RSA-BRIDGE

Encrypted communication bridge between client and server using Node-RSA library.

• Encrypted Communication
• Streamlined Client-Server Integration
• Development simplification
• Key Generation
• Powered by a solid library

The library uses Node-RSA to create a bridge between server-client with encrypted communication, enabling secure end-to-end communication.

Example

RSA Bridge Server Instance

import { RSAServer } from "rsa-bridge";
const rsa = new RSAServer({ bits: 1024 });

app.use(
  rsa.gate((req, res, next) => {
    // your handler functions
  })
);

RSA Bridge Client Instance

import { RSAClient } from "rsa-bridge";
const rsa = new RSAClient({ bits: 1024 });

rsa.connect(PATH);
rsa.fetch(INPUT, OPTIONS);

Installing

npm install rsa-bridge

Testing

npm test

---

Usage

Its use is divided into an client instance (RSAClient) and an server instance (RSAServer). The server instance must expose the public key (publish) and have the middleware (gate) to inject RSA into the handler. The client instance must have the public key exposure endpoint (connect) to encrypt the data.

Instantiating

To instantiate the service on the server it is necessary to specify bits or keys that will be used. Below is an example of instantiating the model used both on the server and on the client

import { BasicRSA } from "rsa-bridge";
const rsa = new BasicRSA(BasicRSAConfig);

• random - BasicRSAConfig - you can generate random keys by entering the bits

{
  bits: number;
}

• custom - BasicRSAConfig - you can specify your keys using the configuration below

{
  keys: {
    private: string,
    public: string,
    ...
  }
}

Client-side

Instantiating

The instance configuration is the same as found here. Although it is possible, a custom key is not recommended for clients.

import { RSAClient } from "rsa-bridge";
const rsa = new RSAClient(BasicRSAConfig);

Connect

Obtains a connection to the server's RSA service, via the endpoint defined for public key exposure. The PATH must point to the address defined here.

rsa.connect(PATH);

Fetch

Execute a request to the server using the encryption bridge.

rsa.fetch(INPUT, OPTIONS).then(({ body, response }) => {
  // decrypted data
});

Server-side

Instantiating

The instance configuration is the same as found here.

import { RSAServer } from "rsa-bridge";
const rsa = new RSAServer(BasicRSAConfig);

Publish

The public key must be exposed for the bridge to work. The method must be GET.

app.get(PATH, rsa.publish);

• path - string - the HTTP path

Gate

It can be used as a middleware, propagating the service to all routes

app.use(rsa.gate);
app.post("example", HANDLER);

It can also be used on a , as in the single path

app.post("/example", rsa.gate(HANDLER));

Getting Data

If the request passed the gate, the data sent in the body can be obtained

app.use(rsa.gate);
app.post("/example", (req, res) => {
  req.body; // decrypted data
});

Send

The send function will be wrapped by the gate to encrypt the data before sending it to the client. Predecessors like .json() and .status() can be used as well.

app.use(rsa.gate);
app.post("/example", (req, res) => {
  res.status(200).send(DATA); // L0SQ23.....
});

The wrapped res will extend throughout the request until the response, even with the use of next() for example.

app.use(rsa.gate);
app.use((req, res, next) => {
  next();
});
app.use((req, res) => {
  res.status(200).json(DATA); // L0SQ23.....
});

Basic RSA Functions

Encrypt

Returns encrypted data as base64

const encrypted = rsa.encrypt(data);

Decrypt

returns decrypted data as utf8

const decrypted = rsa.decrypt(data);

encryptWithKey

returns encrypted data as base64 encrypted with a different key

const encrypted = rsa.encryptWithKey(key, data, format?);

publicKey

exports the node's public key. The default encoding is "UTF8" but can be changed.

const publicKey = rsa.publicKey(KeyFormat, OutputEncoding);

---

ReactJS Example

An example implementation with reactJS is available in examples. There is a live version at https://rsa-bridge.vercel.app