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Do protocol decryption in-place (with CryptoAPI on Windows) (#5145)

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This commit is contained in:
Tiger Wang 2021-03-08 16:37:36 +00:00 committed by GitHub
parent 3daf253b7f
commit 01a4e696b3
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 206 additions and 174 deletions
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4
Tools/ProtoProxy/Connection.cpp
View File

@ -376,13 +376,13 @@ bool cConnection::RelayFromServer(void)
}
case csEncryptedUnderstood:
{
m_ServerDecryptor.ProcessData(reinterpret_cast<std::byte *>(Buffer), reinterpret_cast<const Byte *>(Buffer), static_cast<size_t>(res));
m_ServerDecryptor.ProcessData(reinterpret_cast<std::byte *>(Buffer), static_cast<size_t>(res));
DataLog(Buffer, static_cast<size_t>(res), "Decrypted %d bytes from the SERVER", res);
return DecodeServersPackets(Buffer, res);
}
case csEncryptedUnknown:
{
m_ServerDecryptor.ProcessData(reinterpret_cast<std::byte *>(Buffer), reinterpret_cast<const Byte *>(Buffer), static_cast<size_t>(res));
m_ServerDecryptor.ProcessData(reinterpret_cast<std::byte *>(Buffer), static_cast<size_t>(res));
DataLog(Buffer, static_cast<size_t>(res), "Decrypted %d bytes from the SERVER", res);
return CLIENTSEND({ reinterpret_cast<const std::byte *>(Buffer), static_cast<size_t>(res) });
}

6
src/ClientHandle.cpp
View File

@ -3299,7 +3299,7 @@ bool cClientHandle::SetState(eState a_NewState)
void cClientHandle::ProcessProtocolIn(void)
{
// Process received network data:
AString IncomingData;
decltype(m_IncomingData) IncomingData;
{
cCSLock Lock(m_CSIncomingData);
std::swap(IncomingData, m_IncomingData);
@ -3312,7 +3312,7 @@ void cClientHandle::ProcessProtocolIn(void)
try
{
m_Protocol.HandleIncomingData(*this, IncomingData);
m_Protocol.HandleIncomingData(*this, std::move(IncomingData));
}
catch (const std::exception & Oops)
{
@ -3340,7 +3340,7 @@ void cClientHandle::OnReceivedData(const char * a_Data, size_t a_Length)
// Queue the incoming data to be processed in the tick thread:
cCSLock Lock(m_CSIncomingData);
m_IncomingData.append(a_Data, a_Length);
m_IncomingData.append(reinterpret_cast<const std::byte *>(a_Data), a_Length);
}

2
src/ClientHandle.h
View File

@ -445,7 +445,7 @@ private:
/** Queue for the incoming data received on the link until it is processed in Tick().
Protected by m_CSIncomingData. */
AString m_IncomingData;
ContiguousByteBuffer m_IncomingData;
/** Protects m_OutgoingData against multithreaded access. */
cCriticalSection m_CSOutgoingData;

6
src/Protocol/Protocol.h
View File

@ -48,6 +48,7 @@ typedef unsigned char Byte;
class cProtocol
{
public:
cProtocol(cClientHandle * a_Client) :
m_Client(a_Client),
m_OutPacketBuffer(64 KiB),
@ -354,8 +355,9 @@ public:
Game = 3,
};
/** Called when client sends some data */
virtual void DataReceived(cByteBuffer & a_Buffer, const char * a_Data, size_t a_Size) = 0;
/** Called to process them, when client sends some data.
The protocol uses the provided buffers for storage and processing, and must have exclusive access to them. */
virtual void DataReceived(cByteBuffer & a_Buffer, ContiguousByteBuffer && a_Data) = 0;
// Sending stuff to clients (alphabetically sorted):
virtual void SendAttachEntity (const cEntity & a_Entity, const cEntity & a_Vehicle) = 0;

14
src/Protocol/ProtocolRecognizer.cpp
View File

@ -76,7 +76,7 @@ AString cMultiVersionProtocol::GetVersionTextFromInt(cProtocol::Version a_Protoc
void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle & a_Client, std::string_view a_Data)
void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle & a_Client, ContiguousByteBuffer && a_Data)
{
// NOTE: If a new protocol is added or an old one is removed, adjust MCS_CLIENT_VERSIONS and MCS_PROTOCOL_VERSIONS macros in the header file
@ -113,13 +113,13 @@ void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle &
1. m_Protocol != nullptr: the protocol is supported and we have a handler
2. m_Protocol == nullptr: the protocol is unsupported, handling is a special case done by ourselves
3. Exception: the data sent were garbage, the client handle deals with it by disconnecting */
m_Protocol = TryRecognizeLengthedProtocol(a_Client, a_Data);
m_Protocol = TryRecognizeLengthedProtocol(a_Client);
if (m_Protocol == nullptr)
{
// Got a server list ping for an unrecognised version,
// switch into responding to unknown protocols mode:
HandleIncomingData = [this](cClientHandle & a_Clyent, const std::string_view a_In)
HandleIncomingData = [this](cClientHandle & a_Clyent, ContiguousByteBuffer && a_In)
{
HandleIncomingDataInOldPingResponseStage(a_Clyent, a_In);
};
@ -127,9 +127,9 @@ void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle &
else
{
// The protocol recogniser succesfully identified, switch mode:
HandleIncomingData = [this](cClientHandle &, const std::string_view a_In)
HandleIncomingData = [this](cClientHandle &, ContiguousByteBuffer && a_In)
{
m_Protocol->DataReceived(m_Buffer, a_In.data(), a_In.size());
m_Protocol->DataReceived(m_Buffer, std::move(a_In));
};
}
@ -141,7 +141,7 @@ void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle &
void cMultiVersionProtocol::HandleIncomingDataInOldPingResponseStage(cClientHandle & a_Client, const std::string_view a_Data)
void cMultiVersionProtocol::HandleIncomingDataInOldPingResponseStage(cClientHandle & a_Client, const ContiguousByteBufferView a_Data)
{
if (!m_Buffer.Write(a_Data.data(), a_Data.size()))
{
@ -215,7 +215,7 @@ void cMultiVersionProtocol::SendDisconnect(cClientHandle & a_Client, const AStri
std::unique_ptr<cProtocol> cMultiVersionProtocol::TryRecognizeLengthedProtocol(cClientHandle & a_Client, const std::string_view a_Data)
std::unique_ptr<cProtocol> cMultiVersionProtocol::TryRecognizeLengthedProtocol(cClientHandle & a_Client)
{
UInt32 PacketType;
UInt32 ProtocolVersion;

11
src/Protocol/ProtocolRecognizer.h
View File

@ -19,6 +19,9 @@
protocol version instance and redirects everything to it. */
class cMultiVersionProtocol
{
// Work around the style checker complaining about && in template.
using OwnedContiguousByteBuffer = ContiguousByteBuffer &&;
public:
cMultiVersionProtocol();
@ -39,7 +42,7 @@ public:
}
/** The function that's responsible for processing incoming protocol data. */
std::function<void(cClientHandle &, std::string_view)> HandleIncomingData;
std::function<void(cClientHandle &, OwnedContiguousByteBuffer)> HandleIncomingData;
/** Sends a disconnect to the client as a result of a recognition error.
This function can be used to disconnect before any protocol has been recognised. */
@ -50,14 +53,14 @@ private:
/** Handles data reception in a newly-created client handle that doesn't yet have a known protocol.
a_Data contains a view of data that were just received.
Tries to recognize a protocol, populate m_Protocol, and transitions to another mode depending on success. */
void HandleIncomingDataInRecognitionStage(cClientHandle & a_Client, std::string_view a_Data);
void HandleIncomingDataInRecognitionStage(cClientHandle & a_Client, ContiguousByteBuffer && a_Data);
/** Handles and responds to unsupported clients sending pings. */
void HandleIncomingDataInOldPingResponseStage(cClientHandle & a_Client, std::string_view a_Data);
void HandleIncomingDataInOldPingResponseStage(cClientHandle & a_Client, ContiguousByteBufferView a_Data);
/** Tries to recognize a protocol in the lengthed family (1.7+), based on m_Buffer.
Returns a cProtocol_XXX instance if recognized. */
std::unique_ptr<cProtocol> TryRecognizeLengthedProtocol(cClientHandle & a_Client, std::string_view a_Data);
std::unique_ptr<cProtocol> TryRecognizeLengthedProtocol(cClientHandle & a_Client);
/** Sends one packet inside a cByteBuffer.
This is used only when handling an outdated server ping. */

259
src/Protocol/Protocol_1_8.cpp
View File

@ -173,31 +173,14 @@ cProtocol_1_8_0::cProtocol_1_8_0(cClientHandle * a_Client, const AString & a_Ser
void cProtocol_1_8_0::DataReceived(cByteBuffer & a_Buffer, const char * a_Data, size_t a_Size)
void cProtocol_1_8_0::DataReceived(cByteBuffer & a_Buffer, ContiguousByteBuffer && a_Data)
{
if (m_IsEncrypted)
{
// An artefact of the protocol recogniser, will be removed when decryption done in-place:
if (a_Size == 0)
{
AddReceivedData(a_Buffer, nullptr, 0);
return;
}
m_Decryptor.ProcessData(a_Data.data(), a_Data.size());
}
std::byte Decrypted[512];
while (a_Size > 0)
{
size_t NumBytes = (a_Size > sizeof(Decrypted)) ? sizeof(Decrypted) : a_Size;
m_Decryptor.ProcessData(Decrypted, reinterpret_cast<const Byte *>(a_Data), NumBytes);
AddReceivedData(a_Buffer, reinterpret_cast<const char *>(Decrypted), NumBytes);
a_Size -= NumBytes;
a_Data += NumBytes;
}
}
else
{
AddReceivedData(a_Buffer, a_Data, a_Size);
}
AddReceivedData(a_Buffer, a_Data);
}
@ -2002,123 +1985,6 @@ UInt32 cProtocol_1_8_0::GetProtocolMobType(const eMonsterType a_MobType)
void cProtocol_1_8_0::AddReceivedData(cByteBuffer & a_Buffer, const char * a_Data, size_t a_Size)
{
// Write the incoming data into the comm log file:
if (g_ShouldLogCommIn && m_CommLogFile.IsOpen())
{
if (a_Buffer.GetReadableSpace() > 0)
{
ContiguousByteBuffer AllData;
size_t OldReadableSpace = a_Buffer.GetReadableSpace();
a_Buffer.ReadAll(AllData);
a_Buffer.ResetRead();
a_Buffer.SkipRead(a_Buffer.GetReadableSpace() - OldReadableSpace);
ASSERT(a_Buffer.GetReadableSpace() == OldReadableSpace);
AString Hex;
CreateHexDump(Hex, AllData.data(), AllData.size(), 16);
m_CommLogFile.Printf("Incoming data, %zu (0x%zx) unparsed bytes already present in buffer:\n%s\n",
AllData.size(), AllData.size(), Hex.c_str()
);
}
AString Hex;
CreateHexDump(Hex, a_Data, a_Size, 16);
m_CommLogFile.Printf("Incoming data: %u (0x%x) bytes: \n%s\n",
static_cast<unsigned>(a_Size), static_cast<unsigned>(a_Size), Hex.c_str()
);
m_CommLogFile.Flush();
}
if (!a_Buffer.Write(a_Data, a_Size))
{
// Too much data in the incoming queue, report to caller:
m_Client->PacketBufferFull();
return;
}
// Handle all complete packets:
for (;;)
{
UInt32 PacketLen;
if (!a_Buffer.ReadVarInt(PacketLen))
{
// Not enough data
a_Buffer.ResetRead();
break;
}
if (!a_Buffer.CanReadBytes(PacketLen))
{
// The full packet hasn't been received yet
a_Buffer.ResetRead();
break;
}
// Check packet for compression:
if (m_State == 3)
{
UInt32 NumBytesRead = static_cast<UInt32>(a_Buffer.GetReadableSpace());
UInt32 UncompressedSize;
if (!a_Buffer.ReadVarInt(UncompressedSize))
{
m_Client->Kick("Compression packet incomplete");
return;
}
NumBytesRead -= static_cast<UInt32>(a_Buffer.GetReadableSpace()); // How many bytes has the UncompressedSize taken up?
ASSERT(PacketLen > NumBytesRead);
PacketLen -= NumBytesRead;
if (UncompressedSize > 0)
{
// Decompress the data:
m_Extractor.ReadFrom(a_Buffer, PacketLen);
a_Buffer.CommitRead();
const auto UncompressedData = m_Extractor.Extract(UncompressedSize);
const auto Uncompressed = UncompressedData.GetView();
cByteBuffer bb(Uncompressed.size());
// Compression was used, move the uncompressed data:
VERIFY(bb.Write(Uncompressed.data(), Uncompressed.size()));
HandlePacket(bb);
continue;
}
}
// Move the packet payload to a separate cByteBuffer, bb:
cByteBuffer bb(PacketLen);
// No compression was used, move directly:
VERIFY(a_Buffer.ReadToByteBuffer(bb, static_cast<size_t>(PacketLen)));
a_Buffer.CommitRead();
HandlePacket(bb);
} // for (ever)
// Log any leftover bytes into the logfile:
if (g_ShouldLogCommIn && (a_Buffer.GetReadableSpace() > 0) && m_CommLogFile.IsOpen())
{
ContiguousByteBuffer AllData;
size_t OldReadableSpace = a_Buffer.GetReadableSpace();
a_Buffer.ReadAll(AllData);
a_Buffer.ResetRead();
a_Buffer.SkipRead(a_Buffer.GetReadableSpace() - OldReadableSpace);
ASSERT(a_Buffer.GetReadableSpace() == OldReadableSpace);
AString Hex;
CreateHexDump(Hex, AllData.data(), AllData.size(), 16);
m_CommLogFile.Printf("There are %zu (0x%zx) bytes of non-parse-able data left in the buffer:\n%s",
a_Buffer.GetReadableSpace(), a_Buffer.GetReadableSpace(), Hex.c_str()
);
m_CommLogFile.Flush();
}
}
UInt32 cProtocol_1_8_0::GetPacketID(ePacketType a_PacketType)
{
switch (a_PacketType)
@ -3961,6 +3827,123 @@ void cProtocol_1_8_0::WriteEntityProperties(cPacketizer & a_Pkt, const cEntity &
void cProtocol_1_8_0::AddReceivedData(cByteBuffer & a_Buffer, const ContiguousByteBufferView a_Data)
{
// Write the incoming data into the comm log file:
if (g_ShouldLogCommIn && m_CommLogFile.IsOpen())
{
if (a_Buffer.GetReadableSpace() > 0)
{
ContiguousByteBuffer AllData;
size_t OldReadableSpace = a_Buffer.GetReadableSpace();
a_Buffer.ReadAll(AllData);
a_Buffer.ResetRead();
a_Buffer.SkipRead(a_Buffer.GetReadableSpace() - OldReadableSpace);
ASSERT(a_Buffer.GetReadableSpace() == OldReadableSpace);
AString Hex;
CreateHexDump(Hex, AllData.data(), AllData.size(), 16);
m_CommLogFile.Printf("Incoming data, %zu (0x%zx) unparsed bytes already present in buffer:\n%s\n",
AllData.size(), AllData.size(), Hex.c_str()
);
}
AString Hex;
CreateHexDump(Hex, a_Data.data(), a_Data.size(), 16);
m_CommLogFile.Printf("Incoming data: %zu (0x%zx) bytes: \n%s\n",
a_Data.size(), a_Data.size(), Hex.c_str()
);
m_CommLogFile.Flush();
}
if (!a_Buffer.Write(a_Data.data(), a_Data.size()))
{
// Too much data in the incoming queue, report to caller:
m_Client->PacketBufferFull();
return;
}
// Handle all complete packets:
for (;;)
{
UInt32 PacketLen;
if (!a_Buffer.ReadVarInt(PacketLen))
{
// Not enough data
a_Buffer.ResetRead();
break;
}
if (!a_Buffer.CanReadBytes(PacketLen))
{
// The full packet hasn't been received yet
a_Buffer.ResetRead();
break;
}
// Check packet for compression:
if (m_State == 3)
{
UInt32 NumBytesRead = static_cast<UInt32>(a_Buffer.GetReadableSpace());
UInt32 UncompressedSize;
if (!a_Buffer.ReadVarInt(UncompressedSize))
{
m_Client->Kick("Compression packet incomplete");
return;
}
NumBytesRead -= static_cast<UInt32>(a_Buffer.GetReadableSpace()); // How many bytes has the UncompressedSize taken up?
ASSERT(PacketLen > NumBytesRead);
PacketLen -= NumBytesRead;
if (UncompressedSize > 0)
{
// Decompress the data:
m_Extractor.ReadFrom(a_Buffer, PacketLen);
a_Buffer.CommitRead();
const auto UncompressedData = m_Extractor.Extract(UncompressedSize);
const auto Uncompressed = UncompressedData.GetView();
cByteBuffer bb(Uncompressed.size());
// Compression was used, move the uncompressed data:
VERIFY(bb.Write(Uncompressed.data(), Uncompressed.size()));
HandlePacket(bb);
continue;
}
}
// Move the packet payload to a separate cByteBuffer, bb:
cByteBuffer bb(PacketLen);
// No compression was used, move directly:
VERIFY(a_Buffer.ReadToByteBuffer(bb, static_cast<size_t>(PacketLen)));
a_Buffer.CommitRead();
HandlePacket(bb);
} // for (ever)
// Log any leftover bytes into the logfile:
if (g_ShouldLogCommIn && (a_Buffer.GetReadableSpace() > 0) && m_CommLogFile.IsOpen())
{
ContiguousByteBuffer AllData;
size_t OldReadableSpace = a_Buffer.GetReadableSpace();
a_Buffer.ReadAll(AllData);
a_Buffer.ResetRead();
a_Buffer.SkipRead(a_Buffer.GetReadableSpace() - OldReadableSpace);
ASSERT(a_Buffer.GetReadableSpace() == OldReadableSpace);
AString Hex;
CreateHexDump(Hex, AllData.data(), AllData.size(), 16);
m_CommLogFile.Printf("There are %zu (0x%zx) bytes of non-parse-able data left in the buffer:\n%s",
a_Buffer.GetReadableSpace(), a_Buffer.GetReadableSpace(), Hex.c_str()
);
m_CommLogFile.Flush();
}
}
void cProtocol_1_8_0::HandlePacket(cByteBuffer & a_Buffer)
{
UInt32 PacketType;

11
src/Protocol/Protocol_1_8.h
View File

@ -36,8 +36,9 @@ public:
cProtocol_1_8_0(cClientHandle * a_Client, const AString & a_ServerAddress, State a_State);
/** Called when client sends some data: */
virtual void DataReceived(cByteBuffer & a_Buffer, const char * a_Data, size_t a_Size) override;
/** Called to process them, when client sends some data.
The protocol uses the provided buffers for storage and processing, and must have exclusive access to them. */
virtual void DataReceived(cByteBuffer & a_Buffer, ContiguousByteBuffer && a_Data) override;
/** Sending stuff to clients (alphabetically sorted): */
virtual void SendAttachEntity (const cEntity & a_Entity, const cEntity & a_Vehicle) override;
@ -146,9 +147,6 @@ protected:
/** State of the protocol. */
State m_State;
/** Adds the received (unencrypted) data to m_ReceivedData, parses complete packets */
virtual void AddReceivedData(cByteBuffer & a_Buffer, const char * a_Data, size_t a_Size);
/** Nobody inherits 1.8, so it doesn't use this method */
virtual UInt32 GetPacketID(ePacketType a_Packet) override;
@ -257,6 +255,9 @@ private:
/** The logfile where the comm is logged, when g_ShouldLogComm is true */
cFile m_CommLogFile;
/** Adds the received (unencrypted) data to m_ReceivedData, parses complete packets */
void AddReceivedData(cByteBuffer & a_Buffer, ContiguousByteBufferView a_Data);
/** Handle a complete packet stored in the given buffer. */
void HandlePacket(cByteBuffer & a_Buffer);

48
src/mbedTLS++/AesCfb128Decryptor.cpp
View File

@ -10,10 +10,17 @@
cAesCfb128Decryptor::cAesCfb128Decryptor(void):
cAesCfb128Decryptor::cAesCfb128Decryptor(void) :
m_IsValid(false)
{
#ifdef _WIN32
if (!CryptAcquireContext(&m_Aes, nullptr, nullptr, PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
{
throw std::system_error(GetLastError(), std::system_category());
}
#else
mbedtls_aes_init(&m_Aes);
#endif
}
@ -22,8 +29,12 @@ cAesCfb128Decryptor::cAesCfb128Decryptor(void):
cAesCfb128Decryptor::~cAesCfb128Decryptor()
{
// Clear the leftover in-memory data, so that they can't be accessed by a backdoor
// Clear the leftover in-memory data, so that they can't be accessed by a backdoor:
#ifdef _WIN32
CryptReleaseContext(m_Aes, 0);
#else
mbedtls_aes_free(&m_Aes);
#endif
}
@ -34,8 +45,27 @@ void cAesCfb128Decryptor::Init(const Byte a_Key[16], const Byte a_IV[16])
{
ASSERT(!IsValid()); // Cannot Init twice
memcpy(m_IV, a_IV, 16);
#ifdef _WIN32
struct Key
{
PUBLICKEYSTRUC Header;
DWORD Length;
Byte Key[16];
} Key;
const DWORD Mode = CRYPT_MODE_CFB;
Key.Header = { PLAINTEXTKEYBLOB, CUR_BLOB_VERSION, 0, CALG_AES_128 };
Key.Length = 16;
std::copy_n(a_Key, 16, Key.Key);
CryptImportKey(m_Aes, reinterpret_cast<const BYTE *>(&Key), sizeof(Key), 0, 0, &m_Key);
CryptSetKeyParam(m_Key, KP_MODE, reinterpret_cast<const BYTE *>(&Mode), 0);
CryptSetKeyParam(m_Key, KP_IV, a_IV, 0);
#else
std::copy_n(a_IV, 16, m_IV);
mbedtls_aes_setkey_enc(&m_Aes, a_Key, 128);
#endif
m_IsValid = true;
}
@ -43,8 +73,16 @@ void cAesCfb128Decryptor::Init(const Byte a_Key[16], const Byte a_IV[16])
void cAesCfb128Decryptor::ProcessData(std::byte * a_DecryptedOut, const Byte * a_EncryptedIn, size_t a_Length)
void cAesCfb128Decryptor::ProcessData(std::byte * const a_EncryptedIn, const size_t a_Length)
{
ASSERT(IsValid()); // Must Init() first
mbedtls_aes_crypt_cfb8(&m_Aes, MBEDTLS_AES_DECRYPT, a_Length, m_IV, a_EncryptedIn, reinterpret_cast<unsigned char *>(a_DecryptedOut));
#ifdef _WIN32
ASSERT(a_Length <= std::numeric_limits<DWORD>::max());
DWORD Length = static_cast<DWORD>(a_Length);
CryptDecrypt(m_Key, 0, FALSE, 0, reinterpret_cast<BYTE *>(a_EncryptedIn), &Length);
#else
mbedtls_aes_crypt_cfb8(&m_Aes, MBEDTLS_AES_DECRYPT, a_Length, m_IV, reinterpret_cast<unsigned char *>(a_EncryptedIn), reinterpret_cast<unsigned char *>(a_EncryptedIn));
#endif
}

19
src/mbedTLS++/AesCfb128Decryptor.h
View File

@ -9,7 +9,11 @@
#pragma once
#ifdef _WIN32
#include <wincrypt.h>
#else
#include "mbedtls/aes.h"
#endif
@ -26,14 +30,20 @@ public:
/** Initializes the decryptor with the specified Key / IV */
void Init(const Byte a_Key[16], const Byte a_IV[16]);
/** Decrypts a_Length bytes of the encrypted data; produces a_Length output bytes */
void ProcessData(std::byte * a_DecryptedOut, const Byte * a_EncryptedIn, size_t a_Length);
/** Decrypts a_Length bytes of the encrypted data in-place; produces a_Length output bytes */
void ProcessData(std::byte * a_EncryptedIn, size_t a_Length);
/** Returns true if the object has been initialized with the Key / IV */
bool IsValid(void) const { return m_IsValid; }
protected:
#ifdef _WIN32
HCRYPTPROV m_Aes;
HCRYPTKEY m_Key;
#else
mbedtls_aes_context m_Aes;
#endif
/** The InitialVector, used by the CFB mode decryption */
Byte m_IV[16];
@ -41,8 +51,3 @@ protected:
/** Indicates whether the object has been initialized with the Key / IV */
bool m_IsValid;
} ;