bool CDVDSession::GetTitleKey(int lba, BYTE* pKey)
{
if (m_session == DVD_END_ALL_SESSIONS) {
return false;
}
if (!ReadKey(DvdTitleKey, pKey, lba)) {
return false;
}
if (!(pKey[0] | pKey[1] | pKey[2] | pKey[3] | pKey[4])) {
return false;
}
pKey[5] = 0;
CSStitlekey(pKey, m_DiscKey);
return true;
}
STDMETHODIMP CDeCSSInputPin::Set(REFGUID PropSet, ULONG Id, LPVOID pInstanceData, ULONG InstanceLength, LPVOID pPropertyData, ULONG DataLength)
{
if (PropSet != AM_KSPROPSETID_CopyProt) {
return E_NOTIMPL;
}
switch (Id) {
case AM_PROPERTY_COPY_MACROVISION:
break;
case AM_PROPERTY_DVDCOPY_CHLG_KEY: { // 3. auth: receive drive nonce word, also store and encrypt the buskey made up of the two nonce words
AM_DVDCOPY_CHLGKEY* pChlgKey = (AM_DVDCOPY_CHLGKEY*)pPropertyData;
for (int i = 0; i < 10; i++) {
m_Challenge[i] = pChlgKey->ChlgKey[9 - i];
}
CSSkey2(m_varient, m_Challenge, &m_Key[5]);
CSSbuskey(m_varient, m_Key, m_KeyCheck);
}
break;
case AM_PROPERTY_DVDCOPY_DISC_KEY: { // 5. receive the disckey
AM_DVDCOPY_DISCKEY* pDiscKey = (AM_DVDCOPY_DISCKEY*)pPropertyData; // pDiscKey->DiscKey holds the disckey encrypted with itself and the 408 disckeys encrypted with the playerkeys
bool fSuccess = false;
for (int j = 0; j < g_nPlayerKeys; j++) {
for (int k = 1; k < 409; k++) {
BYTE DiscKey[6];
for (int i = 0; i < 5; i++) {
DiscKey[i] = pDiscKey->DiscKey[k * 5 + i] ^ m_KeyCheck[4 - i];
}
DiscKey[5] = 0;
CSSdisckey(DiscKey, g_PlayerKeys[j]);
BYTE Hash[6];
for (int i = 0; i < 5; i++) {
Hash[i] = pDiscKey->DiscKey[i] ^ m_KeyCheck[4 - i];
}
Hash[5] = 0;
CSSdisckey(Hash, DiscKey);
if (!memcmp(Hash, DiscKey, 6)) {
memcpy(m_DiscKey, DiscKey, 6);
j = g_nPlayerKeys;
fSuccess = true;
break;
}
}
}
if (!fSuccess) {
return E_FAIL;
}
}
break;
case AM_PROPERTY_DVDCOPY_DVD_KEY1: { // 2. auth: receive our drive-encrypted nonce word and decrypt it for verification
AM_DVDCOPY_BUSKEY* pKey1 = (AM_DVDCOPY_BUSKEY*)pPropertyData;
for (int i = 0; i < 5; i++) {
m_Key[i] = pKey1->BusKey[4 - i];
}
m_varient = -1;
for (int i = 31; i >= 0; i--) {
CSSkey1(i, m_Challenge, m_KeyCheck);
if (memcmp(m_KeyCheck, &m_Key[0], 5) == 0) {
m_varient = i;
}
}
}
break;
case AM_PROPERTY_DVDCOPY_REGION:
break;
case AM_PROPERTY_DVDCOPY_SET_COPY_STATE:
break;
case AM_PROPERTY_DVDCOPY_TITLE_KEY: { // 6. receive the title key and decrypt it with the disc key
AM_DVDCOPY_TITLEKEY* pTitleKey = (AM_DVDCOPY_TITLEKEY*)pPropertyData;
for (int i = 0; i < 5; i++) {
m_TitleKey[i] = pTitleKey->TitleKey[i] ^ m_KeyCheck[4 - i];
}
m_TitleKey[5] = 0;
CSStitlekey(m_TitleKey, m_DiscKey);
}
break;
default:
return E_PROP_ID_UNSUPPORTED;
}
return S_OK;
}
