1 /**
2 * \brief Use and generate random data into a file via the CTR_DBRG based on AES
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_exit exit
30 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
31 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
32 #endif /* MBEDTLS_PLATFORM_C */
33
34 #if defined(MBEDTLS_CTR_DRBG_C) && defined(MBEDTLS_ENTROPY_C) && \
35 defined(MBEDTLS_FS_IO)
36 #include "mbedtls/entropy.h"
37 #include "mbedtls/ctr_drbg.h"
38
39 #include <stdio.h>
40 #endif
41
42 #if !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_ENTROPY_C) || \
43 !defined(MBEDTLS_FS_IO)
main(void)44 int main( void )
45 {
46 mbedtls_printf("MBEDTLS_CTR_DRBG_C and/or MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
47 mbedtls_exit( 0 );
48 }
49 #else
50
51
main(int argc,char * argv[])52 int main( int argc, char *argv[] )
53 {
54 FILE *f;
55 int i, k, ret = 1;
56 int exit_code = MBEDTLS_EXIT_FAILURE;
57 mbedtls_ctr_drbg_context ctr_drbg;
58 mbedtls_entropy_context entropy;
59 unsigned char buf[1024];
60
61 mbedtls_ctr_drbg_init( &ctr_drbg );
62
63 if( argc < 2 )
64 {
65 mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
66 mbedtls_exit( exit_code );
67 }
68
69 if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
70 {
71 mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
72 mbedtls_exit( exit_code );
73 }
74
75 mbedtls_entropy_init( &entropy );
76 ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *) "RANDOM_GEN", 10 );
77 if( ret != 0 )
78 {
79 mbedtls_printf( "failed in mbedtls_ctr_drbg_seed: %d\n", ret );
80 goto cleanup;
81 }
82 mbedtls_ctr_drbg_set_prediction_resistance( &ctr_drbg, MBEDTLS_CTR_DRBG_PR_OFF );
83
84 #if defined(MBEDTLS_FS_IO)
85 ret = mbedtls_ctr_drbg_update_seed_file( &ctr_drbg, "seedfile" );
86
87 if( ret == MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR )
88 {
89 mbedtls_printf( "Failed to open seedfile. Generating one.\n" );
90 ret = mbedtls_ctr_drbg_write_seed_file( &ctr_drbg, "seedfile" );
91 if( ret != 0 )
92 {
93 mbedtls_printf( "failed in mbedtls_ctr_drbg_write_seed_file: %d\n", ret );
94 goto cleanup;
95 }
96 }
97 else if( ret != 0 )
98 {
99 mbedtls_printf( "failed in mbedtls_ctr_drbg_update_seed_file: %d\n", ret );
100 goto cleanup;
101 }
102 #endif
103
104 for( i = 0, k = 768; i < k; i++ )
105 {
106 ret = mbedtls_ctr_drbg_random( &ctr_drbg, buf, sizeof( buf ) );
107 if( ret != 0 )
108 {
109 mbedtls_printf("failed!\n");
110 goto cleanup;
111 }
112
113 fwrite( buf, 1, sizeof( buf ), f );
114
115 mbedtls_printf( "Generating %ldkb of data in file '%s'... %04.1f" \
116 "%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
117 fflush( stdout );
118 }
119
120 exit_code = MBEDTLS_EXIT_SUCCESS;
121
122 cleanup:
123 mbedtls_printf("\n");
124
125 fclose( f );
126 mbedtls_ctr_drbg_free( &ctr_drbg );
127 mbedtls_entropy_free( &entropy );
128
129 mbedtls_exit( exit_code );
130 }
131 #endif /* MBEDTLS_CTR_DRBG_C && MBEDTLS_ENTROPY_C */
132