From ec9cac17d0c27c31085c21fc03a9edc3af88e8f6 Mon Sep 17 00:00:00 2001
From: Christophe Diederichs <chris.d.itunes@gmail.com>
Date: Wed, 17 Jun 2020 13:19:05 +0200
Subject: [PATCH] added: sodium_is_zero

---
 crypto_verify.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/crypto_verify.js b/crypto_verify.js
index 29ab54c..bfa5099 100644
--- a/crypto_verify.js
+++ b/crypto_verify.js
@@ -3,7 +3,8 @@ const assert = require('nanoassert')
 module.exports = {
   crypto_verify_16,
   crypto_verify_32,
-  sodium_memcmp
+  sodium_memcmp,
+  sodium_is_zero
 }
 
 function vn (x, xi, y, yi, n) {
@@ -25,3 +26,9 @@ function sodium_memcmp (a, b) {
 
   return vn(a, 0, b, 0, a.byteLength) === 0
 }
+
+function sodium_is_zero = function (arr) {
+  var d = 0
+  for (let i = 0; i < arr.length; i++) d |= arr[i]
+  return d === 0
+}