[webcrypto] Add the KeyAlgorithm interface.

Source/modules/crypto/KeyAlgorithm.h

 /*
  * Copyright (C) 2013 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
@@ skipping 10 matching lines @@
  * 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 Algorithm_h
-#define Algorithm_h
+#ifndef KeyAlgorithm_h
+#define KeyAlgorithm_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "heap/Handle.h"
-#include "public/platform/WebCryptoAlgorithm.h"
+#include "public/platform/WebCryptoKeyAlgorithm.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class Algorithm : public RefCountedWillBeGarbageCollectedFinalized<Algorithm>, public ScriptWrappable {
+class KeyAlgorithm : public RefCountedWillBeGarbageCollectedFinalized<KeyAlgorithm>, public ScriptWrappable {
     DECLARE_GC_INFO;
 public:
-    static PassRefPtrWillBeRawPtr<Algorithm> create(const blink::WebCryptoAlgorithm&);
+    virtual ~KeyAlgorithm();
+
+    static PassRefPtrWillBeRawPtr<KeyAlgorithm> create(const blink::WebCryptoKeyAlgorithm&);
+    static PassRefPtrWillBeRawPtr<KeyAlgorithm> createHash(const blink::WebCryptoAlgorithm&);
 
     String name();
 
-    blink::WebCryptoAlgorithmParamsType type() const { return m_algorithm.paramsType(); }
+    // Needed by SpecialWrapFor and for casting.
+    bool isAesKeyAlgorithm() const;
+    bool isHmacKeyAlgorithm() const;
+    bool isRsaHashedKeyAlgorithm() const;
+    bool isRsaKeyAlgorithm() const;
 
-    void trace(Visitor*) { }
+    virtual void trace(Visitor*);
 
 protected:
-    explicit Algorithm(const blink::WebCryptoAlgorithm&);
+    explicit KeyAlgorithm(const blink::WebCryptoKeyAlgorithm&);
 
-    const blink::WebCryptoAlgorithm m_algorithm;
+    blink::WebCryptoKeyAlgorithm m_algorithm;
 };
 
+#define DEFINE_KEY_ALGORITHM_TYPE_CASTS(thisType) \
+    DEFINE_TYPE_CASTS(thisType, KeyAlgorithm, value, value->is##thisType(), value.is##thisType())
+
 } // namespace WebCore
 
 #endif