import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
* 功能:AES加密解密工具类
* 日期:2022-5-5
*
* @author lf
*/
public class AesUtil2 {
/**
* 私钥,用于加解密
*/
public static final String KEY = "LYPUSRysSUWnykV5";
/**
* 密钥如超过16位,截至16位,不足16位,补/000至16位
*
* @param key 原密钥
* @return 新密钥
*/
public static String secureBytes(String key) {
if (key.length() > 16) {
key = key.substring(0, 16);
} else if (key.length() < 16) {
for (int i = (key.length() - 1); i < 15; i++) {
key += "\000";
}
}
return key;
}
/**
* AES解密 用于数据库储存
*
* @param key
* @param sSrc
* @return
* @throws Exception
*/
public static String decrypt(String key, String sSrc) throws Exception {
String sKey = secureBytes(key);
// 判断Key是否正确
if (sKey == null) {
return null;
}
// 判断Key是否为16位
if (sKey.length() != 16) {
sKey = secureBytes(sKey);
}
byte[] raw = sKey.getBytes("ASCII");
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] encrypted1 = hex2byte(sSrc);
byte[] original = cipher.doFinal(encrypted1);
String originalString = new String(original, "utf-8");
return originalString;
}
/**
* AES加密
*
* @param key
* @param sSrc
* @return
* @throws Exception
*/
public static String encrypt(String key, String sSrc) throws Exception {
String sKey = secureBytes(key);
if (sSrc == null || sKey == null) {
return null;
}
// 判断Key是否为16位
if (sKey.length() != 16) {
sKey = secureBytes(sKey);
}
byte[] raw = sKey.getBytes("ASCII");
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
return byte2hex(encrypted).toLowerCase();
}
/**
* @param strhex
* @return
*/
public static byte[] hex2byte(String strhex) {
if (strhex == null) {
return null;
}
int l = strhex.length();
if (l % 2 != 0) {
return null;
}
byte[] b = new byte[l / 2];
for (int i = 0; i != l / 2; i++) {
b[i] = (byte) Integer.parseInt(strhex.substring(i * 2, i * 2 + 2),
16);
}
return b;
}
/**
* @param b
* @return
*/
public static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1) {
hs = hs + "0" + stmp;
} else {
hs = hs + stmp;
}
}
return hs.toUpperCase();
}
public static void main(String[] args) throws Exception {
// 待加密字符串
String txt = "测试一下";
// 加密
String enTxt = AesUtil2.encrypt(KEY, txt);
System.out.println("加密后的字符串:" + enTxt);
// 解密
String decTxt = AesUtil2.decrypt(KEY, enTxt);
System.out.println("解密后的字符串:" + decTxt);
}
}
结果: