byte * AES128::decrypt(byte *message) {
int i;
memcpy((void*)state, (const void*)message, 16);
initKey();
/*Generate Round Keys*/
/*
for(i = 0; i < 10; i++) {
computeKey(rcon[i], i+1);
}
*/
inv_addRoundKey(10);
inv_shiftRows();
inv_subBytes();
for(i = 0; i < 9; i++)
{
inv_addRoundKey(9-i);
inv_mixColumns();
inv_shiftRows();
inv_subBytes();
}
inv_addRoundKey(0);
memcpy((void*)message,(const void*)state,16);
return message;
}
//Decrypts one 16-byte array of data
void AES::decryptBlock(int keySize, uint8_t* state, uint8_t* key) {
int rounds=6+keySize/32;
addRoundKey(state,key+rounds*16);
for(int i=rounds-1;i>=0;i--) {
inv_shiftRows(state);
inv_subBytes(state);
addRoundKey(state,key+16*i);
if(i!=0) //don't mix columns on last round
inv_mixColumns(state);
}
}
