CookieCloud Fixed IV Decryption - Node.js

This is a Node.js implementation for decrypting CookieCloud's aes-128-cbc-fixed encrypted data using standard Node.js crypto library.

Requirements

• Node.js 12.0.0 or higher
• No external dependencies (uses built-in crypto module)

Installation

cd nodejs
npm install

Usage

Command Line

npm start
# or
node decrypt.js

As Module

const { decrypt } = require('./decrypt.js');

const uuid = 'your-uuid';
const encrypted = 'base64-encrypted-data';
const password = 'your-password';

try {
    const data = decrypt(uuid, encrypted, password);
    console.log('Decrypted data:', data);
} catch (error) {
    console.error('Decryption failed:', error.message);
}

API Integration

const express = require('express');
const { decrypt } = require('./decrypt.js');

const app = express();
app.use(express.json());

app.post('/decrypt', (req, res) => {
    const { uuid, encrypted, password } = req.body;
    
    try {
        const data = decrypt(uuid, encrypted, password);
        res.json({ success: true, data });
    } catch (error) {
        res.status(400).json({ success: false, error: error.message });
    }
});

app.listen(3000, () => {
    console.log('CookieCloud decrypt API running on port 3000');
});

Algorithm Details

• Algorithm: AES-128-CBC
• Key: MD5(uuid + "-" + password).substring(0, 16)
• IV: Fixed 16 bytes of zeros
• Padding: PKCS7
• Encoding: Base64

Performance

• Decryption time: ~1-2ms for typical CookieCloud data
• Memory usage: ~5-10MB
• No external dependencies required