// Perform the key expansion for AES-128 using 16-byte key; each round stored in round_key
// Pseudocode taken from Fig.11 in FIPS-197 (page 20)
void key_expansion(unsigned char init_key[16], unsigned char round_key[44][4], FILE* table) {
unsigned char* temp = (unsigned char*)calloc(1,4);
unsigned char* s_box = (unsigned char*)calloc(1,256);
unsigned char* rcon = (unsigned char*)calloc(1,256);
init_s_box(s_box, table);
init_rcon(rcon);
// Store initial round keys (form words from each piece of init key)
for(int i=0; i<4; i++) {
round_key[i][0] = init_key[4*i];
round_key[i][1] = init_key[4*i+1];
round_key[i][2] = init_key[4*i+2];
round_key[i][3] = init_key[4*i+3];
// Tried defining round key as a WORD (unsigned int), but I forgot there are
// little-endian/big-endian issues with different architectures. F**k that.
}
// Generate subsequent round keys (from Nk -> Nb*(Nr+1))
for(int i=4; i<44; i++) {
// Set temp var to previous round key
temp[0] = round_key[i-1][0];
temp[1] = round_key[i-1][1];
temp[2] = round_key[i-1][2];
temp[3] = round_key[i-1][3];
// Perform Rijndael key schedule core every 4 iterations
if (i%4 == 0) {
// For AES-128 and AES-192; rotate temp vals, put through s_box, xor the MSB with rcon
rot_word(temp);
temp[0] = s_box[ temp[0] ] ^ rcon[i/4];
temp[1] = s_box[ temp[1] ];
temp[2] = s_box[ temp[2] ];
temp[3] = s_box[ temp[3] ];
}
// Store current round key
round_key[i][0] = round_key[i-4][0] ^ temp[0];
round_key[i][1] = round_key[i-4][1] ^ temp[1];
round_key[i][2] = round_key[i-4][2] ^ temp[2];
round_key[i][3] = round_key[i-4][3] ^ temp[3];
}
free(temp);
free(s_box);
free(rcon);
}
void init()
{
sigset_t sigmask;
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGALRM);
sigaddset(&sigmask, SIGUSR1);
sigprocmask(SIG_BLOCK, &sigmask, NULL);
console_print("Emergence Client " VERSION "\n");
SDL_Init(SDL_INIT_AUDIO);
init_user();
init_network();
init_timer();
init_openssl();
init_key();
init_download();
init_servers();
create_cvars();
init_console_cvars();
init_render_cvars();
init_map_cvars();
create_control_cvars();
// create_input_cvars();
init_tick_cvars();
init_console();
create_colour_cvars();
struct string_t *string = new_string_string(emergence_home_dir);
string_cat_text(string, "/client.config");
if(!exec_config_file(string->text))
{
exec_config_file(find_resource("default-controls.config"));
}
else
{
char *ver = get_cvar_string("version");
if(*ver == '\0')
{
struct string_t *command = new_string_text("rm ");
string_cat_string(command, emergence_home_dir);
string_cat_text(command, "/skins/default.skin*");
console_print("%s\n", command->text);
system(command->text);
vid_mode = -1; // find a nice mode
exec_config_file(find_resource("default-controls.config"));
}
free(ver);
}
free_string(string);
set_cvar_string("version", VERSION);
init_skin();
init_input();
init_control();
init_render();
init_rcon();
init_ping();
create_cvar_command("quit", client_shutdown_char);
init_sound();
init_game();
init_alarm();
render_frame();
string = new_string_text("%s%s", emergence_home_dir->text, "/client.autoexec");
if(!exec_config_file(string->text))
exec_config_file(find_resource("default-client.autoexec"));
free_string(string);
start_server_discovery();
}
