From 36d9786b3d0f5a7846fabe20f1564e25c5097986 Mon Sep 17 00:00:00 2001
From: Coffee Converter <coffee.becomes.code@gmail.com>
Date: Tue, 24 Mar 2020 15:39:16 -0500
Subject: [PATCH] fixes bug in randBits()

 - the bug was causing the whole first byte to be zeroed out when (bitLength % 8 === 0)
 - added a check of the above condition before zeroing out the extra bits
---
 src/main.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main.js b/src/main.js
index 27a5c71..795a953 100644
--- a/src/main.js
+++ b/src/main.js
@@ -401,8 +401,10 @@ export function randBits(bitLength, forceLength = false) {
 
     const byteLength = Math.ceil(bitLength / 8);
     let rndBytes = randBytesSync(byteLength, false);
-    // Fill with 0's the extra bits
-    rndBytes[0] = rndBytes[0] & (2 ** (bitLength % 8) - 1);
+    if (bitLength % 8) {
+        // Fill with 0's the extra bits
+        rndBytes[0] = rndBytes[0] & (2 ** (bitLength % 8) - 1);
+    }
     if (forceLength) {
         let mask = (bitLength % 8) ? 2 ** ((bitLength % 8) - 1) : 128;
         rndBytes[0] = rndBytes[0] | mask;