自定义密钥生成密码

package com.xuyt.genpwd.utils;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

/**
 * 自定义密匙加密
 */
public class CiperDemo {

    public static final String DES = "DES";

    public static void main(String[] args) throws Exception {

        String masterPassword = "YourPwd!@#123";

        //key不能设置小于8位，使用*进行补全
        String key = String.format("%8s", "qqaaaaa").replaceAll("\\s", "*");

        //加密
        byte[] mEncrypt = encrypt(masterPassword, key);
        //打印加密
        System.out.println("加密后:" + new String(mEncrypt));

        //解密
        byte[] mDerypt = derypt(mEncrypt, key);
        //打印解密
        System.out.println("解密后:" + new String(mDerypt));

    }

    private static byte[] derypt(byte[] mEncrypt, String key) throws Exception {
        DESKeySpec keySpec = new DESKeySpec(key.getBytes());
        SecretKey secret = SecretKeyFactory.getInstance(DES).generateSecret(keySpec);
        Cipher cipher = Cipher.getInstance(DES);
        cipher.init(Cipher.DECRYPT_MODE, secret);

        return cipher.doFinal(Base64.getDecoder().decode(mEncrypt));
    }

    private static byte[] encrypt(String input, String key) throws Exception {
        //密匙规范--把自己想变成密匙的字符串规范成密匙对象
        DESKeySpec keySpec = new DESKeySpec(key.getBytes());
        //通过密匙工厂获取密匙
        SecretKey secretKey = SecretKeyFactory.getInstance(DES).generateSecret(keySpec);

        //获取加密对象
        Cipher cipher = Cipher.getInstance(DES);
        //初始化对象
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        //进行加密
        byte[] bs = cipher.doFinal(input.getBytes(StandardCharsets.UTF_8));

        return Base64.getEncoder().encode(bs);
    }

}