[webcrypto] Add the KeyAlgorithm interface.

Source/modules/crypto/HmacKeyAlgorithm.cpp

 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2014 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.
  */
 
 #include "config.h"
-#include "modules/crypto/Algorithm.h"
+#include "modules/crypto/HmacKeyAlgorithm.h"
 
 #include "modules/crypto/NormalizeAlgorithm.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-DEFINE_GC_INFO(Algorithm);
-
-PassRefPtrWillBeRawPtr<Algorithm> Algorithm::create(const blink::WebCryptoAlgorithm& algorithm)
+PassRefPtrWillBeRawPtr<HmacKeyAlgorithm> HmacKeyAlgorithm::create(const blink::WebCryptoKeyAlgorithm& algorithm)
 {
-    return adoptRefWillBeNoop(new Algorithm(algorithm));
+    return adoptRefWillBeNoop(new HmacKeyAlgorithm(algorithm));
 }
 
-Algorithm::Algorithm(const blink::WebCryptoAlgorithm& algorithm)
-    : m_algorithm(algorithm)
+KeyAlgorithm* HmacKeyAlgorithm::hash()
+{
+    if (!m_hash)
+        m_hash = KeyAlgorithm::createHash(m_algorithm.hmacParams()->hash());
+    return m_hash.get();
+}
+
+void HmacKeyAlgorithm::trace(Visitor* visitor)
+{
+    KeyAlgorithm::trace(visitor);
+    visitor->trace(m_hash);
+}
+
+HmacKeyAlgorithm::HmacKeyAlgorithm(const blink::WebCryptoKeyAlgorithm& algorithm)
+    : KeyAlgorithm(algorithm)
 {
     ScriptWrappable::init(this);
 }
 
-String Algorithm::name()
-{
-    return algorithmIdToName(m_algorithm.id());
-}
-
 } // namespace WebCore