grub-mkpasswd-pbkdf2 - generate hashed password for GRUB
grub-mkpasswd-pbkdf2 [OPTIONS]
-c number, --iteration-count=number
Number of PBKDF2 iterations
-l number, --buflen=number
Length of generated hash
-s number, --salt=number
Length of salt
Report bugs to <bug-grub@gnu.org>.