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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/common/device_random.h>
#include <aws/common/byte_buf.h>
#include <aws/common/thread.h>
#include <Windows.h>
#include <bcrypt.h>
static BCRYPT_ALG_HANDLE s_alg_handle = NULL;
static aws_thread_once s_rand_init = AWS_THREAD_ONCE_STATIC_INIT;
static void s_init_rand(void *user_data) {
(void)user_data;
NTSTATUS status = 0;
status = BCryptOpenAlgorithmProvider(&s_alg_handle, BCRYPT_RNG_ALGORITHM, NULL, 0);
if (!BCRYPT_SUCCESS(status)) {
abort();
}
}
int aws_device_random_buffer(struct aws_byte_buf *output) {
aws_thread_call_once(&s_rand_init, s_init_rand, NULL);
size_t offset = output->capacity - output->len;
NTSTATUS status = BCryptGenRandom(s_alg_handle, output->buffer + output->len, (ULONG)offset, 0);
if (!BCRYPT_SUCCESS(status)) {
return aws_raise_error(AWS_ERROR_RANDOM_GEN_FAILED);
}
output->len += offset;
return AWS_OP_SUCCESS;
}
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