What is Drupal's default password encryption method?

Question

I am trying to figure out what is the security that Drupal 6/7 uses by default to store passwords. Is it MD5, AES, SHA? I have been unable to find anything.

Answer 1

drupal 8 is using Phpass (modified version)

drupal 7 use SHA-512 + salt

drupal 6 and previous version were using md5 with no salt