AES 对称加密解密工具类

最近在做一个邮件找回密码功能时，需要对核心参数加密，所以记录下来。

package com.ptpl.web.util;


 
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;


 
public class AES {


private static String rawKey = "6bd5601c8ced37e7229c9fbdb76493a8";


/**
* AES
*/


private final static String algorithm = "AES";


/*
* 转为十六进制
*/
private static String asHex(byte buf[]) {
StringBuffer strbuf = new StringBuffer(buf.length * 2);
int i;


for (i = 0; i < buf.length; i++) {
if ((buf[i] & 0xff) < 0x10)
strbuf.append("0");


strbuf.append(Long.toString(buf[i] & 0xff, 16));
}
return strbuf.toString();
}


/*
* 转为二进制
*/
private static byte[] asBin(String src) {
if (src.length() < 1)
return null;
byte[] encrypted = new byte[src.length() / 2];
for (int i = 0; i < src.length() / 2; i++) {
int high = Integer.parseInt(src.substring(i * 2, i * 2 + 1), 16);
int low = Integer.parseInt(src.substring(i * 2 + 1, i * 2 + 2), 16);


encrypted[i] = (byte) (high * 16 + low);
}
return encrypted;
}


/*
* 得到密钥key
*/
public static String getRawKey() {


try {
KeyGenerator kgen = KeyGenerator.getInstance(algorithm);// 获取密匙生成器
kgen.init(128); // 192 and 256 bits may not be available


SecretKey skey = kgen.generateKey();// 生成密匙，可用多种方法来保存密匙
byte[] raw = skey.getEncoded();
return asHex(raw);
} catch (Exception e) {
return "";
}


}


/**
* 进行加密
*/
public static String getEncrypt(String message) {
return getEncrypt(message, rawKey);
}


/**
* 进行解密
*/


public static String getDecrypt(String message) {
return getDecrypt(message, rawKey);
}


/*
* 加密
*/
public static String getEncrypt(String message, String rawKey) {
byte[] key = asBin(rawKey);
try {
SecretKeySpec skeySpec = new SecretKeySpec(key, algorithm);


Cipher cipher = Cipher.getInstance(algorithm);// 创建密码器


cipher.init(Cipher.ENCRYPT_MODE, skeySpec);


byte[] encrypted = cipher.doFinal(message.getBytes());


return asHex(encrypted);
} catch (Exception e) {
return "";
}


}


/*
* 解密
*/
public static String getDecrypt(String encrypted, String rawKey) {
byte[] tmp = asBin(encrypted);
byte[] key = asBin(rawKey);


try {
SecretKeySpec skeySpec = new SecretKeySpec(key, algorithm);


Cipher cipher = Cipher.getInstance(algorithm);


cipher.init(Cipher.DECRYPT_MODE, skeySpec);


byte[] decrypted = cipher.doFinal(tmp);


return new String(decrypted);
} catch (Exception e) {
return "";
}


}


public static void main(String[] args) throws Exception {
String str = "加密测试";
String str2 =  AES.getEncrypt(str);//加密
String str3 = AES.getDecrypt(str2);//解密
System.out.println(str +"======"+str2 +"======="+str3);//加密测试======80ab5742bee87f01cef2e32693dfd2e6=======加密测试
}
}