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 #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_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
35 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_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_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
41 "MBEDTLS_SHA256_C and/or MBEDTLS_MD_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/error.h"
49 #include "mbedtls/entropy.h"
50 #include "mbedtls/ctr_drbg.h"
51 #include "mbedtls/md.h"
52 #include "mbedtls/pk.h"
53
54 #include <stdio.h>
55 #include <string.h>
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 mbedtls_pk_context pk;
63 mbedtls_entropy_context entropy;
64 mbedtls_ctr_drbg_context ctr_drbg;
65 unsigned char hash[32];
66 unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
67 char filename[512];
68 const char *pers = "mbedtls_pk_sign";
69 size_t olen = 0;
70
71 mbedtls_entropy_init( &entropy );
72 mbedtls_ctr_drbg_init( &ctr_drbg );
73 mbedtls_pk_init( &pk );
74
75 if( argc != 3 )
76 {
77 mbedtls_printf( "usage: mbedtls_pk_sign <key_file> <filename>\n" );
78
79 #if defined(_WIN32)
80 mbedtls_printf( "\n" );
81 #endif
82
83 goto exit;
84 }
85
86 mbedtls_printf( "\n . Seeding the random number generator..." );
87 fflush( stdout );
88
89 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
90 (const unsigned char *) pers,
91 strlen( pers ) ) ) != 0 )
92 {
93 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n", (unsigned int) -ret );
94 goto exit;
95 }
96
97 mbedtls_printf( "\n . Reading private key from '%s'", argv[1] );
98 fflush( stdout );
99
100 if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "",
101 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
102 {
103 mbedtls_printf( " failed\n ! Could not parse '%s'\n", argv[1] );
104 goto exit;
105 }
106
107 /*
108 * Compute the SHA-256 hash of the input file,
109 * then calculate the signature of the hash.
110 */
111 mbedtls_printf( "\n . Generating the SHA-256 signature" );
112 fflush( stdout );
113
114 if( ( ret = mbedtls_md_file(
115 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
116 argv[2], hash ) ) != 0 )
117 {
118 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
119 goto exit;
120 }
121
122 if( ( ret = mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, 0,
123 buf, sizeof( buf ), &olen,
124 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
125 {
126 mbedtls_printf( " failed\n ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret );
127 goto exit;
128 }
129
130 /*
131 * Write the signature into <filename>.sig
132 */
133 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
134
135 if( ( f = fopen( filename, "wb+" ) ) == NULL )
136 {
137 mbedtls_printf( " failed\n ! Could not create %s\n\n", filename );
138 goto exit;
139 }
140
141 if( fwrite( buf, 1, olen, f ) != olen )
142 {
143 mbedtls_printf( "failed\n ! fwrite failed\n\n" );
144 fclose( f );
145 goto exit;
146 }
147
148 fclose( f );
149
150 mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename );
151
152 exit_code = MBEDTLS_EXIT_SUCCESS;
153
154 exit:
155 mbedtls_pk_free( &pk );
156 mbedtls_ctr_drbg_free( &ctr_drbg );
157 mbedtls_entropy_free( &entropy );
158
159 #if defined(MBEDTLS_ERROR_C)
160 if( exit_code != MBEDTLS_EXIT_SUCCESS )
161 {
162 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
163 mbedtls_printf( " ! Last error was: %s\n", buf );
164 }
165 #endif
166
167 #if defined(_WIN32)
168 mbedtls_printf( " + Press Enter to exit this program.\n" );
169 fflush( stdout ); getchar();
170 #endif
171
172 mbedtls_exit( exit_code );
173 }
174 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
175 MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
176 MBEDTLS_CTR_DRBG_C */
177