[轉]JAVA AES 加密算法

本文轉自：http://blog.sina.com.cn/s/blog_7c8eb1590100svr0.html

package com.siro.tools;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class AESPlus {

?? ?public static String encrypt(String strKey, String strIn) throws Exception {
?? ??? ?SecretKeySpec skeySpec = getKey(strKey);
?? ??? ?Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
?? ??? ?IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
?? ??? ?cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
?? ??? ?byte[] encrypted = cipher.doFinal(strIn.getBytes());

?? ??? ?return new BASE64Encoder().encode(encrypted);
?? ?}

?? ?public static String decrypt(String strKey, String strIn) throws Exception {
?? ??? ?SecretKeySpec skeySpec = getKey(strKey);
?? ??? ?Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
?? ??? ?IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
?? ??? ?cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
?? ??? ?byte[] encrypted1 = new BASE64Decoder().decodeBuffer(strIn);

?? ??? ?byte[] original = cipher.doFinal(encrypted1);
?? ??? ?String originalString = new String(original);
?? ??? ?return originalString;
?? ?}

?? ?private static SecretKeySpec getKey(String strKey) throws Exception {
?? ??? ?byte[] arrBTmp = strKey.getBytes();
?? ??? ?byte[] arrB = new byte[16]; // 創建一個空的16位字節數組（默認值為0）

?? ??? ?for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
?? ??? ??? ?arrB[i] = arrBTmp[i];
?? ??? ?}

?? ??? ?SecretKeySpec skeySpec = new SecretKeySpec(arrB, "AES");

?? ??? ?return skeySpec;
?? ?}

?? ?public static void main(String[] args) throws Exception {
?? ??? ?String Code = "中文ABc123";
?? ??? ?String key = "1q2w3e4r";
?? ??? ?String codE;

?? ??? ?codE = AESPlus.encrypt(key, Code);

?? ??? ?System.out.println("原文：" + Code);
?? ??? ?System.out.println("密鑰：" + key);
?? ??? ?System.out.println("密文：" + codE);
?? ??? ?System.out.println("解密：" + AESPlus.decrypt(key, codE));
?? ?}
}