C#与java可以共用的DES加密解密

C#的DES加密与解密算法我就不写了，主要写一下怎么去解密C#用DES加密后串，大家都知道C#的DES加密密钥长度是8位的，而java是8的倍数位，所以用普通的java中的DES是不行的，要解C#的加密的串用下面的方法

/**
     * 解密c#的des加密串
     * @param message
     * @param key
     * @return
     * @throws Exception
     */
    public static String desDncrypt(byte[] message, String key) throws Exception {
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
        byte[] retByte = cipher.doFinal(message);
        return new String(retByte);
    }

同理，如果java用DES加密让C#去解密呢？用以下方法加密

public static byte[] desEncrypt(String message, String key) throws Exception {
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

        return cipher.doFinal(message.getBytes("UTF-8"));
    }

这样就没有问题了，快去试试吧