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/*------------------------------------------------------------------------
* (The MIT License)
*
* Copyright (c) 2008-2011 Rhomobile, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* http://rhomobile.com
*------------------------------------------------------------------------*/
#include "StdAfx.h"
#include "RhoCryptImpl.h"
#include "common/RhodesApp.h"
namespace rho{
namespace common{
IMPLEMENT_LOGCLASS(CRhoCryptImpl,"RhoCrypt");
#define checkError(func) _checkError(func, #func)
CRhoCryptImpl::CRhoCryptImpl(void) : m_hCryptProv(0), m_hKey(0)
{
}
CRhoCryptImpl::~CRhoCryptImpl(void)
{
if ( m_hKey )
CryptDestroyKey(m_hKey);
if ( m_hCryptProv )
CryptReleaseContext( m_hCryptProv, 0 );
}
bool CRhoCryptImpl::_checkError( BOOL bRes, const char* szFunc )
{
m_dwLastError = 0;
if ( !bRes )
m_dwLastError = GetLastError();
if ( m_dwLastError == 0 )
return true;
LPTSTR pszMessage = NULL;
DWORD dwLen = FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
//FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_FROM_HMODULE|
FORMAT_MESSAGE_IGNORE_INSERTS,
#if defined(_WIN32_WCE)
GetModuleHandle( _T("Coredll.dll") ),
#else
GetModuleHandle( _T("Advapi32.dll") ),
#endif
m_dwLastError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&pszMessage,
0, NULL );
LOG(ERROR) + szFunc + "failed with code: " + LOGFMT("0x%X") + m_dwLastError + ";Message: " + (pszMessage ? pszMessage : _T(""));
if ( pszMessage )
LocalFree(pszMessage);
return false;
}
void CRhoCryptImpl::readKeyFromStorage(DATA_BLOB& blobKey)
{
StringW strKey = L"Software\\Rhomobile\\";
strKey += RHODESAPP().getAppNameW() + L"\\Storage\\" + m_strDBPartition;
CRegKey oKey;
LONG res = oKey.Open(HKEY_CURRENT_USER, strKey.c_str(), KEY_READ);
if ( res != ERROR_SUCCESS )
return;
ULONG nBytes = 0;
res = oKey.QueryBinaryValue(L"DataKey", 0, &nBytes );
if ( res != ERROR_SUCCESS )
return;
blobKey.cbData = nBytes;
blobKey.pbData = (BYTE*)LocalAlloc(LMEM_FIXED, nBytes);
res = oKey.QueryBinaryValue(L"DataKey", blobKey.pbData, &nBytes );
}
void CRhoCryptImpl::saveKeyToStorage(DATA_BLOB& blobKey)
{
LONG res = 0;
StringW strKey = L"Software\\Rhomobile\\";
strKey += RHODESAPP().getAppNameW() + L"\\Storage\\" + m_strDBPartition;
{
CRegKey oKey;
res = oKey.Create(HKEY_CURRENT_USER, strKey.c_str() );
}
CRegKey oKey;
res = oKey.Open(HKEY_CURRENT_USER, strKey.c_str(), KEY_WRITE);
if ( res != ERROR_SUCCESS )
return;
res = oKey.SetBinaryValue(L"DataKey", blobKey.pbData, blobKey.cbData );
if ( res != ERROR_SUCCESS )
return;
}
void CRhoCryptImpl::writeKeyToStorage()
{
BYTE *pbKeyBlob = NULL;
DWORD dwBlobLen = 0;
if ( !checkError( CryptExportKey(m_hKey, 0, PLAINTEXTKEYBLOB, 0, NULL, &dwBlobLen)) )
return;
pbKeyBlob = (BYTE*)malloc(dwBlobLen);
checkError( CryptExportKey(m_hKey, 0, PLAINTEXTKEYBLOB, 0, pbKeyBlob, &dwBlobLen) );
DATA_BLOB unprotectedKey = {dwBlobLen , pbKeyBlob };
DATA_BLOB protectedKey = {0};
checkError( CryptProtectData( &unprotectedKey, L"Rhodes data key", 0, 0, 0, 0, &protectedKey ) );
if (pbKeyBlob)
free(pbKeyBlob);
saveKeyToStorage(protectedKey);
if ( protectedKey.pbData )
LocalFree(protectedKey.pbData);
}
void CRhoCryptImpl::initCryptProvider()
{
if ( m_hCryptProv )
return;
LPCTSTR szContName = _T("RhodesKeyContainer"); // Name of the key container to be used.
checkError( CryptAcquireContext( &m_hCryptProv, szContName, NULL, PROV_RSA_AES, 0) );
if ( getErrorCode() == NTE_BAD_KEYSET )
{
checkError( CryptAcquireContext( &m_hCryptProv, szContName, NULL, PROV_RSA_AES, CRYPT_NEWKEYSET) );
}
}
void CRhoCryptImpl::initContext(const char* szPartition)
{
if ( m_hCryptProv )
return;
convertToStringW(szPartition, m_strDBPartition);
initCryptProvider();
if ( getErrorCode() != 0 )
return;
DATA_BLOB protectedKey = {0};
readKeyFromStorage(protectedKey);
if ( protectedKey.cbData > 0 )
{
DATA_BLOB unprotectedKey = {0};
LPWSTR pDescr = NULL;
checkError(CryptUnprotectData( &protectedKey, &pDescr, NULL, NULL, NULL, 0, &unprotectedKey));
checkError(CryptImportKey(m_hCryptProv, unprotectedKey.pbData, unprotectedKey.cbData, 0, 0, &m_hKey));
if( pDescr )
LocalFree(pDescr);
if ( unprotectedKey.pbData )
LocalFree(unprotectedKey.pbData);
if ( protectedKey.pbData )
LocalFree(protectedKey.pbData);
}else
{
//generate new key
if ( checkError(CryptGenKey(m_hCryptProv, CALG_RC4, CRYPT_EXPORTABLE, &m_hKey)) )
{
//DWORD dwPadding = ZERO_PADDING;
//checkError( CryptSetKeyParam( m_hKey, KP_PADDING, (const BYTE*)&dwPadding, 0) );
writeKeyToStorage();
}
}
}
int CRhoCryptImpl::db_encrypt( const char* szPartition, int size, unsigned char* data, unsigned char* dataOut )
{
initContext(szPartition);
memcpy(dataOut, data, size);
DWORD dwSize = size;
if ( m_hKey )
{
checkError( CryptEncrypt( m_hKey,
0, // No hashing of data
TRUE, // Final or only buffer of data
0, // Must be zero
dataOut, // Data buffer
&dwSize, // Size of data
dwSize // Size of block
));
}
return getErrorCode() == 0 ? 1 : 0;
}
int CRhoCryptImpl::db_decrypt( const char* szPartition, int size, unsigned char* data )
{
initContext(szPartition);
DWORD dwSize = size;
if ( m_hKey )
{
checkError( CryptDecrypt( m_hKey,
0, // No hashing of data
TRUE, // Final or only buffer of data
0, // Must be zero
data, // Data buffer
&dwSize // Size of data
));
}
return getErrorCode() == 0 ? 1 : 0;
}
int CRhoCryptImpl::set_db_CryptKey( const char* szPartition, const char* szKey, bool bPersistent )
{
convertToStringW(szPartition, m_strDBPartition);
int dwBlobLen = rho_base64_decode( szKey, -1, 0 );
BYTE* pbKeyBlob = (BYTE*)malloc(dwBlobLen);
rho_base64_decode(szKey, -1, (char*)pbKeyBlob);
DATA_BLOB unprotectedKey = {dwBlobLen , pbKeyBlob };
if ( !bPersistent )
{
initCryptProvider();
checkError(CryptImportKey(m_hCryptProv, unprotectedKey.pbData, unprotectedKey.cbData, 0, 0, &m_hKey));
}else
{
DATA_BLOB protectedKey = {0};
checkError( CryptProtectData( &unprotectedKey, L"Rhodes data key", 0, 0, 0, 0, &protectedKey ) );
if (pbKeyBlob)
free(pbKeyBlob);
saveKeyToStorage(protectedKey);
if ( protectedKey.pbData )
LocalFree(protectedKey.pbData);
}
return 1;
}
}
}