Java DES 加密 解密 示例

代码：

package com.techzero.des;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;/** * DESTest.java *  * @author Techzero * @Email [e-mail] * @Time 2013-12-12 下午2:22:58 */public class DESTest {/** * @param args */public static void main(String[] args) {String content = "DESTest";// 密码长度必须是8的倍数String password = "12345678";System.out.println("密　钥：" + password);System.out.println("加密前：" + content);byte[] result = encrypt(content, password);System.out.println("加密后：" + new String(result));String decryResult = decrypt(result, password);System.out.println("解密后：" + decryResult);}/** * 加密 *  * @param content *            待加密内容 * @param key *            加密的密钥 * @return */public static byte[] encrypt(String content, String key) {try {SecureRandom random = new SecureRandom();DESKeySpec desKey = new DESKeySpec(key.getBytes());SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey securekey = keyFactory.generateSecret(desKey);Cipher cipher = Cipher.getInstance("DES");cipher.init(Cipher.ENCRYPT_MODE, securekey, random);byte[] result = cipher.doFinal(content.getBytes());return result;} catch (Throwable e) {e.printStackTrace();}return null;}/** * 解密 *  * @param content *            待解密内容 * @param key *            解密的密钥 * @return */public static String decrypt(byte[] content, String key) {try {SecureRandom random = new SecureRandom();DESKeySpec desKey = new DESKeySpec(key.getBytes());SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey securekey = keyFactory.generateSecret(desKey);Cipher cipher = Cipher.getInstance("DES");cipher.init(Cipher.DECRYPT_MODE, securekey, random);byte[] result = cipher.doFinal(content);return new String(result);} catch (Throwable e) {e.printStackTrace();}return null;}}

运行结果：

密　钥：12345678
加密前：DESTest
加密后：��d��{�
解密后：DESTest