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diff --git a/Source/WebCore/crypto/CryptoAlgorithmRegistry.h b/Source/WebCore/crypto/CryptoAlgorithmRegistry.h
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+++ b/Source/WebCore/crypto/CryptoAlgorithmRegistry.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
+
+#include "CryptoAlgorithmIdentifier.h"
+#include <wtf/Forward.h>
+#include <wtf/HashMap.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/text/StringHash.h>
+
+#if ENABLE(SUBTLE_CRYPTO)
+
+namespace WebCore {
+
+class CryptoAlgorithm;
+
+class CryptoAlgorithmRegistry {
+    WTF_MAKE_NONCOPYABLE(CryptoAlgorithmRegistry);
+    friend class NeverDestroyed<CryptoAlgorithmRegistry>;
+
+public:
+    static CryptoAlgorithmRegistry& singleton();
+
+    std::optional<CryptoAlgorithmIdentifier> identifier(const String&);
+    String name(CryptoAlgorithmIdentifier);
+
+    RefPtr<CryptoAlgorithm> create(CryptoAlgorithmIdentifier);
+
+private:
+    CryptoAlgorithmRegistry();
+    void platformRegisterAlgorithms();
+
+    using CryptoAlgorithmConstructor = Ref<CryptoAlgorithm> (*)();
+
+    template<typename AlgorithmClass> void registerAlgorithm()
+    {
+        registerAlgorithm(AlgorithmClass::s_name, AlgorithmClass::s_identifier, AlgorithmClass::create);
+    }
+
+    void registerAlgorithm(const String& name, CryptoAlgorithmIdentifier, CryptoAlgorithmConstructor);
+
+    HashMap<String, CryptoAlgorithmIdentifier, ASCIICaseInsensitiveHash> m_identifiers;
+    HashMap<unsigned, std::pair<String, CryptoAlgorithmConstructor>> m_constructors;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(SUBTLE_CRYPTO)