1 /*
2 * RSA/SHA-256 signature creation 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 #define mbedtls_fprintf fprintf
33 #define mbedtls_printf printf
34 #define mbedtls_snprintf snprintf
35 #endif
36
37 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
38 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
39 !defined(MBEDTLS_FS_IO)
main(void)40 int main( void )
41 {
42 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
43 "MBEDTLS_MD_C and/or "
44 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
45 return( 0 );
46 }
47 #else
48
49 #include "mbedtls/rsa.h"
50 #include "mbedtls/md.h"
51
52 #include <stdio.h>
53 #include <string.h>
54
main(int argc,char * argv[])55 int main( int argc, char *argv[] )
56 {
57 FILE *f;
58 int ret;
59 size_t i;
60 mbedtls_rsa_context rsa;
61 unsigned char hash[32];
62 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
63 char filename[512];
64
65 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
66 ret = 1;
67
68 if( argc != 2 )
69 {
70 mbedtls_printf( "usage: rsa_sign <filename>\n" );
71
72 #if defined(_WIN32)
73 mbedtls_printf( "\n" );
74 #endif
75
76 goto exit;
77 }
78
79 mbedtls_printf( "\n . Reading private key from rsa_priv.txt" );
80 fflush( stdout );
81
82 if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
83 {
84 ret = 1;
85 mbedtls_printf( " failed\n ! Could not open rsa_priv.txt\n" \
86 " ! Please run rsa_genkey first\n\n" );
87 goto exit;
88 }
89
90 if( ( ret = mbedtls_mpi_read_file( &rsa.N , 16, f ) ) != 0 ||
91 ( ret = mbedtls_mpi_read_file( &rsa.E , 16, f ) ) != 0 ||
92 ( ret = mbedtls_mpi_read_file( &rsa.D , 16, f ) ) != 0 ||
93 ( ret = mbedtls_mpi_read_file( &rsa.P , 16, f ) ) != 0 ||
94 ( ret = mbedtls_mpi_read_file( &rsa.Q , 16, f ) ) != 0 ||
95 ( ret = mbedtls_mpi_read_file( &rsa.DP, 16, f ) ) != 0 ||
96 ( ret = mbedtls_mpi_read_file( &rsa.DQ, 16, f ) ) != 0 ||
97 ( ret = mbedtls_mpi_read_file( &rsa.QP, 16, f ) ) != 0 )
98 {
99 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret );
100 fclose( f );
101 goto exit;
102 }
103
104 rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3;
105
106 fclose( f );
107
108 mbedtls_printf( "\n . Checking the private key" );
109 fflush( stdout );
110 if( ( ret = mbedtls_rsa_check_privkey( &rsa ) ) != 0 )
111 {
112 mbedtls_printf( " failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n", -ret );
113 goto exit;
114 }
115
116 /*
117 * Compute the SHA-256 hash of the input file,
118 * then calculate the RSA signature of the hash.
119 */
120 mbedtls_printf( "\n . Generating the RSA/SHA-256 signature" );
121 fflush( stdout );
122
123 if( ( ret = mbedtls_md_file(
124 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
125 argv[1], hash ) ) != 0 )
126 {
127 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[1] );
128 goto exit;
129 }
130
131 if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
132 20, hash, buf ) ) != 0 )
133 {
134 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n", -ret );
135 goto exit;
136 }
137
138 /*
139 * Write the signature into <filename>.sig
140 */
141 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
142
143 if( ( f = fopen( filename, "wb+" ) ) == NULL )
144 {
145 ret = 1;
146 mbedtls_printf( " failed\n ! Could not create %s\n\n", argv[1] );
147 goto exit;
148 }
149
150 for( i = 0; i < rsa.len; i++ )
151 mbedtls_fprintf( f, "%02X%s", buf[i],
152 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
153
154 fclose( f );
155
156 mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename );
157
158 exit:
159
160 mbedtls_rsa_free( &rsa );
161
162 #if defined(_WIN32)
163 mbedtls_printf( " + Press Enter to exit this program.\n" );
164 fflush( stdout ); getchar();
165 #endif
166
167 return( ret );
168 }
169 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
170 MBEDTLS_FS_IO */
171
