jal.rb

require 'digest/md5'
hash = "4b364677946ccf79f841114e73ccaf4f"
salt = "hoge$"

0.upto(999999) { |num|
  pass = num.to_s
  # pass = "0" * (6 - pass.size) + pass
  pass = ("00000" + pass).slice(-6, 6)
  md5 = Digest::MD5.hexdigest(salt + pass)
  if hash == md5
    puts "Solved: #{pass}"
  end
}