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/**
* \brief Generate random data into a file
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include "mbedtls/platform.h"
#if defined(MBEDTLS_HAVEGE_C) && defined(MBEDTLS_FS_IO)
#include "mbedtls/havege.h"
#include <stdio.h>
#include <time.h>
#endif
#if !defined(MBEDTLS_HAVEGE_C) || !defined(MBEDTLS_FS_IO)
int main(void)
{
mbedtls_printf("MBEDTLS_HAVEGE_C not defined.\n");
mbedtls_exit(0);
}
#else
int main(int argc, char *argv[])
{
FILE *f;
time_t t;
int i, k, ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_havege_state hs;
unsigned char buf[1024];
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_havege_init(&hs);
t = time(NULL);
for (i = 0, k = 768; i < k; i++) {
if ((ret = mbedtls_havege_random(&hs, buf, sizeof(buf))) != 0) {
mbedtls_printf(" failed\n ! mbedtls_havege_random returned -0x%04X",
(unsigned int) -ret);
goto exit;
}
fwrite(buf, sizeof(buf), 1, 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);
}
if (t == time(NULL)) {
t--;
}
mbedtls_printf(" \n ");
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_havege_free(&hs);
fclose(f);
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_HAVEGE_C */
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