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

content/renderer/webcrypto/webcrypto_util.cc

 // Copyright 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.
 
 #include "content/renderer/webcrypto/webcrypto_util.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
@@ skipping 32 matching lines @@
 
   if (new_size == buffer->byteLength())
     return;
 
   blink::WebArrayBuffer new_buffer = blink::WebArrayBuffer::create(new_size, 1);
   DCHECK(!new_buffer.isNull());
   memcpy(new_buffer.data(), buffer->data(), new_size);
   *buffer = new_buffer;
 }
 
+blink::WebArrayBuffer CreateArrayBuffer(const uint8* data, unsigned data_size) {
+  blink::WebArrayBuffer buffer = blink::WebArrayBuffer::create(data_size, 1);
+  DCHECK(!buffer.isNull());
+  if (data_size)  // data_size == 0 might mean the data pointer is invalid
+    memcpy(buffer.data(), data, data_size);
+  return buffer;
+}
+
 // This function decodes unpadded 'base64url' encoded data, as described in
 // RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5. To do this, first
 // change the incoming data to 'base64' encoding by applying the appropriate
 // transformation including adding padding if required, and then call a base64
 // decoder.
 bool Base64DecodeUrlSafe(const std::string& input, std::string* output) {
   std::string base64EncodedText(input);
   std::replace(base64EncodedText.begin(), base64EncodedText.end(), '-', '+');
   std::replace(base64EncodedText.begin(), base64EncodedText.end(), '_', '/');
   base64EncodedText.append((4 - base64EncodedText.size() % 4) % 4, '=');
@@ skipping 125 matching lines @@
 
 blink::WebCryptoAlgorithm CreateAesGcmKeyGenAlgorithm(
     unsigned short key_length_bits) {
   return CreateAesKeyGenAlgorithm(blink::WebCryptoAlgorithmIdAesGcm,
                                   key_length_bits);
 }
 
 }  // namespace webcrypto
 
 }  // namespace content