Replace Math.random by window.crypto.

Author: brocaar

ui/src/components/AESKeyField.js

@@ -165,12 +165,11 @@ class AESKeyField extends Component {
   }
 
   randomKey = () => {
-    let key = "";
-    const possible = 'abcdef0123456789';
+    let cryptoObj = window.crypto || window.msCrypto;
+    let b = new Uint8Array(16);
+    cryptoObj.getRandomValues(b);
 
-    for(let i = 0; i < 32; i++){
-      key += possible.charAt(Math.floor(Math.random() * possible.length));
-    }
+    let key = Buffer.from(b).toString('hex');
     this.setState({
       value: key,
     });

ui/src/components/EUI64Field.js

@@ -76,12 +76,11 @@ class EUI64Field extends Component {
   }
 
   randomKey = () => {
-    let key = "";
-    const possible = 'abcdef0123456789';
+    let cryptoObj = window.crypto || window.msCrypto;
+    let b = new Uint8Array(8);
+    cryptoObj.getRandomValues(b);
 
-    for(let i = 0; i < 16; i++){
-      key += possible.charAt(Math.floor(Math.random() * possible.length));
-    }
+    let key = Buffer.from(b).toString('hex');
     this.setState({
       value: key,
     });

ui/src/views/multicast-groups/MulticastGroupForm.js

@@ -46,22 +46,19 @@ class MulticastGroupForm extends FormComponent {
   }
 
   getRandomKey(len) {
-    let key = "";
-    const possible = 'abcdef0123456789';
+    let cryptoObj = window.crypto || window.msCrypto;
+    let b = new Uint8Array(len);
+    cryptoObj.getRandomValues(b);
 
-    for(let i = 0; i < len; i++){
-      key += possible.charAt(Math.floor(Math.random() * possible.length));
-    }
-
-    return key;
+    return Buffer.from(b).toString('hex');
   }
 
   getRandomMcAddr = (cb) => {
-    cb(this.getRandomKey(8));
+    cb(this.getRandomKey(4));
   }
 
   getRandomSessionKey = (cb) => {
-    cb(this.getRandomKey(32));
+    cb(this.getRandomKey(16));
   }