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/**
* \brief Use and generate random data into a file via the CTR_DBRG based on AES
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "mbedtls/build_info.h"
#include "mbedtls/platform.h"
#if defined(MBEDTLS_CTR_DRBG_C) && defined(MBEDTLS_ENTROPY_C) && \
defined(MBEDTLS_FS_IO)
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include <stdio.h>
#endif
#if !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_ENTROPY_C) || \
!defined(MBEDTLS_FS_IO)
int main(void)
{
mbedtls_printf("MBEDTLS_CTR_DRBG_C and/or MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
mbedtls_exit(0);
}
#else
int main(int argc, char *argv[])
{
FILE *f;
int i, k, ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_entropy_context entropy;
unsigned char buf[1024];
mbedtls_ctr_drbg_init(&ctr_drbg);
if (argc < 2) {
mbedtls_fprintf(stderr, "usage: %s <output filename>\n", argv[0]);
mbedtls_exit(exit_code);
}
if ((f = fopen(argv[1], "wb+")) == NULL) {
mbedtls_printf("failed to open '%s' for writing.\n", argv[1]);
mbedtls_exit(exit_code);
}
mbedtls_entropy_init(&entropy);
ret = mbedtls_ctr_drbg_seed(&ctr_drbg,
mbedtls_entropy_func,
&entropy,
(const unsigned char *) "RANDOM_GEN",
10);
if (ret != 0) {
mbedtls_printf("failed in mbedtls_ctr_drbg_seed: %d\n", ret);
goto cleanup;
}
mbedtls_ctr_drbg_set_prediction_resistance(&ctr_drbg, MBEDTLS_CTR_DRBG_PR_OFF);
#if defined(MBEDTLS_FS_IO)
ret = mbedtls_ctr_drbg_update_seed_file(&ctr_drbg, "seedfile");
if (ret == MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR) {
mbedtls_printf("Failed to open seedfile. Generating one.\n");
ret = mbedtls_ctr_drbg_write_seed_file(&ctr_drbg, "seedfile");
if (ret != 0) {
mbedtls_printf("failed in mbedtls_ctr_drbg_write_seed_file: %d\n", ret);
goto cleanup;
}
} else if (ret != 0) {
mbedtls_printf("failed in mbedtls_ctr_drbg_update_seed_file: %d\n", ret);
goto cleanup;
}
#endif
for (i = 0, k = 768; i < k; i++) {
ret = mbedtls_ctr_drbg_random(&ctr_drbg, buf, sizeof(buf));
if (ret != 0) {
mbedtls_printf("failed!\n");
goto cleanup;
}
fwrite(buf, 1, sizeof(buf), f);
mbedtls_printf("Generating %ldkb of data in file '%s'... %04.1f" \
"%% done\r",
(long) (sizeof(buf) * k / 1024),
argv[1],
(100 * (float) (i + 1)) / k);
fflush(stdout);
}
exit_code = MBEDTLS_EXIT_SUCCESS;
cleanup:
mbedtls_printf("\n");
fclose(f);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_CTR_DRBG_C && MBEDTLS_ENTROPY_C */
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