DES加密算法工具类

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import java.security.Key;import java.security.spec.AlgorithmParameterSpec;import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec;public class DESUtils2 {    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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