1 /**
2 * \brief Use and generate multiple entropies calls into a file
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_ENTROPY_C) && defined(MBEDTLS_FS_IO)
35 #include "mbedtls/entropy.h"
36
37 #include <stdio.h>
38 #endif
39
40 #if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO)
main(void)41 int main( void )
42 {
43 mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
44 mbedtls_exit( 0 );
45 }
46 #else
47
48
main(int argc,char * argv[])49 int main( int argc, char *argv[] )
50 {
51 FILE *f;
52 int i, k, ret = 1;
53 int exit_code = MBEDTLS_EXIT_FAILURE;
54 mbedtls_entropy_context entropy;
55 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
56
57 if( argc < 2 )
58 {
59 mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
60 mbedtls_exit( exit_code );
61 }
62
63 if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
64 {
65 mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
66 mbedtls_exit( exit_code );
67 }
68
69 mbedtls_entropy_init( &entropy );
70
71 for( i = 0, k = 768; i < k; i++ )
72 {
73 ret = mbedtls_entropy_func( &entropy, buf, sizeof( buf ) );
74 if( ret != 0 )
75 {
76 mbedtls_printf( " failed\n ! mbedtls_entropy_func returned -%04X\n",
77 (unsigned int) ret );
78 goto cleanup;
79 }
80
81 fwrite( buf, 1, sizeof( buf ), f );
82
83 mbedtls_printf( "Generating %ldkb of data in file '%s'... %04.1f" \
84 "%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
85 fflush( stdout );
86 }
87
88 exit_code = MBEDTLS_EXIT_SUCCESS;
89
90 cleanup:
91 mbedtls_printf( "\n" );
92
93 fclose( f );
94 mbedtls_entropy_free( &entropy );
95
96 mbedtls_exit( exit_code );
97 }
98 #endif /* MBEDTLS_ENTROPY_C */
99