WebCrypto: Add WebKit API structure for keys.

Source/modules/crypto/Key.cpp

Index: Source/modules/crypto/Key.cpp
diff --git a/Source/modules/crypto/Key.cpp b/Source/modules/crypto/Key.cpp
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+++ b/Source/modules/crypto/Key.cpp
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+/*
+ * 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
+ * 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/Key.h"
+
+#include "modules/crypto/Algorithm.h"
+
+namespace WebCore {
+
+namespace {
+
+const char* keyTypeToString(WebKit::WebCryptoKeyType type)
+{
+    switch (type) {
+    case WebKit::WebCryptoKeyTypeSecret:
+        return "secret";
+    case WebKit::WebCryptoKeyTypePublic:
+        return "public";
+    case WebKit::WebCryptoKeyTypePrivate:
+        return "private";
+    }
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+const char* keyUsageToString(WebKit::WebCryptoKeyUsage usage)
+{
+    switch (usage) {
+    case WebKit::WebCryptoKeyUsageEncrypt:
+        return "encrypt";
+    case WebKit::WebCryptoKeyUsageDecrypt:
+        return "decrypt";
+    case WebKit::WebCryptoKeyUsageSign:
+        return "sign";
+    case WebKit::WebCryptoKeyUsageVerify:
+        return "verify";
+    case WebKit::WebCryptoKeyUsageDerive:
+        return "derive";
+    case WebKit::WebCryptoKeyUsageWrap:
+        return "wrap";
+    case WebKit::WebCryptoKeyUsageUnwrap:
+        return "unwrap";
+    case WebKit::EndOfWebCryptoKeyUsage:
+        break;
+    }
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+} // namespace
+
+Key::Key(const WebKit::WebCryptoKey& key)
+    : m_key(key)
+{
+    ScriptWrappable::init(this);
+}
+
+String Key::type() const
+{
+    return ASCIILiteral(keyTypeToString(m_key.type()));
+}
+
+bool Key::extractable() const
+{
+    return m_key.extractable();
+}
+
+Algorithm* Key::algorithm()
+{
+    if (!m_algorithm)
+        m_algorithm = Algorithm::create(m_key.algorithm());
+    return m_algorithm.get();
+}
+
+// FIXME: This creates a new javascript array each time. What should happen
+//        instead is return the same (immutable) array. (Javascript callers can
+//        distinguish this by doing an == test on the arrays and seeing they are
+//        different).
+Vector<String> Key::keyUsage() const
+{
+    Vector<String> result;
+
+    // The WebCryptoKeyUsage values are consecutive powers of 2. Test each one in order.
+    for (int i = 0; (1 << i) < WebKit::EndOfWebCryptoKeyUsage; ++i) {
+        WebKit::WebCryptoKeyUsage usage = static_cast<WebKit::WebCryptoKeyUsage>(1 << i);
+        if (m_key.keyUsage() & usage)
+            result.append(ASCIILiteral(keyUsageToString(usage)));
+    }
+    return result;
+}
+
+} // namespace WebCore