crypto: move _randomBytes call out of handleError funct

This commit moves the _randomBytes function call out of the handleError
function, which now it takes in an error and a buf object as its
parameters.

PR-URL: #28318
Reviewed-By: Yongsheng Zhang <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: James M Snell <[email protected]>

lib/internal/crypto/random.js

@@ -51,7 +51,7 @@ function randomBytes(size, cb) {
 
  const buf = Buffer.alloc(size);
 
- if (!cb) return handleError(buf, 0, size);
+ if (!cb) return handleError(_randomBytes(buf, 0, size), buf);
 
  const wrap = new AsyncWrap(Providers.RANDOMBYTESREQUEST);
  wrap.ondone = (ex) => { // Retains buf while request is in flight.
@@ -77,7 +77,7 @@ function randomFillSync(buf, offset = 0, size) {
  size = assertSize(size, elementSize, offset, buf.byteLength);
  }
 
- return handleError(buf, offset, size);
+ return handleError(_randomBytes(buf, offset, size), buf);
 }
 
 function randomFill(buf, offset, size, cb) {
@@ -115,8 +115,7 @@ function randomFill(buf, offset, size, cb) {
  _randomBytes(buf, offset, size, wrap);
 }
 
-function handleError(buf, offset, size) {
- const ex = _randomBytes(buf, offset, size);
+function handleError(ex, buf) {
  if (ex) throw ex;
  return buf;
 }