Encrypt task descriptions using AES-GCM**

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mytaskapplication",
-  "version": "1.7.0",
+  "version": "1.7.1",
   "main": "app.js",
   "author": {
     "name": "Maik Roland Damm",

src/app/components/task-add/task-add.component.ts

@@ -6,6 +6,7 @@ import {DarkModeService} from '../../services/dark-mode.service';
 import {NgClass} from '@angular/common';
 import {NgbDatepickerModule, NgbTooltip} from '@ng-bootstrap/ng-bootstrap';
 import {ModalService} from '../../services/modal.service';
+import {AccountService} from '../../services/account.service';
 
 
 @Component({
@@ -25,7 +26,8 @@ export class TaskAddComponent {
   modalService = inject(ModalService)
 
   constructor(private tasksService: TasksService,
-              private darkModeService: DarkModeService) {
+              private darkModeService: DarkModeService,
+              private accountService: AccountService) {
   }
 
   get isDarkMode(): boolean {
@@ -38,7 +40,90 @@ export class TaskAddComponent {
     //return new Date(date.getTime() + date.getTimezoneOffset() * 60000);
   }
 
-  addTask(taskDescription:string) {
+  /**
+   * Encrypts a string with a given secret key
+   * @param text The string to encrypt
+   * @returns Promise with the encrypted string (base64 encoded)
+   */
+  private async encryptTaskDesk(text: string): Promise<string> {
+
+    const secretKey = this.accountService.getSecret() || '';
+
+    if (!text) return '';
+
+    try {
+      // Convert strings to proper format for encryption
+      const textEncoder = new TextEncoder();
+      const encodedText = textEncoder.encode(text);
+
+      // Create a key from the secret
+      const keyMaterial = await this.getKeyMaterial(secretKey);
+      const key = await this.deriveKey(keyMaterial);
+
+      // Generate a random initialization vector
+      const iv = crypto.getRandomValues(new Uint8Array(12));
+
+      // Encrypt the text
+      const encryptedContent = await crypto.subtle.encrypt(
+        {
+          name: 'AES-GCM',
+          iv
+        },
+        key,
+        encodedText
+      );
+
+      // Combine the IV and encrypted content into a single array
+      const encryptedContentArray = new Uint8Array(iv.length + encryptedContent.byteLength);
+      encryptedContentArray.set(iv, 0);
+      encryptedContentArray.set(new Uint8Array(encryptedContent), iv.length);
+
+      // Convert to Base64 string for storage
+      return btoa(String.fromCharCode(...encryptedContentArray));
+    } catch (error) {
+      console.error('Encryption error:', error);
+      return '';
+    }
+  }
+
+  /**
+   * Helper function to generate key material from a password
+   */
+  private async getKeyMaterial(password: string): Promise<CryptoKey> {
+    const textEncoder = new TextEncoder();
+    return await crypto.subtle.importKey(
+      'raw',
+      textEncoder.encode(password),
+      { name: 'PBKDF2' },
+      false,
+      ['deriveBits', 'deriveKey']
+    );
+  }
+
+  /**
+   * Helper function to derive an AES-GCM key from key material
+   */
+  private async deriveKey(keyMaterial: CryptoKey): Promise<CryptoKey> {
+    // Use a salt (can be a fixed value as long as it's consistent)
+    const textEncoder = new TextEncoder(); // Fixed: Define textEncoder here
+    const salt = textEncoder.encode('this-is-a-fixed-salt');
+
+    return await crypto.subtle.deriveKey(
+      {
+        name: 'PBKDF2',
+        salt,
+        iterations: 100000,
+        hash: 'SHA-256'
+      },
+      keyMaterial,
+      { name: 'AES-GCM', length: 256 },
+      false,
+      ['encrypt', 'decrypt']
+    );
+  }
+
+
+  async addTask(taskDescription:string) {
 
     if(taskDescription.length === 0) {
       // console.log("Empty task description");
@@ -54,6 +139,8 @@ export class TaskAddComponent {
     // Convert the datetime string to timestamp (without timezone issues)
     const timestamp = this.dateStringToTimestamp(this.selectedDateTime);
 
+    const encryptedDescription = await this.encryptTaskDesk(taskDescription);
+
     const options = {
       notify: false,
       notified: false,
@@ -62,7 +149,7 @@ export class TaskAddComponent {
 
       let task: Task = {
       id: new_id,
-      description: taskDescription,
+      description: encryptedDescription,
       completed: false,
       dueDate: timestamp,
       options: options,