crypto: fix DiffieHellman generator validation

PR-URL: #38311
Fixes: #38302
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

lib/internal/crypto/diffiehellman.js

@@ -122,9 +122,9 @@ function DiffieHellman(sizeOrKey, keyEncoding, generator, genEncoding) {
     generator = DH_GENERATOR;
   } else if (typeof generator === 'number') {
     validateInt32(generator, 'generator');
-  } else if (generator !== true) {
+  } else if (typeof generator === 'string') {
     generator = toBuf(generator, genEncoding);
-  } else {
+  } else if (!isArrayBufferView(generator) && !isAnyArrayBuffer(generator)) {
     throw new ERR_INVALID_ARG_TYPE(
       'generator',
       ['number', 'string', 'ArrayBuffer', 'Buffer', 'TypedArray', 'DataView'],

test/parallel/test-crypto-dh.js

@@ -495,3 +495,7 @@ assert.throws(
     code: 'ERR_INVALID_ARG_TYPE'
   }
 );
+[true, Symbol(), {}, () => {}, []].forEach((generator) => assert.throws(
+  () => crypto.createDiffieHellman('', 'base64', generator),
+  { code: 'ERR_INVALID_ARG_TYPE' }
+));