密码加密，解密工具类
package com.baosight.efmpx.system.util;import java.security.*;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;/** * 加密，解密工具类 * @author * */public final class EncryptUtil { private static final String PASSWORD_CRYPT_KEY = "__jDlog_"; 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 s = "002400"; String ss = EncryptUtil.encrypt(s); String sss = EncryptUtil.decrypt(ss); System.out.println(s); System.out.println(ss); System.out.println(sss); }}