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hpke-js

A Hybrid Public Key Encryption (HPKE) module for various JavaScript runtimes

1.2.2
Source
npm

Version published: last year

Weekly downloads: 21K; decreased by-2.58%

Maintainers: 1

Weekly downloads

Created: 3 years ago

Source

hpke-js

A TypeScript Hybrid Public Key Encryption (HPKE) implementation build on top of Web Cryptography API. This module works on web browsers, Node.js, Deno and various other JavaScript runtimes.

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

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

npm install @hpke/core
# if necessary...
npm install @hpke/dhkem-x25519
npm install @hpke/dhkem-x448
npm install @hpke/chacha20poly1305
# ...or you can use the v0.x-compatible all-in-one package below.
npm install hpke-js

Then, you can use it as follows:

import { AeadId, CipherSuite, KdfId, KemId } from "hpke-js";
// const { AeadId, CipherSuite, KdfId, KemId } = require("hpke-js");
// import {
//   Aes128Gcm, CipherSuite, DhkemP256HkdfSha256, HkdfSha256,
// } from "@hpke/core";

async function doHpke() {
  const suite = new CipherSuite({
    kem: KemId.DhkemP256HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.Aes128Gcm,
  });
  // When using "@hpke/core", specify the cryptographic algorithm instances
  // as follows, instead of identities above.
  // const suite = new CipherSuite({
  //   kem: new DhkemP256HkdfSha256(),
  //   kdf: new HkdfSha256(),
  //   aead: new Aes128Gcm(),
  // });

  // A recipient generates a key pair.
  const rkp = await suite.kem.generateKeyPair();

  // A sender encrypts a message with the recipient public key.
  const sender = await suite.createSenderContext({
    recipientPublicKey: rkp.publicKey,
  });
  const ct = await sender.seal(new TextEncoder().encode("Hello world!"));

  // The recipient decrypts it.
  const recipient = await suite.createRecipientContext({
    recipientKey: rkp.privateKey,
    enc: sender.enc,
  });
  const pt = await recipient.open(ct);

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

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

Index

Packages
Supported Features
Supported Environments
Warnings and Restrictions
Installation
Usage
- Base mode - for web browsers, Node.js and Deno.
- Base mode with Single-Shot APIs
- Base mode with export-only AEAD
- PSK mode
- Auth mode
- AuthPSK mode
Contributing
References

Packages

The hpke-js includes the following packages.

name	since	description
hpke-js	v0.1.0-	The HPKE module supporting all of the ciphersuites defined in RFC9180, which consists of the following @hpke/{core, dhkem-x25519, dhkem-x448, chacha20poly1305} internally.
@hpke/core	v1.0.0-	The HPKE core module implemented using only Web Cryptography API. It does not support the X25519/X448-based KEMs and the ChaCha20/Poly1305 AEAD, but it has no external module dependencies. It's small in size and tree-shaking friendly. See /core/README.
@hpke/chacha20poly1305	v1.0.0-	The HPKE module extension for ChaCha20Poly1305 AEAD. See /x/chacha20poly1305/README.
@hpke/dhkem-x25519	v1.0.0-	The HPKE module extension for DHKEM(X25519, HKDF-SHA256). See /x/dhkem-x25519/README.
@hpke/dhkem-x448	v1.0.0-	The HPKE module extension for DHKEM(X448, HKDF-SHA512). See /x/dhkem-x448/README.
@hpke/hybridkem-x25519-kyber768	v1.2.1-	EXPERIMENTAL AND NOT STANDARDIZED The HPKE module extension for the hybrid post-quantum KEM currently named X25519Kyber768Draft00. See /x/hybridkem-x25519-kyber768/README.
@hpke/dhkem-secp256k1	v1.0.0-	EXPERIMENTAL AND NOT STANDARDIZED The HPKE module extension for DHKEM(secp256k1, HKDF-SHA256). See /x/dhkem-secp256k1/README.

Supported Features

HPKE Modes

Base	PSK	Auth	AuthPSK
✅	✅	✅	✅

Key Encapsulation Machanisms (KEMs)

KEMs	Browser	Node.js	Deno	Cloudflare Workers	bun
DHKEM (P-256, HKDF-SHA256)	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core
DHKEM (P-384, HKDF-SHA384)	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core
DHKEM (P-521, HKDF-SHA512)	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core		✅ hpke-js @hpke/core	✅ hpke-js @hpke/core
DHKEM (X25519, HKDF-SHA256)	✅ hpke-js @hpke/dhkem-x25519	✅ hpke-js @hpke/dhkem-x25519	✅ hpke-js @hpke/dhkem-x25519	✅ hpke-js @hpke/dhkem-x25519	✅ hpke-js @hpke/dhkem-x25519
DHKEM (X448, HKDF-SHA512)	✅ hpke-js @hpke/dhkem-x448	✅ hpke-js @hpke/dhkem-x448	✅ hpke-js @hpke/dhkem-x448	✅ hpke-js @hpke/dhkem-x448	✅ hpke-js @hpke/dhkem-x448
Hybrid KEM (X25519, Kyber768)	✅ @hpke/hybridkem-x25519-kyber768	✅ @hpke/hybridkem-x25519-kyber768	✅ @hpke/hybridkem-x25519-kyber768	✅ @hpke/hybridkem-x25519-kyber768	✅ @hpke/hybridkem-x25519-kyber768
DHKEM (secp256k1, HKDF-SHA256)	✅ @hpke/dhkem-secp256k1	✅ @hpke/dhkem-secp256k1	✅ @hpke/dhkem-secp256k1	✅ @hpke/dhkem-secp256k1	✅ @hpke/dhkem-secp256k1

Key Derivation Functions (KDFs)

KDFs	Browser	Node.js	Deno	Cloudflare Workers	bun
HKDF-SHA256	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)
HKDF-SHA384	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)
HKDF-SHA512	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)	✅ hpke-js @hpke/core(*1)

(*1) The HKDF functions built in @hpke/core can derive keys of the same length as the hash size. If you want to derive keys longer than the hash size, use hpke-js.

Authenticated Encryption with Associated Data (AEAD) Functions

AEADs	Browser	Node.js	Deno	Cloudflare Workers	bun
AES-128-GCM	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core
AES-256-GCM	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core
ChaCha20 Poly1305	✅ hpke-js @hpke/chacha 20poly1305	✅ hpke-js @hpke/chacha 20poly1305	✅ hpke-js @hpke/chacha 20poly1305	✅ hpke-js @hpke/chacha 20poly1305	✅ hpke-js @hpke/chacha 20poly1305
Export Only	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core	✅ hpke-js @hpke/core

Supported Environments

Web Browser: Web Cryptography API supported browsers
- Confirmed: Chrome, Firefox, Edge, Safari, Opera, Vivaldi, Brave
Node.js: 16.x, 17.x, 18.x, 19.x, 20.x
Deno: 1.x (1.25-)
Cloudflare Workers
bun: 0.x (0.4.0-)

Warnings and Restrictions

Although this library has been passed the following test vectors, it has not been formally audited.
- RFC9180 official test vectors provided on github.com/cfrg/draft-irtf-cfrg-hpke
- ECDH/X25519/X448 test vectors provided on Project Wycheproof
The upper limit of the AEAD sequence number is further rounded to JavaScript's MAX_SAFE_INTEGER (2^53-1).

Installation

Node.js

Using npm:

npm install @hpke/core
# if necessary...
npm install @hpke/dhkem-x25519
npm install @hpke/dhkem-x448
npm install @hpke/chacha20poly1305
# ...or you can use the v0.x-compatible all-in-one package below.
npm install hpke-js

Using yarn:

yarn add @hpke/core
# if necessary...
yarn add @hpke/dhkem-x25519
yarn add @hpke/dhkem-x448
yarn add @hpke/chacha20poly1305
# ...or you can use the v0.x-compatible all-in-one package below.
yarn add hpke-js

Deno

Using deno.land:

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

// use the latest stable version
import * as hpke from "https://deno.land/x/hpke/mod.ts";
// import * as hpke from "https://deno.land/x/hpke/core/mod.ts";
// import * as hpke from "https://deno.land/x/hpke/x/dhkem-x25519/mod.ts";

Web Browsers

Followings are how to use the 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-js@1.2.2";
  // import * as hpke from "https://esm.sh/@hpke/core@1.2.2";
  // ...
</script>

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

Using unpkg:

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

Cloudflare Workers

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

# for @hpke/core
cd hpke-js/core
npm install -g esbuild
deno task dnt
deno task minify > $YOUR_SRC_PATH/hpke-core.js

# for @hpke/dhkem-x25519
cd hpke-js/x/dhkem-x25519
npm install -g esbuild
deno task dnt
deno task minify > $YOUR_SRC_PATH/hpke-dhkem-x25519.js

Usage

This section shows some typical usage examples.

Base mode

Node.js:

import { AeadId, CipherSuite, KdfId, KemId } from "hpke-js";
// const { AeadId, CipherSuite, KdfId, KemId } = require("hpke-js");
// import {
//   Aes128Gcm, CipherSuite, DhkemP256HkdfSha256, HkdfSha256,
// } from "@hpke/core";

async function doHpke() {
  const suite = new CipherSuite({
    kem: KemId.DhkemP256HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.Aes128Gcm,
  });

  // A recipient generates a key pair.
  const rkp = await suite.kem.generateKeyPair();

  // A sender encrypts a message with the recipient public key.
  const sender = await suite.createSenderContext({
    recipientPublicKey: rkp.publicKey,
  });
  const ct = await sender.seal(new TextEncoder().encode("Hello world!"));

  // The recipient decrypts it.
  const recipient = await suite.createRecipientContext({
    recipientKey: rkp.privateKey,
    enc: sender.enc,
  });
  const pt = await recipient.open(ct);

  // Hello world!
  console.log("decrypted: ", new TextDecoder().decode(pt));
}

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

Deno:

import { AeadId, CipherSuite, KdfId, KemId } from "https://deno.land/x/hpke@1.2.2/mod.ts";
// import {
//   Aes128Gcm, CipherSuite, HkdfSha256,
// } from "https://deno.land/x/hpke@1.2.2/core/mod.ts";
// import { DhkemX25519HkdfSha256 } from "https://deno.land/x/hpke@1.2.2/x/dhkem-x25519/mod.ts";

async function doHpke() {
  // setup
  const suite = new CipherSuite({
    // When using "https://deno.land/x/hpke/mod.ts" (not "/x/hpke/core/mod.ts"),
    // you can specify the identifier as follows:
    kem: KemId.DhkemX25519HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.Aes128Gcm,
  });
  // When using hpke/core/mod.ts, specify the instances as follows:
  const suite = new CipherSuite({
    kem: new DhkemX25519HkdfSha256(),
    kdf: new HkdfSha256(),
    aead: new Aes128Gcm(),
  });

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

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

  // A JWK-formatted recipient public key can also be used.
  // const jwkPkR = {
  //   kty: "EC",
  //   crv: "P-256",
  //   kid: "P-256-01",
  //   x: "-eZXC6nV-xgthy8zZMCN8pcYSeE2XfWWqckA2fsxHPc",
  //   y: "BGU5soLgsu_y7GN2I3EPUXS9EZ7Sw0qif-V70JtInFI",
  //   key_ops: [],
  // };
  // const pkR = await suite.kem.importKey("jwk", jwkPkR, true);
  // const sender = await suite.createSenderContext({
  //   recipientPublicKey: pkR,
  // });

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

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

  // A JWK-formatted recipient private key can also be used.
  // const jwkSkR = {
  //   kty: "EC",
  //   crv: "P-256",
  //   kid: "P-256-01",
  //   x: "-eZXC6nV-xgthy8zZMCN8pcYSeE2XfWWqckA2fsxHPc",
  //   y: "BGU5soLgsu_y7GN2I3EPUXS9EZ7Sw0qif-V70JtInFI",
  //   d: "kwibx3gas6Kz1V2fyQHKSnr-ybflddSjN0eOnbmLmyo",
  //   key_ops: ["deriveBits"],
  // };
  // const skR = await suite.kem.importKey("jwk", jwkSkR, false);
  // const recipient = await suite.createRecipientContext({
  //   recipientKey: skR,
  //   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 { AeadId, CipherSuite, KdfId, KemId } from "https://esm.sh/hpke-js@1.2.2";
      // import {
      //   Aes128Gcm, CipherSuite, DhkemP256HkdfSha256, HkdfSha256,
      // } from "@hpke/core@1.2.2";

      globalThis.doHpke = async () => {
        try {
          const suite = new CipherSuite({
            kem: KemId.DhkemP256HkdfSha256,
            kdf: KdfId.HkdfSha256,
            aead: AeadId.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>

Base mode with Single-Shot APIs

Node.js:

import { AeadId, CipherSuite, KdfId, KemId } from "hpke-js";
// const { AeadId, CipherSuite, KdfId, KemId } = require("hpke-js");
// import {
//   Aes128Gcm, CipherSuite, DhkemP256HkdfSha256, HkdfSha256,
// } from "@hpke/core";

async function doHpke() {

  // setup
  const suite = new CipherSuite({
    kem: KemId.DhkemP256HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.Aes128Gcm
  });

  const rkp = await suite.kem.generateKeyPair();
  const pt = new TextEncoder().encode('Hello world!'),

  // encrypt
  const { ct, enc } = await suite.seal({ recipientPublicKey: rkp.publicKey }, pt);

  // decrypt
  const pt = await suite.open({ recipientKey: rkp.privateKey, enc: enc }, ct);

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

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

Base mode with export-only AEAD

Node.js:

import { AeadId, CipherSuite, KdfId, KemId } from "hpke-js";
// const { AeadId, CipherSuite, KdfId, KemId } = require("hpke-js");
// import {
//   CipherSuite, DhkemP256HkdfSha256, ExportOnly, HkdfSha256,
// } from "@hpke/core";

async function doHpke() {
  // setup
  const suite = new CipherSuite({
    kem: KemId.DhkemP256HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.ExportOnly,
  });
  // When using "@hpke/core",
  const suite = new CipherSuite({
    kem: new DhkemP256HkdfSha256(),
    kdf: new HkdfSha256(),
    aead: new ExportOnly(),
  });

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

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

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

  const te = new TextEncoder();

  // export
  const pskS = sender.export(te.encode("jugemujugemu"), 32);
  const pskR = recipient.export(te.encode("jugemujugemu"), 32);
  // pskR === pskS
}

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

PSK mode

Node.js:

import { AeadId, CipherSuite, KdfId, KemId } from "hpke-js";
// const { AeadId, CipherSuite, KdfId, KemId } = require("hpke-js");
// import {
//   Aes128Gcm, CipherSuite, DhkemP256HkdfSha256, HkdfSha256,
// } from "@hpke/core";

async function doHpke() {
  // setup
  const suite = new CipherSuite({
    kem: KemId.DhkemP256HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.Aes128Gcm,
  });

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

  const sender = await suite.createSenderContext({
    recipientPublicKey: rkp.publicKey,
    psk: {
      id: new TextEncoder().encode("our-pre-shared-key-id"),
      // a PSK MUST have at least 32 bytes.
      key: new TextEncoder().encode("jugemujugemugokounosurikirekaija"),
    },
  });

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

  const recipient = await suite.createRecipientContext({
    recipientKey: rkp.privateKey,
    enc: sender.enc,
    psk: {
      id: new TextEncoder().encode("our-pre-shared-key-id"),
      // a PSK MUST have at least 32 bytes.
      key: new TextEncoder().encode("jugemujugemugokounosurikirekaija"),
    },
  });

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

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

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

Auth mode

Node.js:

import { AeadId, CipherSuite, KdfId, KemId } from "hpke-js";
// const { AeadId, CipherSuite, KdfId, KemId } = require("hpke-js");
// import {
//   Aes128Gcm, CipherSuite, DhkemP256HkdfSha256, HkdfSha256,
// } from "@hpke/core";

async function doHpke() {
  // setup
  const suite = new CipherSuite({
    kem: KemId.DhkemP256HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.Aes128Gcm,
  });

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

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

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

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

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

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

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

AuthPSK mode

Node.js:

import { AeadId, CipherSuite, KdfId, KemId } from "hpke-js";
// const { AeadId, CipherSuite, KdfId, KemId } = require("hpke-js");
// import {
//   Aes128Gcm, CipherSuite, DhkemP256HkdfSha256, HkdfSha256,
// } from "@hpke/core";

async function doHpke() {
  // setup
  const suite = new CipherSuite({
    kem: KemId.DhkemP256HkdfSha256,
    kdf: KdfId.HkdfSha256,
    aead: AeadId.Aes128Gcm,
  });

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

  const sender = await suite.createSenderContext({
    recipientPublicKey: rkp.publicKey,
    senderKey: skp,
    psk: {
      id: new TextEncoder().encode("our-pre-shared-key-id"),
      // a PSK MUST have at least 32 bytes.
      key: new TextEncoder().encode("jugemujugemugokounosurikirekaija"),
    },
  });

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

  const recipient = await suite.createRecipientContext({
    recipientKey: rkp.privateKey,
    enc: sender.enc,
    senderPublicKey: skp.publicKey,
    psk: {
      id: new TextEncoder().encode("our-pre-shared-key-id"),
      // a PSK MUST have at least 32 bytes.
      key: new TextEncoder().encode("jugemujugemugokounosurikirekaija"),
    },
  });

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

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

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

Contributing

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

References

Keywords

FAQs

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Package last updated on 20 Aug 2023

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Install

hpke-js

hpke-js

Index

Packages

Supported Features

HPKE Modes

Key Encapsulation Machanisms (KEMs)

Key Derivation Functions (KDFs)

Authenticated Encryption with Associated Data (AEAD) Functions

Supported Environments

Warnings and Restrictions

Installation

Node.js

Deno

Web Browsers

Cloudflare Workers

Usage

Base mode

Base mode with Single-Shot APIs

Base mode with export-only AEAD

PSK mode

Auth mode

AuthPSK mode

Contributing

References

Keywords

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