blob: 2564745441e25df3c683b2b69b5a5dfb00175e51 [file] [log] [blame]
// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <errno.h>
#include <sys/random.h>
#include <zircon/syscalls.h>
ssize_t getrandom(void* buffer, size_t buffer_size, unsigned int flags) {
// The |flags| argument is only validated for valid bits and is otherwise
// ignored. The implementation uses zx_cprng_draw, which does not block
// (GRND_NONBLOCK is not required), and supplies random data suited for
// cryptographic operations (GRND_RANDOM is not required).
if (flags & ~(GRND_NONBLOCK | GRND_RANDOM)) {
errno = EINVAL;
return -1;
zx_cprng_draw(buffer, buffer_size);
return buffer_size;