@hpke/hybridkem-x25519-kyber768

@hpke/hybridkem-x25519-kyber768

A TypeScript Hybrid Public Key Encryption (HPKE) module extension for the hybrid post-quantum KEM(X25519, Kyber768) compliant with X25519Kyber768Draft00 hybrid post-quantum KEM for HPKE. The kyber implementation included in this module is based on ntontutoveanu/crystals-kyber-javascript published under the MIT license. Note that this module is EXPERIMENTAL and the referred specification has not been standardized yet.

Documentation: deno.land | pages (only for the latest ver.)

Index

• Installation
  • Node.js
  • Deno
  • Web Browsers
  • Cloudflare Workers
• Usage
• Contributing

Installation

Node.js

Using npm:

npm install @hpke/hybridkem-x25519-kyber768

Using yarn:

yarn add @hpke/hybridkem-x25519-kyber768

Deno

Using deno.land:

// use a specific version
import * as hpke from "https://deno.land/x/hpke@1.2.2/core/mod.ts";
import * as kyber from "https://deno.land/x/hpke@1.2.2/x/hybridkem-x25519-kyber768/mod.ts";

// use the latest stable version
import * as hpke from "https://deno.land/x/hpke/core/mod.ts";
import * as kyber from "https://deno.land/x/hpke/x/hybridkem-x25519-kyber768/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 * as hpke from "https://esm.sh/@hpke/core@1.2.2";
  import * as kyber from "https://esm.sh/@hpke/hybridkem-x25519-kyber768@1.2.2";
  // ...
</script>

<!-- use the latest stable version -->
<script type="module">
  import * as hpke from "https://esm.sh/@hpke/core";
  import * as kyber from "https://esm.sh/@hpke/hybridkem-x25519-kyber768";
  // ...
</script>

Using unpkg:

<!-- use a specific version -->
<script type="module">
  import * as hpke from "https://unpkg.com/@hpke/core@1.2.2/esm/mod.js";
  import * as kyber from "https://unpkg.com/@hpke/hybridkem-x25519-kyber768@1.2.2/esm/mod.js";
  // ...
</script>

Cloudflare Workers

git clone [e-mail]:dajiaji/hpke-js.git
cd hpke-js/x/hybridkem-x25519-kyber768
npm install -g esbuild
deno task dnt
deno task minify > $YOUR_SRC_PATH/hpke-hybridkem-x25519-kyber768.js

Usage

This section shows some typical usage examples.

Node.js

import { Aes128Gcm, CipherSuite, HkdfSha256 } from "@hpke/core";
import { HybridkemX25519Kyber768 } from "@hpke/hybridkem-x25519-kyber768";
// const { HybridkemX25519Kyber768 } = require("@hpke/hybridkem-x25519-kyber768");

async function doHpke() {
  // setup
  const suite = new CipherSuite({
    kem: new HybridkemX25519Kyber768(),
    kdf: new HkdfSha256(),
    aead: new Aes128Gcm(),
  });

  const rkp = await suite.kem.generateKeyPair();

  const sender = await suite.createSenderContext({
    recipientPublicKey: rkp.publicKey,
  });

  // encrypt
  const ct = await sender.seal(new TextEncoder().encode("Hello world!"));

  const recipient = await suite.createRecipientContext({
    recipientKey: rkp.privateKey,
    enc: sender.enc,
  });

  // decrypt
  const pt = await recipient.open(ct);

  // Hello world!
  console.log(new TextDecoder().decode(pt));
}

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

Deno

import { Aes128Gcm, CipherSuite, HkdfSha256 } from "https://deno.land/x/hpke@1.2.2/core/mod.ts";
import { HybridkemX25519Kyber768 } from "https://deno.land/x/hpke@1.2.2/x/hybridkem-x25519-kyber768/mod.ts";

async function doHpke() {
  // setup
  const suite = new CipherSuite({
    kem: new HybridkemX25519Kyber768(),
    kdf: new HkdfSha256(),
    aead: new Aes128Gcm(),
  });

  const rkp = await suite.kem.generateKeyPair();

  const sender = await suite.createSenderContext({
    recipientPublicKey: rkp.publicKey,
  });

  // encrypt
  const ct = await sender.seal(new TextEncoder().encode("Hello world!"));

  const recipient = await suite.createRecipientContext({
    recipientKey: rkp.privateKey,
    enc: sender.enc,
  });

  // decrypt
  const pt = await recipient.open(ct);

  // Hello world!
  console.log(new TextDecoder().decode(pt));
}

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

Browsers

<html>
  <head></head>
  <body>
    <script type="module">
      import { Aes128Gcm, CipherSuite, HkdfSha256 } from "https://esm.sh/@hpke/core@1.2.2";
      import { HybridkemX25519Kyber768 } from "https://esm.sh/@hpke/hybridkem-x25519-kyber768@1.2.2";

      globalThis.doHpke = async () => {
        try {
          const suite = new CipherSuite({
            kem: new HybridkemX25519Kyber768(),
            kdf: new HkdfSha256(),
            aead: new Aes128Gcm(),
          });
 
          const rkp = await suite.kem.generateKeyPair();
      
          const sender = await suite.createSenderContext({
            recipientPublicKey: rkp.publicKey
          });
          // encrypt
          const ct = await sender.seal(new TextEncoder().encode("Hello world!"));
      
          const recipient = await suite.createRecipientContext({
            recipientKey: rkp.privateKey, // rkp (CryptoKeyPair) is also acceptable.
            enc: sender.enc,
          });

          // decrypt
          const pt = await recipient.open(ct);

          // Hello world!
          alert(new TextDecoder().decode(pt));
        } catch (err) {
          alert("failed:", err.message);
        }
      }
    </script>
    <button type="button" onclick="doHpke()">do HPKE</button>
  </body>
</html>

Contributing

We welcome all kind of contributions, filing issues, suggesting new features or sending PRs.

Changelog

Version 1.2.2

Released 2023-08-20

• (#273) Add docstring for tsdoc.
• (#272) Refactor kyber.
• (#271) Introduce constantTimeCompare to kyber.
• (#270) Update loadSubtleCrypto/loadCrypto.