split_nonce (OpenID::Nonce)

    # File lib/openid/store/nonce.rb, line 26
        def Nonce.split_nonce(nonce_str)
          timestamp_str = nonce_str[0...TIME_STR_LEN]
          raise ArgumentError if timestamp_str.size < TIME_STR_LEN
          raise ArgumentError unless timestamp_str.match(TIME_VALIDATOR)
          ts = Time.parse(timestamp_str).to_i
          raise ArgumentError if ts < 0
          return ts, nonce_str[TIME_STR_LEN..-1]
        end