ruby version of the script to 'decode ibm stash file's - http://goo.gl/6wbXzI

unstash.rb

#!/bin/env ruby

abort("usage: #{$0} stash_file\nuse to descrypt IBM HTTP server stash files") if (ARGV.length < 1)

password = ''
File.open(ARGV[0], 'r') do |fh|
  password = fh.read(1024)
end

decoded = password.unpack("C*").map {|c| c^0xf5}
puts decoded[0, decoded.index(0)].collect {|i| i.chr}.join