DES加密类
public class DES {
?private static final String PASSWORD_CRYPT_KEY = "khkhkhkhkh";
?private final static String DES = "DES";
?/**
? * 加密
? *
? * @param src
? *??????????? 数据源
? * @param key
? *??????????? 密钥，长度必须是8的倍数
? * @return 返回加密后的数据
? * @throws Exception
? */
?public static byte[] encrypt(byte[] src, byte[] key) throws Exception {
??// DES算法要求有一个可信任的随机数源
??SecureRandom sr = new SecureRandom();
??// 从原始密匙数据创建DESKeySpec对象
??DESKeySpec dks = new DESKeySpec(key);
??// 创建一个密匙工厂，然后用它把DESKeySpec转换成
??// 一个SecretKey对象
??SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
??SecretKey securekey = keyFactory.generateSecret(dks);
??// Cipher对象实际完成加密操作
??Cipher cipher = Cipher.getInstance(DES);
??// 用密匙初始化Cipher对象
??cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
??// 现在，获取数据并加密
??// 正式执行加密操作
??return cipher.doFinal(src);
?}
?/**
? * 解密
? *
? * @param src
? *??????????? 数据源
? * @param key
? *??????????? 密钥，长度必须是8的倍数
? * @return 返回解密后的原始数据
? * @throws Exception
? */
?public static byte[] decrypt(byte[] src, byte[] key) throws Exception {
??// DES算法要求有一个可信任的随机数源
??SecureRandom sr = new SecureRandom();
??// 从原始密匙数据创建一个DESKeySpec对象
??DESKeySpec dks = new DESKeySpec(key);
??// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
??// 一个SecretKey对象
??SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
??SecretKey securekey = keyFactory.generateSecret(dks);
??// Cipher对象实际完成解密操作
??Cipher cipher = Cipher.getInstance(DES);
??// 用密匙初始化Cipher对象
??cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
??// 现在，获取数据并解密
??// 正式执行解密操作
??return cipher.doFinal(src);
?}
?/**
? * 密码解密
? *
? * @param data
? * @return
? * @throws Exception
? */
?public final static String decrypt(String data) {
??try {
???return new String(decrypt(hex2byte(data.getBytes()),
?????PASSWORD_CRYPT_KEY.getBytes()));
??} catch (Exception e) {
??}
??return null;
?}
?/**
? * 密码加密
? *
? * @param password
? * @return
? * @throws Exception
? */
?public final static String encrypt(String password) {
??try {
???return byte2hex(encrypt(password.getBytes(), PASSWORD_CRYPT_KEY
?????.getBytes()));
??} catch (Exception e) {
??}
??return null;
?}
?/**
? * 二行制转字符串
? *
? * @param b
? * @return
? */
?public static String byte2hex(byte[] b) {
??String hs = "";
??String stmp = "";
??for (int n = 0; n < b.length; n++) {
???stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
???if (stmp.length() == 1)
????hs = hs + "0" + stmp;
???else
????hs = hs + stmp;
??}
??return hs.toUpperCase();
?}
?public static byte[] hex2byte(byte[] b) {
??if ((b.length % 2) != 0)
???throw new IllegalArgumentException("长度不是偶数");
??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;
?}
?public static void main(String[] args) {
??String pwd = "dasdfaaaaaa";
??System.out.println("测试数据=" + pwd);
??String data = encrypt(pwd);
??System.out.println("加密后的数据data=" + data);
??pwd = decrypt(data);
??System.out.println("解密后=" + pwd);
?}
}
