1 /*
2 * RSA simple data encryption 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 #if !defined(MBEDTLS_CONFIG_FILE)
21 #include "mbedtls/config.h"
22 #else
23 #include MBEDTLS_CONFIG_FILE
24 #endif
25
26 #if defined(MBEDTLS_PLATFORM_C)
27 #include "mbedtls/platform.h"
28 #else
29 #include <stdio.h>
30 #include <stdlib.h>
31 #define mbedtls_fprintf fprintf
32 #define mbedtls_printf printf
33 #define mbedtls_exit exit
34 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
35 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
36 #endif /* MBEDTLS_PLATFORM_C */
37
38 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \
39 defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
40 defined(MBEDTLS_CTR_DRBG_C)
41 #include "mbedtls/rsa.h"
42 #include "mbedtls/entropy.h"
43 #include "mbedtls/ctr_drbg.h"
44
45 #include <string.h>
46 #endif
47
48 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
49 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
50 !defined(MBEDTLS_CTR_DRBG_C)
main(void)51 int main( void )
52 {
53 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
54 "MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
55 "MBEDTLS_CTR_DRBG_C not defined.\n");
56 mbedtls_exit( 0 );
57 }
58 #else
59
60
main(int argc,char * argv[])61 int main( int argc, char *argv[] )
62 {
63 FILE *f;
64 int ret = 1;
65 int exit_code = MBEDTLS_EXIT_FAILURE;
66 size_t i;
67 mbedtls_rsa_context rsa;
68 mbedtls_entropy_context entropy;
69 mbedtls_ctr_drbg_context ctr_drbg;
70 unsigned char input[1024];
71 unsigned char buf[512];
72 const char *pers = "rsa_encrypt";
73 mbedtls_mpi N, E;
74
75 if( argc != 2 )
76 {
77 mbedtls_printf( "usage: rsa_encrypt <string of max 100 characters>\n" );
78
79 #if defined(_WIN32)
80 mbedtls_printf( "\n" );
81 #endif
82
83 mbedtls_exit( exit_code );
84 }
85
86 mbedtls_printf( "\n . Seeding the random number generator..." );
87 fflush( stdout );
88
89 mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
90 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
91 mbedtls_ctr_drbg_init( &ctr_drbg );
92 mbedtls_entropy_init( &entropy );
93
94 ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
95 &entropy, (const unsigned char *) pers,
96 strlen( pers ) );
97 if( ret != 0 )
98 {
99 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n",
100 ret );
101 goto exit;
102 }
103
104 mbedtls_printf( "\n . Reading public key from rsa_pub.txt" );
105 fflush( stdout );
106
107 if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
108 {
109 mbedtls_printf( " failed\n ! Could not open rsa_pub.txt\n" \
110 " ! Please run rsa_genkey first\n\n" );
111 goto exit;
112 }
113
114 if( ( ret = mbedtls_mpi_read_file( &N, 16, f ) ) != 0 ||
115 ( ret = mbedtls_mpi_read_file( &E, 16, f ) ) != 0 )
116 {
117 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n",
118 ret );
119 fclose( f );
120 goto exit;
121 }
122 fclose( f );
123
124 if( ( ret = mbedtls_rsa_import( &rsa, &N, NULL, NULL, NULL, &E ) ) != 0 )
125 {
126 mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n",
127 ret );
128 goto exit;
129 }
130
131 if( strlen( argv[1] ) > 100 )
132 {
133 mbedtls_printf( " Input data larger than 100 characters.\n\n" );
134 goto exit;
135 }
136
137 memcpy( input, argv[1], strlen( argv[1] ) );
138
139 /*
140 * Calculate the RSA encryption of the hash.
141 */
142 mbedtls_printf( "\n . Generating the RSA encrypted value" );
143 fflush( stdout );
144
145 ret = mbedtls_rsa_pkcs1_encrypt( &rsa, mbedtls_ctr_drbg_random,
146 &ctr_drbg, MBEDTLS_RSA_PUBLIC,
147 strlen( argv[1] ), input, buf );
148 if( ret != 0 )
149 {
150 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n",
151 ret );
152 goto exit;
153 }
154
155 /*
156 * Write the signature into result-enc.txt
157 */
158 if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
159 {
160 mbedtls_printf( " failed\n ! Could not create %s\n\n", "result-enc.txt" );
161 goto exit;
162 }
163
164 for( i = 0; i < rsa.len; i++ )
165 mbedtls_fprintf( f, "%02X%s", buf[i],
166 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
167
168 fclose( f );
169
170 mbedtls_printf( "\n . Done (created \"%s\")\n\n", "result-enc.txt" );
171
172 exit_code = MBEDTLS_EXIT_SUCCESS;
173
174 exit:
175 mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
176 mbedtls_ctr_drbg_free( &ctr_drbg );
177 mbedtls_entropy_free( &entropy );
178 mbedtls_rsa_free( &rsa );
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_ENTROPY_C &&
188 MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
189
