Introduction to Node-RSA

Node-RSA is a widely-used library for RSA encryption and decryption in Node.js. It offers a plethora of APIs for key generation, encryption, decryption, signing, and verification, making it a robust choice for implementing security in your Node.js applications.

Generating RSA Keys

First, let’s see how to generate RSA keys using Node-RSA.

 const NodeRSA = require('node-rsa'); const key = new NodeRSA({b: 512});
console.log(key.exportKey('public')); console.log(key.exportKey('private')); 

Encrypting Data

Encrypting data with Node-RSA is straightforward. Here’s an example:

 const text = 'Hello RSA!'; const encrypted = key.encrypt(text, 'base64'); console.log(encrypted); 

Decrypting Data

Decrypting data is equally simple:

 const decrypted = key.decrypt(encrypted, 'utf8'); console.log(decrypted); 

Signing Data

Node-RSA allows you to sign data for integrity checks:

 const sign = key.sign(text, 'base64'); console.log(sign); 

Verifying Data

Verifying the signed data to ensure its integrity:

 const isVerified = key.verify(text, sign, 'utf8', 'base64'); console.log(isVerified); 

Exporting Keys

You can also export the keys in various formats:

 const privateKey = key.exportKey('pkcs1-private-pem'); const publicKey = key.exportKey('pkcs8-public-pem');
console.log(privateKey); console.log(publicKey); 

Example Application

Now, let’s build a simple application that uses these APIs for data encryption and decryption.

 const express = require('express'); const bodyParser = require('body-parser'); const NodeRSA = require('node-rsa');
const app = express(); const key = new NodeRSA({b: 512});
app.use(bodyParser.json());
app.post('/encrypt', (req, res) => {
 const { data } = req.body;
 const encrypted = key.encrypt(data, 'base64');
 res.send({ encrypted });
});
app.post('/decrypt', (req, res) => {
 const { encryptedData } = req.body;
 const decrypted = key.decrypt(encryptedData, 'utf8');
 res.send({ decrypted });
});
app.listen(3000, () => {
 console.log('Server is running on port 3000');
}); 

This example demonstrates a simple Express server with endpoints for encrypting and decrypting data using Node-RSA.

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