add crypto shuffle

static/js/modules/interface/proofs.js

@@ -1,13 +1,30 @@
+// Fisher-Yates shuffle
 function cryptoShuffle(l) {
-    for (let i = 0; i < l.length - 1; i++) {}
+    for (let i = l.length - 1; i > 0; i--) {
+        let value = new Uint8Array([0]);
+        crypto.getRandomValues(value);
+        while (value[0] > i) {
+            crypto.getRandomValues(value);
+        }
+
+        let temp = l[i];
+        l[i] = l[value[0]];
+        l[value[0]] = temp;
+    }
+
+    return l;
 }
 
 window.cryptoShuffle = cryptoShuffle;
 
 function proveRegions(regions) {
     // Construct prover coins
+    let coins = [];
+
     let regionNames = Object.keys(regions.keys());
-    let psi = [regionNames];
+    for (let x = 0; x < 20; x++) {
+        let psi = cryptoShuffle(regionNames).join("");
+    }
 
     // Construct verifier coins
     let hasher = new jsSHA("SHA3-256", "TEXT");