package com.ff.base.utils;

import com.ff.base.exception.base.BaseException;
import lombok.Data;

import javax.crypto.*;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;


/**
 * 解密有用
 *
 * @author shi
 * @date 2025/03/24
 */
public class DESEncryptUtils {


    /**
     * 给…解密
     *
     * @param inString 字符串中
     * @param key      钥匙
     * @return {@link String }
     * @throws Exception 例外
     */
    public static String DESEncrypt(String inString, String key) {

        try {

            byte[] encryptKey = key.getBytes(); // encryptKey
            KeySpec keySpec = new DESKeySpec(encryptKey);
            SecretKey myDesKey = SecretKeyFactory.getInstance("DES").generateSecret(keySpec);
            IvParameterSpec iv = new IvParameterSpec(encryptKey);

            KeyGenerator keygenerator = KeyGenerator.getInstance("DES");

            Cipher desCipher;

            // Create the cipher
            desCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

            // Initialize the cipher for encryption
            desCipher.init(Cipher.ENCRYPT_MODE, myDesKey, iv);

            //sensitive information
            String source = inString;
            byte[] text = source.getBytes();

            System.out.println("Text [Byte Format] : " + text);
            System.out.println("Text : " + new String(text));

            // Encrypt the text
            byte[] textEncrypted = desCipher.doFinal(text);
            String t = Base64.getEncoder().encodeToString(textEncrypted);

            System.out.println("Text Encryted [Byte Format] : " + textEncrypted);
            System.out.println("Text Encryted : " + t);

            // Initialize the same cipher for decryption
            desCipher.init(Cipher.DECRYPT_MODE, myDesKey, iv);

            // Decrypt the text
            byte[] textDecrypted = desCipher.doFinal(textEncrypted);

            System.out.println("Text Decryted : " + new String(textDecrypted));
            return t;

        } catch (Exception e) {
            throw new BaseException("解密失败");
        }
    }


}