From 2a67ebb4bf0ae2c4468561ac7f7e5bac23b57065 Mon Sep 17 00:00:00 2001
From: Sergey Scheglov <oxdeadbeef.ssch@gmail.com>
Date: Wed, 8 Jun 2022 01:13:30 +0700
Subject: [PATCH 1/2] Added test for .toString(2..36)

---
 test/utils-test.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/utils-test.js b/test/utils-test.js
index 6ff1f93..e65f987 100644
--- a/test/utils-test.js
+++ b/test/utils-test.js
@@ -15,6 +15,14 @@ describe('BN.js/Utils', function () {
         }
       });
     });
+    describe('negative empty value', function () {
+      it('should have the same output as the input', function () {
+        var a = new BN('-');
+        for(var i = 2; i <= 36; i++) {
+          assert.equal(a.toString(i), '-');
+        }
+      });
+    });
     describe('binary padding', function () {
       it('should have a length of 256', function () {
         var a = new BN(0);

From 5adf9e02fbddc51b67b42b482050b98355e59439 Mon Sep 17 00:00:00 2001
From: Sergey Scheglov <oxdeadbeef.ssch@gmail.com>
Date: Wed, 8 Jun 2022 01:16:05 +0700
Subject: [PATCH 2/2] Fix endless cycle .toString(2..15&17..32)

---
 lib/bn.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/bn.js b/lib/bn.js
index adecc94..77b6e57 100644
--- a/lib/bn.js
+++ b/lib/bn.js
@@ -511,7 +511,7 @@
       out = '';
       var c = this.clone();
       c.negative = 0;
-      while (!c.isZero()) {
+      while (!c.isZero() && c.length !== 0) {
         var r = c.modrn(groupBase).toString(base);
         c = c.idivn(groupBase);