module Net::BER::Extensions::Bignum
  ##
  # Converts a Bignum to an uncompressed BER integer.
  def to_ber
    result = []

    # NOTE: Array#pack's 'w' is a BER _compressed_ integer. We need
    # uncompressed BER integers, so we're not using that. See also:
    # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/228864
    n = self
    while n > 0
      b = n & 0xff
      result << b
      n = n >> 8
    end

    "\002" + ([result.size] + result.reverse).pack('C*')
  end
end