Ruby下可逆加密

class Des  
  require 'openssl'  
  require 'base64'  
  ALG = 'DES-EDE3-CBC'  
  KEY = "mZ4Wjs6L"  
  DES_KEY = "nZ4wJs6L"  
  
  #加密  
  def encode(str)  
    des = OpenSSL::Cipher::Cipher.new(ALG)  
    des.pkcs5_keyivgen(KEY, DES_KEY)  
    des.encrypt  
    cipher = des.update(str)  
    cipher << des.final  
    return Base64.encode64(cipher) #Base64编码，才能保存到数据库  
  end  
  
  #解密    
  def decode(str)  
    str = Base64.decode64(str)  
    des = OpenSSL::Cipher::Cipher.new(ALG)  
    des.pkcs5_keyivgen(KEY, DES_KEY)  
    des.decrypt  
    des.update(str) + des.final  
  end  
end  
  
 require 'pp'  
 des = Des.new  
 str = '1234567890123456'  
 pp '=====encrypt====='  
 str = des.encode(str)  
 pp str  
  
 pp  '=====decrypt====='  
 pp des.decode(str)