address comments

examples/flush-notes/README.md

@@ -1,36 +1,16 @@
-This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+## Waku dependencies
+- @waku/interfaces
+- @waku/message-encryption
+- @waku/sdk
+- @waku/utils
 
-## Getting Started
+## Description
-
+Exchange encrypted or plain notes by link.
-First, run the development server:
+This example shows how symmetric encryption can be used to encrypt only part of Waku message.
 
+## How to run
 ```bash
-npm run dev
+npm start
 # or
-yarn dev
+yarn start
-# or
-pnpm dev
-# or
-bun dev
 ```
-
-Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
-
-You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
-
-This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
-
-## Learn More
-
-To learn more about Next.js, take a look at the following resources:
-
-- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
-- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
-
-You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
-
-## Deploy on Vercel
-
-The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
-
-Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

examples/flush-notes/package.json

@@ -8,11 +8,10 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "@waku/interfaces": "^0.0.20",
+    "@waku/interfaces": "0.0.21-7eb3375.0",
-    "@waku/message-encryption": "^0.0.23",
+    "@waku/message-encryption": "0.0.24-7eb3375.0",
-    "@waku/sdk": "^0.0.21",
+    "@waku/sdk": "0.0.22-7eb3375.0",
-    "@waku/utils": "^0.0.13",
+    "@waku/utils": "0.0.14-7eb3375.0",
-    "ethereum-cryptography": "^2.1.2",
     "next": "14.0.2",
     "react": "^18",
     "react-dom": "^18",

examples/flush-notes/src/app/globals.css

@@ -21,10 +21,8 @@
   align-items: center;
 }
 
-.password-value {
+.to-encrypt {
   font-size: 1rem;
-  height: 2rem;
-  width: 250px;
   padding: 5px;
 }
 

examples/flush-notes/src/app/layout.tsx

@@ -2,7 +2,7 @@
 
 import React from "react";
 import { Inter } from "next/font/google";
-import { WakuProvider } from "@/app/WakuProvider";
+import { WakuProvider } from "@/components/WakuProvider";
 import "./globals.css";
 
 const inter = Inter({ subsets: ["latin"] });

examples/flush-notes/src/app/page.tsx

@@ -7,7 +7,7 @@ import { notes } from "@/services/notes";
 export default function Create() {
   const router = useRouter();
   const { note, onNoteChange } = useEditNote();
-  const { password, onPasswordChange } = usePassword();
+  const { toEncrypt, onEncryptChange } = useEncryptedState();
 
   const onSave = async () => {
     if (!note) {
@@ -15,10 +15,12 @@ export default function Create() {
     }
 
     try {
-      const id = await notes.createNote(note, password);
+      const { id, password } = await notes.createNote(note, toEncrypt);
-      router.push(`/view/${id}`);
+      const passwordParam = password ? `?password=${password}` : "";
+
+      router.push(`/view/${id}${passwordParam}`);
     } catch (error) {
-      console.log("Failed to create a note:", error);
+      console.error("Failed to create a note:", error);
     }
   };
 
@@ -28,13 +30,17 @@ export default function Create() {
         Your record will be stored for couple of days. Markdown is supported.
       </p>
       <div className="create-header">
-        <input
+        <div>
-          className="password-value"
+          <input
-          type="password"
+            type="checkbox"
-          onChange={onPasswordChange}
+            id="isEncrypted"
-          placeholder="Optional password"
+            name="isEncrypted"
-          autoComplete="off"
+            onChange={onEncryptChange}
-        />
+          />
+          <label htmlFor="isEncrypted" className="to-encrypt">
+            Private (only those that have link will read the note)
+          </label>
+        </div>
         <button onClick={onSave} className="save-note">
           Save note
         </button>
@@ -61,15 +67,15 @@ const useEditNote = () => {
   };
 };
 
-const usePassword = () => {
+const useEncryptedState = () => {
-  const [password, setPassword] = React.useState<string>();
+  const [toEncrypt, setToEncrypt] = React.useState<string>();
 
-  const onPasswordChange = (event: React.FormEvent<HTMLInputElement>) => {
+  const onEncryptChange = (event: React.FormEvent<HTMLSelectElement>) => {
-    setPassword(event?.currentTarget?.value);
+    setToEncrypt(event?.currentTarget?.value);
   };
 
   return {
-    password,
+    toEncrypt,
-    onPasswordChange,
+    onEncryptChange,
   };
 };

examples/flush-notes/src/app/view/page.tsx

@@ -5,7 +5,7 @@ import Markdown from "react-markdown";
 import { useRouter } from "next/navigation";
 import { useNoteURL } from "@/hooks/useNoteURL";
 import { notes } from "@/services/notes";
-import { Loading } from "../Loading";
+import { Loading } from "@/components/Loading";
 
 const View = () => {
   const router = useRouter();

examples/flush-notes/src/components/WakuProvider.tsx

@@ -3,7 +3,7 @@
 import React from "react";
 import { waku, Waku, WakuEvents } from "@/services/waku";
 import { WakuStatus } from "@/const";
-import { Loading } from "./Loading";
+import { Loading } from "@/components/Loading";
 
 type WakuContextProps = {
   status: WakuStatus;

examples/flush-notes/src/hooks/useNoteURL.ts

@@ -1,12 +1,13 @@
 "use client";
-import { usePathname } from "next/navigation";
+import { usePathname, useSearchParams } from "next/navigation";
 
 export const useNoteURL = (): undefined | string => {
   const pathname = usePathname();
-  const urlParams = new URLSearchParams(window.location.search);
+  const params = useSearchParams();
+
   const segments = pathname.split("/");
   const viewIndex = segments.indexOf("view");
-  const password = urlParams.get("password");
+  const password = params.get("password");
 
   return {
     password,

examples/flush-notes/src/services/notes.ts

@@ -2,9 +2,10 @@
 
 import { waku } from "@/services/waku";
 import { CONTENT_TOPIC } from "@/const";
-import { encrypt, decrypt } from "ethereum-cryptography/aes";
+import {
-import { getRandomBytes } from "ethereum-cryptography/random";
+  symmetric,
-import { pbkdf2 } from "ethereum-cryptography/pbkdf2";
+  generateSymmetricKey,
+} from "@waku/message-encryption/crypto";
 import {
   createDecoder,
   createEncoder,
@@ -21,14 +22,12 @@ import { bytesToHex, hexToBytes } from "@waku/utils/bytes";
 type Note = {
   id: string;
   content: string;
-  kdf:
+  iv: string;
-    | undefined
+};
-    | {
+
-        iv: string;
+type NoteResult = {
-        dklen: number;
+  id: string;
-        c: number;
+  password?: string;
-        salt: string;
-      };
 };
 
 export class Notes {
@@ -42,16 +41,23 @@ export class Notes {
     this.encoder = createEncoder({ contentTopic: CONTENT_TOPIC });
   }
 
-  public async createNote(content: string, password?: string): Promise<string> {
+  public async createNote(
-    const note = password
+    content: string,
-      ? await this.encryptNote(content, password)
+    toEncrypt?: boolean
-      : { id: generateRandomString(), content, kdf: undefined };
+  ): Promise<NoteResult> {
+    const symmetricKey = toEncrypt ? generateSymmetricKey() : undefined;
+    const note = toEncrypt
+      ? await this.encryptNote(content, symmetricKey)
+      : { id: generateRandomString(), content, iv: undefined };
 
     await waku.send(this.encoder, {
       payload: utf8ToBytes(JSON.stringify(note)),
     });
 
-    return note.id;
+    return {
+      id: note.id,
+      password: symmetricKey ? bytesToHex(symmetricKey) : undefined,
+    };
   }
 
   public async readNote(
@@ -74,7 +80,7 @@ export class Notes {
         }
       });
 
-    if (!message?.kdf) {
+    if (!message?.iv) {
       return message?.content;
     }
 
@@ -100,48 +106,36 @@ export class Notes {
     });
   }
 
-  private async encryptNote(content: string, password: string): Promise<Note> {
+  private async encryptNote(
-    const iv = await getRandomBytes(16);
+    content: string,
-    const salt = await getRandomBytes(32);
+    symmetricKey: Uint8Array
-    const c = 131072;
+  ): Promise<Note> {
-    const dklen = 16;
+    const iv = symmetric.generateIv();
-    const kdf = await pbkdf2(
+    const encryptedContent = await symmetric.encrypt(
-      utf8ToBytes(password.normalize("NFKC")),
+      iv,
-      salt,
+      symmetricKey,
-      c,
+      utf8ToBytes(content)
-      dklen,
-      "sha256"
     );
-    const encryptedContent = await encrypt(utf8ToBytes(content), kdf, iv);
 
     return {
       id: generateRandomString(),
       content: bytesToHex(encryptedContent),
-      kdf: {
+      iv: bytesToHex(iv),
-        c,
-        dklen,
-        iv: bytesToHex(iv),
-        salt: bytesToHex(salt),
-      },
     };
   }
 
   private async decryptNote(note: Note, password: string): Promise<string> {
-    if (!note?.kdf) {
+    if (!note?.iv) {
-      throw Error("Failed to decrypt a note, no kdf params found.");
+      throw Error("Failed to decrypt a note, no IV params found.");
     }
 
-    const iv = hexToBytes(note.kdf.iv);
+    const iv = hexToBytes(note.iv);
-    const salt = hexToBytes(note.kdf.salt);
+    const symmetricKey = hexToBytes(password);
-
+    const decryptedContent = await symmetric.decrypt(
-    const kdf = await pbkdf2(
+      iv,
-      utf8ToBytes(password.normalize("NFKC")),
+      symmetricKey,
-      salt,
+      hexToBytes(note.content)
-      note.kdf.c,
-      note.kdf.dklen,
-      "sha256"
     );
-    const decryptedContent = await decrypt(hexToBytes(note.content), kdf, iv);
 
     return bytesToUtf8(decryptedContent);
   }