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 #include "mbedtls/platform.h"
23
24 #if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO)
25 #include "mbedtls/entropy.h"
26
27 #include <stdio.h>
28 #endif
29
30 #if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO)
main(void)31 int main(void)
32 {
33 mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
34 mbedtls_exit(0);
35 }
36 #else
37
38
main(int argc,char * argv[])39 int main(int argc, char *argv[])
40 {
41 FILE *f;
42 int i, k, ret = 1;
43 int exit_code = MBEDTLS_EXIT_FAILURE;
44 mbedtls_entropy_context entropy;
45 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
46
47 if (argc < 2) {
48 mbedtls_fprintf(stderr, "usage: %s <output filename>\n", argv[0]);
49 mbedtls_exit(exit_code);
50 }
51
52 if ((f = fopen(argv[1], "wb+")) == NULL) {
53 mbedtls_printf("failed to open '%s' for writing.\n", argv[1]);
54 mbedtls_exit(exit_code);
55 }
56
57 mbedtls_entropy_init(&entropy);
58
59 for (i = 0, k = 768; i < k; i++) {
60 ret = mbedtls_entropy_func(&entropy, buf, sizeof(buf));
61 if (ret != 0) {
62 mbedtls_printf(" failed\n ! mbedtls_entropy_func returned -%04X\n",
63 (unsigned int) ret);
64 goto cleanup;
65 }
66
67 fwrite(buf, 1, sizeof(buf), f);
68
69 mbedtls_printf("Generating %ldkb of data in file '%s'... %04.1f" \
70 "%% done\r",
71 (long) (sizeof(buf) * k / 1024),
72 argv[1],
73 (100 * (float) (i + 1)) / k);
74 fflush(stdout);
75 }
76
77 exit_code = MBEDTLS_EXIT_SUCCESS;
78
79 cleanup:
80 mbedtls_printf("\n");
81
82 fclose(f);
83 mbedtls_entropy_free(&entropy);
84
85 mbedtls_exit(exit_code);
86 }
87 #endif /* MBEDTLS_ENTROPY_C */
88