grub-mkpasswd-pbkdf2 — Generate a PBKDF2 password hash.
grub-mkpasswd-pbkdf2 [-c | --iteration-count=NUM] [-l | --buflen=NUM]
[-s | --salt=NUM]
grub-mkpasswd-pbkdf2 generates a PBKDF2 password string suitable for use in a GRUB configuration file.
--iteration-count=NUM
Number of PBKDF2 iterations.
--buflen=NUM
Length of generated hash.
--salt=NUM
Length of salt to use.
info grub