1 /*
2 * RSA/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_fprintf fprintf
28 #define mbedtls_printf printf
29 #define mbedtls_snprintf snprintf
30 #define mbedtls_exit exit
31 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
32 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
33 #endif /* MBEDTLS_PLATFORM_C */
34
35 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
36 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
37 !defined(MBEDTLS_FS_IO)
main(void)38 int main( void )
39 {
40 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
41 "MBEDTLS_MD_C and/or "
42 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
43 mbedtls_exit( 0 );
44 }
45 #else
46
47 #include "mbedtls/rsa.h"
48 #include "mbedtls/md.h"
49
50 #include <stdio.h>
51 #include <string.h>
52
53
main(int argc,char * argv[])54 int main( int argc, char *argv[] )
55 {
56 FILE *f;
57 int ret = 1;
58 int exit_code = MBEDTLS_EXIT_FAILURE;
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 mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
65
66 mbedtls_rsa_init( &rsa );
67
68 mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
69 mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
70 mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
71
72 if( argc != 2 )
73 {
74 mbedtls_printf( "usage: rsa_sign <filename>\n" );
75
76 #if defined(_WIN32)
77 mbedtls_printf( "\n" );
78 #endif
79
80 goto exit;
81 }
82
83 mbedtls_printf( "\n . Reading private key from rsa_priv.txt" );
84 fflush( stdout );
85
86 if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
87 {
88 mbedtls_printf( " failed\n ! Could not open rsa_priv.txt\n" \
89 " ! Please run rsa_genkey first\n\n" );
90 goto exit;
91 }
92
93 if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
94 ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
95 ( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
96 ( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
97 ( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 ||
98 ( ret = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 ||
99 ( ret = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 ||
100 ( ret = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 )
101 {
102 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret );
103 fclose( f );
104 goto exit;
105 }
106 fclose( f );
107
108 if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
109 {
110 mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n",
111 ret );
112 goto exit;
113 }
114
115 if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
116 {
117 mbedtls_printf( " failed\n ! mbedtls_rsa_complete returned %d\n\n",
118 ret );
119 goto exit;
120 }
121
122 mbedtls_printf( "\n . Checking the private key" );
123 fflush( stdout );
124 if( ( ret = mbedtls_rsa_check_privkey( &rsa ) ) != 0 )
125 {
126 mbedtls_printf( " failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n", (unsigned int) -ret );
127 goto exit;
128 }
129
130 /*
131 * Compute the SHA-256 hash of the input file,
132 * then calculate the RSA signature of the hash.
133 */
134 mbedtls_printf( "\n . Generating the RSA/SHA-256 signature" );
135 fflush( stdout );
136
137 if( ( ret = mbedtls_md_file(
138 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
139 argv[1], hash ) ) != 0 )
140 {
141 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[1] );
142 goto exit;
143 }
144
145 if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_MD_SHA256,
146 32, hash, buf ) ) != 0 )
147 {
148 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n", (unsigned int) -ret );
149 goto exit;
150 }
151
152 /*
153 * Write the signature into <filename>.sig
154 */
155 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
156
157 if( ( f = fopen( filename, "wb+" ) ) == NULL )
158 {
159 mbedtls_printf( " failed\n ! Could not create %s\n\n", argv[1] );
160 goto exit;
161 }
162
163 for( i = 0; i < rsa.MBEDTLS_PRIVATE(len); i++ )
164 mbedtls_fprintf( f, "%02X%s", buf[i],
165 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
166
167 fclose( f );
168
169 mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename );
170
171 exit_code = MBEDTLS_EXIT_SUCCESS;
172
173 exit:
174
175 mbedtls_rsa_free( &rsa );
176 mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
177 mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
178 mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
179
180 #if defined(_WIN32)
181 mbedtls_printf( " + Press Enter to exit this program.\n" );
182 fflush( stdout ); getchar();
183 #endif
184
185 mbedtls_exit( exit_code );
186 }
187 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
188 MBEDTLS_FS_IO */
189