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#ifndef BU_CIPHER_H
#define BU_CIPHER_H
#include "bu/filter.h"
namespace Bu
{
template<int iBlockSize>
class Cipher : Bu::Filter
{
public:
Cipher( Bu::Stream &rNext ) :
Bu::Filter( rNext )
{
}
virtual ~Cipher()
{
}
virtual void start()
{
}
virtual Bu::size stop()
{
return 0;
}
virtual Bu::size read( void *pBuf, Bu::size iBytes )
{
uint32_t i;
if (iBytes%iBlockSize)
{
return 0;
}
iBytes /= iBlockSize;
for (i=0;i<iBytes;i++)
{
void *pSeg = ((char *)pBuf)+(i*iBlockSize);
int iRead = rNext.read( pSeg, iBlockSize );
decipher( pSeg );
}
return iBytes*iBlockSize;
}
virtual Bu::size write( const void *pBuf, Bu::size iBytes )
{
uint32_t i;
if (iBytes%iBlockSize)
{
return 0;
}
iBytes /= iBlockSize;
char buf[iBlockSize];
for (i=0;i<iBytes;i++)
{
memcpy( buf, ((const char *)pBuf)+(i*iBlockSize), 8 );
encipher( buf );
rNext.write( buf, iBlockSize );
}
memset( &buf, 0, iBlockSize );
return iBytes*iBlockSize;
}
using Bu::Stream::read;
using Bu::Stream::write;
protected:
virtual void encipher( void *pData )=0;
virtual void decipher( void *pData )=0;
};
};
#endif
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