Reject deriveBits() for PBKDF2 when given a length of 0.

components/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 COMPONENTS_WEBCRYPTO_STATUS_H_
 #define COMPONENTS_WEBCRYPTO_STATUS_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 249 matching lines @@
 
   // No length parameter was provided for HKDF's Derive Bits operation.
   static Status ErrorHkdfDeriveBitsLengthNotSpecified();
 
   // The requested bit length for PBKDF2 key derivation was invalid.
   static Status ErrorPbkdf2InvalidLength();
 
   // No length parameter was provided for PBKDF2's Derive Bits operation.
   static Status ErrorPbkdf2DeriveBitsLengthNotSpecified();
 
+  // PBKDF2's deriveBits() was called with an unsupported length of 0.
+  static Status ErrorPbkdf2DeriveBitsLengthZero();
+
   // PBKDF2 was called with iterations == 0.
   static Status ErrorPbkdf2Iterations0();
 
  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
 
 #endif  // COMPONENTS_WEBCRYPTO_STATUS_H_