1 /*
2 * RSASSA-PSS/SHA-256 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 #if defined(MBEDTLS_PLATFORM_C)
23 #include "mbedtls/platform.h"
24 #else
25 #include <stdio.h>
26 #include <stdlib.h>
27 #define mbedtls_snprintf snprintf
28 #define mbedtls_printf printf
29 #define mbedtls_exit exit
30 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
31 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
32 #endif /* MBEDTLS_PLATFORM_C */
33
34 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_ENTROPY_C) || \
35 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) || \
36 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
37 !defined(MBEDTLS_CTR_DRBG_C)
main(void)38 int main( void )
39 {
40 mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_ENTROPY_C and/or "
41 "MBEDTLS_RSA_C and/or MBEDTLS_SHA256_C and/or "
42 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
43 "MBEDTLS_CTR_DRBG_C not defined.\n");
44 mbedtls_exit( 0 );
45 }
46 #else
47
48 #include "mbedtls/md.h"
49 #include "mbedtls/pem.h"
50 #include "mbedtls/pk.h"
51 #include "mbedtls/md.h"
52
53 #include <stdio.h>
54 #include <string.h>
55
56
main(int argc,char * argv[])57 int main( int argc, char *argv[] )
58 {
59 FILE *f;
60 int ret = 1;
61 int exit_code = MBEDTLS_EXIT_FAILURE;
62 size_t i;
63 mbedtls_pk_context pk;
64 unsigned char hash[32];
65 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
66 char filename[512];
67
68 mbedtls_pk_init( &pk );
69
70 if( argc != 3 )
71 {
72 mbedtls_printf( "usage: rsa_verify_pss <key_file> <filename>\n" );
73
74 #if defined(_WIN32)
75 mbedtls_printf( "\n" );
76 #endif
77
78 goto exit;
79 }
80
81 mbedtls_printf( "\n . Reading public key from '%s'", argv[1] );
82 fflush( stdout );
83
84 if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
85 {
86 mbedtls_printf( " failed\n ! Could not read key from '%s'\n", argv[1] );
87 mbedtls_printf( " ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret );
88 goto exit;
89 }
90
91 if( !mbedtls_pk_can_do( &pk, MBEDTLS_PK_RSA ) )
92 {
93 mbedtls_printf( " failed\n ! Key is not an RSA key\n" );
94 goto exit;
95 }
96
97 if( ( ret = mbedtls_rsa_set_padding( mbedtls_pk_rsa( pk ),
98 MBEDTLS_RSA_PKCS_V21,
99 MBEDTLS_MD_SHA256 ) ) != 0 )
100 {
101 mbedtls_printf( " failed\n ! Invalid padding\n" );
102 goto exit;
103 }
104
105 /*
106 * Extract the RSA signature from the file
107 */
108 mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
109
110 if( ( f = fopen( filename, "rb" ) ) == NULL )
111 {
112 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
113 goto exit;
114 }
115
116 i = fread( buf, 1, MBEDTLS_MPI_MAX_SIZE, 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 RSA/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 %d\n\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(_WIN32)
150 mbedtls_printf( " + Press Enter to exit this program.\n" );
151 fflush( stdout ); getchar();
152 #endif
153
154 mbedtls_exit( exit_code );
155 }
156 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
157 MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
158