refactor: replace big-number usage with jsbi

src/ntlm-payload.ts

@@ -1,9 +1,6 @@
 import WritableTrackingBuffer from './tracking-buffer/writable-tracking-buffer';
 import * as crypto from 'crypto';
-
-const BigInteger = require('big-number');
-
-const hex = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'];
+import JSBI from 'jsbi';
 
 type Options = {
   domain: string,
@@ -111,24 +108,15 @@ class NTLMResponsePayload {
   }
 
   createTimestamp(time: number) {
-    const tenthsOfAMicrosecond = BigInteger(time).plus(11644473600).multiply(10000000);
-    const hexArray = [];
-
-    let pair = [];
-    while (tenthsOfAMicrosecond.val() !== '0') {
-      const idx = tenthsOfAMicrosecond.mod(16);
-      pair.unshift(hex[idx]);
-      if (pair.length === 2) {
-        hexArray.push(pair.join(''));
-        pair = [];
-      }
-    }
+    const tenthsOfAMicrosecond = JSBI.multiply(JSBI.add(JSBI.BigInt(time), JSBI.BigInt(11644473600)), JSBI.BigInt(10000000));
 
-    if (pair.length > 0) {
-      hexArray.push(pair[0] + '0');
-    }
+    const lo = JSBI.toNumber(JSBI.bitwiseAnd(tenthsOfAMicrosecond, JSBI.BigInt(0xffffffff)));
+    const hi = JSBI.toNumber(JSBI.bitwiseAnd(JSBI.signedRightShift(tenthsOfAMicrosecond, JSBI.BigInt(32)), JSBI.BigInt(0xffffffff)));
 
-    return Buffer.from(hexArray.join(''), 'hex');
+    const result = Buffer.alloc(8);
+    result.writeUInt32LE(lo, 0);
+    result.writeUInt32LE(hi, 4);
+    return result;
   }
 
   lmv2Response(domain: string, user: string, password: string, serverNonce: Buffer, clientNonce: Buffer) {