[webcrypto] Add the KeyAlgorithm interface.

public/platform/WebCryptoKeyAlgorithmParams.h

+/*
+ * 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.
+ */
+
+#ifndef WebCryptoKeyAlgorithmParams_h
+#define WebCryptoKeyAlgorithmParams_h
+
+#include "WebCommon.h"
+#include "WebCryptoAlgorithm.h"
+#include "WebVector.h"
+
+namespace blink {
+
+enum WebCryptoKeyAlgorithmParamsType {
+    WebCryptoKeyAlgorithmParamsTypeNone,
+    WebCryptoKeyAlgorithmParamsTypeHmac,
+    WebCryptoKeyAlgorithmParamsTypeAes,
+    WebCryptoKeyAlgorithmParamsTypeRsa,
+    WebCryptoKeyAlgorithmParamsTypeRsaHashed
+};
+
+class WebCryptoKeyAlgorithmParams {
+public:
+    virtual ~WebCryptoKeyAlgorithmParams() { }
+    virtual WebCryptoKeyAlgorithmParamsType type() const
+    {
+        return WebCryptoKeyAlgorithmParamsTypeNone;
+    }
+};
+
+class WebCryptoAesKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
+public:
+    explicit WebCryptoAesKeyAlgorithmParams(unsigned short lengthBits)
+        : m_lengthBits(lengthBits)
+    {
+    }
+
+    unsigned short lengthBits() const
+    {
+        return m_lengthBits;
+    }
+
+    virtual WebCryptoKeyAlgorithmParamsType type() const
+    {
+        return WebCryptoKeyAlgorithmParamsTypeAes;
+    }
+
+private:
+    unsigned short m_lengthBits;
+};
+
+class WebCryptoHmacKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
+public:
+    explicit WebCryptoHmacKeyAlgorithmParams(const WebCryptoAlgorithm& hash)
+        : m_hash(hash)
+    {
+    }
+
+    const WebCryptoAlgorithm& hash() const
+    {
+        return m_hash;
+    }
+
+    virtual WebCryptoKeyAlgorithmParamsType type() const
+    {
+        return WebCryptoKeyAlgorithmParamsTypeHmac;
+    }
+
+private:
+    WebCryptoAlgorithm m_hash;
+};
+
+class WebCryptoRsaKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
+public:
+    WebCryptoRsaKeyAlgorithmParams(unsigned modulusLengthBits, const unsigned char* publicExponent, unsigned publicExponentSize)
+        : m_modulusLengthBits(modulusLengthBits)
+        , m_publicExponent(publicExponent, publicExponentSize)
+    {
+    }
+
+    unsigned modulusLengthBits() const
+    {
+        return m_modulusLengthBits;
+    }
+
+    const WebVector<unsigned char>& publicExponent() const
+    {
+        return m_publicExponent;
+    }
+
+    virtual WebCryptoKeyAlgorithmParamsType type() const
+    {
+        return WebCryptoKeyAlgorithmParamsTypeRsa;
+    }
+
+private:
+    unsigned m_modulusLengthBits;
+    WebVector<unsigned char> m_publicExponent;
+};
+
+class WebCryptoRsaHashedKeyAlgorithmParams : public WebCryptoRsaKeyAlgorithmParams {
+public:
+    WebCryptoRsaHashedKeyAlgorithmParams(unsigned modulusLengthBits, const unsigned char* publicExponent, unsigned publicExponentSize, const WebCryptoAlgorithm& hash)
+        : WebCryptoRsaKeyAlgorithmParams(modulusLengthBits, publicExponent, publicExponentSize)
+        , m_hash(hash)
+    {
+    }
+
+    const WebCryptoAlgorithm& hash() const
+    {
+        return m_hash;
+    }
+
+    virtual WebCryptoKeyAlgorithmParamsType type() const
+    {
+        return WebCryptoKeyAlgorithmParamsTypeRsaHashed;
+    }
+
+private:
+    WebCryptoAlgorithm m_hash;
+};
+
+} // namespace blink
+
+#endif