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_PK_PARSE_C) && \
41     defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
42     defined(MBEDTLS_CTR_DRBG_C)
43 #include "mbedtls/error.h"
44 #include "mbedtls/pk.h"
45 #include "mbedtls/entropy.h"
46 #include "mbedtls/ctr_drbg.h"
47 
48 #include <stdio.h>
49 #include <string.h>
50 #endif
51 
52 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PK_PARSE_C) ||  \
53     !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
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_ENTROPY_C and/or MBEDTLS_FS_IO 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;
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 input[1024];
86     unsigned char buf[512];
87     const char *pers = "mbedtls_pk_encrypt";
88 
89     mbedtls_ctr_drbg_init( &ctr_drbg );
90     mbedtls_entropy_init( &entropy );
91     mbedtls_pk_init( &pk );
92 
93     if( argc != 3 )
94     {
95         mbedtls_printf( "usage: mbedtls_pk_encrypt <key_file> <string of max 100 characters>\n" );
96 
97 #if defined(_WIN32)
98         mbedtls_printf( "\n" );
99 #endif
100 
101         goto exit;
102     }
103 
104     mbedtls_printf( "\n  . Seeding the random number generator..." );
105     fflush( stdout );
106 
107     if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
108                                        &entropy, (const unsigned char *) pers,
109                                        strlen( pers ) ) ) != 0 )
110     {
111         mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
112                         -ret );
113         goto exit;
114     }
115 
116     mbedtls_printf( "\n  . Reading public key from '%s'", argv[1] );
117     fflush( stdout );
118 
119     if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
120     {
121         mbedtls_printf( " failed\n  ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", -ret );
122         goto exit;
123     }
124 
125     if( strlen( argv[2] ) > 100 )
126     {
127         mbedtls_printf( " Input data larger than 100 characters.\n\n" );
128         goto exit;
129     }
130 
131     memcpy( input, argv[2], strlen( argv[2] ) );
132 
133     /*
134      * Calculate the RSA encryption of the hash.
135      */
136     mbedtls_printf( "\n  . Generating the encrypted value" );
137     fflush( stdout );
138 
139     if( ( ret = mbedtls_pk_encrypt( &pk, input, strlen( argv[2] ),
140                             buf, &olen, sizeof(buf),
141                             mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
142     {
143         mbedtls_printf( " failed\n  ! mbedtls_pk_encrypt returned -0x%04x\n",
144                         -ret );
145         goto exit;
146     }
147 
148     /*
149      * Write the signature into result-enc.txt
150      */
151     if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
152     {
153         mbedtls_printf( " failed\n  ! Could not create %s\n\n",
154                         "result-enc.txt" );
155         ret = 1;
156         goto exit;
157     }
158 
159     for( i = 0; i < olen; i++ )
160     {
161         mbedtls_fprintf( f, "%02X%s", buf[i],
162                  ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
163     }
164 
165     fclose( f );
166 
167     mbedtls_printf( "\n  . Done (created \"%s\")\n\n", "result-enc.txt" );
168 
169     exit_code = MBEDTLS_EXIT_SUCCESS;
170 
171 exit:
172 
173     mbedtls_pk_free( &pk );
174     mbedtls_entropy_free( &entropy );
175     mbedtls_ctr_drbg_free( &ctr_drbg );
176 
177 #if defined(MBEDTLS_ERROR_C)
178     if( exit_code != MBEDTLS_EXIT_SUCCESS )
179     {
180         mbedtls_strerror( ret, (char *) buf, sizeof( buf ) );
181         mbedtls_printf( "  !  Last error was: %s\n", buf );
182     }
183 #endif
184 
185 #if defined(_WIN32)
186     mbedtls_printf( "  + Press Enter to exit this program.\n" );
187     fflush( stdout ); getchar();
188 #endif
189 
190     return( exit_code );
191 }
192 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_ENTROPY_C &&
193           MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
194