加密解密工具包DES算法，加密

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public class CyptoUtils {public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";    /**     * DES算法，加密     *     * @param data 待加密字符串     * @param key  加密私钥，长度不能够小于8位     * @return 加密后的字节数组，一般结合Base64编码使用     * @throws InvalidAlgorithmParameterException      * @throws Exception      */    public static String encode(String key,String data) {    if(data == null)    return null;    try{    DESKeySpec dks = new DESKeySpec(key.getBytes());        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");        //key的长度不能够小于8位字节        Key secretKey = keyFactory.generateSecret(dks);        Cipher cipher = Cipher.getInstance(ALGORITHM_DES);        IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());        AlgorithmParameterSpec paramSpec = iv;        cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);                   byte[] bytes = cipher.doFinal(data.getBytes());                    return byte2hex(bytes);    }catch(Exception e){    e.printStackTrace();    return data;    }    }    /**     * DES算法，解密     *     * @param data 待解密字符串     * @param key  解密私钥，长度不能够小于8位     * @return 解密后的字节数组     * @throws Exception 异常     */    public static String decode(String key,String data) {    if(data == null)    return null;        try {    DESKeySpec dks = new DESKeySpec(key.getBytes());    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");            //key的长度不能够小于8位字节            Key secretKey = keyFactory.generateSecret(dks);            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);            IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());            AlgorithmParameterSpec paramSpec = iv;            cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);            return new String(cipher.doFinal(hex2byte(data.getBytes())));        } catch (Exception e){    e.printStackTrace();    return data;        }    }/** * 二行制转字符串 * @param b * @return */    private static String byte2hex(byte[] b) {StringBuilder hs = new StringBuilder();String stmp;for (int n = 0; b!=null && n < b.length; n++) {stmp = Integer.toHexString(b[n] & 0XFF);if (stmp.length() == 1)hs.append('0');hs.append(stmp);}return hs.toString().toUpperCase();}        private static byte[] hex2byte(byte[] b) {        if((b.length%2)!=0)            throw new IllegalArgumentException();byte[] b2 = new byte[b.length/2];for (int n = 0; n < b.length; n+=2) {    String item = new String(b,n,2);    b2[n/2] = (byte)Integer.parseInt(item,16);}        return b2;    }    }
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