mac_length (Net::SSH::Transport::HMAC::Abstract)

        # File lib/net/ssh/transport/hmac/abstract.rb, line 22
    22:       def mac_length(*v)
    23:         @mac_length = nil if !defined?(@mac_length)
    24:         if v.empty?
    25:           @mac_length = superclass.mac_length if @mac_length.nil? && superclass.respond_to?(:mac_length)
    26:           return @mac_length
    27:         elsif v.length == 1
    28:           @mac_length = v.first
    29:         else
    30:           raise ArgumentError, "wrong number of arguments (#{v.length} for 1)"
    31:         end
    32:       end