###DES加密

生成DES加密KEY

DES的KEY：abcdefgh 偏移量：abcdefgh 填充模式：DES/CBC/PKCS5Padding

1.先DES加密

2.再base64编码

如123456，进行DES加密，得到byte数组

再进行Base64编码：opfVWWpnmcY=

Java代码：
加密：
public static String encrypt(String data, String desKey) throws Exception {
    if (data == null) return null;
	DESKeySpec dks = new DESKeySpec(desKey.getBytes());
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey securekey = keyFactory.generateSecret(dks);
    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, securekey, new IvParameterSpec(desKey.getBytes()));
	return new BASE64Encoder().encode(cipher.doFinal(data.getBytes()));
}

解密：
public static String decrypt(String data, String desKey) throws Exception {
    if (data == null) return null;
    BASE64Decoder decoder = new BASE64Decoder();
    byte[] buf = decoder.decodeBuffer(data);
	DESKeySpec dks = new DESKeySpec(desKey.getBytes());
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
	SecretKey securekey = keyFactory.generateSecret(dks);
    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
	cipher.init(Cipher.DECRYPT_MODE, securekey, new IvParameterSpec(desKey.getBytes()));
    byte[] bt= cipher.doFinal(buf);
    return new String(bt);
}