This is a simple implementation of DES algorithm. DES (Data Encryption Standard) is a symetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for modern applications, it has been highly influential in the advancement of cryptography and its a good case study for cryptography students.
The library is composed by only two functions, Encrypt and Decrypt:
DES_STATUS Encrypt (
const uint8_t* buffer,
const uint64_t buffer_size,
const uint8_t key[8],
uint8_t** cipher,
uint64_t* cipher_size
);
// TODO: Decrypt function
int Decrypt(void);To compile and execute both library and tests:
$ make all
To compile the simpledes.so library:
$ make lib
This command will create an .so file with their respective symbolic links.
If you want to compile only the tests, you can execute:
$ make tests
If you already had compiled the source code and want just to execute the generated files, you may want to run:
$ make run_main_tests
TBD