/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 * Copyright (C) 2013 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. 
 * 3.  Neither the name of Google, Inc. ("Google") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY GOOGLE AND ITS CONTRIBUTORS "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 OR ITS 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.
 */


#include "config.h"
#include "Crypto.h"

#include "Document.h"
#include "SubtleCrypto.h"
#include <JavaScriptCore/ArrayBufferView.h>
#include <wtf/CryptographicallyRandomNumber.h>
#include <wtf/UUID.h>

#if OS(DARWIN)
#include <CommonCrypto/CommonCryptor.h>
#include <CommonCrypto/CommonRandom.h>
#endif

namespace WebCore {

Crypto::Crypto(ScriptExecutionContext* context)
    : ContextDestructionObserver(context)
    , m_subtle(SubtleCrypto::create(context))
{
}

Crypto::~Crypto() = default;

ExceptionOr<void> Crypto::getRandomValues(ArrayBufferView& array)
{
    if (!isInt(array.getType()) && !isBigInt(array.getType()))
        return Exception { ExceptionCode::TypeMismatchError };
    if (array.byteLength() > 65536)
        return Exception { ExceptionCode::QuotaExceededError };
#if OS(DARWIN)
    auto rc = CCRandomGenerateBytes(array.baseAddress(), array.byteLength());
    RELEASE_ASSERT(rc == kCCSuccess);
#else
    cryptographicallyRandomValues(array.mutableSpan());
#endif
    return { };
}

String Crypto::randomUUID() const
{
    return createVersion4UUIDString();
}

SubtleCrypto& Crypto::subtle()
{
    return m_subtle;
}

} // namespace WebCore
