//轉byte應該要指定編碼方式（不然可能會出錯） //PASSWORD_CRYPT_KEY需要為八位字節 package com.global.util;import java.io.UnsupportedEncodingException; import java.security.*; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec;import junit.framework.TestCase;public class CodeUtil extends TestCase{private static final String PASSWORD_CRYPT_KEY = "_kong____";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 返回加密后的數據* @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，然后用它把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，獲取數據并加密// 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 返回解密后的原始數據* @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，然后用它把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，獲取數據并解密// 正式執行解密操作return cipher.doFinal(src);}/*** 密碼解密* @param data* @return* @throws Exception*/public final static String decoder(String data){try {return new String(decrypt(hex2byte(data.getBytes("ISO-8859-1")),PASSWORD_CRYPT_KEY.getBytes("ISO-8859-1")));}catch(Exception e) {}return null;}/*** 密碼加密* @param password* @return* @throws Exception*/public final static String encoder(String password){try {return byte2hex(encrypt(password.getBytes("ISO-8859-1"),PASSWORD_CRYPT_KEY.getBytes("ISO-8859-1")));}catch(Exception e) {}return null;}/*** 二行制轉字符串* @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;elsehs = hs + stmp;}return hs.toUpperCase();}public static byte[] hex2byte(byte[] b) {if((b.length%2)!=0)throw new IllegalArgumentException("長度不是偶數");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 void test() throws UnsupportedEncodingException{String a = "zhazha";String b = byte2hex(a.getBytes("ISO-8859-1"));//String c = encrypt(b);System.out.println(decoder(encoder(a)));} }

轉載于:https://www.cnblogs.com/wead-hsu/p/3712280.html

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