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#ifndef __PL_AES_PDF_HH__
#define __PL_AES_PDF_HH__
#include <qpdf/Pipeline.hh>
#include <qpdf/qpdf-config.h>
// This pipeline implements AES-128 with CBC and block padding as
// specified in the PDF specification.
class Pl_AES_PDF: public Pipeline
{
public:
// key_data should be a pointer to key_size bytes of data
static unsigned int const key_size = 16;
QPDF_DLL
Pl_AES_PDF(char const* identifier, Pipeline* next,
bool encrypt, unsigned char const key[key_size]);
QPDF_DLL
virtual ~Pl_AES_PDF();
QPDF_DLL
virtual void write(unsigned char* data, int len);
QPDF_DLL
virtual void finish();
// For testing only; PDF always uses CBC
QPDF_DLL
void disableCBC();
// For testing only: use a fixed initialization vector for CBC
QPDF_DLL
static void useStaticIV();
private:
void flush(bool discard_padding);
void initializeVector();
static unsigned int const buf_size = 16;
static bool use_static_iv;
bool encrypt;
bool cbc_mode;
bool first;
unsigned int offset;
unsigned char key[key_size];
uint32_t rk[key_size + 28];
unsigned char inbuf[buf_size];
unsigned char outbuf[buf_size];
unsigned char cbc_block[buf_size];
unsigned int nrounds;
};
#endif // __PL_AES_PDF_HH__
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