void Aes256::encrypt(unsigned char* buffer)
{
unsigned char i, rcon;
copy_key();
add_round_key(buffer, 0);
for (i = 1, rcon = 1; i < NUM_ROUNDS; ++i)
{
sub_bytes(buffer);
shift_rows(buffer);
mix_columns(buffer);
if (!(i & 1))
expand_enc_key(&rcon);
add_round_key(buffer, i);
}
sub_bytes(buffer);
shift_rows(buffer);
expand_enc_key(&rcon);
add_round_key(buffer, i);
}
void Aes256Encoder::Encrypt(MemoryData& rkey, const MemoryData& key,const MemoryData& salt, unsigned char* buffer)
{
unsigned char i, rcon;
copy_key(rkey, key, salt);
add_round_key(rkey.MutableData(), buffer, 0);
for (i = 1, rcon = 1; i < RoundCount; ++i)
{
sub_bytes(buffer);
shift_rows(buffer);
mix_columns(buffer);
if (!(i & 1))
expand_enc_key(rkey.MutableData(), &rcon);
add_round_key(rkey.MutableData(), buffer, i);
}
sub_bytes(buffer);
shift_rows(buffer);
expand_enc_key(rkey.MutableData(), &rcon);
add_round_key(rkey.MutableData(), buffer, i);
}
void Aes256::decrypt(unsigned char* buffer)
{
unsigned char i, rcon = 1;
copy_key();
for (i = NUM_ROUNDS / 2; i > 0; --i)
expand_enc_key(&rcon);
add_round_key(buffer, NUM_ROUNDS);
shift_rows_inv(buffer);
sub_bytes_inv(buffer);
for (i = NUM_ROUNDS, rcon = 0x80; --i;)
{
if ((i & 1))
expand_dec_key(&rcon);
add_round_key(buffer, i);
mix_columns_inv(buffer);
shift_rows_inv(buffer);
sub_bytes_inv(buffer);
}
add_round_key(buffer, i);
}