1 /*
2 * RSASSA-PSS/SHA-256 signature creation 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/entropy.h"
49 #include "mbedtls/ctr_drbg.h"
50 #include "mbedtls/md.h"
51 #include "mbedtls/rsa.h"
52 #include "mbedtls/pk.h"
53
54 #include <stdio.h>
55 #include <string.h>
56
57
main(int argc,char * argv[])58 int main( int argc, char *argv[] )
59 {
60 FILE *f;
61 int ret = 1;
62 int exit_code = MBEDTLS_EXIT_FAILURE;
63 mbedtls_pk_context pk;
64 mbedtls_entropy_context entropy;
65 mbedtls_ctr_drbg_context ctr_drbg;
66 unsigned char hash[32];
67 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
68 char filename[512];
69 const char *pers = "rsa_sign_pss";
70 size_t olen = 0;
71
72 mbedtls_entropy_init( &entropy );
73 mbedtls_pk_init( &pk );
74 mbedtls_ctr_drbg_init( &ctr_drbg );
75
76 if( argc != 3 )
77 {
78 mbedtls_printf( "usage: rsa_sign_pss <key_file> <filename>\n" );
79
80 #if defined(_WIN32)
81 mbedtls_printf( "\n" );
82 #endif
83
84 goto exit;
85 }
86
87 mbedtls_printf( "\n . Seeding the random number generator..." );
88 fflush( stdout );
89
90 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
91 (const unsigned char *) pers,
92 strlen( pers ) ) ) != 0 )
93 {
94 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
95 goto exit;
96 }
97
98 mbedtls_printf( "\n . Reading private key from '%s'", argv[1] );
99 fflush( stdout );
100
101 if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "",
102 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
103 {
104 mbedtls_printf( " failed\n ! Could not read key from '%s'\n", argv[1] );
105 mbedtls_printf( " ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret );
106 goto exit;
107 }
108
109 if( !mbedtls_pk_can_do( &pk, MBEDTLS_PK_RSA ) )
110 {
111 mbedtls_printf( " failed\n ! Key is not an RSA key\n" );
112 goto exit;
113 }
114
115 if( ( ret = mbedtls_rsa_set_padding( mbedtls_pk_rsa( pk ),
116 MBEDTLS_RSA_PKCS_V21,
117 MBEDTLS_MD_SHA256 ) ) != 0 )
118 {
119 mbedtls_printf( " failed\n ! Padding not supported\n" );
120 goto exit;
121 }
122
123 /*
124 * Compute the SHA-256 hash of the input file,
125 * then calculate the RSA signature of the hash.
126 */
127 mbedtls_printf( "\n . Generating the RSA/SHA-256 signature" );
128 fflush( stdout );
129
130 if( ( ret = mbedtls_md_file(
131 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
132 argv[2], hash ) ) != 0 )
133 {
134 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
135 goto exit;
136 }
137
138 if( ( ret = mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, 0,
139 buf, sizeof( buf ), &olen,
140 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
141 {
142 mbedtls_printf( " failed\n ! mbedtls_pk_sign returned %d\n\n", ret );
143 goto exit;
144 }
145
146 /*
147 * Write the signature into <filename>.sig
148 */
149 mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
150
151 if( ( f = fopen( filename, "wb+" ) ) == NULL )
152 {
153 mbedtls_printf( " failed\n ! Could not create %s\n\n", filename );
154 goto exit;
155 }
156
157 if( fwrite( buf, 1, olen, f ) != olen )
158 {
159 mbedtls_printf( "failed\n ! fwrite failed\n\n" );
160 fclose( f );
161 goto exit;
162 }
163
164 fclose( f );
165
166 mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename );
167
168 exit_code = MBEDTLS_EXIT_SUCCESS;
169
170 exit:
171 mbedtls_pk_free( &pk );
172 mbedtls_ctr_drbg_free( &ctr_drbg );
173 mbedtls_entropy_free( &entropy );
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_ENTROPY_C && MBEDTLS_RSA_C &&
183 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
184 MBEDTLS_CTR_DRBG_C */
185