[webcrypto] Add crypto.subtle.wrapKey() and crypto.subtle.unwrapKey()

Source/modules/crypto/Key.cpp

 /*
  * 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 171 matching lines @@
         return false;
     }
 
     if (m_key.algorithm().id() != algorithm.id()) {
         exceptionState.throwDOMException(NotSupportedError, "key.algorithm does not match that of operation");
         return false;
     }
 
     // Verify that the algorithm-specific parameters for the key conform to the
     // algorithm.
+    // FIXME: Verify that this is complete.
 
     if (m_key.algorithm().id() == blink::WebCryptoAlgorithmIdHmac) {
         blink::WebCryptoAlgorithmId keyHash;
         blink::WebCryptoAlgorithmId algorithmHash;
         if (!getHmacHashId(m_key.algorithm(), keyHash) || !getHmacHashId(algorithm, algorithmHash) || keyHash != algorithmHash) {
             exceptionState.throwDOMException(NotSupportedError, "key.algorithm does not match that of operation (HMAC's hash differs)");
             return false;
         }
     }
 
@@ skipping 32 matching lines @@
         if (!usage) {
             exceptionState.throwTypeError("Invalid keyUsages argument");
             return false;
         }
         mask |= usage;
     }
     return true;
 }
 
 } // namespace WebCore