * file,int line)61 void mbedtls_param_failed( const char *failure_condition,
62 const char *file,
63 int line )
64 {
65 mbedtls_printf( "%s:%i: Input param failed - %s\n",
66 file, line, failure_condition );
67 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
68 }
69 #endif
70
main(int argc,char * argv[])71 int main( int argc, char *argv[] )
72 {
73 FILE *f;
74 int ret = 1;
75 int exit_code = MBEDTLS_EXIT_FAILURE;
76 size_t i;
77 mbedtls_pk_context pk;
78 unsigned char hash[32];
79 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
80 char filename[512];
81
82 mbedtls_pk_init( &pk );
83
84 if( argc != 3 )
85 {
86 mbedtls_printf( "usage: mbedtls_pk_verify <key_file> <filename>\n" );
87
88 #if defined(_WIN32)
89 mbedtls_printf( "\n" );
90 #endif
91
92 goto exit;
93 }
94
95 mbedtls_printf( "\n . Reading public key from '%s'", argv[1] );
96 fflush( stdout );
97
98 if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
99 {
100 mbedtls_printf( " failed\n ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", -ret );
101 goto exit;
102 }
103
104 /*
105 * Extract the signature from the file
106 */
107 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
108
109 if( ( f = fopen( filename, "rb" ) ) == NULL )
110 {
111 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
112 goto exit;
113 }
114
115
116 i = fread( buf, 1, sizeof(buf), f );
117
118 fclose( f );
119
120 /*
121 * Compute the SHA-256 hash of the input file and
122 * verify the signature
123 */
124 mbedtls_printf( "\n . Verifying the SHA-256 signature" );
125 fflush( stdout );
126
127 if( ( ret = mbedtls_md_file(
128 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
129 argv[2], hash ) ) != 0 )
130 {
131 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
132 goto exit;
133 }
134
135 if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
136 buf, i ) ) != 0 )
137 {
138 mbedtls_printf( " failed\n ! mbedtls_pk_verify returned -0x%04x\n", -ret );
139 goto exit;
140 }
141
142 mbedtls_printf( "\n . OK (the signature is valid)\n\n" );
143
144 exit_code = MBEDTLS_EXIT_SUCCESS;
145
146 exit:
147 mbedtls_pk_free( &pk );
148
149 #if defined(MBEDTLS_ERROR_C)
150 if( exit_code != MBEDTLS_EXIT_SUCCESS )
151 {
152 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
153 mbedtls_printf( " ! Last error was: %s\n", buf );
154 }
155 #endif
156
157 #if defined(_WIN32)
158 mbedtls_printf( " + Press Enter to exit this program.\n" );
159 fflush( stdout ); getchar();
160 #endif
161
162 return( exit_code );
163 }
164 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_SHA256_C &&
165 MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
166