SSH2Stream: use randomFillSync when available

mscdex · Jun 30, 2019 · 391fc6f · 391fc6f
1 parent dc59902
commit 391fc6f
Showing 1 changed file with 12 additions and 2 deletions.
diff --git a/lib/ssh.js b/lib/ssh.js
@@ -5118,8 +5118,7 @@ function send_(self, payload, cb) {
   buf[4] = padLen;
   payload.copy(buf, 5);
 
-  var padBytes = crypto.randomBytes(padLen);
-  padBytes.copy(buf, 5 + payload.length);
+  copyRandPadBytes(buf, 5 + payload.length, padLen);
 
   if (hmac.type !== false && hmac.key) {
     mac = crypto.createHmac(SSH_TO_OPENSSL[hmac.type], hmac.key);
@@ -5200,6 +5199,17 @@ function send_(self, payload, cb) {
   return ret;
 }
 
+var copyRandPadBytes = (function() {
+  if (typeof crypto.randomFillSync === 'function') {
+    return crypto.randomFillSync;
+  } else {
+    return function copyRandPadBytes(buf, offset, count) {
+      var padBytes = crypto.randomBytes(count);
+      padBytes.copy(buf, offset);
+    };
+  }
+})();
+
 function randBytes(n, cb) {
   crypto.randomBytes(n, function retry(err, buf) {
     if (err)