廖雪峰Java10加密与安全-4加密算法-1对称加密算法

对称加密算法

加密和解密使用同一个密钥，例如WinRAR。
WinRAR在对文件进行打包的时候，可以设置一个密码，在解压的时候需要使用同样的密码才能正确的解压。
加密：encrypt(key,message) -> s
解密：decrypt(key,s) -> message

package com.testList;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.util.Base64;

public class SplitString {
    //指定工作模式
   static final String CIPHER_NAME = "AES/ECB/PKCS5Padding";
   //加密
   public static byte[] encrypt(byte[] key,byte[] input) throws GeneralSecurityException {
       //传入加密算法的名字，获得Cipher实例
       Cipher cipher = Cipher.getInstance(CIPHER_NAME);
       //传入key的byte数组，转化为AES的key
       SecretKeySpec keySpec = new SecretKeySpec(key,"AES");
       //初始化为加密模式，传入key
       cipher.init(cipher.ENCRYPT_MODE,keySpec);
       //传入加密的内容，获取加密后的数组
       return cipher.doFinal(input);
   }
   //解密，传入key，加密的输入
   public static byte[] decrypt(byte[] key,byte[] input) throws GeneralSecurityException{
       //获得一个cipher实例
       Cipher cipher = Cipher.getInstance(CIPHER_NAME);
       //
       SecretKeySpec keySpec = new SecretKeySpec(key,"AES");
       cipher.init(cipher.DECRYPT_MODE,keySpec);
       return cipher.doFinal(input);
   }
   public static void main(String[] args) throws Exception{
       //原文
       String message = "Hello world!encrypted using AES!";
       System.out.println("原文："+message);
       //128位密钥=16bytes key
       byte[] key = "1234567890abcdef".getBytes("UTF-8");
       byte[] data = message.getBytes(StandardCharsets.UTF_8);
       //加密
       byte[] encrypted = encrypt(key,data);
       System.out.println("Encryped data:"+Base64.getEncoder().encodeToString(encrypted));
       //解密
       byte[] decrypted = decrypt(key,encrypted);
       System.out.println("Decrypt data:"+new String(decrypted,"UTF-8"));
   }
}

原文地址：https://www.cnblogs.com/csj2018/p/10847053.html