int hill_crypt(const int hash_size, int* const key, int* const message, int* result) {
    int i,j;
    int temp;

    for (i = 0; i < hash_size; i++) {
        temp = 0;
        for (j = 0; j < hash_size; j++) {
            temp += key[i*hash_size + j] * message[j];
        }
        result[i] = temp%65535;
    }
    return 0;
};
/* int hill_decrypt(const int key_dim, int* const key, int* message) { */

/*  return 0; */
/* }; */