Crystals-kyber-js NPM

This module is based on ntontutoveanu/crystals-kyber-javascript, but includes the following improvements:

✅ Available on various JavaScript runtimes: Browsers, Node.js, Deno, Cloudflare Workers, etc.
✅ Written in TypeScript.
✅ Deterministic key generation support.
✅ Constant-time validation for ciphertext.
✅ Better performance: 1.4 to 1.8 times faster than the original implementation.
✅ Tree-shaking friendly.

For Node.js, you can install crystals-kyber-js via npm/yarn:

npm install crystals-kyber-js

Then, you can use it as follows:

import { Kyber768 } from "crystals-kyber-js";

async function doKyber() {
  // A recipient generates a key pair.
  const recipient = new Kyber768(); // Kyber512 and Kyber1024 are also available.
  const [pkR, skR] = await recipient.generateKeyPair();
  //// Deterministic key generation is also supported
  // const seed = new Uint8Array(64);
  // globalThis.crypto.getRandomValues(seed); // node >= 19
  // const [pkR, skR] = await recipient.deriveKeyPair(seed);

  // A sender generates a ciphertext and a shared secret with pkR.
  const sender = new Kyber768();
  const [ct, ssS] = await sender.encap(pkR);

  // The recipient decapsulates the ciphertext and generates the same shared secret with skR.
  const ssR = await recipient.decap(ct, skR);

  // ssS === ssR
  return;
}

try {
  doKyber();
} catch (err) {
  console.log("failed: ", err.message);
}

Index

Installation

Node.js

Using npm:

npm install crystals-kyber-js

Using yarn:

yarn add crystals-kyber-js

Deno

Using deno.land:

// use a specific version
import { Kyber768 } from "https://deno.land/x/crystals_kyber@1.1.1/mod.ts";

// use the latest stable version
import { Kyber768 } from "https://deno.land/x/crystals_kyber/mod.ts";

Web Browsers

Followings are how to use this module with typical CDNs. Other CDNs can be used as well.

Using esm.sh:

<!-- use a specific version -->
<script type="module">
  import { Kyber768 } from "https://esm.sh/crystals-kyber-js@1.1.1";
  // ...
</script>

<!-- use the latest stable version -->
<script type="module">
  import { Kyber768 } from "https://esm.sh/crystals-kyber-js";
  // ...
</script>

Using unpkg:

<!-- use a specific version -->
<script type="module">
  import { Kyber768 } from "https://unpkg.com/crystals-kyber-js@1.1.1";
  // ...
</script>

Cloudflare Workers

git clone git@github.com:dajiaji/crystals-kyber-js.git
cd crystals-kyber-js
npm install -g esbuild
deno task dnt
deno task minify > $YOUR_SRC_PATH/crystals-kyber.js

Usage

This section shows some typical usage examples.

Node.js

import { Kyber768 } from "crystals-kyber-js";
// const { Kyber768 } = require("crystals-kyber-js");

async function doKyber() {
  const recipient = new Kyber768();
  const [pkR, skR] = await recipient.generateKeyPair();

  const sender = new Kyber768();
  const [ct, ssS] = await sender.encap(pkR);

  const ssR = await recipient.decap(ct, skR);

  // ssS === ssR
  return;
}

try {
  doKyber();
} catch (err) {
  console.log("failed: ", err.message);
}

Deno

import { Kyber512 } from "https://deno.land/x/crystals_kyber@1.1.1/mod.ts";

async function doKyber() {

  const recipient = new Kyber512();
  const [pkR, skR] = await recipient.generateKeyPair();

  const sender = new Kyber512();
  const [ct, ssS] = await sender.encap(pkR);

  const ssR = await recipient.decap(ct, skR);

  // ssS === ssR
  return;
}

try {
  doKyber();
} catch (_err: unknown) {
  console.log("failed.");
}

Browsers

<html>
  <head></head>
  <body>
    <script type="module">
      import { Kyber1024 } from "https://esm.sh/crystals-kyber@1.1.1";

      globalThis.doKyber = async () => {
        try {
          const recipient = new Kyber1024();
          const [pkR, skR] = await recipient.generateKeyPair();

          const sender = new Kyber1024();
          const [ct, ssS] = await sender.encap(pkR);

          const ssR = await recipient.decap(ct, skR);

          // ssS === ssR
          return;
        } catch (err) {
          alert("failed: ", err.message);
        }
      }
    </script>
    <button type="button" onclick="doKyber()">do CRYSTALS-KYBER</button>
  </body>
</html>