[webcrypto] Add symmetric key export for NSS and OpenSSL.

content/renderer/webcrypto/webcrypto_util.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_WEBCRYPTO_WEBCRYPTO_UTIL_H_
 #define CONTENT_RENDERER_WEBCRYPTO_WEBCRYPTO_UTIL_H_
 
 #include <map>
 #include <string>
 #include <vector>
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebArrayBuffer.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
 
 namespace content {
 
 namespace webcrypto {
 
 // Returns a pointer to the start of |data|, or NULL if it is empty. This is a
 // convenience function for getting the pointer, and should not be used beyond
 // the expected lifetime of |data|.
 CONTENT_EXPORT const uint8* Uint8VectorStart(const std::vector<uint8>& data);
 
 // Shrinks a WebArrayBuffer to a new size.
 // TODO(eroman): This works by re-allocating a new buffer. It would be better if
 //               the WebArrayBuffer could just be truncated instead.
 void ShrinkBuffer(blink::WebArrayBuffer* buffer, unsigned new_size);
 
+// Creates a WebArrayBuffer from a uint8 byte array
+blink::WebArrayBuffer CreateArrayBuffer(const uint8* data, unsigned data_size);
+
 // This function decodes unpadded 'base64url' encoded data, as described in
 // RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5.
 // In Web Crypto, this type of encoding is only used inside JWK.
 bool Base64DecodeUrlSafe(const std::string& input, std::string* output);
 
 // Returns the "hash" param for an algorithm if it exists, otherwise returns
 // a null algorithm.
 blink::WebCryptoAlgorithm GetInnerHashAlgorithm(
     const blink::WebCryptoAlgorithm& algorithm);
 
@@ skipping 55 matching lines @@
 // Creates an AES-GCM algorithm whose parameters struct is compatible with key
 // generation.
 blink::WebCryptoAlgorithm CreateAesGcmKeyGenAlgorithm(
     unsigned short key_length_bits);
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEBCRYPTO_WEBCRYPTO_UTIL_H_