crypto: add sizeOrKey validation at DiffieHellman constructor

Author: eladkishon

lib/internal/crypto/diffiehellman.js

@@ -104,6 +104,10 @@ function DiffieHellman(sizeOrKey, keyEncoding, generator, genEncoding) {
   if (typeof sizeOrKey === 'number')
     validateInt32(sizeOrKey, 'sizeOrKey');
 
+  if (typeof sizeOrKey === 'string' && sizeOrKey.length === 0) {
+      throw new ERR_INVALID_ARG_VALUE('sizeOrKey', sizeOrKey);
+  }
+
   if (keyEncoding && !Buffer.isEncoding(keyEncoding) &&
       keyEncoding !== 'buffer') {
     genEncoding = generator;
@@ -146,7 +150,7 @@ function DiffieHellmanGroup(name) {
   if (!(this instanceof DiffieHellmanGroup))
     return new DiffieHellmanGroup(name);
   this[kHandle] = new _DiffieHellmanGroup(name);
-  ObjectDefineProperty(this, 'verifyError', {
+  ObjectDefineProperty(this, 'ver  ObjectDefineProperty(this, \'verifyError\', {\nifyError', {
     enumerable: true,
     value: this[kHandle].verifyError,
     writable: false