Add digestSynchronous WebCrypto method.

public/platform/WebCrypto.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 160 matching lines @@
     virtual void verifySignature(const WebCryptoAlgorithm&, const WebCryptoKey&, const unsigned char* signature, unsigned signatureSize, const unsigned char* data, unsigned dataSize, WebCryptoResult result) { result.completeWithError(); }
     virtual void digest(const WebCryptoAlgorithm&, const unsigned char* data, unsigned dataSize, WebCryptoResult result) { result.completeWithError(); }
     virtual void generateKey(const WebCryptoAlgorithm&, bool extractable, WebCryptoKeyUsageMask, WebCryptoResult result) { result.completeWithError(); }
     // It is possible for the WebCryptoAlgorithm to be "isNull()"
     virtual void importKey(WebCryptoKeyFormat, const unsigned char* keyData, unsigned keyDataSize, const WebCryptoAlgorithm&, bool extractable, WebCryptoKeyUsageMask, WebCryptoResult result) { result.completeWithError(); }
     virtual void exportKey(WebCryptoKeyFormat, const WebCryptoKey&, WebCryptoResult result) { result.completeWithError(); }
     virtual void wrapKey(WebCryptoKeyFormat, const WebCryptoKey& key, const WebCryptoKey& wrappingKey, const WebCryptoAlgorithm&, WebCryptoResult result) { result.completeWithError(); }
     // It is possible that unwrappedKeyAlgorithm.isNull()
     virtual void unwrapKey(WebCryptoKeyFormat, const unsigned char* wrappedKey, unsigned wrappedKeySize, const WebCryptoKey&, const WebCryptoAlgorithm& unwrapAlgorithm, const WebCryptoAlgorithm& unwrappedKeyAlgorithm, bool extractable, WebCryptoKeyUsageMask, WebCryptoResult result) { result.completeWithError(); }
 
+    // This is the one exception to the "Completing the request" guarantees
+    // outlined above. digestSynchronous must provide the result into result
+    // synchronously. It must return |true| on successful calculation of the
+    // digest and |false| otherwise. This is useful for Blink internal crypto
+    // and is not part of the WebCrypto standard.
+    virtual bool digestSynchronous(const WebCryptoAlgorithm&, const unsigned char* data, unsigned dataSize, WebArrayBuffer& result) { return false; }

[eroman, 2014/02/08 01:40:22]

* Pass a WebCryptoAlgorithmId instead (since none of the supported digests have
any parameters, and constructing WebCryptoAlgorithm is clumsy

* I think WebVector would be a more appropriate output type.

[jww, 2014/02/08 02:31:18]

Done.
I'm happy to do this if you think it's best, but given that it's a
WebArrayBuffer everywhere else, it seems a bit inconsistent to start using
WebVectors here (and it's a simple conversion to WebVector for the consumer if
they choose to use it). Let me know either way.

+
 protected:
     virtual ~WebCrypto() { }
 };
 
 } // namespace blink
 
 #endif