crypto: align parameter names with documentation

Change _cb_ to _callback_ to align with documentation. This is so that
stack traces and error messages align with the documentation. If the
documentation says "callback", then the stack traces and error messages
should indicate that "callback" needs to be function or whatever, rather
than "cb".

PR-URL: #35054
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>

lib/internal/crypto/random.js

@@ -49,19 +49,19 @@ function assertSize(size, elementSize, offset, length) {
   return size >>> 0;  // Convert to uint32.
 }
 
-function randomBytes(size, cb) {
+function randomBytes(size, callback) {
   size = assertSize(size, 1, 0, Infinity);
-  if (cb !== undefined && typeof cb !== 'function')
-    throw new ERR_INVALID_CALLBACK(cb);
+  if (callback !== undefined && typeof callback !== 'function')
+    throw new ERR_INVALID_CALLBACK(callback);
 
   const buf = new FastBuffer(size);
 
-  if (!cb) return handleError(_randomBytes(buf, 0, size), buf);
+  if (!callback) return handleError(_randomBytes(buf, 0, size), buf);
 
   const wrap = new AsyncWrap(Providers.RANDOMBYTESREQUEST);
   wrap.ondone = (ex) => {  // Retains buf while request is in flight.
-    if (ex) return cb.call(wrap, ex);
-    cb.call(wrap, null, buf);
+    if (ex) return callback.call(wrap, ex);
+    callback.call(wrap, null, buf);
   };
 
   _randomBytes(buf, 0, size, wrap);
@@ -85,22 +85,22 @@ function randomFillSync(buf, offset = 0, size) {
   return handleError(_randomBytes(buf, offset, size), buf);
 }
 
-function randomFill(buf, offset, size, cb) {
+function randomFill(buf, offset, size, callback) {
   if (!isArrayBufferView(buf)) {
     throw new ERR_INVALID_ARG_TYPE('buf', 'ArrayBufferView', buf);
   }
 
   const elementSize = buf.BYTES_PER_ELEMENT || 1;
 
   if (typeof offset === 'function') {
-    cb = offset;
+    callback = offset;
     offset = 0;
     size = buf.bytesLength;
   } else if (typeof size === 'function') {
-    cb = size;
+    callback = size;
     size = buf.byteLength - offset;
-  } else if (typeof cb !== 'function') {
-    throw new ERR_INVALID_CALLBACK(cb);
+  } else if (typeof callback !== 'function') {
+    throw new ERR_INVALID_CALLBACK(callback);
   }
 
   offset = assertOffset(offset, elementSize, buf.byteLength);
@@ -113,8 +113,8 @@ function randomFill(buf, offset, size, cb) {
 
   const wrap = new AsyncWrap(Providers.RANDOMBYTESREQUEST);
   wrap.ondone = (ex) => {  // Retains buf while request is in flight.
-    if (ex) return cb.call(wrap, ex);
-    cb.call(wrap, null, buf);
+    if (ex) return callback.call(wrap, ex);
+    callback.call(wrap, null, buf);
   };
 
   _randomBytes(buf, offset, size, wrap);
@@ -126,22 +126,22 @@ const RAND_MAX = 0xFFFF_FFFF_FFFF;
 
 // Generates an integer in [min, max) range where min is inclusive and max is
 // exclusive.
-function randomInt(min, max, cb) {
+function randomInt(min, max, callback) {
   // Detect optional min syntax
   // randomInt(max)
-  // randomInt(max, cb)
+  // randomInt(max, callback)
   const minNotSpecified = typeof max === 'undefined' ||
     typeof max === 'function';
 
   if (minNotSpecified) {
-    cb = max;
+    callback = max;
     max = min;
     min = 0;
   }
 
-  const isSync = typeof cb === 'undefined';
-  if (!isSync && typeof cb !== 'function') {
-    throw new ERR_INVALID_CALLBACK(cb);
+  const isSync = typeof callback === 'undefined';
+  if (!isSync && typeof callback !== 'function') {
+    throw new ERR_INVALID_CALLBACK(callback);
   }
   if (!NumberIsSafeInteger(min)) {
     throw new ERR_INVALID_ARG_TYPE('min', 'safe integer', min);
@@ -180,15 +180,15 @@ function randomInt(min, max, cb) {
     // Async API
     const pickAttempt = () => {
       randomBytes(6, (err, bytes) => {
-        if (err) return cb(err);
+        if (err) return callback(err);
         const x = bytes.readUIntBE(0, 6);
         // If x > (maxVal - (maxVal % range)), we will get "modulo bias"
         if (x > randLimit) {
           // Try again
           return pickAttempt();
         }
         const n = (x % range) + min;
-        cb(null, n);
+        callback(null, n);
       });
     };