encrypt-rsaProtect your data. Keep your code simple.

RSA encryption, authenticated JSON, and signed messages with one async API for Node.js and browsers.

Get started

Explore the API

One API, two runtimes

Use native Node crypto on the server and Web Crypto in the browser. Share keys, payloads, and TypeScript types.

Runtime compatibility

Small strings to structured data

Encrypt short text with RSA-OAEP, larger data with AES-256-GCM, and strict JSON with resource limits and schema validation.

JSON encryption

Verify who sent it

RSA-PSS signatures and scoped messages with expiry, trusted key resolution, and an atomic replay protection callback.

Signed messages

Zero runtime dependencies

Platform cryptography powers the core package. AI SDK recipes live in a separate example app you can adapt to your storage.

AI integration recipes

From install to encrypted JSON

bash

npm install encrypt-rsa

import NodeRSA from 'encrypt-rsa';

const rsa = new NodeRSA();
const { publicKey, privateKey } = await rsa.createPrivateAndPublicKeys(2048);

const text = await rsa.encryptJSON({
  value: { message: 'Hello, العربية 😀' },
  publicKey,
});
const value = await rsa.decryptJSON({ text, privateKey });

JSON uses authenticated v1 hybrid encryption with RSA-OAEP/SHA-256. Keep private keys in trusted application storage and validate decrypted data before using it.

Follow the setup guide → · Read the complete API →