From 2700cb2792edc8134b4e459f0221b31b9bd77681 Mon Sep 17 00:00:00 2001
From: jude <judesouthworth@pm.me>
Date: Mon, 10 Apr 2023 22:23:06 +0100
Subject: [PATCH] add crypto shuffle

---
 static/js/modules/interface/proofs.js | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/static/js/modules/interface/proofs.js b/static/js/modules/interface/proofs.js
index 9868111..ada55cd 100644
--- a/static/js/modules/interface/proofs.js
+++ b/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");