119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/**
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* \brief Use and generate random data into a file via the CTR_DBRG based on AES
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbedtls/build_info.h"
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#include "mbedtls/platform.h"
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#if defined(MBEDTLS_CTR_DRBG_C) && defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_FS_IO)
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <stdio.h>
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#endif
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#if !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_FS_IO)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_CTR_DRBG_C and/or MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
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mbedtls_exit(0);
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}
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#else
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int main(int argc, char *argv[])
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{
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FILE *f;
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int i, k, ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_entropy_context entropy;
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unsigned char buf[1024];
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mbedtls_ctr_drbg_init(&ctr_drbg);
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if (argc < 2) {
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mbedtls_fprintf(stderr, "usage: %s <output filename>\n", argv[0]);
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mbedtls_exit(exit_code);
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}
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if ((f = fopen(argv[1], "wb+")) == NULL) {
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mbedtls_printf("failed to open '%s' for writing.\n", argv[1]);
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mbedtls_exit(exit_code);
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}
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mbedtls_entropy_init(&entropy);
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ret = mbedtls_ctr_drbg_seed(&ctr_drbg,
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mbedtls_entropy_func,
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&entropy,
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(const unsigned char *) "RANDOM_GEN",
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10);
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if (ret != 0) {
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mbedtls_printf("failed in mbedtls_ctr_drbg_seed: %d\n", ret);
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goto cleanup;
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}
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mbedtls_ctr_drbg_set_prediction_resistance(&ctr_drbg, MBEDTLS_CTR_DRBG_PR_OFF);
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#if defined(MBEDTLS_FS_IO)
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ret = mbedtls_ctr_drbg_update_seed_file(&ctr_drbg, "seedfile");
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if (ret == MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR) {
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mbedtls_printf("Failed to open seedfile. Generating one.\n");
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ret = mbedtls_ctr_drbg_write_seed_file(&ctr_drbg, "seedfile");
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if (ret != 0) {
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mbedtls_printf("failed in mbedtls_ctr_drbg_write_seed_file: %d\n", ret);
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goto cleanup;
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}
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} else if (ret != 0) {
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mbedtls_printf("failed in mbedtls_ctr_drbg_update_seed_file: %d\n", ret);
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goto cleanup;
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}
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#endif
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for (i = 0, k = 768; i < k; i++) {
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ret = mbedtls_ctr_drbg_random(&ctr_drbg, buf, sizeof(buf));
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if (ret != 0) {
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mbedtls_printf("failed!\n");
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goto cleanup;
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}
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fwrite(buf, 1, sizeof(buf), f);
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mbedtls_printf("Generating %ldkb of data in file '%s'... %04.1f" \
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"%% done\r",
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(long) (sizeof(buf) * k / 1024),
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argv[1],
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(100 * (float) (i + 1)) / k);
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fflush(stdout);
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}
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exit_code = MBEDTLS_EXIT_SUCCESS;
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cleanup:
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mbedtls_printf("\n");
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fclose(f);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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mbedtls_exit(exit_code);
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}
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#endif /* MBEDTLS_CTR_DRBG_C && MBEDTLS_ENTROPY_C */
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