Implement PBKDF2 (except for generateKey) using BoringSSL

content/child/webcrypto/crypto_data.h

 // Copyright 2014 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_CHILD_WEBCRYPTO_CRYPTO_DATA_H_
 #define CONTENT_CHILD_WEBCRYPTO_CRYPTO_DATA_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 18 matching lines @@
   CryptoData(const unsigned char* bytes, unsigned int byte_length);
 
   // These constructors do NOT copy the data. Hence the base pointer should
   // remain valid for the lifetime of CryptoData.
   explicit CryptoData(const std::vector<unsigned char>& bytes);
   explicit CryptoData(const std::string& bytes);
   explicit CryptoData(const blink::WebVector<unsigned char>& bytes);
 
   const unsigned char* bytes() const { return bytes_; }
   unsigned int byte_length() const { return byte_length_; }
+  bool is_empty() const { return bytes_ == NULL || byte_length_ == 0; }
 
  private:
   const unsigned char* const bytes_;
   const unsigned int byte_length_;
 };
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_CRYPTO_DATA_H_