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diff --git a/Source/JavaScriptCore/wtf/SHA1.h b/Source/JavaScriptCore/wtf/SHA1.h
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+/*
+ * Copyright (C) 2011 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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 WTF_SHA1_h
+#define WTF_SHA1_h
+
+#include <wtf/Vector.h>
+
+namespace WTF {
+
+class SHA1 {
+public:
+    SHA1();
+
+    void addBytes(const Vector<uint8_t>& input)
+    {
+        addBytes(input.data(), input.size());
+    }
+    void addBytes(const uint8_t* input, size_t length);
+
+    // computeHash has a side effect of resetting the state of the object.
+    void computeHash(Vector<uint8_t, 20>&);
+
+private:
+    void finalize();
+    void processBlock();
+    void reset();
+
+    uint8_t m_buffer[64];
+    size_t m_cursor; // Number of bytes filled in m_buffer (0-64).
+    uint64_t m_totalBytes; // Number of bytes added so far.
+    uint32_t m_hash[5];
+};
+
+} // namespace WTF
+
+using WTF::SHA1;
+
+#endif // WTF_SHA1_h