// Helper function for multithreaded key transformation
PwDatabase::ErrorCode PwDatabase::performKeyTransformRounds(const unsigned char* pTransformSeed,
unsigned char* pTransKey, const quint64 nRounds, bool reportProgress) {
// make a local copy of the subkey and the key
unsigned char transKey[SUBKEY_SIZE];
unsigned char key[32];
memcpy(transKey, pTransKey, SUBKEY_SIZE);
memcpy(key, pTransformSeed, 32);
// prepare key transform
Rijndael aes;
int ec = (qint8)aes.init(Rijndael::ECB, Rijndael::Encrypt, key, Rijndael::Key32Bytes, 0);
if (ec != RIJNDAEL_SUCCESS) {
LOG("Rijndael init error %d", ec);
return KEY_TRANSFORM_INIT_ERROR;
}
if (reportProgress) {
for (quint64 round = 0; round < nRounds; round++) {
setProgress(round);
aes.encrypt(transKey, transKey); // only works with 16-byte buffers
}
} else {
for (quint64 round = 0; round < nRounds; round++) {
aes.encrypt(transKey, transKey); // only works with 16-byte buffers
}
}
memcpy(pTransKey, transKey, SUBKEY_SIZE);
return SUCCESS;
}
