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/*
dbx_tree: tree database driver for Miranda IM
Copyright 2007-2010 Michael "Protogenes" Kunz,
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "EncryptionManager.h"
#include <tchar.h>
uint32_t CEncryptionManager::CipherListRefCount = 0;
CEncryptionManager::TCipherList* CEncryptionManager::CipherList = NULL;
static const uint32_t cFileBlockMask = 0xfffff000;
void CEncryptionManager::LoadCipherList()
{
if (CipherList)
return;
CipherList = new TCipherList;
CipherListRefCount++;
WIN32_FIND_DATA search;
TCHAR path[MAX_PATH * 8];
GetModuleFileName(NULL, path, sizeof(path));
TCHAR * file = _tcsrchr(path, '\\');
if (!file)
file = path;
_tcscpy_s(file, sizeof(path) / sizeof(path[0]) - (file - path), _T("\\plugins\\encryption\\*.dll"));
file += 20;
HANDLE hfinder = FindFirstFile(path, &search);
if (hfinder != INVALID_HANDLE_VALUE)
{
TCipherItem item;
TCipherInfo* (__cdecl *CipherInfoProc)(void *);
do {
_tcscpy_s(file, sizeof(path) / sizeof(path[0]) - (file - path), search.cFileName);
HMODULE hmod = LoadLibrary(path);
if (hmod)
{
CipherInfoProc = (TCipherInfo*(__cdecl*)(void*)) GetProcAddress(hmod, "CipherInfo");
if (CipherInfoProc)
{
TCipherInfo* info = CipherInfoProc(NULL);
if (info && (info->cbSize == sizeof(TCipherInfo)) && (CipherList->find(info->ID) == CipherList->end()))
{
item.ID = info->ID;
item.Name = _wcsdup(info->Name);
item.Description = _wcsdup(info->Description);
item.FilePath = _tcsdup(path);
item.FileName = item.FilePath + (file - path);
CipherList->insert(std::make_pair(item.ID, item));
}
}
FreeLibrary(hmod);
}
} while (FindNextFile(hfinder, &search));
FindClose(hfinder);
}
}
CEncryptionManager::CEncryptionManager()
{
m_Ciphers[CURRENT].Cipher = NULL;
m_Ciphers[OLD].Cipher = NULL;
m_Changing = false;
m_ChangingProcess = 0;
LoadCipherList();
}
CEncryptionManager::~CEncryptionManager()
{
if (m_Ciphers[CURRENT].Cipher)
delete m_Ciphers[CURRENT].Cipher;
m_Ciphers[CURRENT].Cipher = NULL;
if (m_Ciphers[OLD].Cipher)
delete m_Ciphers[OLD].Cipher;
m_Ciphers[OLD].Cipher = NULL;
CipherListRefCount--;
if (!CipherListRefCount)
{
TCipherList::iterator i = CipherList->begin();
while (i != CipherList->end())
{
free(i->second.Description);
free(i->second.Name);
free(i->second.FilePath);
// do not free Filename... it's a substring of FilePath
++i;
}
delete CipherList;
CipherList = NULL;
}
}
bool CEncryptionManager::InitEncryption(TFileEncryption & Enc)
{
if (Enc.ConversionProcess)
{
m_Changing = true;
m_ChangingProcess = Enc.ConversionProcess;
}
for (int c = (int)CURRENT; c < (int)COUNT; c++)
{
TCipherList::iterator i = CipherList->find(Enc.CipherID);
if (i != CipherList->end())
{
m_Ciphers[c].CipherDLL = LoadLibrary(i->second.FilePath);
if (m_Ciphers[c].CipherDLL)
{
TCipherInfo* (__cdecl *cipherinfoproc)(void *);
cipherinfoproc = (TCipherInfo*(__cdecl*)(void*)) GetProcAddress(m_Ciphers[c].CipherDLL, "CipherInfo");
if (cipherinfoproc)
{
TCipherInfo* info = cipherinfoproc(NULL);
if (info && (info->cbSize == sizeof(TCipherInfo)))
m_Ciphers[c].Cipher = new CCipher(info->Create());
}
if (!m_Ciphers[c].Cipher)
{
FreeLibrary(m_Ciphers[c].CipherDLL);
m_Ciphers[c].CipherDLL = NULL;
}
}
}
}
return true;
}
bool CEncryptionManager::AlignData(uint32_t ID, uint32_t & Start, uint32_t & End)
{
if (m_Ciphers[CURRENT].Cipher && (!m_Changing || (ID < m_ChangingProcess)))
{
if (m_Ciphers[CURRENT].Cipher->IsStreamCipher())
{
Start = 0;
End = End - End % m_Ciphers[CURRENT].Cipher->BlockSizeBytes() + m_Ciphers[CURRENT].Cipher->BlockSizeBytes();
} else {
Start = Start - Start % m_Ciphers[CURRENT].Cipher->BlockSizeBytes();
if (End % m_Ciphers[CURRENT].Cipher->BlockSizeBytes())
End = End - End % m_Ciphers[CURRENT].Cipher->BlockSizeBytes() + m_Ciphers[CURRENT].Cipher->BlockSizeBytes();
}
return true;
} else if (m_Ciphers[OLD].Cipher && m_Changing && (ID >= m_ChangingProcess))
{
if (m_Ciphers[OLD].Cipher->IsStreamCipher())
{
Start = 0;
End = End - End % m_Ciphers[OLD].Cipher->BlockSizeBytes() + m_Ciphers[OLD].Cipher->BlockSizeBytes();
} else {
Start = Start - Start % m_Ciphers[OLD].Cipher->BlockSizeBytes();
if (End % m_Ciphers[OLD].Cipher->BlockSizeBytes())
End = End - End % m_Ciphers[OLD].Cipher->BlockSizeBytes() + m_Ciphers[OLD].Cipher->BlockSizeBytes();
}
return true;
}
return false;
}
uint32_t CEncryptionManager::AlignSize(uint32_t ID, uint32_t Size)
{
if (m_Ciphers[CURRENT].Cipher && (!m_Changing || (ID < m_ChangingProcess)))
{
if (Size % m_Ciphers[CURRENT].Cipher->BlockSizeBytes())
return Size - Size % m_Ciphers[CURRENT].Cipher->BlockSizeBytes() + m_Ciphers[CURRENT].Cipher->BlockSizeBytes();
} else if (m_Ciphers[OLD].Cipher && m_Changing && (ID >= m_ChangingProcess))
{
if (Size % m_Ciphers[OLD].Cipher->BlockSizeBytes())
return Size - Size % m_Ciphers[OLD].Cipher->BlockSizeBytes() + m_Ciphers[OLD].Cipher->BlockSizeBytes();
}
return Size;
}
bool CEncryptionManager::IsEncrypted(uint32_t ID)
{
return (m_Ciphers[CURRENT].Cipher && (!m_Changing || (ID < m_ChangingProcess))) ||
(m_Ciphers[OLD].Cipher && m_Changing && (ID >= m_ChangingProcess));
}
void CEncryptionManager::Encrypt(void* Data, uint32_t DataLength, uint32_t ID, uint32_t StartByte)
{
if (m_Ciphers[CURRENT].Cipher && (!m_Changing || (ID < m_ChangingProcess)))
{
m_Ciphers[CURRENT].Cipher->Encrypt(Data, DataLength, ID, StartByte);
} else if (m_Ciphers[OLD].Cipher && m_Changing && (ID >= m_ChangingProcess))
{
m_Ciphers[OLD].Cipher->Encrypt(Data, DataLength, ID, StartByte);
}
}
void CEncryptionManager::Decrypt(void* Data, uint32_t DataLength, uint32_t ID, uint32_t StartByte)
{
if (m_Ciphers[CURRENT].Cipher && (!m_Changing || (ID < m_ChangingProcess)))
{
m_Ciphers[CURRENT].Cipher->Decrypt(Data, DataLength, ID, StartByte);
} else if (m_Ciphers[OLD].Cipher && m_Changing && (ID >= m_ChangingProcess))
{
m_Ciphers[OLD].Cipher->Decrypt(Data, DataLength, ID, StartByte);
}
}
bool CEncryptionManager::CanChangeCipher()
{
return false;
}
bool CEncryptionManager::ChangeCipher(TEncryption & Encryption)
{
return false;
}
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