This is my setup:
...
ECB_Mode<AES>::Encryption m_Encryptor;
m_Encryptor.SetKey(key, sizeof(key);
StreamTransformationFilter* m_pStream = new StreamTransformationFilter
(m_Encryptor);
...
void CAESBase::Encrypt(const byte* _pData, int _iSize, byte*
_pBufferOut)
{
if (_pData && _pBufferOut)
{
m_pStream->Initialize();
m_pStream->Put(_pData, _iSize);
m_pStream->MessageEnd();
int iSize = m_pStream->TotalBytesRetrievable();
if (_pBufferOut->Init(iSize) == RET_OK)
{
byte* pOut = (byte*) _pBufferOut->GetNextPtrToWrite(iSize);
m_pStream->Get(pOut, iSize);
}
}
}
When I call the Encrypt method, if _iSize is an exact multiple of
block size (16 bytes), the StreamTransformationFilter adds one full
block of padding data, so when I call TotalBytesRetrievable I get
_iSize + 16.
I've been debugging through Crypto++ code and I think it should be
necessary to check the remaining data size in m_queue before calling
LastPut from FilterWithBufferedInput::PutMaybeModifiable. If the queue
size is 0, LastPuts adds a full block with just padding data.
Is this a bug or it's the expected result? We're working in an
environment where data size send accross network is critical.
Thank you very much for your help!
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