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 OR GPL-2.0-or-later
6 */
7
8 #include "mbedtls/build_info.h"
9
10 #include "mbedtls/platform.h"
11
12 #if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO)
13 #include "mbedtls/entropy.h"
14
15 #include <stdio.h>
16 #endif
17
18 #if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO)
main(void)19 int main(void)
20 {
21 mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
22 mbedtls_exit(0);
23 }
24 #else
25
26
main(int argc,char * argv[])27 int main(int argc, char *argv[])
28 {
29 FILE *f;
30 int i, k, ret = 1;
31 int exit_code = MBEDTLS_EXIT_FAILURE;
32 mbedtls_entropy_context entropy;
33 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
34
35 if (argc < 2) {
36 mbedtls_fprintf(stderr, "usage: %s <output filename>\n", argv[0]);
37 mbedtls_exit(exit_code);
38 }
39
40 if ((f = fopen(argv[1], "wb+")) == NULL) {
41 mbedtls_printf("failed to open '%s' for writing.\n", argv[1]);
42 mbedtls_exit(exit_code);
43 }
44
45 mbedtls_entropy_init(&entropy);
46
47 for (i = 0, k = 768; i < k; i++) {
48 ret = mbedtls_entropy_func(&entropy, buf, sizeof(buf));
49 if (ret != 0) {
50 mbedtls_printf(" failed\n ! mbedtls_entropy_func returned -%04X\n",
51 (unsigned int) ret);
52 goto cleanup;
53 }
54
55 fwrite(buf, 1, sizeof(buf), f);
56
57 mbedtls_printf("Generating %ldkb of data in file '%s'... %04.1f" \
58 "%% done\r",
59 (long) (sizeof(buf) * k / 1024),
60 argv[1],
61 (100 * (float) (i + 1)) / k);
62 fflush(stdout);
63 }
64
65 exit_code = MBEDTLS_EXIT_SUCCESS;
66
67 cleanup:
68 mbedtls_printf("\n");
69
70 fclose(f);
71 mbedtls_entropy_free(&entropy);
72
73 mbedtls_exit(exit_code);
74 }
75 #endif /* MBEDTLS_ENTROPY_C */
76
