1 /*
2 * Public key-based 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 #include "mbedtls/platform.h"
23
24 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
25 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
26 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
27 !defined(MBEDTLS_CTR_DRBG_C)
main(void)28 int main( void )
29 {
30 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
31 "MBEDTLS_SHA256_C and/or MBEDTLS_MD_C and/or "
32 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
33 "MBEDTLS_CTR_DRBG_C not defined.\n");
34 mbedtls_exit( 0 );
35 }
36 #else
37
38 #include "mbedtls/error.h"
39 #include "mbedtls/entropy.h"
40 #include "mbedtls/ctr_drbg.h"
41 #include "mbedtls/md.h"
42 #include "mbedtls/pk.h"
43
44 #include <stdio.h>
45 #include <string.h>
46
main(int argc,char * argv[])47 int main( int argc, char *argv[] )
48 {
49 FILE *f;
50 int ret = 1;
51 int exit_code = MBEDTLS_EXIT_FAILURE;
52 mbedtls_pk_context pk;
53 mbedtls_entropy_context entropy;
54 mbedtls_ctr_drbg_context ctr_drbg;
55 unsigned char hash[32];
56 unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
57 char filename[512];
58 const char *pers = "mbedtls_pk_sign";
59 size_t olen = 0;
60
61 mbedtls_entropy_init( &entropy );
62 mbedtls_ctr_drbg_init( &ctr_drbg );
63 mbedtls_pk_init( &pk );
64
65 if( argc != 3 )
66 {
67 mbedtls_printf( "usage: mbedtls_pk_sign <key_file> <filename>\n" );
68
69 #if defined(_WIN32)
70 mbedtls_printf( "\n" );
71 #endif
72
73 goto exit;
74 }
75
76 mbedtls_printf( "\n . Seeding the random number generator..." );
77 fflush( stdout );
78
79 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
80 (const unsigned char *) pers,
81 strlen( pers ) ) ) != 0 )
82 {
83 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n", (unsigned int) -ret );
84 goto exit;
85 }
86
87 mbedtls_printf( "\n . Reading private key from '%s'", argv[1] );
88 fflush( stdout );
89
90 if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "",
91 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
92 {
93 mbedtls_printf( " failed\n ! Could not parse '%s'\n", argv[1] );
94 goto exit;
95 }
96
97 /*
98 * Compute the SHA-256 hash of the input file,
99 * then calculate the signature of the hash.
100 */
101 mbedtls_printf( "\n . Generating the SHA-256 signature" );
102 fflush( stdout );
103
104 if( ( ret = mbedtls_md_file(
105 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
106 argv[2], hash ) ) != 0 )
107 {
108 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
109 goto exit;
110 }
111
112 if( ( ret = mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, 0,
113 buf, sizeof( buf ), &olen,
114 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
115 {
116 mbedtls_printf( " failed\n ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret );
117 goto exit;
118 }
119
120 /*
121 * Write the signature into <filename>.sig
122 */
123 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
124
125 if( ( f = fopen( filename, "wb+" ) ) == NULL )
126 {
127 mbedtls_printf( " failed\n ! Could not create %s\n\n", filename );
128 goto exit;
129 }
130
131 if( fwrite( buf, 1, olen, f ) != olen )
132 {
133 mbedtls_printf( "failed\n ! fwrite failed\n\n" );
134 fclose( f );
135 goto exit;
136 }
137
138 fclose( f );
139
140 mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename );
141
142 exit_code = MBEDTLS_EXIT_SUCCESS;
143
144 exit:
145 mbedtls_pk_free( &pk );
146 mbedtls_ctr_drbg_free( &ctr_drbg );
147 mbedtls_entropy_free( &entropy );
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 mbedtls_exit( exit_code );
158 }
159 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
160 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
161 MBEDTLS_CTR_DRBG_C */
162
