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 #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_CTR_DRBG_C) && defined(MBEDTLS_ENTROPY_C) && \
39 defined(MBEDTLS_FS_IO)
40 #include "mbedtls/entropy.h"
41 #include "mbedtls/ctr_drbg.h"
42
43 #include <stdio.h>
44 #endif
45
46 #if !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_ENTROPY_C) || \
47 !defined(MBEDTLS_FS_IO)
main(void)48 int main( void )
49 {
50 mbedtls_printf("MBEDTLS_CTR_DRBG_C and/or MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
51 mbedtls_exit( 0 );
52 }
53 #else
54
55
main(int argc,char * argv[])56 int main( int argc, char *argv[] )
57 {
58 FILE *f;
59 int i, k, ret = 1;
60 int exit_code = MBEDTLS_EXIT_FAILURE;
61 mbedtls_ctr_drbg_context ctr_drbg;
62 mbedtls_entropy_context entropy;
63 unsigned char buf[1024];
64
65 mbedtls_ctr_drbg_init( &ctr_drbg );
66
67 if( argc < 2 )
68 {
69 mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
70 mbedtls_exit( exit_code );
71 }
72
73 if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
74 {
75 mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
76 mbedtls_exit( exit_code );
77 }
78
79 mbedtls_entropy_init( &entropy );
80 ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *) "RANDOM_GEN", 10 );
81 if( ret != 0 )
82 {
83 mbedtls_printf( "failed in mbedtls_ctr_drbg_seed: %d\n", ret );
84 goto cleanup;
85 }
86 mbedtls_ctr_drbg_set_prediction_resistance( &ctr_drbg, MBEDTLS_CTR_DRBG_PR_OFF );
87
88 #if defined(MBEDTLS_FS_IO)
89 ret = mbedtls_ctr_drbg_update_seed_file( &ctr_drbg, "seedfile" );
90
91 if( ret == MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR )
92 {
93 mbedtls_printf( "Failed to open seedfile. Generating one.\n" );
94 ret = mbedtls_ctr_drbg_write_seed_file( &ctr_drbg, "seedfile" );
95 if( ret != 0 )
96 {
97 mbedtls_printf( "failed in mbedtls_ctr_drbg_write_seed_file: %d\n", ret );
98 goto cleanup;
99 }
100 }
101 else if( ret != 0 )
102 {
103 mbedtls_printf( "failed in mbedtls_ctr_drbg_update_seed_file: %d\n", ret );
104 goto cleanup;
105 }
106 #endif
107
108 for( i = 0, k = 768; i < k; i++ )
109 {
110 ret = mbedtls_ctr_drbg_random( &ctr_drbg, buf, sizeof( buf ) );
111 if( ret != 0 )
112 {
113 mbedtls_printf("failed!\n");
114 goto cleanup;
115 }
116
117 fwrite( buf, 1, sizeof( buf ), f );
118
119 mbedtls_printf( "Generating %ldkb of data in file '%s'... %04.1f" \
120 "%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
121 fflush( stdout );
122 }
123
124 exit_code = MBEDTLS_EXIT_SUCCESS;
125
126 cleanup:
127 mbedtls_printf("\n");
128
129 fclose( f );
130 mbedtls_ctr_drbg_free( &ctr_drbg );
131 mbedtls_entropy_free( &entropy );
132
133 mbedtls_exit( exit_code );
134 }
135 #endif /* MBEDTLS_CTR_DRBG_C && MBEDTLS_ENTROPY_C */
136
