DES对字符串的加密

import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;/** * DES加密介绍: * DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用相同密钥的算法。DES加密算法出自IBM的研究， * 后来被美国政府正式采用，之后开始广泛流传，但是近些年使用越来越少，因为DES使用56位密钥，以现代计算能力， * 可以较容易破解 * 注意：DES加密和解密过程中，密钥长度都必须是8的倍数 */public class DES {    private static final byte[] IV_VALUE = {12, 24, 48, 36, 48, 60, 72, 84};    private static final byte[] KEY = {0X64, 0X6A, 0X71, 0X68, 0X2E, 0X63, 0X6F, 0X6D};    public static String encryptDES(String str) throws Exception {        IvParameterSpec zeroIv = new IvParameterSpec(IV_VALUE);        SecretKeySpec key = new SecretKeySpec(KEY, "DES");        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");        cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);        byte[] encryptedData = cipher.doFinal(str.getBytes("UTF-8"));        return new BASE64Encoder().encode(encryptedData);    }    public static String decryptDES(String miwen) throws Exception {        byte[] byteMi = new BASE64Decoder().decodeBuffer(miwen);        IvParameterSpec zeroIv = new IvParameterSpec(IV_VALUE);        SecretKeySpec key = new SecretKeySpec(KEY, "DES");        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");        cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);        byte decryptedData[] = cipher.doFinal(byteMi);        return new String(decryptedData, "UTF-8");    }}