[webcrypto] Add decrypt() for AES-CBC.

content/renderer/webcrypto_impl.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_IMPL_H_
 #define CONTENT_RENDERER_WEBCRYPTO_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 
 namespace content {
 
 class CONTENT_EXPORT WebCryptoImpl
     : NON_EXPORTED_BASE(public WebKit::WebCrypto) {
  public:
   WebCryptoImpl();
 
   // Implementation of WebKit::WebCrypto
   virtual void encrypt(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const WebKit::WebCryptoKey& key,
       const unsigned char* data,
       unsigned data_size,
       WebKit::WebCryptoResult result);
+  virtual void decrypt(
+      const WebKit::WebCryptoAlgorithm& algorithm,
+      const WebKit::WebCryptoKey& key,
+      const unsigned char* data,
+      unsigned data_size,
+      WebKit::WebCryptoResult result);
   virtual void digest(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const unsigned char* data,
       unsigned data_size,
       WebKit::WebCryptoResult result);
   virtual void importKey(
       WebKit::WebCryptoKeyFormat format,
       const unsigned char* key_data,
       unsigned key_data_size,
       const WebKit::WebCryptoAlgorithm& algorithm,
@@ skipping 11 matching lines @@
   friend class WebCryptoImplTest;
 
   void Init();
 
   bool EncryptInternal(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const WebKit::WebCryptoKey& key,
       const unsigned char* data,
       unsigned data_size,
       WebKit::WebArrayBuffer* buffer);
+  bool DecryptInternal(
+      const WebKit::WebCryptoAlgorithm& algorithm,
+      const WebKit::WebCryptoKey& key,
+      const unsigned char* data,
+      unsigned data_size,
+      WebKit::WebArrayBuffer* buffer);
   bool DigestInternal(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const unsigned char* data,
       unsigned data_size,
       WebKit::WebArrayBuffer* buffer);
   bool ImportKeyInternal(
       WebKit::WebCryptoKeyFormat format,
       const unsigned char* key_data,
       unsigned key_data_size,
       const WebKit::WebCryptoAlgorithm& algorithm,
       WebKit::WebCryptoKeyUsageMask usage_mask,
       scoped_ptr<WebKit::WebCryptoKeyHandle>* handle,
       WebKit::WebCryptoKeyType* type);
   bool SignInternal(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const WebKit::WebCryptoKey& key,
       const unsigned char* data,
       unsigned data_size,
       WebKit::WebArrayBuffer* buffer);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebCryptoImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEBCRYPTO_IMPL_H_