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diff --git a/src/bun.js/bindings/webcrypto/CryptoAlgorithmHkdfParams.h b/src/bun.js/bindings/webcrypto/CryptoAlgorithmHkdfParams.h
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+/*
+ * Copyright (C) 2017 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
+
+#include "BufferSource.h"
+#include "CryptoAlgorithmParameters.h"
+#include <JavaScriptCore/JSObject.h>
+#include <JavaScriptCore/Strong.h>
+#include <wtf/Vector.h>
+
+#if ENABLE(WEB_CRYPTO)
+
+namespace WebCore {
+
+class CryptoAlgorithmHkdfParams final : public CryptoAlgorithmParameters {
+public:
+    // FIXME: Consider merging hash and hashIdentifier.
+    std::variant<JSC::Strong<JSC::JSObject>, String> hash;
+    CryptoAlgorithmIdentifier hashIdentifier;
+    BufferSource salt;
+    BufferSource info;
+
+    const Vector<uint8_t>& saltVector() const
+    {
+        if (!m_saltVector.isEmpty() || !salt.length())
+            return m_saltVector;
+
+        m_saltVector.append(salt.data(), salt.length());
+        return m_saltVector;
+    }
+
+    const Vector<uint8_t>& infoVector() const
+    {
+        if (!m_infoVector.isEmpty() || !info.length())
+            return m_infoVector;
+
+        m_infoVector.append(info.data(), info.length());
+        return m_infoVector;
+    }
+
+    Class parametersClass() const final { return Class::HkdfParams; }
+
+    CryptoAlgorithmHkdfParams isolatedCopy() const
+    {
+        CryptoAlgorithmHkdfParams result;
+        result.identifier = identifier;
+        result.m_saltVector = saltVector();
+        result.m_infoVector = infoVector();
+        result.hashIdentifier = hashIdentifier;
+
+        return result;
+    }
+
+private:
+    mutable Vector<uint8_t> m_saltVector;
+    mutable Vector<uint8_t> m_infoVector;
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_CRYPTO_ALGORITHM_PARAMETERS(HkdfParams)
+
+#endif // ENABLE(WEB_CRYPTO)