JAVA实现AES的加密和解密算法

原文 JAVA实现AES的加密和解密算法

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec; import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder; /**
* AES 是一种可逆加密算法,对用户的敏感信息加密处理
* 对原始数据进行AES加密后,在进行Base64编码转化;
*/
public class AESOperator {
/*
* 加密用的Key 可以用26个字母和数字组成
* 此处使用AES-128-CBC加密模式,key需要为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,需要一个向量iv,可增加加密算法的强度
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
} // 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 = "我来自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("加密耗时:" + 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("解密耗时:" + lUseTime + "毫秒");
}
}
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