vobfile.cpp

DVD CSS 加密标准解码程序. 支持解开vob文件.

#include "StdAfx.h"
#include <io.h>
#include "VobFile.h"
#include "CSSauth.h"
#include "CSSscramble.h"
#include "udf.h"

//
// CDVDSession
//

CDVDSession::CDVDSession()
	: m_session(DVD_END_ALL_SESSIONS)
	, m_hDrive(INVALID_HANDLE_VALUE)
{
}

CDVDSession::~CDVDSession()
{
	EndSession();
}

bool CDVDSession::Open(LPCTSTR path)
{
	Close();

	CString fn = path;
	CString drive = _T("\\\\.\\") + fn.Left(fn.Find(':')+1);

	m_hDrive = CreateFile(drive, GENERIC_READ, FILE_SHARE_READ, NULL, 
		OPEN_EXISTING, FILE_ATTRIBUTE_READONLY|FILE_FLAG_SEQUENTIAL_SCAN, (HANDLE)NULL);
	if(m_hDrive == INVALID_HANDLE_VALUE)
		return(false);

	return(true);
}

void CDVDSession::Close()
{
	if(m_hDrive != INVALID_HANDLE_VALUE)
	{
		CloseHandle(m_hDrive);
		m_hDrive = INVALID_HANDLE_VALUE;
	}
}

bool CDVDSession::BeginSession()
{
	EndSession();

	if(m_hDrive == INVALID_HANDLE_VALUE)
		return(false);

	DWORD BytesReturned;
	if(!DeviceIoControl(m_hDrive, IOCTL_DVD_START_SESSION, NULL, 0, &m_session, sizeof(m_session), &BytesReturned, NULL))
	{
		m_session = DVD_END_ALL_SESSIONS;
		if(!DeviceIoControl(m_hDrive, IOCTL_DVD_END_SESSION, &m_session, sizeof(m_session), NULL, 0, &BytesReturned, NULL)
		|| !DeviceIoControl(m_hDrive, IOCTL_DVD_START_SESSION, NULL, 0, &m_session, sizeof(m_session), &BytesReturned, NULL))
		{
			CloseHandle(m_hDrive);
			DWORD err = GetLastError();
			return(false);
		}
	}

	return(true);
}

void CDVDSession::EndSession()
{
	if(m_session != DVD_END_ALL_SESSIONS)
	{
		DWORD BytesReturned;
		DeviceIoControl(m_hDrive, IOCTL_DVD_END_SESSION, &m_session, sizeof(m_session), NULL, 0, &BytesReturned, NULL);
        m_session = DVD_END_ALL_SESSIONS;
	}
}

bool CDVDSession::Authenticate()
{
	if(m_session == DVD_END_ALL_SESSIONS) 
		return(false);

	BYTE Challenge[10], Key[10];

	for(int i = 0; i < 10; i++) Challenge[i] = i;

	if(!SendKey(DvdChallengeKey, Challenge))
		return(false);

	if(!ReadKey(DvdBusKey1, Key))
		return(false);

	int varient = -1;

	for(int i = 31; i >= 0; i--)
	{
		BYTE KeyCheck[5];
		CSSkey1(i, Challenge, KeyCheck);
		if(!memcmp(KeyCheck, Key, 5))
			varient = i;
	}

	if(!ReadKey(DvdChallengeKey, Challenge))
		return(false);

	CSSkey2(varient, Challenge, &Key[5]);

	if(!SendKey(DvdBusKey2, &Key[5]))
		return(false);

	CSSbuskey(varient, Key, m_SessionKey);

	return(true);
}

bool CDVDSession::GetDiscKey()
{
	if(m_session == DVD_END_ALL_SESSIONS) 
		return(false);

	BYTE DiscKeys[2048];
	if(!ReadKey(DvdDiskKey, DiscKeys))
		return(false);

	for(int i = 0; i < g_nPlayerKeys; i++)
	{
		for(int j = 1; j < 409; j++)
		{
			BYTE DiscKey[6];
			memcpy(DiscKey, &DiscKeys[j*5], 5);
			DiscKey[5] = 0;

			CSSdisckey(DiscKey, g_PlayerKeys[i]);

			BYTE Hash[6];
			memcpy(Hash, &DiscKeys[0], 5);
			Hash[5] = 0;

			CSSdisckey(Hash, DiscKey);

			if(!memcmp(Hash, DiscKey, 6))
			{
				memcpy(m_DiscKey, DiscKey, 6);
				return(true);
			}
		}
	}

	return(false);
}

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);
}

static void Reverse(BYTE* d, BYTE* s, int len)
{
	if(d == s)
	{
		for(s += len-1; d < s; d++, s--)
			*d ^= *s, *s ^= *d, *d ^= *s;
	}
	else
	{
		for(int i = 0; i < len; i++)
			d[i] = s[len-1 - i];
	}
}

bool CDVDSession::SendKey(DVD_KEY_TYPE KeyType, BYTE* pKeyData)
{
	CAutoPtr<DVD_COPY_PROTECT_KEY> key;

	switch(KeyType)
	{
		case DvdChallengeKey: 
			key.Attach((DVD_COPY_PROTECT_KEY*)new BYTE[DVD_CHALLENGE_KEY_LENGTH]);
			key->KeyLength = DVD_CHALLENGE_KEY_LENGTH;
			Reverse(key->KeyData, pKeyData, 10);
			break;
		case DvdBusKey2:
			key.Attach((DVD_COPY_PROTECT_KEY*)new BYTE[DVD_BUS_KEY_LENGTH]);
			key->KeyLength = DVD_BUS_KEY_LENGTH;
			Reverse(key->KeyData, pKeyData, 5);
			break;
		default: 
			break;
	}

	if(!key)
		return(false);

	key->SessionId = m_session;
	key->KeyType = KeyType;
	key->KeyFlags = 0;

	DWORD BytesReturned;
	return(!!DeviceIoControl(m_hDrive, IOCTL_DVD_SEND_KEY, key, key->KeyLength, NULL, 0, &BytesReturned, NULL));
}

bool CDVDSession::ReadKey(DVD_KEY_TYPE KeyType, BYTE* pKeyData, int lba)
{
	CAutoPtr<DVD_COPY_PROTECT_KEY> key;

	switch(KeyType)
	{
		case DvdChallengeKey: 
			key.Attach((DVD_COPY_PROTECT_KEY*)new BYTE[DVD_CHALLENGE_KEY_LENGTH]);
			key->KeyLength = DVD_CHALLENGE_KEY_LENGTH;
			key->Parameters.TitleOffset.QuadPart = 0;
			break;
		case DvdBusKey1:
			key.Attach((DVD_COPY_PROTECT_KEY*)new BYTE[DVD_BUS_KEY_LENGTH]);
			key->KeyLength = DVD_BUS_KEY_LENGTH;
			key->Parameters.TitleOffset.QuadPart = 0;
			break;
		case DvdDiskKey:
			key.Attach((DVD_COPY_PROTECT_KEY*)new BYTE[DVD_DISK_KEY_LENGTH]);
			key->KeyLength = DVD_DISK_KEY_LENGTH;
			key->Parameters.TitleOffset.QuadPart = 0;
			break;
		case DvdTitleKey:
			key.Attach((DVD_COPY_PROTECT_KEY*)new BYTE[DVD_TITLE_KEY_LENGTH]);
			key->KeyLength = DVD_TITLE_KEY_LENGTH;
			key->Parameters.TitleOffset.QuadPart = 2048i64*lba;
			break;
		default: 
			break;
	}

	if(!key)
		return(false);

	key->SessionId = m_session;
	key->KeyType = KeyType;
	key->KeyFlags = 0;

	DWORD BytesReturned;
	if(!DeviceIoControl(m_hDrive, IOCTL_DVD_READ_KEY, key, key->KeyLength, key, key->KeyLength, &BytesReturned, NULL))
	{
		DWORD err = GetLastError();
		return(false);
	}

	switch(KeyType)
	{
		case DvdChallengeKey:
			Reverse(pKeyData, key->KeyData, 10);
			break;
		case DvdBusKey1:
			Reverse(pKeyData, key->KeyData, 5);
			break;
		case DvdDiskKey:
			memcpy(pKeyData, key->KeyData, 2048);
			for(int i = 0; i < 2048/5; i++)
				pKeyData[i] ^= m_SessionKey[4-(i%5)];
			break;
		case DvdTitleKey:
			memcpy(pKeyData, key->KeyData, 5);
			for(int i = 0; i < 5; i++)
				pKeyData[i] ^= m_SessionKey[4-(i%5)];
			break;
		default: 
			break;
	}

	return(true);
}

//
// CLBAFile
//

CLBAFile::CLBAFile()
{
}

CLBAFile::~CLBAFile()
{
}

bool CLBAFile::IsOpen()
{
	return(m_hFile != hFileNull);
}

bool CLBAFile::Open(LPCTSTR path)
{
	Close();

	return(!!CFile::Open(path, modeRead|typeBinary|shareDenyWrite|osSequentialScan));
}

void CLBAFile::Close()
{
	if(m_hFile != hFileNull) 
		CFile::Close();
}

int CLBAFile::GetLength()
{
	return (int)(CFile::GetLength()/2048);
}

int CLBAFile::GetPosition()
{
	return (int)(CFile::GetPosition()/2048);
}

int CLBAFile::Seek(int lba)
{
	return (int)(CFile::Seek(2048i64*lba, CFile::begin)/2048);
}

bool CLBAFile::Read(BYTE* buff)
{
	return CFile::Read(buff, 2048) == 2048;
}

//
// CVobFile
//

CVobFile::CVobFile()
{
	Close();
}

CVobFile::~CVobFile()
{
}

bool CVobFile::IsDVD()
{
	return m_fDVD;
}

bool CVobFile::HasDiscKey(BYTE* key)
{
	if(key) memcpy(key, m_DiscKey, 5);
	return m_fHasDiscKey;
}

bool CVobFile::HasTitleKey(BYTE* key)
{
	if(key) memcpy(key, m_TitleKey, 5);
	return m_fHasTitleKey;
}

bool CVobFile::Open(CString fn, CStringList& vobs)
{
	CFile f;
	if(!f.Open(fn, CFile::modeRead|CFile::typeBinary|CFile::shareDenyWrite))
		return(false);

	char hdr[13];
	f.Read(hdr, 12);
	hdr[12] = 0;
	if(strcmp(hdr, "DVDVIDEO-VTS"))
		return(false);

	f.Close();

	int offset = -1;

	vobs.RemoveAll();

	fn = fn.Left(fn.ReverseFind('.')+1);
	fn.TrimRight(_T(".0123456789"));
	for(int i = 0; i < 100; i++)
	{
		CString vob;
		vob.Format(_T("%s%d.vob"), fn, i);

		CFileStatus status;
		if(!CFile::GetStatus(vob, status))
		{
			if(i == 0) continue;
			else break;
		}

		if(status.m_size&0x7ff)
		{
			vobs.RemoveAll();
			break;
		}

		if(status.m_size > 0)
			vobs.AddTail(vob);

		if(i == 0)
			offset = (int)(status.m_size/0x800);
	}

	return Open(vobs, offset);
}

bool CVobFile::Open(CStringList& vobs, int offset)
{
	Close();

	if(vobs.GetCount() == 0)
		return(false);

	if(vobs.GetCount() == 1)
		offset = -1;

	m_offset = offset;

	POSITION pos = vobs.GetHeadPosition();
	while(pos)
	{
		CString fn = vobs.GetNext(pos);

		WIN32_FIND_DATA fd;
		HANDLE h = FindFirstFile(fn, &fd);
		if(h == INVALID_HANDLE_VALUE)
		{
			m_files.RemoveAll();
			return(false);
		}
		FindClose(h);

		file_t f;
		f.fn = fn;
		f.size = (int)((__int64(fd.nFileSizeHigh<<32)|fd.nFileSizeLow)/2048);
		m_files.Add(f);

		m_size += f.size;
	}

	if(m_files.GetCount() > 0 && CDVDSession::Open(m_files[0].fn))
	{
		for(int i = 0; !m_fHasTitleKey && i < m_files.GetCount(); i++)
		{
			if(BeginSession())
			{
				m_fDVD = true;
				Authenticate();
				m_fHasDiscKey = GetDiscKey();
				EndSession();
			}
			else
			{
				CString fn = m_files[0].fn;
				fn.MakeLower();

				if(fn.Find(_T(":\\video_ts")) == 1 && GetDriveType(fn.Left(3)) == DRIVE_CDROM)
				{
					m_fDVD = true;
				}

				break;
			}

			if(tp_udf_file f = udf_find_file(m_hDrive, 0, CStringA(m_files[i].fn.Mid(m_files[i].fn.Find(':')+1))))
			{
				DWORD start, end;
				if(udf_get_lba(m_hDrive, f, &start, &end))
				{
					if(BeginSession())
					{
						Authenticate();
						m_fHasTitleKey = GetTitleKey(start + f->partition_lba, m_TitleKey);
						EndSession();
					}
				}

				udf_free(f);
			}

			BYTE key[5];
			if(HasTitleKey(key) && i == 0 && offset >= 0)
			{
				i++;

				if(BeginSession())
				{
					m_fDVD = true;
					Authenticate();
					m_fHasDiscKey = GetDiscKey();
					EndSession();
				}
				else
				{
					break;
				}

				if(tp_udf_file f = udf_find_file(m_hDrive, 0, CStringA(m_files[i].fn.Mid(m_files[i].fn.Find(':')+1))))
				{
					DWORD start, end;
					if(udf_get_lba(m_hDrive, f, &start, &end))
					{
						if(BeginSession())
						{
							Authenticate();
							m_fHasTitleKey = GetTitleKey(start + f->partition_lba, m_TitleKey);
							EndSession();
						}
					}

					udf_free(f);
				}

				if(!m_fHasTitleKey)
				{
					memcpy(m_TitleKey, key, 5);
					m_fHasTitleKey = true;
				}
			}
		}
	}
/*
	if(m_files.GetCount() > 0 && !m_fDVD)
	{
		CString fn = m_files[0].fn;
		fn.MakeLower();

		if(fn.Find(_T(":\\video_ts")) == 1 && GetDriveType(fn.Left(3)) == DRIVE_CDROM)
		{
			m_fDVD = true;
		}
	}
*/
	m_offset = max(offset, 0);

	return(true);
}

void CVobFile::Close()
{
	CDVDSession::Close();
	m_files.RemoveAll();
	m_iFile = -1;
	m_pos = m_size = m_offset = 0;
	m_file.Close();
	m_fDVD = m_fHasDiscKey = m_fHasTitleKey = false;
}

int CVobFile::GetLength()
{
	return(m_size - m_offset);
}

int CVobFile::GetPosition()
{
	return(m_pos - m_offset);
}

int CVobFile::Seek(int pos)
{
	pos = min(max(pos+m_offset, m_offset), m_size-1);

	int i = -1;
	int size = 0;

	// this suxx, but won't take long
	do size += m_files[++i].size;
	while(i < m_files.GetSize() && pos >= size);

	if(i != m_iFile && i < m_files.GetSize())
	{
		if(!m_file.Open(m_files[i].fn))
			return(m_pos);

		m_iFile = i;
	}

	m_pos = pos;

	pos -= (size - m_files[i].size);
	m_file.Seek(pos);

	return(GetPosition());
}

bool CVobFile::Read(BYTE* buff)
{
	if(m_pos >= m_size) return(false);

	if(m_file.IsOpen() && m_file.GetPosition() == m_file.GetLength())
	{
		m_file.Close();
	}

	if(!m_file.IsOpen())
	{
		if(m_iFile >= m_files.GetSize()-1)
		{
			return(false);
		}

		if(!m_file.Open(m_files[++m_iFile].fn))
		{
			m_iFile = -1; 
			return(false);
		}
	}

	if(!m_file.Read(buff))
	{
		// dvd still locked?
		return(false);
	}

	m_pos++;

	if(buff[0x14] & 0x30)
	{
		if(m_fHasTitleKey)
		{
			CSSdescramble(buff, m_TitleKey);
			buff[0x14] &= ~0x30;
		}
		else
		{
			// under win9x this is normal, but I'm not developing under win9x :P
			ASSERT(0);
		}
	}

	return(true);
}