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diff --git a/Source/WebCore/bindings/js/JSCryptoKeySerializationJWK.h b/Source/WebCore/bindings/js/JSCryptoKeySerializationJWK.h
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+++ b/Source/WebCore/bindings/js/JSCryptoKeySerializationJWK.h
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+/*
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
+ */
+
+#pragma once
+
+#if ENABLE(SUBTLE_CRYPTO)
+
+#include "CryptoKeySerialization.h"
+#include <heap/Strong.h>
+#include <wtf/text/WTFString.h>
+
+namespace JSC {
+class ExecState;
+class JSObject;
+}
+
+namespace WebCore {
+
+class CryptoAlgorithmParametersDeprecated;
+class CryptoKey;
+class CryptoKeyDataRSAComponents;
+
+class JSCryptoKeySerializationJWK final : public CryptoKeySerialization {
+WTF_MAKE_NONCOPYABLE(JSCryptoKeySerializationJWK);
+public:
+    JSCryptoKeySerializationJWK(JSC::ExecState*, const String&);
+    virtual ~JSCryptoKeySerializationJWK();
+
+    static String serialize(JSC::ExecState* exec, const CryptoKey&);
+
+private:
+    std::optional<CryptoAlgorithmPair> reconcileAlgorithm(CryptoAlgorithm*, CryptoAlgorithmParametersDeprecated*) const override;
+
+    void reconcileUsages(CryptoKeyUsageBitmap&) const override;
+    void reconcileExtractable(bool&) const override;
+
+    std::unique_ptr<CryptoKeyData> keyData() const override;
+
+    bool keySizeIsValid(size_t sizeInBits) const;
+    std::unique_ptr<CryptoKeyData> keyDataOctetSequence() const;
+    std::unique_ptr<CryptoKeyData> keyDataRSAComponents() const;
+
+    JSC::ExecState* m_exec;
+    JSC::Strong<JSC::JSObject> m_json;
+
+    mutable String m_jwkAlgorithmName; // Stored when reconcileAlgorithm is called, and used later.
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(SUBTLE_CRYPTO)