class Comet::U2FSignResponse

def to_hash
  ret = {}
  ret['ChallengeID'] = @challenge_id
  ret['KeyHandle'] = @key_handle
  ret['Signature'] = @signature
  ret['ClientData'] = @client_data
  @unknown_json_fields.each do |k, v|
    ret[k] = v
  end
  ret
end