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const crypto = require('crypto');

// Encryption function
function encrypt(text, key, iv) {
    let cipher = crypto.createCipheriv('aes-256-cbc', Buffer.from(key), iv);
    let encrypted = cipher.update(text);
    encrypted = Buffer.concat([encrypted, cipher.final()]);
    return encrypted.toString('hex');
}

// Decryption function
function decrypt(text, key, iv) {
    let encryptedText = Buffer.from(text, 'hex');
    let decipher = crypto.createDecipheriv('aes-256-cbc', Buffer.from(key), iv);
    let decrypted = decipher.update(encryptedText);
    decrypted = Buffer.concat([decrypted, decipher.final()]);
    return decrypted.toString();
}

// Example usage
const key = crypto.randomBytes(32); // Key should be 32 bytes for aes-256-cbc
const iv = crypto.randomBytes(16); // Initialization vector should be 16 bytes

const longString = "Your long string here...";
const encryptedString = encrypt(longString, key, iv);
console.log('Encrypted:', encryptedString);

const decryptedString = decrypt(encryptedString, key, iv);
console.log('Decrypted:', decryptedString);