實現DES加密和解密的類

最近做東西時，用到密碼的加密存儲問題，轉一個加密工具

/* * Created on 2003-10-20 by Liudong. */ package lius.crypto.DES; import java.security.*; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; /** * 實現DES加密和解密的過程 * @author Liudong */ public class DESCipher { private final static String DES = "DES"; /** * 加密 * @param src 數據源 * @param key 密鑰，長度必須是8的倍數 * @return 返回加密後的數據 * @throws Exception */ public static byte[] encrypt(byte[] src, byte[] key) throws Exception { //DES算法要求有一個可信任的隨機數源 SecureRandom sr = new SecureRandom(); // 從原始密匙數據創建DESKeySpec對象 DESKeySpec dks = new DESKeySpec(key); // 創建一個密匙工廠，然後用它把DESKeySpec轉換成 // 一個SecretKey對象 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES); SecretKey securekey = keyFactory.generateSecret(dks); // Cipher對象實際完成加密操作 Cipher cipher = Cipher.getInstance(DES); // 用密匙初始化Cipher對象 cipher.init(Cipher.ENCRYPT_MODE, securekey, sr); // 現在，獲取數據並加密 // 正式執行加密操作 return cipher.doFinal(src); } /** * 解密 * @param src 數據源 * @param key 密鑰，長度必須是8的倍數 * @return 返回解密後的原始數據 * @throws Exception */ public static byte[] decrypt(byte[] src, byte[] key) throws Exception { // DES算法要求有一個可信任的隨機數源 SecureRandom sr = new SecureRandom(); // 從原始密匙數據創建一個DESKeySpec對象 DESKeySpec dks = new DESKeySpec(key); // 創建一個密匙工廠，然後用它把DESKeySpec對象轉換成 // 一個SecretKey對象 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES); SecretKey securekey = keyFactory.generateSecret(dks); // Cipher對象實際完成解密操作 Cipher cipher = Cipher.getInstance(DES); // 用密匙初始化Cipher對象 cipher.init(Cipher.DECRYPT_MODE, securekey, sr); // 現在，獲取數據並解密 // 正式執行解密操作 return cipher.doFinal(src); } /** * 二進制轉字符串 * @param b * @return */ private 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; if (n < b.length - 1) hs = hs + ":"; } return hs.toUpperCase(); } /** * 測試入口 * @param args */ public static void main(String[] args) throws Exception{ byte[] key = "Hello123".getBytes(); byte[] src = "你好,中國".getBytes(); byte[] des = encrypt(src,key); System.out.println(byte2hex(des)); des = decrypt(des,key); System.out.println(byte2hex(des)); System.out.println(new String(des)); } }