This is the EuCrypt library that Eulora server (S.MG) uses for its communication needs. 

To compile the whole EuCrypt library, simply run in the eucrypt folder (the -O3 switch is needed for specifying optimisation level for Serpent - if you don't care about that, you can skip this switch):
gprbuild -O3

To cleanup (recursively), simply run in the eucrypt folder:
gprclean -r

To understand EuCrypt, start from http://www.dianacoman.com/2017/12/07/introducing-eucrypt/

Components:
1. mpi
  Arbitrary length integers and operations.
  Implemented in C.

2. smg_bit_keccak
  Bit-level implementation of the Keccak sponge according to The Keccak Reference v 3.0.
  Implemented in Ada.

3. smg_keccak
  Word (64 bits) level implementation of the Keccak sponge according to The Keccak Reference v 3.0. 
  NOTE: Keccak rate has its own type (Keccak_Rate) that makes clear the valid range (1 to width of state). Calling Keccak sponge with a bitrate outside the valid range will CORRECTLY cause the execution to abort with a constraint_error.
  Implemented in Ada.

4. smg_serpent
  Serpent hash method.
  Implemented in Ada.

5. smg_rsa
  RSA implementation using TMSR specification.
  Implemented in C.