JAVA实现AES的加密和解密算法

JAVA实现AES的加密和解密算法加密模式为 AES-128-CBC
 1 import javax.crypto.Cipher;
 2 import javax.crypto.spec.IvParameterSpec;
 3 import javax.crypto.spec.SecretKeySpec;
 4 
 5 import sun.misc.BASE64Decoder;
 6 import sun.misc.BASE64Encoder;
 7 
 8 /**AES 是一种可逆加密算法，对用户的敏感信息加密处理
 9 * 对原始数据进行AES加密后，在进行Base64编码转化；
10 */
11 public class AESOperator {
12 /*
13 * 加密用的Key 可以用26个字母和数字组成
14 * 此处使用AES-128-CBC加密模式，key需要为16位。
15 */
16 private String sKey=”0123456789abcdef”;
17 private String ivParameter=”0123456789abcdef”;
18 private static AESOperator instance=null;
19 private AESOperator(){
20 
21 }
22 public static AESOperator getInstance(){
23 if (instance==null)
24 instance= new AESOperator();
25 return instance;
26 }
27 // 加密
28 public String encrypt(String sSrc) throws Exception {
29 Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”);
30 byte[] raw = sKey.getBytes();
31 SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);
32 IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
33 cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
34 byte[] encrypted = cipher.doFinal(sSrc.getBytes(“utf-8″));
35 return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
36 }
37 
38 // 解密
39 public String decrypt(String sSrc) throws Exception {
40 try {
41 byte[] raw = sKey.getBytes(“ASCII”);
42 SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);
43 Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”);
44 IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
45 cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
46 byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
47 byte[] original = cipher.doFinal(encrypted1);
48 String originalString = new String(original,”utf-8″);
49 return originalString;
50 } catch (Exception ex) {
51 return null;
52 }
53 }
54 
55 public static void main(String[] args) throws Exception {
56 // 需要加密的字串
57 String cSrc = “我来自www.xxxx.com”;
58 System.out.println(cSrc);
59 // 加密
60 long lStart = System.currentTimeMillis();
61 String enString = AESOperator.getInstance().encrypt(cSrc);
62 System.out.println(“加密后的字串是：” + enString);
63 
64 long lUseTime = System.currentTimeMillis() – lStart;
65 System.out.println(“加密耗时：” + lUseTime + “毫秒”);
66 // 解密
67 lStart = System.currentTimeMillis();
68 String DeString = AESOperator.getInstance().decrypt(enString);
69 System.out.println(“解密后的字串是：” + DeString);
70 lUseTime = System.currentTimeMillis() – lStart;
71 System.out.println(“解密耗时：” + lUseTime + “毫秒”);
72 }
73 }