//解密数据
WORD CServerSocketItem::CrevasseBuffer(BYTE pcbDataBuffer[], WORD wDataSize)
{
WORD i = 0;
//效验参数
ASSERT(wDataSize>=sizeof(CMD_Head));
ASSERT(((CMD_Head *)pcbDataBuffer)->CmdInfo.wPacketSize==wDataSize);
//调整长度
WORD wSnapCount=0;
if ((wDataSize%sizeof(DWORD))!=0)
{
wSnapCount=sizeof(DWORD)-wDataSize%sizeof(DWORD);
memset(pcbDataBuffer+wDataSize,0,wSnapCount);
}
//提取密钥
if (m_dwRecvPacketCount==0)
{
ASSERT(wDataSize>=(sizeof(CMD_Head)+sizeof(DWORD)));
if (wDataSize<(sizeof(CMD_Head)+sizeof(DWORD))) throw TEXT("数据包解密长度错误");
m_dwRecvXorKey=*(DWORD *)(pcbDataBuffer+sizeof(CMD_Head));
m_dwSendXorKey=m_dwRecvXorKey;
MoveMemory(pcbDataBuffer+sizeof(CMD_Head),pcbDataBuffer+sizeof(CMD_Head)+sizeof(DWORD),
wDataSize-sizeof(CMD_Head)-sizeof(DWORD));
wDataSize-=sizeof(DWORD);
((CMD_Head *)pcbDataBuffer)->CmdInfo.wPacketSize-=sizeof(DWORD);
}
//解密数据
DWORD dwXorKey=m_dwRecvXorKey;
DWORD * pdwXor=(DWORD *)(pcbDataBuffer+sizeof(CMD_Info));
WORD * pwSeed=(WORD *)(pcbDataBuffer+sizeof(CMD_Info));
WORD wEncrypCount=(wDataSize+wSnapCount-sizeof(CMD_Info))/4;
for (i=0;i<wEncrypCount;i++)
{
if ((i==(wEncrypCount-1))&&(wSnapCount>0))
{
BYTE * pcbKey=((BYTE *)&m_dwRecvXorKey)+sizeof(DWORD)-wSnapCount;
CopyMemory(pcbDataBuffer+wDataSize,pcbKey,wSnapCount);
}
dwXorKey=SeedRandMap(*pwSeed++);
dwXorKey|=((DWORD)SeedRandMap(*pwSeed++))<<16;
dwXorKey^=g_dwPacketKey;
*pdwXor++^=m_dwRecvXorKey;
m_dwRecvXorKey=dwXorKey;
}
//效验码与字节映射
CMD_Head * pHead=(CMD_Head *)pcbDataBuffer;
BYTE cbCheckCode=pHead->CmdInfo.cbCheckCode;;
for (i=sizeof(CMD_Info);i<wDataSize;i++)
{
pcbDataBuffer[i]=MapRecvByte(pcbDataBuffer[i]);
cbCheckCode+=pcbDataBuffer[i];
}
if (cbCheckCode!=0) throw TEXT("数据包效验码错误");
return wDataSize;
}
//解密数据
WORD CCNetDelegate::CrevasseBuffer(BYTE* pcbDataBuffer,WORD wDataSize)
{
//调整长度
WORD wSnapCount=0;
if ((wDataSize%sizeof(DWORD))!=0)
{
wSnapCount=sizeof(DWORD)-wDataSize%sizeof(DWORD);
memset(pcbDataBuffer+wDataSize,0,wSnapCount);
}
//解密数据
DWORD dwXorKey=m_dwRecvXorKey;
DWORD * pdwXor=(DWORD *)(pcbDataBuffer+4);
WORD * pwSeed=(WORD *)(pcbDataBuffer+4);
WORD wEncrypCount=(wDataSize+wSnapCount-4)/4;
for (WORD i=0;i<wEncrypCount;i++)
{
if ((i==(wEncrypCount-1))&&(wSnapCount>0))
{
BYTE * pcbKey=((BYTE *)&m_dwRecvXorKey)+sizeof(DWORD)-wSnapCount;
memcpy(pcbDataBuffer+wDataSize,pcbKey,wSnapCount);
}
dwXorKey=SeedRandMap(*pwSeed++);
dwXorKey|=((DWORD)SeedRandMap(*pwSeed++))<<16;
dwXorKey^=g_dwPacketKey;
*pdwXor++^=m_dwRecvXorKey;
m_dwRecvXorKey=dwXorKey;
}
//效验码与字节映射
struct CMD_Head * pHead=(struct CMD_Head *)pcbDataBuffer;
BYTE cbCheckCode=pHead->CmdInfo.cbCheckCode;
for (int i=4;i<wDataSize;i++)
{
pcbDataBuffer[i]=MapRecvByte(pcbDataBuffer[i]);
cbCheckCode+=pcbDataBuffer[i];
}
// if (cbCheckCode!=0) throw TEXT("数据包效验码错误");
return wDataSize;
}
