encryptzip.rb

require 'java'

import java.io.BufferedInputStream
import java.io.BufferedOutputStream
import java.io.FileInputStream
import java.io.FileNotFoundException
import java.io.FileOutputStream
import java.util.zip.ZipEntry
import java.util.zip.ZipOutputStream

# Create Plane Zip file
zip = ZipOutputStream.new(BufferedOutputStream.new(FileOutputStream.new("arc.zip")))

filename = "test1.txt"
file = BufferedInputStream.new(FileInputStream.new(filename))
zip.put_next_entry(ZipEntry.new(java.io.File.new(filename).get_name))

data = nil
while ((data = file.read()) != -1)
  zip.write(data)
end

file.close
zip.close_entry
zip.close

# Encrypted Zip
# Use ZipCloak
# http://www.ne.jp/asahi/hishidama/home/tech/soft/java/zip.html

import Java::jp.hishidama.zip.ZipCloak

plane_zip = java.io.File.new("arc.zip")
crypt_zip = java.io.File.new("cryptarc.zip")
password = "password"

czip = ZipCloak.new(plane_zip)
czip.encrypt(crypt_zip, password.to_java_bytes)