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利用JAVA實(shí)現(xiàn)DES加密算法

更新時(shí)間：2013年08月30日 09:38:10 投稿：jingxian

本文簡(jiǎn)單講解DES的JAVA實(shí)現(xiàn)方法。需要的朋友可以過(guò)來(lái)參考下

JAVA實(shí)現(xiàn)
加密
代碼有詳細(xì)解釋?zhuān)欢鄰U話(huà)。
注意：DES加密和解密過(guò)程中，密鑰長(zhǎng)度都必須是8的倍數(shù)

        public byte[] desCrypto(byte[] datasource, String password) {           
                try{
                SecureRandom random = new SecureRandom();
                DESKeySpec desKey = new DESKeySpec(password.getBytes());
                //創(chuàng)建一個(gè)密匙工廠，然后用它把DESKeySpec轉(zhuǎn)換成
                SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
                SecretKey securekey = keyFactory.generateSecret(desKey);
                //Cipher對(duì)象實(shí)際完成加密操作
                Cipher cipher = Cipher.getInstance("DES");
                //用密匙初始化Cipher對(duì)象
                cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
                //現(xiàn)在，獲取數(shù)據(jù)并加密
                //正式執(zhí)行加密操作
                return cipher.doFinal(datasource);
                }catch(Throwable e){
                        e.printStackTrace();
                }
                return null;
        }

解密
代碼有詳細(xì)注釋?zhuān)欢鄰U話(huà)

復(fù)制代碼代碼如下:

        private byte[] decrypt(byte[] src, String password) throws Exception {
                // DES算法要求有一個(gè)可信任的隨機(jī)數(shù)源
                SecureRandom random = new SecureRandom();
                // 創(chuàng)建一個(gè)DESKeySpec對(duì)象
                DESKeySpec desKey = new DESKeySpec(password.getBytes());
                // 創(chuàng)建一個(gè)密匙工廠
                SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
                // 將DESKeySpec對(duì)象轉(zhuǎn)換成SecretKey對(duì)象
                SecretKey securekey = keyFactory.generateSecret(desKey);
                // Cipher對(duì)象實(shí)際完成解密操作
                Cipher cipher = Cipher.getInstance("DES");
                // 用密匙初始化Cipher對(duì)象
                cipher.init(Cipher.DECRYPT_MODE, securekey, random);
                // 真正開(kāi)始解密操作
                return cipher.doFinal(src);
        }

測(cè)試場(chǎng)景
例如，我們可以利用如上函數(shù)對(duì)字符串進(jìn)行加密解密，也可以對(duì)文件進(jìn)行加密解密，如：

復(fù)制代碼代碼如下:

                //待加密內(nèi)容
                String str = "測(cè)試內(nèi)容";
                //密碼，長(zhǎng)度要是8的倍數(shù)
                String password = "12345678";
                byte[] result = DESCrypto.desCrypto(str.getBytes(),password);
                System.out.println("加密后內(nèi)容為："+new String(result));
               
                //直接將如上內(nèi)容解密
                try {
                        byte[] decryResult = des.decrypt(result, password);
                        System.out.println("加密后內(nèi)容為："+new String(decryResult));
                } catch (Exception e1) {
                        e1.printStackTrace();
                }