Java版的DES加密工具類

一個Java版的DES加密工具類，可以用來進行網絡數據傳輸加密，保存密碼的時候進行加密。

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;

/**
 * 加密解密工具包
 */
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  加密私鑰，長度不能夠小于8位
     * @return 加密后的字節數組，一般結合Base64編碼使用
     * @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的長度不能夠小于8位字節
            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  解密私鑰，長度不能夠小于8位
     * @return 解密后的字節數組
     * @throws Exception 異常
     */
    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的長度不能夠小于8位字節
            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;
        }
    }

    /**
     * 二行制轉字符串
     * @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;
    }

}