otp-md5

#!/usr/bin/ruby
require 'otp' # gem install ruby-otp

def OTP.md5(sequence, seed, password=nil)
  if password == nil
    begin
      print "password: "
      system 'stty -echo -icanon'
      password = $stdin.gets
      password.chomp! if password
    ensure
      system 'stty echo icanon'
      print "\r"
    end  
  end

  if password.size < 10
    joined = seed + password
    password = joined[-10..-1]
    seed = joined[0...-10]
  end

  OTP.new(sequence.to_i, seed, password, 'md5')
end

if __FILE__ == $0
  puts OTP.md5(*ARGV[0..1])
end