decrypt.rb

#!/usr/bin/env ruby
require 'openssl'
require 'tempfile'

# How to use:
# cd assets/data
# find . -type f -print0 | xargs -L1 -0 ./decrypt.rb

input_path = ARGV[0]

cipher = OpenSSL::Cipher::AES256.new(:CBC)
cipher.key = "USCaPQpA4TSNVxMI1v9SK9UC0yZuAnb2"
out = ""
begin
  out = cipher.update(File.read(input_path)) + cipher.final
rescue OpenSSL::Cipher::CipherError
end

if out[0..3] == "7z\xBC\xAF"
  file_7z = Tempfile.new('rv')
  begin
    file_7z.print out
    file_7z.flush
    decompressed_data = `7z e -so #{file_7z.path}`
    File.write(input_path, decompressed_data)
  ensure
    file_7z.close
    file_7z.unlink
  end
end