Encryption in Typescript

In this blog, I have used the crypto library to

• Generate random numbers

• Generate Hash

• Encrypt and decrypt data

I have coded for encrypting data using the 'aes-256-cbc' algorithm. In real life, you must encrypt sensitive information like credit card information, secret keys, etc. before storing it in the database. This will prevent the misuse of this sensitive information if the data gets leaked. You will also need a way to decrypt this information when required. In this blog/video, I have written a basic code in typescript to encrypt and decrypt information.

In this video, I have coded using the crypto library in Node.js to encrypt some random text. I dive into crypto in JavaScript and in TypeScript to generate cryptographically safe random numbers, create strong hashes, and securely encrypt sensitive data such as credit card numbers and CVVs. You'll learn how to store this encrypted data in a database and decrypt it when needed.

Discover the use of crypto in a Node.js project, including how to use Node crypto to encrypt and decrypt tokens. Whether you're working on securing emails, sensitive documents, or any kind of private information, this tutorial will guide you through the steps of encryption and decryption using AES and other algorithms.

By the end of this, you’ll know how to encrypt emails, protect your data from hacking, and securely handle sensitive information in your Node.js applications. Plus, I cover practical examples like how to encrypt and decrypt text in JavaScript, and Typescript, and explore topics like initialization vectors, cipher modes, and more.

Generate random numbers

import * as crypto from 'crypto';

// async
crypto.randomBytes(16, (err, buf) => {
 console.log(buf.toString('hex'));
});

// sync
let iv1 = crypto.randomBytes(16); // initialization vector
console.log(iv1.toString('hex'));

Generate hash

let hash = crypto.createHash('md5-sha1').update('code with gd').digest('hex');
console.log(hash);
console.log(crypto.getHashes());

Encrypt data

let iv = crypto.randomBytes(16);
let credit_card = '901445912340985';
let cvv = '725';

// console.log(crypto.getCiphers());

let secret_key = 'n8XIkjtyxtJk80mwstUTEHLPf4gOfLQI'; // store in //configs

let cipher = crypto.createCipheriv('aes-256-cbc', secret_key, iv);
let encrypted_credit_card = cipher.update(credit_card, 'utf-8', 'hex');
encrypted_credit_card += cipher.final('hex');

let cipherCvv = crypto.createCipheriv('aes-256-cbc', secret_key, iv);
let encrypted_cvv = cipherCvv.update(cvv, 'utf-8', 'hex');
encrypted_cvv += cipherCvv.final('hex');

console.log('Encrypted Credit Card Number: ', encrypted_credit_card);
console.log('Encrypted Credit Card CVV: ', encrypted_cvv);

console.log('--------------');

Decrypt Data

// Decipher
let decipher = crypto.createDecipheriv('aes-256-cbc', secret_key, iv);
let decrypted_credit_card = decipher.update(
 encrypted_credit_card,
 'hex',
 'utf-8'
);

decrypted_credit_card += decipher.final('utf8');
let decipherCvv = crypto.createDecipheriv('aes-256-cbc', secret_key, iv);
let decrypted_cvv = decipherCvv.update(encrypted_cvv, 'hex', 'utf-8');

decrypted_cvv += decipherCvv.final('utf8');
console.log('Deciphered Credit Card Number: ', decrypted_credit_card);

console.log('Deciphered Credit Card CVV: ', decrypted_cvv);