des加密

public class DesUtil {
private final static String DES = “DES”;

/**
 * Description 根据键值进行加密
 *
 * @param data
 * @param key
 *            加密键byte数组
 * @return
 * @throws Exception
 */
public static String encrypt(String data, String key) {
    byte[] bt = null;
    try {
        bt = encrypt(data.getBytes("utf-8"), key.getBytes());
    } catch (Exception e) {
        e.printStackTrace();
    }
    String strs = new BASE64Encoder().encode(bt);
    return strs;
}

/**
 * Description 根据键值进行解密
 *
 * @param data
 * @param key
 *            加密键byte数组
 * @return
 * @throws IOException
 * @throws Exception
 */
public static String decrypt(String data, String key) throws IOException,
        Exception {
    if (data == null)
        return null;
    BASE64Decoder decoder = new BASE64Decoder();
    byte[] buf = decoder.decodeBuffer(data);
    byte[] bt = decrypt(buf, key.getBytes());
    return new String(bt, "utf-8");
}

/**
 * Description 根据键值进行加密
 *
 * @param data
 * @param key
 *            加密键byte数组
 * @return
 * @throws Exception
 */
private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
    // 生成一个可信任的随机数源
    SecureRandom sr = new SecureRandom();

    // 从原始密钥数据创建DESKeySpec对象
    DESKeySpec dks = new DESKeySpec(key);

    // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
    SecretKey securekey = keyFactory.generateSecret(dks);

    // Cipher对象实际完成加密操作
    Cipher cipher = Cipher.getInstance(DES);

    // 用密钥初始化Cipher对象
    cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

    return cipher.doFinal(data);
}

/**
 * Description 根据键值进行解密
 *
 * @param data
 * @param key
 *            加密键byte数组
 * @return
 * @throws Exception
 */
private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
    // 生成一个可信任的随机数源
    SecureRandom sr = new SecureRandom();

    // 从原始密钥数据创建DESKeySpec对象
    DESKeySpec dks = new DESKeySpec(key);

    // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
    SecretKey securekey = keyFactory.generateSecret(dks);

    // Cipher对象实际完成解密操作
    Cipher cipher = Cipher.getInstance(DES);

    // 用密钥初始化Cipher对象
    cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

    return cipher.doFinal(data);
}

/**
 * 将二进制转换成16进制
 *
 * @param buf
 * @return
 */

public static String parseByte2HexStr(byte buf[]) {
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < buf.length; i++) {
        String hex = Integer.toHexString(buf[i] & 0xFF);
        sb.append(hex);
    }
    return sb.toString();
}

}