Does google's Crypto.JS AES encryption use PBKDF2 as default? Does google's Crypto.JS AES encryption use PBKDF2 as default?

Some references, but I can't figure out the answer myself:

https://code.google.com/p/crypto-js/#The_Cipher_Algorithms

https://code.google.com/p/crypto-js/source/browse/tags/3.1.2/src/aes.js
The documentation says it's OpenSSL, not PBKDF2:


  When you use a CipherParams object in a string context, it's automatically converted to a string according to a format strategy. The default is an OpenSSL-compatible format


This can be verified in the source code. The implementation of the OpenSSL KDF is in evpkdf.js.

The key derivation function is usually referenced as EVP_BytesToKey which is the higher level function in the API that implements the KDF.