JAVA實現AES的加密和解密算法

JAVA實現AES的加密和解密算法 加密模式為 AES-128-CBC

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

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

/**AES 是一種可逆加密算法，對用戶的敏感信息加密處理
* 對原始數據進行AES加密后，在進行Base64編碼轉化；
*/
public class AESOperator {
/*
* 加密用的Key 可以用26個字母和數字組成
* 此處使用AES-128-CBC加密模式，key需要為16位。
*/
private String sKey=”0123456789abcdef”;
private String ivParameter=”0123456789abcdef”;
private static AESOperator instance=null;
private AESOperator(){

}
public static AESOperator getInstance(){
if (instance==null)
instance= new AESOperator();
return instance;
}
// 加密
public String encrypt(String sSrc) throws Exception {
Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”);
byte[] raw = sKey.getBytes();
SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);
IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一個向量iv，可增加加密算法的強度
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] encrypted = cipher.doFinal(sSrc.getBytes(“utf-8″));
return new BASE64Encoder().encode(encrypted);//此處使用BASE64做轉碼。
}

// 解密
public String decrypt(String sSrc) throws Exception {
try {
byte[] raw = sKey.getBytes(“ASCII”);
SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);
Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”);
IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
byte[] original = cipher.doFinal(encrypted1);
String originalString = new String(original,”utf-8″);
return originalString;
} catch (Exception ex) {
return null;
}
}

public static void main(String[] args) throws Exception {
// 需要加密的字串
String cSrc = “我來自www.wenhq.com”;
System.out.println(cSrc);
// 加密
long lStart = System.currentTimeMillis();
String enString = AESOperator.getInstance().encrypt(cSrc);
System.out.println(“加密后的字串是：” + enString);

long lUseTime = System.currentTimeMillis() – lStart;
System.out.println(“加密耗時：” + lUseTime + “毫秒”);
// 解密
lStart = System.currentTimeMillis();
String DeString = AESOperator.getInstance().decrypt(enString);
System.out.println(“解密后的字串是：” + DeString);
lUseTime = System.currentTimeMillis() – lStart;
System.out.println(“解密耗時：” + lUseTime + “毫秒”);
}
}