Source/WebCore/crypto/algorithms/CryptoAlgorithmHKDF.cpp

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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#include "config.h"
#include "CryptoAlgorithmHKDF.h"

#if ENABLE(WEB_CRYPTO)

#include "CryptoAlgorithmHkdfParams.h"
#include "CryptoKeyRaw.h"
#include <JavaScriptCore/JSCJSValueInlines.h>
#include <wtf/CrossThreadCopier.h>

namespace WebCore {

Ref<CryptoAlgorithm> CryptoAlgorithmHKDF::create()
{
    return adoptRef(*new CryptoAlgorithmHKDF);
}

CryptoAlgorithmIdentifier CryptoAlgorithmHKDF::identifier() const
{
    return s_identifier;
}

void CryptoAlgorithmHKDF::deriveBits(const CryptoAlgorithmParameters& parameters, Ref<CryptoKey>&& baseKey, size_t length, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
    if (!length || length % 8) {
        exceptionCallback(OperationError);
        return;
    }

    dispatchOperationInWorkQueue(workQueue, context, WTFMove(callback), WTFMove(exceptionCallback),
        [parameters = crossThreadCopy(downcast<CryptoAlgorithmHkdfParams>(parameters)), baseKey = WTFMove(baseKey), length] {
            return platformDeriveBits(parameters, downcast<CryptoKeyRaw>(baseKey.get()), length);
        });
}

void CryptoAlgorithmHKDF::importKey(CryptoKeyFormat format, KeyData&& data, const CryptoAlgorithmParameters& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyCallback&& callback, ExceptionCallback&& exceptionCallback)
{
    if (format != CryptoKeyFormat::Raw) {
        exceptionCallback(NotSupportedError);
        return;
    }
    if (usages & (CryptoKeyUsageEncrypt | CryptoKeyUsageDecrypt | CryptoKeyUsageSign | CryptoKeyUsageVerify | CryptoKeyUsageWrapKey | CryptoKeyUsageUnwrapKey)) {
        exceptionCallback(SyntaxError);
        return;
    }
    if (extractable) {
        exceptionCallback(SyntaxError);
        return;
    }

    callback(CryptoKeyRaw::create(parameters.identifier, WTFMove(WTF::get<Vector<uint8_t>>(data)), usages));
}

ExceptionOr<size_t> CryptoAlgorithmHKDF::getKeyLength(const CryptoAlgorithmParameters&)
{
    return 0;
}
    
} // namespace WebCore

#endif // ENABLE(WEB_CRYPTO)