# File lib/hmac.rb, line 62
    def update(text)
      check_status
      # perform inner H
      md = @algorithm.new
      md.update(@key_xor_ipad)
      md.update(text)
      str = md.digest
      # perform outer H
      md = @algorithm.new
      md.update(@key_xor_opad)
      md.update(str)
      @md = md
    end