此教程的背景：数据库密码忘记了，但是在Navicat连接过且目前能连接上的状态！

1.导出数据库连接 connections.ncx 文件

选择你要导出密码的数据库连接，切记要勾上导出密码

 2.使用文本编辑工具打开导出的connections.ncx 文件

找到Password=""，将双引号中间的密码复制出来使用下面的Java程序或PHP程序进行解密！

 3.使用Java程序进行解密

Java在线运行环境：代码在线运行 - 在线工具，进入选择Java即可！将以下代码复制到在线运行环境中并把代码中的密码替换为你自己connections.ncx文件中的密码运行即可！

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.util.Arrays;

/**
 * 以下程序均为ChatGPT生成
 * @Author: 木芒果
 */
public class NavicatPassword {
    public static void main(String[] args) throws Exception {
        NavicatPassword navicatPassword = new NavicatPassword();

        // 解密11版本及以前的密码
        //String decode = navicatPassword.decrypt("15057D7BA390", 11);

        // 解密12版本及以后的密码
        //String decode = navicatPassword.decrypt("15057D7BA390", 12);
        String decode = navicatPassword.decrypt("解密密码", 12);
        System.out.println(decode);
    }

    private static final String AES_KEY = "libcckeylibcckey";
    private static final String AES_IV = "libcciv libcciv ";
    private static final String BLOW_KEY = "3DC5CA39";
    private static final String BLOW_IV = "d9c7c3c8870d64bd";

    public static String encrypt(String plaintext, int version) throws Exception {
        switch (version) {
            case 11:
                return encryptEleven(plaintext);
            case 12:
                return encryptTwelve(plaintext);
            default:
                throw new IllegalArgumentException("Unsupported version");
        }
    }

    public static String decrypt(String ciphertext, int version) throws Exception {
        switch (version) {
            case 11:
                return decryptEleven(ciphertext);
            case 12:
                return decryptTwelve(ciphertext);
            default:
                throw new IllegalArgumentException("Unsupported version");
        }
    }

    private static String encryptEleven(String plaintext) throws Exception {
        byte[] iv = hexStringToByteArray(BLOW_IV);
        byte[] key = hashToBytes(BLOW_KEY);

        int round = plaintext.length() / 8;
        int leftLength = plaintext.length() % 8;
        StringBuilder result = new StringBuilder();
        byte[] currentVector = iv.clone();

        Cipher cipher = Cipher.getInstance("Blowfish/ECB/NoPadding");
        SecretKeySpec secretKeySpec = new SecretKeySpec(key, "Blowfish");
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);

        for (int i = 0; i < round; i++) {
            byte[] block = xorBytes(plaintext.substring(i * 8, (i + 1) * 8).getBytes(), currentVector);
            byte[] temp = cipher.doFinal(block);
            currentVector = xorBytes(currentVector, temp);
            result.append(bytesToHex(temp));
        }

        if (leftLength > 0) {
            currentVector = cipher.doFinal(currentVector);
            byte[] block = xorBytes(plaintext.substring(round * 8).getBytes(), currentVector);
            result.append(bytesToHex(block));
        }

        return result.toString().toUpperCase();
    }

    private static String encryptTwelve(String plaintext) throws Exception {
        byte[] iv = AES_IV.getBytes();
        byte[] key = AES_KEY.getBytes();

        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);

        byte[] result = cipher.doFinal(plaintext.getBytes());
        return bytesToHex(result).toUpperCase();
    }

    private static String decryptEleven(String ciphertext) throws Exception {
        byte[] iv = hexStringToByteArray(BLOW_IV);
        byte[] key = hashToBytes(BLOW_KEY);
        byte[] encrypted = hexStringToByteArray(ciphertext.toLowerCase());

        int round = encrypted.length / 8;
        int leftLength = encrypted.length % 8;
        StringBuilder result = new StringBuilder();
        byte[] currentVector = iv.clone();

        Cipher cipher = Cipher.getInstance("Blowfish/ECB/NoPadding");
        SecretKeySpec secretKeySpec = new SecretKeySpec(key, "Blowfish");
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);

        for (int i = 0; i < round; i++) {
            byte[] block = Arrays.copyOfRange(encrypted, i * 8, (i + 1) * 8);
            byte[] temp = xorBytes(cipher.doFinal(block), currentVector);
            currentVector = xorBytes(currentVector, block);
            result.append(new String(temp));
        }

        if (leftLength > 0) {
            currentVector = cipher.doFinal(currentVector);
            byte[] block = Arrays.copyOfRange(encrypted, round * 8, round * 8 + leftLength);
            result.append(new String(xorBytes(block, currentVector)));
        }

        return result.toString();
    }

    private static String decryptTwelve(String ciphertext) throws Exception {
        byte[] iv = AES_IV.getBytes();
        byte[] key = AES_KEY.getBytes();
        byte[] encrypted = hexStringToByteArray(ciphertext.toLowerCase());

        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);

        byte[] result = cipher.doFinal(encrypted);
        return new String(result);
    }

    private static byte[] xorBytes(byte[] bytes1, byte[] bytes2) {
        byte[] result = new byte[bytes1.length];
        for (int i = 0; i < bytes1.length; i++) {
            result[i] = (byte) (bytes1[i] ^ bytes2[i]);
        }
        return result;
    }

    private static byte[] hexStringToByteArray(String s) {
        int len = s.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                    + Character.digit(s.charAt(i + 1), 16));
        }
        return data;
    }

    private static byte[] hashToBytes(String s) throws Exception {
        return MessageDigest.getInstance("SHA-1").digest(s.getBytes());
    }

    private static String bytesToHex(byte[] bytes) {
        StringBuilder result = new StringBuilder();
        for (byte b : bytes) {
            result.append(String.format("%02X", b));
        }
        return result.toString();
    }
}

 4.使用PHP程序进行解密

PHP在线运行环境：代码在线运行 - 在线工具，进入后选择PHP即可！将以下代码复制到在线运行环境中并把代码中的密码替换为你自己connections.ncx文件中的密码运行即可！

<?php
 
namespace FatSmallTools;
 
class NavicatPassword
{
    protected $version = 0;
    protected $aesKey = 'libcckeylibcckey';
    protected $aesIv = 'libcciv libcciv ';
    protected $blowString = '3DC5CA39';
    protected $blowKey = null;
    protected $blowIv = null;
    
    public function __construct($version = 12)
    {
        $this->version = $version;
        $this->blowKey = sha1('3DC5CA39', true);
        $this->blowIv = hex2bin('d9c7c3c8870d64bd');
    }
    
    public function encrypt($string)
    {
        $result = FALSE;
        switch ($this->version) {
            case 11:
                $result = $this->encryptEleven($string);
                break;
            case 12:
                $result = $this->encryptTwelve($string);
                break;
            default:
                break;
        }
        
        return $result;
    }
    
    protected function encryptEleven($string)
    {
        $round = intval(floor(strlen($string) / 8));
        $leftLength = strlen($string) % 8;
        $result = '';
        $currentVector = $this->blowIv;
        
        for ($i = 0; $i < $round; $i++) {
            $temp = $this->encryptBlock($this->xorBytes(substr($string, 8 * $i, 8), $currentVector));
            $currentVector = $this->xorBytes($currentVector, $temp);
            $result .= $temp;
        }
        
        if ($leftLength) {
            $currentVector = $this->encryptBlock($currentVector);
            $result .= $this->xorBytes(substr($string, 8 * $i, $leftLength), $currentVector);
        }
        
        return strtoupper(bin2hex($result));
    }
    
    protected function encryptBlock($block)
    {
        return openssl_encrypt($block, 'BF-ECB', $this->blowKey, OPENSSL_RAW_DATA|OPENSSL_NO_PADDING); 
    }
    
    protected function decryptBlock($block)
    {
        return openssl_decrypt($block, 'BF-ECB', $this->blowKey, OPENSSL_RAW_DATA|OPENSSL_NO_PADDING); 
    }
    
    protected function xorBytes($str1, $str2)
    {
        $result = '';
        for ($i = 0; $i < strlen($str1); $i++) {
            $result .= chr(ord($str1[$i]) ^ ord($str2[$i]));
        }
        
        return $result;
    }
    
    protected function encryptTwelve($string)
    {
        $result = openssl_encrypt($string, 'AES-128-CBC', $this->aesKey, OPENSSL_RAW_DATA, $this->aesIv);
        return strtoupper(bin2hex($result));
    }
    
    public function decrypt($string)
    {
        $result = FALSE;
        switch ($this->version) {
            case 11:
                $result = $this->decryptEleven($string);
                break;
            case 12:
                $result = $this->decryptTwelve($string);
                break;
            default:
                break;
        }
        
        return $result;
    }
    
    protected function decryptEleven($upperString)
    {
        $string = hex2bin(strtolower($upperString));
        
        $round = intval(floor(strlen($string) / 8));
        $leftLength = strlen($string) % 8;
        $result = '';
        $currentVector = $this->blowIv;
        
        for ($i = 0; $i < $round; $i++) {
            $encryptedBlock = substr($string, 8 * $i, 8);
            $temp = $this->xorBytes($this->decryptBlock($encryptedBlock), $currentVector);
            $currentVector = $this->xorBytes($currentVector, $encryptedBlock);
            $result .= $temp;
        }
        
        if ($leftLength) {
            $currentVector = $this->encryptBlock($currentVector);
            $result .= $this->xorBytes(substr($string, 8 * $i, $leftLength), $currentVector);
        }
        
        return $result;
    }
    
    protected function decryptTwelve($upperString)
    {
        $string = hex2bin(strtolower($upperString));
        return openssl_decrypt($string, 'AES-128-CBC', $this->aesKey, OPENSSL_RAW_DATA, $this->aesIv);
    }
}
 
 
use FatSmallTools\NavicatPassword;
 
//需要指定版本，11或12
$navicatPassword = new NavicatPassword(12);
//$navicatPassword = new NavicatPassword(11);
 
//解密
//$decode = $navicatPassword->decrypt('15057D7BA390');
$decode = $navicatPassword->decrypt('解密密码');
echo $decode."\n";