This is an implementation in C of DES (Data Encryption Standard).
This is to be used only for files that are multiples of 64 bits exactly. We used ECB as a mode of operation but haven't implemented any padding system (it is not the point, if you want to add it you can always fork the code!).
DES is a broken cypher and this work is intended for educational purpose.
DES.c and DES.h contain the functions used in the DES algorithm.
main.c builds the algorithm and allows you to encrypt/decrypt an input file.
Use make to build desbox.
$ make $ desbox --help
- genkey.c is a key generator that prevents weak keys. Use it if you don't have any key to use.
Use make to build the keygen.
$ make genkey $ ./genkey