refactor: tagLen as parameter

src/crypto.ts

@@ -1,4 +1,4 @@
-import { ChaCha20Poly1305, TAG_LENGTH } from "@stablelib/chacha20poly1305";
+import { ChaCha20Poly1305 } from "@stablelib/chacha20poly1305";
 import { Hash } from "@stablelib/hash";
 import { HKDF as hkdf } from "@stablelib/hkdf";
 import { hash } from "@stablelib/sha256";
@@ -10,8 +10,6 @@ import type { KeyPair } from "./@types/keypair.js";
 
 export const Curve25519KeySize = x25519.PUBLIC_KEY_LENGTH;
 
-export const ChachaPolyTagLen = TAG_LENGTH;
-
 /**
  * Generate hash using SHA2-256
  * @param data data to hash

src/index.spec.ts

@@ -8,7 +8,7 @@ import { Handshake, HandshakeStepResult } from "./handshake";
 import { MessageNametagBuffer, MessageNametagLength } from "./messagenametag";
 import { CipherState, createEmptyKey, SymmetricState } from "./noise";
 import { MAX_NONCE, Nonce } from "./nonce";
-import { NoiseHandshakePatterns } from "./patterns";
+import { NoiseHandshakePatterns, PayloadV2ProtocolIDs } from "./patterns";
 import { PayloadV2 } from "./payload";
 import { ChaChaPolyCipherState, NoisePublicKey } from "./publickey";
 
@@ -38,13 +38,15 @@ function randomNoisePublicKey(): NoisePublicKey {
 function randomPayloadV2(rng: HMACDRBG): PayloadV2 {
   const messageNametag = randomBytes(MessageNametagLength, rng);
   const protocolId = 14;
+  const protocolName = Object.keys(PayloadV2ProtocolIDs).find((key) => PayloadV2ProtocolIDs[key] === protocolId);
+  const handshakePattern = NoiseHandshakePatterns[protocolName!];
   const handshakeMessage = [randomNoisePublicKey(), randomNoisePublicKey(), randomNoisePublicKey()];
   const transportMessage = randomBytes(128);
-  return new PayloadV2(messageNametag, protocolId, handshakeMessage, transportMessage);
+  return new PayloadV2(messageNametag, protocolId, handshakePattern.tagLen, handshakeMessage, transportMessage);
 }
 
 describe("js-noise", () => {
-  const rng = new HMACDRBG();
+  const rng = new HMACDRBG(undefined);
 
   it("ChaChaPoly Encryption/Decryption: random byte sequences", function () {
     const cipherState = randomChaChaPolyCipherState(rng);
@@ -241,7 +243,7 @@ describe("js-noise", () => {
 
   it("Noise State Machine: Cipher State primitives", function () {
     // We select one supported handshake pattern and we initialize a symmetric state
-    const hsPattern = NoiseHandshakePatterns.XX;
+    const hsPattern = NoiseHandshakePatterns.Noise_XX_25519_ChaChaPoly_SHA256;
     let symmetricState = new SymmetricState(hsPattern);
 
     // We get all the Symmetric State field
@@ -352,8 +354,8 @@ describe("js-noise", () => {
     expect(uint8ArrayEquals(cs1.getKey(), cs2.getKey())).to.be.false;
   });
 
-  it("Noise XX Handhshake and message encryption (extended test)", function () {
-    const hsPattern = NoiseHandshakePatterns.XX;
+  it("Noise XX Handshake and message encryption (extended test)", function () {
+    const hsPattern = NoiseHandshakePatterns.Noise_XX_25519_ChaChaPoly_SHA256;
 
     // We initialize Alice's and Bob's Handshake State
     const aliceStaticKey = generateX25519KeyPair();
@@ -464,7 +466,7 @@ describe("js-noise", () => {
   });
 
   it("Noise XXpsk0 Handhshake and message encryption (short test)", function () {
-    const hsPattern = NoiseHandshakePatterns.XXpsk0;
+    const hsPattern = NoiseHandshakePatterns.Noise_XXpsk0_25519_ChaChaPoly_SHA256;
 
     // We generate a random psk
     const psk = randomBytes(32, rng);
@@ -559,7 +561,7 @@ describe("js-noise", () => {
   });
 
   it("Noise K1K1 Handhshake and message encryption (short test)", function () {
-    const hsPattern = NoiseHandshakePatterns.K1K1;
+    const hsPattern = NoiseHandshakePatterns.Noise_K1K1_25519_ChaChaPoly_SHA256;
 
     // We initialize Alice's and Bob's Handshake State
     const aliceStaticKey = generateX25519KeyPair();
@@ -661,7 +663,7 @@ describe("js-noise", () => {
   });
 
   it("Noise XK1 Handhshake and message encryption (short test)", function () {
-    const hsPattern = NoiseHandshakePatterns.XK1;
+    const hsPattern = NoiseHandshakePatterns.Noise_XK1_25519_ChaChaPoly_SHA256;
 
     // We initialize Alice's and Bob's Handshake State
     const aliceStaticKey = generateX25519KeyPair();

src/pairing.ts

@@ -124,7 +124,7 @@ export class WakuPairing {
     const preMessagePKs = [NoisePublicKey.fromPublicKey(this.qr.ephemeralKey)];
 
     this.handshake = new Handshake({
-      hsPattern: NoiseHandshakePatterns.WakuPairing,
+      hsPattern: NoiseHandshakePatterns.Noise_WakuPairing_25519_ChaChaPoly_SHA256,
       ephemeralKey: myEphemeralKey,
       staticKey: myStaticKey,
       prologue: this.qr.toByteArray(),

src/patterns.ts

@@ -1,3 +1,4 @@
+import { TAG_LENGTH as ChaChaPolyTagLen } from "@stablelib/chacha20poly1305";
 import { Hash } from "@stablelib/hash";
 import { SHA256 } from "@stablelib/sha256";
 
@@ -74,6 +75,7 @@ export class HandshakePattern {
   constructor(
     public readonly name: string,
     public readonly hash: new () => Hash,
+    public readonly tagLen: number,
     public readonly preMessagePatterns: Array<PreMessagePattern>,
     public readonly messagePatterns: Array<MessagePattern>
   ) {}
@@ -101,10 +103,11 @@ export class HandshakePattern {
 /**
  * Supported Noise handshake patterns as defined in https://rfc.vac.dev/spec/35/#specification
  */
-export const NoiseHandshakePatterns = {
-  K1K1: new HandshakePattern(
+export const NoiseHandshakePatterns: Record<string, HandshakePattern> = {
+  Noise_K1K1_25519_ChaChaPoly_SHA256: new HandshakePattern(
     "Noise_K1K1_25519_ChaChaPoly_SHA256",
     SHA256,
+    ChaChaPolyTagLen,
     [
       new PreMessagePattern(MessageDirection.r, [NoiseTokens.s]),
       new PreMessagePattern(MessageDirection.l, [NoiseTokens.s]),
@@ -115,9 +118,10 @@ export const NoiseHandshakePatterns = {
       new MessagePattern(MessageDirection.r, [NoiseTokens.se]),
     ]
   ),
-  XK1: new HandshakePattern(
+  Noise_XK1_25519_ChaChaPoly_SHA256: new HandshakePattern(
     "Noise_XK1_25519_ChaChaPoly_SHA256",
     SHA256,
+    ChaChaPolyTagLen,
     [new PreMessagePattern(MessageDirection.l, [NoiseTokens.s])],
     [
       new MessagePattern(MessageDirection.r, [NoiseTokens.e]),
@@ -125,9 +129,10 @@ export const NoiseHandshakePatterns = {
       new MessagePattern(MessageDirection.r, [NoiseTokens.s, NoiseTokens.se]),
     ]
   ),
-  XX: new HandshakePattern(
+  Noise_XX_25519_ChaChaPoly_SHA256: new HandshakePattern(
     "Noise_XX_25519_ChaChaPoly_SHA256",
     SHA256,
+    ChaChaPolyTagLen,
     [],
     [
       new MessagePattern(MessageDirection.r, [NoiseTokens.e]),
@@ -135,9 +140,10 @@ export const NoiseHandshakePatterns = {
       new MessagePattern(MessageDirection.r, [NoiseTokens.s, NoiseTokens.se]),
     ]
   ),
-  XXpsk0: new HandshakePattern(
+  Noise_XXpsk0_25519_ChaChaPoly_SHA256: new HandshakePattern(
     "Noise_XXpsk0_25519_ChaChaPoly_SHA256",
     SHA256,
+    ChaChaPolyTagLen,
     [],
     [
       new MessagePattern(MessageDirection.r, [NoiseTokens.psk, NoiseTokens.e]),
@@ -145,9 +151,10 @@ export const NoiseHandshakePatterns = {
       new MessagePattern(MessageDirection.r, [NoiseTokens.s, NoiseTokens.se]),
     ]
   ),
-  WakuPairing: new HandshakePattern(
+  Noise_WakuPairing_25519_ChaChaPoly_SHA256: new HandshakePattern(
     "Noise_WakuPairing_25519_ChaChaPoly_SHA256",
     SHA256,
+    ChaChaPolyTagLen,
     [new PreMessagePattern(MessageDirection.l, [NoiseTokens.e])],
     [
       new MessagePattern(MessageDirection.r, [NoiseTokens.e, NoiseTokens.ee]),

src/payload.ts

@@ -2,9 +2,9 @@ import { concat as uint8ArrayConcat } from "uint8arrays/concat";
 import { equals as uint8ArrayEquals } from "uint8arrays/equals";
 
 import { MessageNametag } from "./@types/handshake.js";
-import { ChachaPolyTagLen, Curve25519KeySize } from "./crypto.js";
+import { Curve25519KeySize } from "./crypto.js";
 import { MessageNametagLength } from "./messagenametag.js";
-import { PayloadV2ProtocolIDs } from "./patterns.js";
+import { NoiseHandshakePatterns, PayloadV2ProtocolIDs } from "./patterns.js";
 import { NoisePublicKey } from "./publickey.js";
 import { readUIntLE, writeUIntLE } from "./utils.js";
 
@@ -15,22 +15,13 @@ import { readUIntLE, writeUIntLE } from "./utils.js";
  * and the transport message
  */
 export class PayloadV2 {
-  messageNametag: MessageNametag;
-  protocolId: number;
-  handshakeMessage: Array<NoisePublicKey>;
-  transportMessage: Uint8Array;
-
   constructor(
-    messageNametag: MessageNametag = new Uint8Array(MessageNametagLength),
-    protocolId = 0,
-    handshakeMessage: Array<NoisePublicKey> = [],
-    transportMessage: Uint8Array = new Uint8Array()
-  ) {
-    this.messageNametag = messageNametag;
-    this.protocolId = protocolId;
-    this.handshakeMessage = handshakeMessage;
-    this.transportMessage = transportMessage;
-  }
+    public messageNametag: MessageNametag = new Uint8Array(MessageNametagLength),
+    public protocolId = 0,
+    public tagLen = 0,
+    public handshakeMessage: Array<NoisePublicKey> = [],
+    public transportMessage: Uint8Array = new Uint8Array()
+  ) {}
 
   /**
    * Create a copy of the PayloadV2
@@ -41,6 +32,7 @@ export class PayloadV2 {
     r.protocolId = this.protocolId;
     r.transportMessage = new Uint8Array(this.transportMessage);
     r.messageNametag = new Uint8Array(this.messageNametag);
+    r.tagLen = this.tagLen;
     for (let i = 0; i < this.handshakeMessage.length; i++) {
       r.handshakeMessage.push(this.handshakeMessage[i].clone());
     }
@@ -146,6 +138,9 @@ export class PayloadV2 {
       throw new Error("protocolId not found");
     }
 
+    const pattern = NoiseHandshakePatterns[protocolName];
+    const tagLen = pattern ? pattern.tagLen : 0;
+
     i++;
 
     // We read the Handshake Message length (1 byte)
@@ -174,7 +169,7 @@ export class PayloadV2 {
         written += pkLen;
         // If the key is encrypted, we only read the encrypted X coordinate and the authorization tag, and we deserialize into a Noise Public Key
       } else if (flag === 1) {
-        const pkLen = 1 + Curve25519KeySize + ChachaPolyTagLen;
+        const pkLen = 1 + Curve25519KeySize + tagLen;
         handshakeMessage.push(NoisePublicKey.deserialize(payload.subarray(i, i + pkLen)));
         i += pkLen;
         written += pkLen;
@@ -191,6 +186,6 @@ export class PayloadV2 {
     const transportMessage = payload.subarray(i, i + transportMessageLen);
     i += transportMessageLen;
 
-    return new PayloadV2(messageNametag, protocolId, handshakeMessage, transportMessage);
+    return new PayloadV2(messageNametag, protocolId, tagLen, handshakeMessage, transportMessage);
   }
 }

src/waku-noise-pairing.spec.ts

@@ -27,7 +27,7 @@ describe("Waku Noise Sessions", () => {
     // Pairing Phase
     // ==========
 
-    const hsPattern = NoiseHandshakePatterns.WakuPairing;
+    const hsPattern = NoiseHandshakePatterns.Noise_WakuPairing_25519_ChaChaPoly_SHA256;
 
     // Alice static/ephemeral key initialization and commitment
     const aliceStaticKey = generateX25519KeyPair();