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34 lines
881 B
C++
34 lines
881 B
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/rand_util.h"
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#include <zircon/syscalls.h>
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#include <algorithm>
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#include "base/logging.h"
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namespace base {
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void RandBytes(void* output, size_t output_length) {
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size_t remaining = output_length;
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unsigned char* cur = reinterpret_cast<unsigned char*>(output);
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while (remaining > 0) {
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// The syscall has a maximum number of bytes that can be read at once.
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size_t read_len =
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std::min(remaining, static_cast<size_t>(ZX_CPRNG_DRAW_MAX_LEN));
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size_t actual;
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zx_status_t status = zx_cprng_draw(cur, read_len, &actual);
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CHECK(status == ZX_OK && read_len == actual);
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CHECK(remaining >= actual);
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remaining -= actual;
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cur += actual;
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}
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}
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} // namespace base
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