描述

屬于：對(duì)稱加密算法
特點(diǎn)：比des加解密更安全，速度更慢。
用法：通過(guò)一個(gè)公共密鑰進(jìn)行加解密。

實(shí)現(xiàn)代碼：

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;
import java.util.logging.Level;
import java.util.logging.Logger;

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



public class AESUtil{
    
    private static final String KEY_ALGORITHM = "AES";
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";//默認(rèn)的加密算法
    
    /**
     * AES 加密操作
     *
     * @param content 待加密內(nèi)容
     * @param key 加密密鑰
     * @return 返回Base64轉(zhuǎn)碼后的加密數(shù)據(jù)
     */
    public static String encrypt(String content, String key) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 創(chuàng)建密碼器
    
            byte[] byteContent = content.getBytes("utf-8");
    
            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(key));// 初始化為加密模式的密碼器
    
            byte[] result = cipher.doFinal(byteContent);// 加密
            
            return Base64Utils.encode(result);//通過(guò)Base64轉(zhuǎn)碼返回
            
        } catch (Exception ex) {
            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
    
        return null;
    }
    
    /**
     * AES 解密操作
     *
     * @param content
     * @param key
     * @return
     */
    public static String decrypt(String content, String key) {
    
        try {
            //實(shí)例化
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
    
            //使用密鑰初始化，設(shè)置為解密模式
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(key));
    
            //執(zhí)行操作
            byte[] result = cipher.doFinal(Base64Utils.decode(content));
            
    
            return new String(result, "utf-8");
        } catch (Exception ex) {
            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
    
        return null;
    }
    
    /**
     * 生成加密秘鑰
     *
     * @return
     */
    private static SecretKeySpec getSecretKey(final String key) {
        //返回生成指定算法密鑰生成器的 KeyGenerator 對(duì)象
        KeyGenerator kg = null;
    
        try {
            kg = KeyGenerator.getInstance(KEY_ALGORITHM);
    
            //AES 要求密鑰長(zhǎng)度為 128
            kg.init(128, new SecureRandom(key.getBytes()));
    
            //生成一個(gè)密鑰
            SecretKey secretKey = kg.generateKey();
    
            return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 轉(zhuǎn)換為AES專用密鑰
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
    
        return null;
    }
    
    public static void main(String[] args) {
        String content = "hello,您好";
        String key = "sde@5f98H*^hsff%dfs$r344&df8543*er";
        System.out.println("content:" + content);
        String s1 = AESUtil.encrypt(content, key);
        System.out.println("s1:" + s1);
        System.out.println("s2:"+AESUtil.decrypt(s1, key));
    
    }
    
}

運(yùn)行結(jié)果：

content:hello,您好
s1:zcMUh2txC6JxbGqKQeZ/kA==
s2:hello,您好

參考

java對(duì)稱加密與非對(duì)稱加密：https://blog.csdn.net/chengbinbbs/article/details/78640589