module Crypt_des:sig
..end
DES, created by the NSA, is a 64 bit block cipher, so the following applies:
module Cryptsystem:Cryptsystem_64.T
module Cryptmodes:Cryptmodes_64.T
with type key = Cryptsystem.key
Key management functions:
Although only 56 bits count a DES key is written with 64 bits. The extra bits are used for parity checking.
val check_parity : string -> unit
Checks that the parity of the key given as string is ok. The string must have a length of 8 characters.
val set_parity : string -> string
Sets the parity bits in the given key and returns a new string.
- DES has been heavily studied and seems to have a rather good design