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diff --git a/Source/WebCore/page/csp/ContentSecurityPolicyHash.h b/Source/WebCore/page/csp/ContentSecurityPolicyHash.h
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+++ b/Source/WebCore/page/csp/ContentSecurityPolicyHash.h
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+/*
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef ContentSecurityPolicyHash_h
+#define ContentSecurityPolicyHash_h
+
+#include <wtf/HashTraits.h>
+#include <wtf/Hasher.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+// Keep this synchronized with the constant maximumContentSecurityPolicyDigestLength below.
+enum class ContentSecurityPolicyHashAlgorithm {
+    SHA_256 = 1 << 0,
+    SHA_384 = 1 << 1,
+    SHA_512 = 1 << 2,
+};
+
+const size_t maximumContentSecurityPolicyDigestLength = 64; // bytes to hold SHA-512 digest
+
+typedef Vector<uint8_t> ContentSecurityPolicyDigest;
+typedef std::pair<ContentSecurityPolicyHashAlgorithm, ContentSecurityPolicyDigest> ContentSecurityPolicyHash;
+
+}
+
+namespace WTF {
+
+template<> struct DefaultHash<WebCore::ContentSecurityPolicyHashAlgorithm> { typedef IntHash<WebCore::ContentSecurityPolicyHashAlgorithm> Hash; };
+template<> struct HashTraits<WebCore::ContentSecurityPolicyHashAlgorithm> : StrongEnumHashTraits<WebCore::ContentSecurityPolicyHashAlgorithm> { };
+template<> struct DefaultHash<WebCore::ContentSecurityPolicyDigest> {
+    struct Hash {
+        static unsigned hash(const WebCore::ContentSecurityPolicyDigest& digest)
+        {
+            return StringHasher::computeHashAndMaskTop8Bits(digest.data(), digest.size());
+        }
+        static bool equal(const WebCore::ContentSecurityPolicyDigest& a, const WebCore::ContentSecurityPolicyDigest& b)
+        {
+            return a == b;
+        }
+        static const bool safeToCompareToEmptyOrDeleted = true;
+    };
+};
+
+}
+
+#endif // ContentSecurityPolicyHash_h