From 9724d8ab11352c2591a23914807b6f89a7b721ea Mon Sep 17 00:00:00 2001
From: Alex Mizrahi <alex.mizrahi@gmail.com>
Date: Thu, 30 Nov 2017 19:21:27 +0200
Subject: [PATCH] fixed & improved integer code

---
 lib/asn1/decoders/der.js |  3 ++-
 lib/asn1/encoders/der.js | 11 ++++++-----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/lib/asn1/decoders/der.js b/lib/asn1/decoders/der.js
index c8ccecf..c9943dd 100644
--- a/lib/asn1/decoders/der.js
+++ b/lib/asn1/decoders/der.js
@@ -254,7 +254,8 @@ DERNode.prototype._decodeInt = function decodeInt(buffer, values) {
   const raw = buffer.raw();
   let res = new bignum(raw);
 
-  if ((raw[0] & 0x80) > 0) { // negative
+  // check if number is negative
+  if ((raw[0] & 0x80) > 0) {
     res = res.fromTwos(raw.length * 8);
   }
 
diff --git a/lib/asn1/encoders/der.js b/lib/asn1/encoders/der.js
index 12df10f..da859b5 100644
--- a/lib/asn1/encoders/der.js
+++ b/lib/asn1/encoders/der.js
@@ -5,6 +5,7 @@ const Buffer = require('buffer').Buffer;
 
 const asn1 = require('../../asn1');
 const base = asn1.base;
+const bignum = asn1.bignum;
 
 // Import DER constants
 const der = asn1.constants.der;
@@ -203,16 +204,16 @@ DERNode.prototype._encodeInt = function encodeInt(num, values) {
       let width = Math.ceil(bitLength / 8) * 8;
       // check if sign bit is occupied
       if ((bitLength % 8) === 0) {
-	// when number is of form  10..0 no correction is needed
-	if (num.zeroBits() + 1 !== num.bitLength()) {
-	  width += 8;
-	}
+        // when number is of form  10..0 no correction is needed
+        if (num.zeroBits() + 1 !== num.bitLength()) {
+          width += 8;
+        }
       }
       numArray = num.toTwos(width).toArray();
     } else {
       numArray = num.toArray();
       if (numArray[0] & 0x80) {
-	numArray.unshift(0);
+        numArray.unshift(0);
       }
     }