Add U2F request state machines

device/u2f/u2f_apdu_response.h

 // Copyright 2017 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 DEVICE_U2F_U2F_APDU_RESPONSE_H_
 #define DEVICE_U2F_U2F_APDU_RESPONSE_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 
 namespace device {
 
 // APDU responses are defined as part of ISO 7816-4. Serialized responses
 // consist of a data field of varying length, up to a maximum 65536, and a
 // two byte status field.
 class U2fApduResponse {
  public:
   // Status bytes are specified in ISO 7816-4
   enum class Status : uint16_t {
     SW_NO_ERROR = 0x9000,
     SW_CONDITIONS_NOT_SATISFIED = 0x6985,
     SW_WRONG_DATA = 0x6A80,
+    SW_WRONG_LENGTH = 0x6700,
   };
 
   U2fApduResponse(std::vector<uint8_t> message, Status response_status);
   ~U2fApduResponse();
 
   // Create a APDU response from the serialized message
   static std::unique_ptr<U2fApduResponse> CreateFromMessage(
       const std::vector<uint8_t>& data);
   std::vector<uint8_t> GetEncodedResponse() const;
   const std::vector<uint8_t> data() const { return data_; };
   Status status() const { return response_status_; };
 
  private:
   FRIEND_TEST_ALL_PREFIXES(U2fApduTest, TestDeserializeResponse);
 
   Status response_status_;
   std::vector<uint8_t> data_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_U2F_U2F_APDU_RESPONSE_H_