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Sapient.js

Sapient secures your Node.js applications' server-to-server HTTP(S) traffic even in the wake of a TLS security breakdown (compromised certificate authority, etc.).

Sapient allows you to quickly and easily add application-layer cryptography to your API requests and responses.

Features at a Glance

Secure APIs:
- Shared-key encryption
  - XChaCha20-Poly1305
- Shared-key authentication
  - HMAC-SHA512-256
- Anonymous public-key encryption
  - X25519 + BLAKE2b + XChaCha20-Poly1305
- Public-key digital signatures
  - Ed25519
Digital signatures and authentication are backwards-compatible with unsigned JSON API clients and servers
- The signaure and authentication tag will go into HTTP headers, rather than the request/response body.

Installing Sapient

npm install --save sapient

Optional:

Sapient uses Sodium-Plus internally. The default Sodium-Plus backend is cross-platform, but you can obtain greater performance by installing sodium-native too.

npm install --save sodium-native

This isn't strictly necessary, and sodium-native doesn't work in browsers, but if you're not targeting browsers, you can get a significant performance boost.

Basic Usage

See the request-promise documentation.

To use Sapient, you'll simply need to preprocess your options objects.

const rp = require('request-promise-native');
const {Sapient, SigningSecretKey} = require('sapient');

(async function () {
    let sk = await SigningSecretKey.generate();
    let request = {
        'method': 'POST',
        'uri': 'https://example.com',
        'form': {
            'important': 'some value that needs integrity',
            'test': 12345,
            'now': '2019-07-31T09:00:00+00:00'
        }
    };
    let response = await rp(await Sapient.signFormRequest(request, sk));
    console.log(response.statusCode);
    try {
        await Sapient.verifySignedResponse(response, sk.getPublicKey());
    } catch (e) {
        console.log(e.message);
    }
})();

Real World Example

This code will fetch data from the PHP Chronicle, verify the signature, return an object representing the JSON data that we authenticated.

const rp = require('request-promise-native');
const {Sapient, SigningPublicKey} = require('sapient');

(async function () {
    let publicKey = SigningPublicKey.fromString(
        'MoavD16iqe9-QVhIy-ewD4DMp0QRH-drKfwhfeDAUG0='
    );
    let request = {
        'method': 'GET',
        'uri': 'https://php-chronicle.pie-hosted.com/chronicle/lookup/WQG3tH3CiLHg_upN0ABhKiYWOGwH3n9l4pM04bXwG54=',
        'resolveWithFullResponse': true
    };
    let response = await rp(request);
    console.log(await Sapient.decodeSignedJsonResponse(response, publicKey));
})();

This should result in the following (except with differing timestamps):