1 /*
2 * Public key-based simple decryption 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_printf printf
34 #define mbedtls_exit exit
35 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
36 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
37 #endif /* MBEDTLS_PLATFORM_C */
38
39 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_PK_PARSE_C) && \
40 defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
41 defined(MBEDTLS_CTR_DRBG_C)
42 #include "mbedtls/error.h"
43 #include "mbedtls/pk.h"
44 #include "mbedtls/entropy.h"
45 #include "mbedtls/ctr_drbg.h"
46
47 #include <stdio.h>
48 #include <string.h>
49 #endif
50
51
52 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PK_PARSE_C) || \
53 !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \
54 !defined(MBEDTLS_CTR_DRBG_C)
main(void)55 int main( void )
56 {
57 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_PK_PARSE_C and/or "
58 "MBEDTLS_FS_IO and/or MBEDTLS_ENTROPY_C and/or "
59 "MBEDTLS_CTR_DRBG_C not defined.\n");
60 return( 0 );
61 }
62 #else
63
64 #if defined(MBEDTLS_CHECK_PARAMS)
65 #include "mbedtls/platform_util.h"
mbedtls_param_failed(const char * failure_condition,const char * file,int line)66 void mbedtls_param_failed( const char *failure_condition,
67 const char *file,
68 int line )
69 {
70 mbedtls_printf( "%s:%i: Input param failed - %s\n",
71 file, line, failure_condition );
72 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
73 }
74 #endif
75
main(int argc,char * argv[])76 int main( int argc, char *argv[] )
77 {
78 FILE *f;
79 int ret = 1, c;
80 int exit_code = MBEDTLS_EXIT_FAILURE;
81 size_t i, olen = 0;
82 mbedtls_pk_context pk;
83 mbedtls_entropy_context entropy;
84 mbedtls_ctr_drbg_context ctr_drbg;
85 unsigned char result[1024];
86 unsigned char buf[512];
87 const char *pers = "mbedtls_pk_decrypt";
88 ((void) argv);
89
90 mbedtls_pk_init( &pk );
91 mbedtls_entropy_init( &entropy );
92 mbedtls_ctr_drbg_init( &ctr_drbg );
93
94 memset(result, 0, sizeof( result ) );
95
96 if( argc != 2 )
97 {
98 mbedtls_printf( "usage: mbedtls_pk_decrypt <key_file>\n" );
99
100 #if defined(_WIN32)
101 mbedtls_printf( "\n" );
102 #endif
103
104 goto exit;
105 }
106
107 mbedtls_printf( "\n . Seeding the random number generator..." );
108 fflush( stdout );
109
110 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
111 &entropy, (const unsigned char *) pers,
112 strlen( pers ) ) ) != 0 )
113 {
114 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
115 -ret );
116 goto exit;
117 }
118
119 mbedtls_printf( "\n . Reading private key from '%s'", argv[1] );
120 fflush( stdout );
121
122 if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
123 {
124 mbedtls_printf( " failed\n ! mbedtls_pk_parse_keyfile returned -0x%04x\n", -ret );
125 goto exit;
126 }
127
128 /*
129 * Extract the RSA encrypted value from the text file
130 */
131 if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
132 {
133 mbedtls_printf( "\n ! Could not open %s\n\n", "result-enc.txt" );
134 ret = 1;
135 goto exit;
136 }
137
138 i = 0;
139 while( fscanf( f, "%02X", &c ) > 0 &&
140 i < (int) sizeof( buf ) )
141 {
142 buf[i++] = (unsigned char) c;
143 }
144
145 fclose( f );
146
147 /*
148 * Decrypt the encrypted RSA data and print the result.
149 */
150 mbedtls_printf( "\n . Decrypting the encrypted data" );
151 fflush( stdout );
152
153 if( ( ret = mbedtls_pk_decrypt( &pk, buf, i, result, &olen, sizeof(result),
154 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
155 {
156 mbedtls_printf( " failed\n ! mbedtls_pk_decrypt returned -0x%04x\n",
157 -ret );
158 goto exit;
159 }
160
161 mbedtls_printf( "\n . OK\n\n" );
162
163 mbedtls_printf( "The decrypted result is: '%s'\n\n", result );
164
165 exit_code = MBEDTLS_EXIT_SUCCESS;
166
167 exit:
168
169 mbedtls_pk_free( &pk );
170 mbedtls_entropy_free( &entropy );
171 mbedtls_ctr_drbg_free( &ctr_drbg );
172
173 #if defined(MBEDTLS_ERROR_C)
174 if( exit_code != MBEDTLS_EXIT_SUCCESS )
175 {
176 mbedtls_strerror( ret, (char *) buf, sizeof( buf ) );
177 mbedtls_printf( " ! Last error was: %s\n", buf );
178 }
179 #endif
180
181 #if defined(_WIN32)
182 mbedtls_printf( " + Press Enter to exit this program.\n" );
183 fflush( stdout ); getchar();
184 #endif
185
186 return( exit_code );
187 }
188 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
189 MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
190