grub: password_pbkdf2

 
 16.3.56 password_pbkdf2
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  -- Command: password_pbkdf2 user hashed-password
      Define a user named USER with password hash HASHED-PASSWORD.  Use
      'grub-mkpasswd-pbkdf2' (⇒Invoking grub-mkpasswd-pbkdf2) to
      generate password hashes.  ⇒Security.