1 /*
2 * RSA simple data encryption 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 #include <stdlib.h>
33 #define mbedtls_fprintf fprintf
34 #define mbedtls_printf printf
35 #define mbedtls_exit exit
36 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
37 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
38 #endif /* MBEDTLS_PLATFORM_C */
39
40 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \
41 defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
42 defined(MBEDTLS_CTR_DRBG_C)
43 #include "mbedtls/rsa.h"
44 #include "mbedtls/entropy.h"
45 #include "mbedtls/ctr_drbg.h"
46
47 #include <string.h>
48 #endif
49
50 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
51 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
52 !defined(MBEDTLS_CTR_DRBG_C)
main(void)53 int main( void )
54 {
55 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
56 "MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
57 "MBEDTLS_CTR_DRBG_C not defined.\n");
58 return( 0 );
59 }
60 #else
61
62 #if defined(MBEDTLS_CHECK_PARAMS)
63 #include "mbedtls/platform_util.h"
mbedtls_param_failed(const char * failure_condition,const char * file,int line)64 void mbedtls_param_failed( const char *failure_condition,
65 const char *file,
66 int line )
67 {
68 mbedtls_printf( "%s:%i: Input param failed - %s\n",
69 file, line, failure_condition );
70 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
71 }
72 #endif
73
main(int argc,char * argv[])74 int main( int argc, char *argv[] )
75 {
76 FILE *f;
77 int ret = 1;
78 int exit_code = MBEDTLS_EXIT_FAILURE;
79 size_t i;
80 mbedtls_rsa_context rsa;
81 mbedtls_entropy_context entropy;
82 mbedtls_ctr_drbg_context ctr_drbg;
83 unsigned char input[1024];
84 unsigned char buf[512];
85 const char *pers = "rsa_encrypt";
86 mbedtls_mpi N, E;
87
88 if( argc != 2 )
89 {
90 mbedtls_printf( "usage: rsa_encrypt <string of max 100 characters>\n" );
91
92 #if defined(_WIN32)
93 mbedtls_printf( "\n" );
94 #endif
95
96 mbedtls_exit( exit_code );
97 }
98
99 mbedtls_printf( "\n . Seeding the random number generator..." );
100 fflush( stdout );
101
102 mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
103 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
104 mbedtls_ctr_drbg_init( &ctr_drbg );
105 mbedtls_entropy_init( &entropy );
106
107 ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
108 &entropy, (const unsigned char *) pers,
109 strlen( pers ) );
110 if( ret != 0 )
111 {
112 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n",
113 ret );
114 goto exit;
115 }
116
117 mbedtls_printf( "\n . Reading public key from rsa_pub.txt" );
118 fflush( stdout );
119
120 if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
121 {
122 mbedtls_printf( " failed\n ! Could not open rsa_pub.txt\n" \
123 " ! Please run rsa_genkey first\n\n" );
124 goto exit;
125 }
126
127 if( ( ret = mbedtls_mpi_read_file( &N, 16, f ) ) != 0 ||
128 ( ret = mbedtls_mpi_read_file( &E, 16, f ) ) != 0 )
129 {
130 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n",
131 ret );
132 fclose( f );
133 goto exit;
134 }
135 fclose( f );
136
137 if( ( ret = mbedtls_rsa_import( &rsa, &N, NULL, NULL, NULL, &E ) ) != 0 )
138 {
139 mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n",
140 ret );
141 goto exit;
142 }
143
144 if( strlen( argv[1] ) > 100 )
145 {
146 mbedtls_printf( " Input data larger than 100 characters.\n\n" );
147 goto exit;
148 }
149
150 memcpy( input, argv[1], strlen( argv[1] ) );
151
152 /*
153 * Calculate the RSA encryption of the hash.
154 */
155 mbedtls_printf( "\n . Generating the RSA encrypted value" );
156 fflush( stdout );
157
158 ret = mbedtls_rsa_pkcs1_encrypt( &rsa, mbedtls_ctr_drbg_random,
159 &ctr_drbg, MBEDTLS_RSA_PUBLIC,
160 strlen( argv[1] ), input, buf );
161 if( ret != 0 )
162 {
163 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n",
164 ret );
165 goto exit;
166 }
167
168 /*
169 * Write the signature into result-enc.txt
170 */
171 if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
172 {
173 mbedtls_printf( " failed\n ! Could not create %s\n\n", "result-enc.txt" );
174 goto exit;
175 }
176
177 for( i = 0; i < rsa.len; i++ )
178 mbedtls_fprintf( f, "%02X%s", buf[i],
179 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
180
181 fclose( f );
182
183 mbedtls_printf( "\n . Done (created \"%s\")\n\n", "result-enc.txt" );
184
185 exit_code = MBEDTLS_EXIT_SUCCESS;
186
187 exit:
188 mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
189 mbedtls_ctr_drbg_free( &ctr_drbg );
190 mbedtls_entropy_free( &entropy );
191 mbedtls_rsa_free( &rsa );
192
193 #if defined(_WIN32)
194 mbedtls_printf( " + Press Enter to exit this program.\n" );
195 fflush( stdout ); getchar();
196 #endif
197
198 return( exit_code );
199 }
200 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_ENTROPY_C &&
201 MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
202