[webcrypto] Add the KeyAlgorithm interface.

Source/modules/crypto/KeyAlgorithm.cpp

Index: Source/modules/crypto/KeyAlgorithm.cpp
diff --git a/Source/modules/crypto/KeyAlgorithm.cpp b/Source/modules/crypto/KeyAlgorithm.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9227a306eac98f7467f86d2c1cc7aa01bd6b88a7
--- /dev/null
+++ b/Source/modules/crypto/KeyAlgorithm.cpp
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+/*
+ * 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/KeyAlgorithm.h"
+
+#include "modules/crypto/AesKeyAlgorithm.h"
+#include "modules/crypto/HmacKeyAlgorithm.h"
+#include "modules/crypto/NormalizeAlgorithm.h"
+#include "modules/crypto/RsaHashedKeyAlgorithm.h"
+#include "modules/crypto/RsaKeyAlgorithm.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+KeyAlgorithm::~KeyAlgorithm()
+{
+}
+
+PassRefPtrWillBeRawPtr<KeyAlgorithm> KeyAlgorithm::create(const blink::WebCryptoKeyAlgorithm& algorithm)
+{
+    switch (algorithm.paramsType()) {
+    case blink::WebCryptoKeyAlgorithmParamsTypeNone:
+        return adoptRefWillBeNoop(new KeyAlgorithm(algorithm));
+    case blink::WebCryptoKeyAlgorithmParamsTypeAes:
+        return AesKeyAlgorithm::create(algorithm);
+    case blink::WebCryptoKeyAlgorithmParamsTypeHmac:
+        return HmacKeyAlgorithm::create(algorithm);
+    case blink::WebCryptoKeyAlgorithmParamsTypeRsa:
+        return RsaKeyAlgorithm::create(algorithm);
+    case blink::WebCryptoKeyAlgorithmParamsTypeRsaHashed:
+        return RsaHashedKeyAlgorithm::create(algorithm);
+    }
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+
+PassRefPtrWillBeRawPtr<KeyAlgorithm> KeyAlgorithm::createHash(const blink::WebCryptoAlgorithm& hash)
+{
+    // Assume that none of the hash algorithms have any parameters.
+    ASSERT(hash.paramsType() == blink::WebCryptoAlgorithmParamsTypeNone);
+    return adoptRefWillBeNoop(new KeyAlgorithm(blink::WebCryptoKeyAlgorithm(hash.id(), nullptr)));
+}
+
+KeyAlgorithm::KeyAlgorithm(const blink::WebCryptoKeyAlgorithm& algorithm)
+    : m_algorithm(algorithm)
+{
+    ScriptWrappable::init(this);
+}
+
+String KeyAlgorithm::name()
+{
+    return algorithmIdToName(m_algorithm.id());
+}
+
+bool KeyAlgorithm::isAesKeyAlgorithm() const
+{
+    return m_algorithm.paramsType() == blink::WebCryptoKeyAlgorithmParamsTypeAes;
+}
+
+bool KeyAlgorithm::isHmacKeyAlgorithm() const
+{
+    return m_algorithm.paramsType() == blink::WebCryptoKeyAlgorithmParamsTypeHmac;
+}
+
+bool KeyAlgorithm::isRsaHashedKeyAlgorithm() const
+{
+    return m_algorithm.paramsType() == blink::WebCryptoKeyAlgorithmParamsTypeRsaHashed;
+}
+
+bool KeyAlgorithm::isRsaKeyAlgorithm() const
+{
+    return m_algorithm.paramsType() == blink::WebCryptoKeyAlgorithmParamsTypeRsa;
+}
+
+void KeyAlgorithm::trace(Visitor*)
+{
+}
+
+} // namespace WebCore