Initial version

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2025-06-15 18:40:30 -06:00
parent 78eb6e64df
commit 2f08b94c89
7 changed files with 1682 additions and 0 deletions

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13
package.json Normal file
View File

@ -0,0 +1,13 @@
{
"name": "signal_encrypted_poc",
"version": "1.0.0",
"type": "module",
"dependencies": {
"@signalapp/libsignal-client": "^0.45.0",
"express": "^4.18.2",
"uuid": "^9.0.0"
},
"scripts": {
"start": "node server.js"
}
}

257
public/index.html Normal file
View File

@ -0,0 +1,257 @@
<!doctype html>
<html>
<head>
<title>Encrypted Todo List</title>
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<div class="header">
<h1>Encrypted Todo List</h1>
</div>
<div id="user-setup" class="container">
<h3 class="section-title">Create/Login User</h3>
<input type="text" id="userId" placeholder="Enter user ID" />
<button onclick="createUser()">Create User</button>
</div>
<div id="todo-app" style="display: none">
<div class="container">
<h3 class="section-title">Add New Todo</h3>
<div>
<input
type="text"
id="todoText"
placeholder="Enter todo item"
/>
<button onclick="addTodo()">Add Todo</button>
</div>
</div>
<div class="container">
<h3 class="section-title">Your Encrypted Todos</h3>
<div class="toggle-container">
<span>Show Decrypted</span>
<label class="toggle-switch">
<input
type="checkbox"
id="viewToggle"
onchange="toggleView()"
/>
<span class="slider"></span>
</label>
<span>Show Encrypted</span>
</div>
<div id="todos"></div>
</div>
</div>
<script>
let currentUser = null;
let allTodos = [];
let showEncrypted = false;
let allUsers = [];
async function createUser() {
const userId = document.getElementById("userId").value;
if (!userId) return;
try {
const response = await fetch("/api/users", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ userId }),
});
if (response.ok) {
currentUser = userId;
document.getElementById("user-setup").style.display =
"none";
document.getElementById("todo-app").style.display =
"block";
loadUsers();
loadTodos();
} else {
const error = await response.json();
alert(error.error);
}
} catch (error) {
alert("Error creating user: " + error.message);
}
}
async function loadUsers() {
try {
const response = await fetch("/api/users");
allUsers = await response.json();
} catch (error) {
console.error("Error loading users:", error);
}
}
async function addTodo() {
const text = document.getElementById("todoText").value;
if (!text) return;
try {
const response = await fetch(
`/api/users/${currentUser}/todos`,
{
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ text }),
},
);
if (response.ok) {
document.getElementById("todoText").value = "";
loadTodos();
}
} catch (error) {
alert("Error adding todo: " + error.message);
}
}
async function loadTodos() {
try {
// Get the decrypted todos
const response = await fetch(
`/api/users/${currentUser}/todos`,
);
const todos = await response.json();
// Get the raw encrypted todos
const encryptedResponse = await fetch(
`/api/users/${currentUser}/todos/encrypted`,
);
const encryptedTodos = await encryptedResponse.json();
// Create a map of encrypted todos by ID
const encryptedMap = {};
encryptedTodos.forEach((todo) => {
encryptedMap[todo.id] = todo.encrypted;
});
// Combine the data
allTodos = todos.map((todo) => ({
...todo,
encrypted: encryptedMap[todo.id] || {
body: "Encryption data not available",
},
}));
renderTodos();
} catch (error) {
console.error("Error loading todos:", error);
}
}
function renderTodos() {
const todosDiv = document.getElementById("todos");
if (allTodos.length === 0) {
todosDiv.innerHTML = "<p>No todos yet. Add one above.</p>";
return;
}
todosDiv.innerHTML = allTodos
.map(
(todo) => `
<div class="todo-item">
<div class="todo-content">
${
showEncrypted
? `<div class="encrypted-data">
<strong>Type:</strong> ${todo.encrypted.type}<br>
<strong>Encrypted Data:</strong><br>${todo.encrypted.body}
</div>`
: `<div>
<span>${todo.text}</span>
${todo.sharedBy ? `<span class="shared-badge">Shared by ${todo.sharedBy}</span>` : ""}
</div>`
}
</div>
<div class="todo-actions">
${
!todo.sharedBy
? `
<div class="share-container">
<select id="share-${todo.id}" class="share-select">
<option value="">Share with...</option>
${allUsers
.filter((user) => user !== currentUser)
.map(
(user) =>
`<option value="${user}">${user}</option>`,
)
.join("")}
</select>
<button onclick="shareTodo('${todo.id}')">Share</button>
</div>
`
: ""
}
<button onclick="deleteTodo('${todo.id}')">Delete</button>
</div>
</div>
`,
)
.join("");
}
function toggleView() {
showEncrypted = document.getElementById("viewToggle").checked;
renderTodos();
}
async function shareTodo(todoId) {
const selectElement = document.getElementById(
`share-${todoId}`,
);
const recipientId = selectElement.value;
if (!recipientId) {
alert("Please select a user to share with");
return;
}
try {
const response = await fetch(
`/api/users/${currentUser}/todos/${todoId}/share`,
{
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ recipientId }),
},
);
if (response.ok) {
alert(`Todo shared with ${recipientId}`);
selectElement.value = "";
} else {
const error = await response.json();
alert(error.error);
}
} catch (error) {
alert("Error sharing todo: " + error.message);
}
}
async function deleteTodo(todoId) {
try {
const response = await fetch(
`/api/users/${currentUser}/todos/${todoId}`,
{ method: "DELETE" },
);
if (response.ok) {
loadTodos();
}
} catch (error) {
alert("Error deleting todo: " + error.message);
}
}
</script>
</body>
</html>

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body {
font-family: Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
.todo-item {
background: #f5f5f5;
margin: 10px 0;
padding: 15px;
border-radius: 5px;
display: flex;
justify-content: space-between;
align-items: flex-start;
}
.todo-content {
flex-grow: 1;
}
.todo-actions {
display: flex;
flex-direction: column;
align-items: flex-end;
}
button {
padding: 8px 12px;
margin: 5px;
background-color: #4a6ea9;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
}
button:hover {
background-color: #3a5a89;
}
input,
select {
padding: 10px;
margin: 5px;
width: 300px;
border: 1px solid #ccc;
border-radius: 4px;
}
.toggle-container {
display: flex;
align-items: center;
margin: 15px 0;
}
.toggle-switch {
position: relative;
display: inline-block;
width: 60px;
height: 34px;
margin: 0 10px;
}
.toggle-switch input {
opacity: 0;
width: 0;
height: 0;
}
.slider {
position: absolute;
cursor: pointer;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: #ccc;
transition: 0.4s;
border-radius: 34px;
}
.slider:before {
position: absolute;
content: "";
height: 26px;
width: 26px;
left: 4px;
bottom: 4px;
background-color: white;
transition: 0.4s;
border-radius: 50%;
}
input:checked + .slider {
background-color: #4a6ea9;
}
input:checked + .slider:before {
transform: translateX(26px);
}
.encrypted-data {
font-family: monospace;
word-break: break-all;
color: #666;
font-size: 0.9em;
background-color: #f0f0f0;
padding: 5px;
border-radius: 3px;
max-height: 100px;
overflow-y: auto;
}
.header {
display: flex;
align-items: center;
margin-bottom: 20px;
}
.header h1 {
margin-right: 10px;
margin-bottom: 0;
}
.share-container {
margin-top: 10px;
display: flex;
align-items: center;
}
.shared-badge {
background-color: #4a6ea9;
color: white;
padding: 3px 8px;
border-radius: 10px;
font-size: 0.8em;
margin-left: 10px;
}
.container {
background-color: white;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
padding: 20px;
margin-bottom: 20px;
}
.section-title {
border-bottom: 1px solid #eee;
padding-bottom: 10px;
margin-top: 0;
}

122
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import express from "express";
import { EncryptedTodoService } from "./todo-service.js";
const app = express();
const todoService = new EncryptedTodoService();
app.use(express.json());
app.use(express.static("public"));
// Create user
app.post("/api/users", async (req, res) => {
try {
const { userId } = req.body;
if (!userId) {
return res.status(400).json({ error: "userId is required" });
}
const user = await todoService.createUser(userId);
res.json(user);
} catch (error) {
res.status(400).json({ error: error.message });
}
});
// Get all users (for sharing)
app.get("/api/users", async (req, res) => {
try {
const users = Array.from(todoService.users.keys());
res.json(users);
} catch (error) {
res.status(400).json({ error: error.message });
}
});
// Add todo
app.post("/api/users/:userId/todos", async (req, res) => {
try {
const { userId } = req.params;
const { text } = req.body;
if (!text) {
return res.status(400).json({ error: "Todo text is required" });
}
const todoId = await todoService.addTodo(userId, text);
res.json({ todoId });
} catch (error) {
res.status(400).json({ error: error.message });
}
});
// Get todos (decrypted)
app.get("/api/users/:userId/todos", async (req, res) => {
try {
const { userId } = req.params;
const todos = await todoService.getTodos(userId);
res.json(todos);
} catch (error) {
res.status(400).json({ error: error.message });
}
});
// Get encrypted todos
app.get("/api/users/:userId/todos/encrypted", async (req, res) => {
try {
const { userId } = req.params;
// Get the user's todo IDs
const todoIds = todoService.userTodos.get(userId) || new Set();
// Get the encrypted todos
const encryptedTodos = Array.from(todoIds)
.map((todoId) => {
const todo = todoService.todos.get(todoId);
if (!todo) return null;
return {
id: todoId,
encrypted: todo.encrypted,
createdAt: todo.createdAt,
};
})
.filter((todo) => todo !== null);
res.json(encryptedTodos);
} catch (error) {
res.status(400).json({ error: error.message });
}
});
// Delete todo
app.delete("/api/users/:userId/todos/:todoId", async (req, res) => {
try {
const { userId, todoId } = req.params;
await todoService.deleteTodo(userId, todoId);
res.json({ success: true });
} catch (error) {
res.status(400).json({ error: error.message });
}
});
// Share todo with another user
app.post("/api/users/:userId/todos/:todoId/share", async (req, res) => {
try {
const { userId, todoId } = req.params;
const { recipientId } = req.body;
if (!recipientId) {
return res.status(400).json({ error: "Recipient ID is required" });
}
await todoService.shareTodo(userId, todoId, recipientId);
res.json({ success: true });
} catch (error) {
res.status(400).json({ error: error.message });
}
});
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
console.log(`Encrypted Todo server running on port ${PORT}`);
});

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import libsignal from "@signalapp/libsignal-client";
import crypto from "crypto";
// Simple key derivation function for demo purposes
function deriveKeys(userId) {
const salt = Buffer.from("signal-protocol-demo-salt");
const info = Buffer.from("signal-protocol-demo-info");
const keyMaterial = crypto.createHash("sha256").update(userId).digest();
// Derive encryption key
const encKey = crypto
.createHmac("sha256", keyMaterial)
.update(Buffer.concat([salt, Buffer.from("enc")]))
.digest();
// Derive authentication key
const authKey = crypto
.createHmac("sha256", keyMaterial)
.update(Buffer.concat([salt, Buffer.from("auth")]))
.digest();
return { encKey, authKey };
}
export class SignalClient {
constructor(userId) {
this.userId = userId;
this.deviceId = 1;
// Derive keys from userId (in a real app, these would be securely exchanged)
const { encKey, authKey } = deriveKeys(userId);
this.encKey = encKey;
this.authKey = authKey;
}
static async create(userId) {
const client = new SignalClient(userId);
console.log(`SignalClient initialized for user: ${userId}`);
return client;
}
// Encrypt using AES-GCM with authentication
async encrypt(message) {
try {
// Generate a random IV
const iv = crypto.randomBytes(12);
// Create cipher
const cipher = crypto.createCipheriv("aes-256-gcm", this.encKey, iv);
// Encrypt the message
let encrypted = cipher.update(message, "utf8", "hex");
encrypted += cipher.final("hex");
// Get the auth tag
const authTag = cipher.getAuthTag();
// Create a Signal-like message format
return {
type: 1, // Signal message type
body: Buffer.from(
JSON.stringify({
iv: iv.toString("hex"),
data: encrypted,
tag: authTag.toString("hex"),
// Add a note to indicate this is using Signal Protocol concepts
note: "Encrypted with AES-GCM using Signal Protocol concepts",
}),
).toString("base64"),
};
} catch (error) {
console.error("Error encrypting:", error);
throw error;
}
}
// Decrypt the message
async decrypt(encryptedMessage) {
try {
const payload = JSON.parse(
Buffer.from(encryptedMessage.body, "base64").toString(),
);
const iv = Buffer.from(payload.iv, "hex");
const encrypted = payload.data;
const authTag = Buffer.from(payload.tag, "hex");
// Create decipher
const decipher = crypto.createDecipheriv("aes-256-gcm", this.encKey, iv);
decipher.setAuthTag(authTag);
// Decrypt
let decrypted = decipher.update(encrypted, "hex", "utf8");
decrypted += decipher.final("utf8");
return decrypted;
} catch (error) {
console.error("Error decrypting:", error);
throw error;
}
}
}

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import { SignalClient } from "./signal-crypto.js";
import { v4 as uuidv4 } from "uuid";
export class EncryptedTodoService {
constructor() {
this.users = new Map(); // userId -> SignalClient
this.todos = new Map(); // todoId -> encrypted todo
this.userTodos = new Map(); // userId -> Set of todoIds
this.sharedSessions = new Map(); // userId+recipientId -> shared session
}
async createUser(userId) {
if (this.users.has(userId)) {
console.log(`User ${userId} already exists. Logging in.`);
return { userId };
}
const client = await SignalClient.create(userId);
this.users.set(userId, client);
this.userTodos.set(userId, new Set());
return { userId };
}
getUser(userId) {
const user = this.users.get(userId);
if (!user) {
throw new Error("User not found. Please create the user first.");
}
return user;
}
async addTodo(userId, todoText) {
const client = this.getUser(userId);
const todoId = uuidv4();
// Self-encrypt the todo
const encryptedTodo = await client.encrypt(todoText);
this.todos.set(todoId, {
id: todoId,
userId,
encrypted: encryptedTodo,
createdAt: new Date().toISOString(),
originalText: todoText, // Store original for sharing (in a real app, this would be encrypted)
});
this.userTodos.get(userId).add(todoId);
console.log(`Todo added for user ${userId}: ${todoId}`);
return todoId;
}
async getTodos(userId) {
const client = this.getUser(userId);
const todoIds = this.userTodos.get(userId) || new Set();
const todos = [];
for (const todoId of todoIds) {
const encryptedTodo = this.todos.get(todoId);
if (encryptedTodo) {
try {
const decryptedText = await client.decrypt(encryptedTodo.encrypted);
todos.push({
id: todoId,
text: decryptedText,
createdAt: encryptedTodo.createdAt,
sharedBy: encryptedTodo.sharedBy,
sharedWith: encryptedTodo.sharedWith || [],
});
} catch (error) {
console.error(`Failed to decrypt todo ${todoId}:`, error);
}
}
}
return todos.sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt));
}
async deleteTodo(userId, todoId) {
const userTodos = this.userTodos.get(userId);
if (!userTodos || !userTodos.has(todoId)) {
throw new Error("Todo not found");
}
userTodos.delete(todoId);
// Don't delete from todos map if it's shared with others
const todo = this.todos.get(todoId);
if (todo && (!todo.sharedWith || todo.sharedWith.length === 0)) {
this.todos.delete(todoId);
}
console.log(`Todo deleted: ${todoId}`);
return true;
}
// Share a todo with another user
async shareTodo(userId, todoId, recipientId) {
// Validate users and todo
const senderClient = this.getUser(userId);
const recipientClient = this.getUser(recipientId);
const todo = this.todos.get(todoId);
if (!todo) {
throw new Error("Todo not found");
}
// Get the original text (in a real app, this would be re-encrypted for the recipient)
const originalText = todo.originalText;
if (!originalText) {
throw new Error("Cannot share this todo");
}
// Encrypt the todo for the recipient
const encryptedForRecipient = await recipientClient.encrypt(originalText);
// Create a new todo ID for the shared copy
const sharedTodoId = uuidv4();
// Store the shared todo
this.todos.set(sharedTodoId, {
id: sharedTodoId,
userId: recipientId,
encrypted: encryptedForRecipient,
createdAt: new Date().toISOString(),
originalText: originalText,
sharedBy: userId,
});
// Add to recipient's todos
this.userTodos.get(recipientId).add(sharedTodoId);
// Track sharing in the original todo
if (!todo.sharedWith) {
todo.sharedWith = [];
}
todo.sharedWith.push(recipientId);
console.log(
`Todo ${todoId} shared from ${userId} to ${recipientId} as ${sharedTodoId}`,
);
return sharedTodoId;
}
}