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/*****************************************************************************/
/* cmf.cpp Copyright (c) Ladislav Zezula 2023 */
/*---------------------------------------------------------------------------*/
/* Support for Content Manifest Files (.cmf) */
/* Know-how from https://github.com/overtools/TACTLib */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* 29.07.23 1.00 Lad Created */
/*****************************************************************************/
#define __CASCLIB_SELF__
#include "../CascLib.h"
#include "../CascCommon.h"
#include "aes.h"
#include "overwatch.h"
//-----------------------------------------------------------------------------
// Encryption key providers for CMF files. These are taken from TACTLib
// with the kind permission of the TACTLib authors
// (https://github.com/overtools/TACTLib)
// Key and IV provider functions
typedef LPBYTE(*GET_KEY)(const CASC_CMF_HEADER & Header, LPBYTE pbKey, int nLength);
typedef LPBYTE(*GET_IV)(const CASC_CMF_HEADER & Header, LPBYTE nameSha1, LPBYTE pbKey, int nLength);
// Structure for the single provider
typedef struct _CASC_CMF_KEY_PROVIDER
{
DWORD dwBuildNumber;
GET_KEY PfnGetKey;
GET_IV PfnGetIV;
} CASC_CMF_KEY_PROVIDER;
typedef const CASC_CMF_KEY_PROVIDER *PCASC_CMF_KEY_PROVIDER;
// Needed by various providers in the cmf-key.cpp file
struct TMath
{
template <typename TYPE>
TYPE Max(TYPE value1, TYPE value2)
{
return (value1 > value2) ? value1 : value2;
}
DWORD dwDummy;
} Math;
// Needed by various providers in the cmf-key.cpp file
static uint Constrain(LONGLONG value)
{
return (uint)(value % 0xFFFFFFFFULL);
}
// Needed by various providers in the cmf-key.cpp file
static int SignedMod(LONGLONG p1, LONGLONG p2)
{
int a = (int)p1;
int b = (int)p2;
return (a % b) < 0 ? (a % b + b) : (a % b);
}
// Include the CMF key provider functions and the table of providers
// This file is created by the "cmf-update.py" script, DO NOT EDIT.
#include "cmf-key.cpp"
//-----------------------------------------------------------------------------
// Local functions
static PCASC_CMF_KEY_PROVIDER FindCmfKeyProvider(DWORD dwBuildNumber)
{
PCASC_CMF_KEY_PROVIDER pStartEntry = CmfKeyProviders;
PCASC_CMF_KEY_PROVIDER pMidleEntry = NULL;
PCASC_CMF_KEY_PROVIDER pFinalEntry = &CmfKeyProviders[_countof(CmfKeyProviders)];
// Perform binary search on the table
while(pStartEntry < pFinalEntry)
{
// Calculate the middle of the interval
pMidleEntry = pStartEntry + ((pFinalEntry - pStartEntry) / 2);
// Did we find it?
if(dwBuildNumber == pMidleEntry->dwBuildNumber)
return pMidleEntry;
// Move the interval to the left or right
if(dwBuildNumber > pMidleEntry->dwBuildNumber)
pStartEntry = pMidleEntry + 1;
else
pFinalEntry = pMidleEntry;
}
/*
for(size_t i = 0; i < _countof(CmfKeyProviders); i++)
{
if(CmfKeyProviders[i].dwBuildNumber == dwBuildNumber)
{
return &CmfKeyProviders[i];
}
}
*/
return NULL;
}
static DWORD DecryptCmfStream(const CASC_CMF_HEADER & Header, const char * szPlainName, LPBYTE pbDataPtr, LPBYTE pbDataEnd)
{
PCASC_CMF_KEY_PROVIDER pKeyProvider;
AES_KEY AesKey;
BYTE RawKey[CASC_AES_KEY_LENGTH];
BYTE RawIV[CASC_AES_IV_LENGTH];
BYTE nameDigest[SHA1_HASH_SIZE];
// Find the provider for that Overwatch build
if((pKeyProvider = FindCmfKeyProvider(Header.m_buildVersion)) == NULL)
return ERROR_FILE_ENCRYPTED;
// Create SHA1 from the file name
CascHash_SHA1(szPlainName, strlen(szPlainName), nameDigest);
// Retrieve key and IV
pKeyProvider->PfnGetKey(Header, RawKey, sizeof(RawKey));
pKeyProvider->PfnGetIV(Header, nameDigest, RawIV, sizeof(RawIV));
// Decrypt the stream using AES
AES_set_decrypt_key(RawKey, 256, &AesKey);
AES_cbc_decrypt(pbDataPtr, pbDataPtr, (pbDataEnd - pbDataPtr), &AesKey, RawIV);
return ERROR_SUCCESS;
}
//-----------------------------------------------------------------------------
// Public functions
DWORD LoadContentManifestFile(TCascStorage * hs, CASC_FILE_TREE & FileTree, PCASC_CKEY_ENTRY pCKeyEntry, const char * szCmfFileName)
{
CASC_BLOB CmfFile;
const char * szCmfPlainName = GetPlainFileName(szCmfFileName);
DWORD dwErrCode;
// Load the entire internal file to memory
if((dwErrCode = LoadInternalFileToMemory(hs, pCKeyEntry, CmfFile)) == ERROR_SUCCESS)
{
PCASC_APM_ENTRY_V2 pApmEntries = NULL;
CASC_CMF_HEADER CmfHeader = {0};
LPBYTE pbDataEnd = CmfFile.pbData + CmfFile.cbData;
LPBYTE pbDataPtr = CmfFile.pbData;
size_t nPlainName;
DWORD dwBuildVersion;
char szFileName[MAX_PATH];
// Get the build version
if((pbDataPtr = CaptureInteger32(pbDataPtr, pbDataEnd, &dwBuildVersion)) == NULL)
return ERROR_BAD_FORMAT;
pbDataPtr = CmfFile.pbData;
// Parse headers of various versions
if(dwBuildVersion > CASC_OVERWATCH_VERSION_148_PTR)
{
CASC_CMF_HEADER_148 * pHeader148;
if((pbDataPtr = CaptureStructure(pbDataPtr, pbDataEnd, &pHeader148)) == NULL)
return ERROR_BAD_FORMAT;
CmfHeader = *pHeader148;
}
else if(dwBuildVersion > CASC_OVERWATCH_VERSION_122_PTR)
{
CASC_CMF_HEADER_122 * pHeader122;
if((pbDataPtr = CaptureStructure(pbDataPtr, pbDataEnd, &pHeader122)) == NULL)
return ERROR_BAD_FORMAT;
CmfHeader = *pHeader122;
}
else
{
CASC_CMF_HEADER_100 * pHeader100;
if((pbDataPtr = CaptureStructure(pbDataPtr, pbDataEnd, &pHeader100)) == NULL)
return ERROR_BAD_FORMAT;
CmfHeader = *pHeader100;
}
// Decrypt the stream, if needed
if(CmfHeader.IsEncrypted())
{
if((dwErrCode = DecryptCmfStream(CmfHeader, szCmfPlainName, pbDataPtr, pbDataEnd)) != ERROR_SUCCESS)
{
return dwErrCode;
}
}
// Skip APM entries. We don't need them for anything, really
if((pbDataPtr = CaptureArray(pbDataPtr, pbDataEnd, &pApmEntries, CmfHeader.m_entryCount)) == NULL)
{
return ERROR_BAD_FORMAT;
}
// Create the name template of the assets
nPlainName = BuildAssetFileNameTemplate(szFileName,
_countof(szFileName),
"ContentManifestFiles",
szCmfPlainName);
// Load the hash list This is the list of Asset ID -> CKey
if(CmfHeader.m_buildVersion >= 57230)
{
PCASC_CMF_HASH_ENTRY_135 pHashList;
if((pbDataPtr = CaptureArray(pbDataPtr, pbDataEnd, &pHashList, CmfHeader.m_dataCount)) == NULL)
return ERROR_BAD_FORMAT;
dwErrCode = InsertAssetFiles(hs, FileTree, szFileName, nPlainName, pHashList, CmfHeader.m_dataCount);
}
else
{
PCASC_CMF_HASH_ENTRY_100 pHashList;
if((pbDataPtr = CaptureArray(pbDataPtr, pbDataEnd, &pHashList, CmfHeader.m_dataCount)) == NULL)
return ERROR_BAD_FORMAT;
dwErrCode = InsertAssetFiles(hs, FileTree, szFileName, nPlainName, pHashList, CmfHeader.m_dataCount);
}
}
return dwErrCode;
}
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