/*
 * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 * Copyright (C) 2022 Apple Inc. All rights reserved.
 *
 * 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 APPLE 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 <span>
#include <stdint.h>
#include <wtf/ExportMacros.h>

namespace WTF {

template<typename IntegerType> IntegerType cryptographicallyRandomNumber() = delete;

template<> WTF_EXPORT_PRIVATE uint8_t cryptographicallyRandomNumber<uint8_t>();

// Returns a cryptographically secure pseudo-random number in the range [0, UINT_MAX].
template<> WTF_EXPORT_PRIVATE unsigned cryptographicallyRandomNumber<unsigned>();

// Returns a cryptographically secure pseudo-random number in the range [0, UINT64_MAX].
template<> WTF_EXPORT_PRIVATE uint64_t cryptographicallyRandomNumber<uint64_t>();

WTF_EXPORT_PRIVATE void cryptographicallyRandomValues(std::span<uint8_t>);

// Returns a cryptographically secure pseudo-random number in the range [0, 1), with 32 bits of randomness.
WTF_EXPORT_PRIVATE double cryptographicallyRandomUnitInterval();

}

using WTF::cryptographicallyRandomNumber;
using WTF::cryptographicallyRandomUnitInterval;
using WTF::cryptographicallyRandomValues;
