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/*
* Copyright (C) 2011 Google Inc.
* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY GOOGLE, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Noncopyable.h>
#include <wtf/StdLibExtras.h>
namespace WTF {
class RandomDevice {
WTF_MAKE_NONCOPYABLE(RandomDevice);
WTF_MAKE_FAST_ALLOCATED;
public:
#if OS(DARWIN) || OS(FUCHSIA) || OS(WINDOWS)
RandomDevice() = default;
#else
RandomDevice();
~RandomDevice();
#endif
// This function attempts to fill buffer with randomness from the operating
// system. Rather than calling this function directly, consider calling
// cryptographicallyRandomNumber or cryptographicallyRandomValues.
void cryptographicallyRandomValues(std::span<uint8_t> buffer);
private:
#if OS(DARWIN) || OS(FUCHSIA) || OS(WINDOWS)
#elif OS(UNIX)
int m_fd { -1 };
#else
#error "This configuration doesn't have a strong source of randomness."
// WARNING: When adding new sources of OS randomness, the randomness must
// be of cryptographic quality!
#endif
};
}
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