You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: security.rb
    path of file: ./repos/metasploit-framework/lib/msf/util/windows_registry
    
    the code of the file until where you have to start completion: require 'ruby_smb'

module Msf
module Util
module WindowsRegistry

  #
  # This module include helpers for the S
    
    def nlkm_secret_key(lsa_key)
      _value_type, value_data = get_value('\\Policy\\Secrets\\NL$KM\\CurrVal')
      return nil unless value_data

      if @lsa_vista_style
        nlkm_dec = decrypt_lsa_data(value_data, lsa_key)
      else
        value_data_size = value_data[0, 4].unpack('L<').first
        nlkm_dec = decrypt_secret_data(value_data[(value_data.size - value_data_size)..-1], lsa_key)
      end