sidh-legacy

Note

The version of SIDH used in this package is no longer recommended. Instead prefer the latest version, which is currently being evaluated for standardization as a NIST PQC Round 4 candidate. An up-to-date implementation of SIDH is provided by sidh.

Either way, you probably shouldn't use this.

Overview

The SIDH post-quantum asymmetric cypher compiled to WebAssembly using Emscripten. The specific implementation in use is from Microsoft Research. A simple JavaScript wrapper is provided to make SIDH easy to use in web applications.

The parameters are configured to 128-bit strength (SIKEp503).

Example Usage

import {sidh} from 'sidh-legacy';

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

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

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

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

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

Note: SIDH 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 sidh directly for anything important if you lack the experience to do so.