Implement HKDF for webcrypto

content/child/webcrypto/status.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_STATUS_H_
 #define CONTENT_CHILD_WEBCRYPTO_STATUS_H_
 
 #include <string>
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
@@ skipping 235 matching lines @@
   // The public key's algorithm was not ECDH.
   static Status ErrorEcdhPublicKeyWrongAlgorithm();
 
   // The public and private keys given to ECDH key derivation were not for the
   // same named curve.
   static Status ErrorEcdhCurveMismatch();
 
   // The requested bit length for ECDH key derivation was too large.
   static Status ErrorEcdhLengthTooBig(unsigned int max_length_bits);
 
+  // The requested length for HKDF was too large.
+  static Status ErrorHkdfLengthTooLong();
+
  private:
   enum Type { TYPE_ERROR, TYPE_SUCCESS };
 
   // Constructs an error with the specified error type and message.
   Status(blink::WebCryptoErrorType error_type,
          const std::string& error_details_utf8);
 
   // Constructs a success or error without any details.
   explicit Status(Type type);
 
   Type type_;
   blink::WebCryptoErrorType error_type_;
   std::string error_details_;
 };
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_STATUS_H_