AES加密算法

package com.util;

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

import org.apache.commons.codec.binary.Base64;

public class AESutil {
//AES加密
public static String Encrypt(String sSrc, String sKey) throws Exception {
if (sKey == null) {
return null;
}
// 判斷Key是否爲16位
if (sKey.length() != 16) {
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(sKey.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 Base64().encodeToString(encrypted);//此處使用BAES64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) {
return null;
}
// 判斷Key是否爲16位
if (sKey.length() != 16) {
return null;
}
byte[] raw = sKey.getBytes("ASCII");
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec iv = new IvParameterSpec(sKey
.getBytes());
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
byte[] encrypted1 = new Base64().decodeBase64(sSrc);//先用bAES64解密
try {
byte[] original = cipher.doFinal(encrypted1);
String originalString = new String(original);
return originalString;
} catch (Exception e) {
return null;
}
} catch (Exception ex) {
return null;
}
}
public static void main(String[] args) throws Exception {

String sSrc="aaaaa";
String sKey="7ahfKukxeENu4pDh";

String s=AESutil.Encrypt(sSrc, sKey);
System.err.println(s);
s=AESutil.Decrypt(s, sKey);
System.err.println(s);
}
}