Assignment 12
Create a simple program that encrypts and decrypts using GnuTLS an arbitrary file with
AES-128 in CBC mode (using OpenSSL library).
  
  Use 128b AES-CBC  with 
  fixed key: 00112233445566778899aabbccddeeff (in hexa) and
  fixed IV:  00000000000000000000000000000001 (in hexa).

  cross-check with your openssl implementation
  use gnutls_cipher_* [5 pt]

Use GnuTLS and genereate RSA keypair generation [5pt]
− no restriction on the public exponent
− use gnutls_privkey_generate
− print all key data to the screen


Hints:
 - file names (input, output) and command (encrypt, decrypt) should be taken
   from command line arguments
 - Do NOT use padding, ciphertext file MUST be the same size as plaintext,
   input file size must be aligned to cipher blocks.

Deadline: December 25, 2018 (8:00 AM), maximum is 10 points.

The source code must be compilable on the provided virtual machine (Linux Fedora)
or on aisa server.