des解密

public byte[] doDECRYPT(byte[] plainText, byte[] desKey) throws Exception {// DES算法要求有一个可信任的随机数源// des need a datasourceSecureRandom sr = new SecureRandom();// get key data from a methodbyte rawKeyData[] = desKey;/* 用某种方法获得密匙数据 */// byte[] rawKeyData={0x01,0x08,0x07,0x06,0x08,0x07,0x06,0x08};// create DESKeySpec Object with source key// 从原始密匙数据创建DESKeySpec对象DESKeySpec dks = new DESKeySpec(rawKeyData);// create SecretKeyFactory,and convert it to SecretKey Object// 创建一个密匙工厂，然后用它把DESKeySpec转换成// 一个SecretKey对象SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey key = keyFactory.generateSecret(dks);// to finish encrypting data// Cipher对象实际完成加密操作// if element is "des" the result byte[] maybe append data// like 0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x07,0x08Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");// Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 用密匙初始化Cipher对象// init the Cipher objectcipher.init(Cipher.DECRYPT_MODE, key, sr);// cipher.init(Cipher.ENCRYPT_MODE, key,sr);// 现在，获取数据并加密// get data and encrypt data// byte data[] = plainText;/* 用某种方法获取数据 */// 正式执行加密操作// ConvertUtil cu = new ConvertUtil();// byte[] data1 = {0x01,0x08,0x07,0x06,0x08};// execute encryptbyte encryptedData[] = cipher.doFinal(plainText);return encryptedData;}