AES工具類

AES

package com.sondon.NettyDemo;


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

import org.apache.log4j.Logger;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/** * * @Project : NettyDemo * @Package : com.sondon.NettyDemo * @Class : AESTool.java * @Company 廣州訊動網絡科技有限公司 * @Author : 蔡文鋒 * @DateTime：2015年4月16日 上午9:38:31 * @Blog：http://blog.csdn.net/caiwenfeng_for_23 * @Description : { * AESTool工具 * } */
public class AESTool {
    protected static final Logger log = Logger.getLogger(AESTool.class);

      private byte[] initVector = { 0x32, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31,
          0x38, 0x27, 0x36, 0x35, 0x33, 0x23, 0x32, 0x31 };

      /** * FIXME For demo only, should rewrite this method in your product environment! * * @param appid * @return */
      public static String findKeyById(String appid) {
        // Fake key.
        String key = "12345678901234567890123456789012";
        return key;
      }

      // 加密
        public static String Encrypt(String sSrc, String sKey) throws Exception {
            if (sKey == null) {
                System.out.print("Key爲空null");
                return null;
            }
            // 判斷Key是否爲16位
            if (sKey.length() != 16) {
                System.out.print("Key長度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");//"算法/模式/補碼方式"
            IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());//使用CBC模式，須要一個向量iv，可增長加密算法的強度
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(sSrc.getBytes());

            return new BASE64Encoder().encode(encrypted);//此處使用BASE64作轉碼功能，同時能起到2次加密的做用。
        }

        // 解密
        public static String decrypt(String sSrc, String sKey) throws Exception {
            try {
                // 判斷Key是否正確
                if (sKey == null) {
                    System.out.print("Key爲空null");
                    return null;
                }
                // 判斷Key是否爲16位
                if (sKey.length() != 16) {
                    System.out.print("Key長度不是16位");
                    return null;
                }
                byte[] raw = sKey.getBytes("UTF-8");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                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(sSrc);//先用base64解密
                try {
                    byte[] original = cipher.doFinal(encrypted1);
                    String originalString = new String(original);
                    return originalString;
                } catch (Exception e) {
                    System.out.println(e.toString());
                    return null;
                }
            } catch (Exception ex) {
                System.out.println(ex.toString());
                return null;
            }
        }

        public static void main(String[] args) throws Exception {
            /* * 加密用的Key 能夠用26個字母和數字組成，最好不要用保留字符，雖然不會錯，至於怎麼裁決，我的看狀況而定 * 此處使用AES-128-CBC加密模式，key須要爲16位。 */
            String cKey = "1234567890abcdef";
            // 須要加密的字串
            String cSrc = "user＝15063142270,pwd＝110120";
            System.out.println(cSrc);
            // 加密
            long lStart = System.currentTimeMillis();
            String enString = AESTool.Encrypt(cSrc, cKey);
            System.out.println("加密後的字串是：" + enString);

            long lUseTime = System.currentTimeMillis() - lStart;
            System.out.println("加密耗時：" + lUseTime + "毫秒");
            // 解密
            lStart = System.currentTimeMillis();
            String DeString = AESTool.decrypt("etv++JDJX9cLbah7dcqF+9i+kRNzWzV9io+CUy8Tq0U==", cKey);
            System.out.println("解密後的字串是：" + DeString);
            lUseTime = System.currentTimeMillis() - lStart;
            System.out.println("解密耗時：" + lUseTime + "毫秒");
        }
}