ntru-legacy

Note

The variant of NTRU used in this package is no longer recommended. Instead prefer NTRU Prime, which is a more robust alternative that was a NIST PQC Round 3 alternate candidate. An implementation of NTRU Prime is provided by ntru.

That being said, unless you specifically require NTRU, Kyber should be preferred. Kyber is a NIST PQC winner that has been selected for standardization, and works similarly to NTRU (both being lattice-based). An implementation of Kyber is provided by kyber-crystals.

Overview

The NTRU post-quantum asymmetric cypher compiled to WebAssembly using Emscripten. A simple JavaScript wrapper is provided to make NTRU easy to use in web applications.

The default parameter set is EES743EP1 (roughly 256-bit strength, as per NTRU's documentation).

Example Usage

import {ntru} from 'ntru-legacy';

const keyPair /*: {privateKey: Uint8Array; publicKey: Uint8Array} */ =
	await ntru.keyPair()
;

const plaintext /*: Uint8Array */ =
	new Uint8Array([104, 101, 108, 108, 111, 0]) // "hello"
;

const encrypted /*: Uint8Array */ =
	await ntru.encrypt(plaintext, keyPair.publicKey)
;

const decrypted /*: Uint8Array */ =
	await ntru.decrypt(encrypted, keyPair.privateKey) // same as plaintext
;

console.log(keyPair);
console.log(plaintext);
console.log(encrypted);
console.log(decrypted);

Note: NTRU is a low-level cryptographic primitive, not a high-level construct like libsodium's crypto_box. This module can be combined with a symmetric cypher and a MAC to provide such a construct, but you should avoid using ntru directly for anything important if you lack the experience to do so.