cryptographically secure RNG

changeme/src/libs/Random.js

@@ -1,11 +1,20 @@
+import 'react-native-get-random-values';
+
 export function generateKey() {
   let result = [];
   const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
   let charactersLength = characters.length;
 
+  let uintArray = new Uint8Array(64);
+  let newKey = crypto.getRandomValues(uintArray);
+  
   for (let i = 0; i < 64; i++) {
+    let newCharIndex = newKey[i];
+    while(newCharIndex > charactersLength){
+      newCharIndex -= charactersLength;
+    }
     result.push(
-      characters.charAt(Math.floor(Math.random() * charactersLength)),
+      characters.charAt(newCharIndex),
     );
   }