Encrypt or decrypt strings in Node.js

encryptor.js

const crypto = require('crypto');

module.exports = class Encryptor {
    constructor(encryptionKey) {
        this.ENCRYPTION_KEY = encryptionKey.toString();  // Must be 256 bits (32 characters)
        this.IV_LENGTH = 16;  // For AES, this is always 16
    }

    encrypt(text) {
        let iv = crypto.randomBytes(this.IV_LENGTH);
        let cipher = crypto.createCipheriv('aes-256-cbc', new Buffer.from(this.ENCRYPTION_KEY), iv);
        let encrypted = cipher.update(text);
        encrypted = Buffer.concat([encrypted, cipher.final()]);
        return `${iv.toString('hex')}:${encrypted.toString('hex')}`;
    }

    decrypt(encrypted) {
        let encryptedParts = encrypted.split(':');
        let iv = new Buffer.from(encryptedParts.shift(), 'hex');
        let encryptedText = new Buffer.from(encryptedParts.join(':'), 'hex');
        let decipher = crypto.createDecipheriv('aes-256-cbc', new Buffer.from(this.ENCRYPTION_KEY), iv);
        let decrypted = decipher.update(encryptedText);
        decrypted = Buffer.concat([decrypted, decipher.final()]);
        return decrypted.toString();
    }
}

package.json

{
    "name": "encryptor",
    "version": "1.1.0",
    "author": "Garen Yöndem",
    "license": "MIT"
}