changed password generator to use a better randomness source

Makefile

@@ -1,5 +1,7 @@
 JSPKGMAN = "yarn"
 ROOTDIR = $(dir $(CURDIR))
+HEAD=$(shell git rev-parse --short HEAD)
+
 
 dev:
 	$(JSPKGMAN) run vite dev 
@@ -16,7 +18,9 @@ wasm-pack:
 
 docker:
 	podman build -t docker.io/jmbitci/crypttool .
+	podman build -t docker.io/jmbitci/crypttool:$(HEAD) .
 	podman push docker.io/jmbitci/crypttool
+	podman push docker.io/jmbitci/crypttool:$(HEAD)
 
 
 #TODO get rid of -f and check whether files exist instead

README.md

@@ -4,3 +4,11 @@ This Project is more of a proof of concept than an actually useful Application,
 The Idea of this Project is to do all of the Encryption client-side using Javascript or WebAssembly, so the Website will work without any Server and can be packaged as a single html file and distributed this way.
 
 Ideally, I would like for this to be able to en/decrypt any content. A nice to have Feature would be to make it work in a "self-extracting" way, so you could basically generate a html file that prompts you for a password and decrypts its content.
+
+## Technology
+This website is essentially a frontend to the Browsers [SubtleCrypto](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) cryptography API. 
+
+## TODO
+- Make sure the cryptography is sound
+- Configuration options (Password length, type)
+- Passhphrase option

src/lib/generalStore.ts

@@ -6,3 +6,4 @@ export let encryptTarget = writable();
 export let decryptSource = writable();
 export let decryptDestination = writable<File>();
 export let errorMessage = writable<string>("");
+export let passwordLength = writable<number>(16);

src/lib/pwgen.ts

@@ -1,14 +1,23 @@
 import { writable} from 'svelte/store';
+import { passwordLength } from './generalStore';
+let length: number = 16;
+passwordLength.subscribe(value => {
+  length = value;
+})
 
 function generateRandomString(length: number): string {
   let result = '';
-  for (let i = 0; i < length; i++) {
+  while (result.length < length) {
-    const charCode = Math.floor(Math.random() * 62);
+    const array = new Uint8Array(1);
+    self.crypto.getRandomValues(array);
+    const charCode: number = array[0];
+    if ( 33 < charCode && charCode < 126 ) {
       result += String.fromCharCode(charCode + (charCode < 26 ? 65 : (charCode < 52 ? 71 : -4)));
     }
+  }
   return result;
 }
 
-const password: string = generateRandomString(16);
+const password: string = generateRandomString(length);
 export let globalPassword = writable(password);