Pl_AES_PDF.hh
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#ifndef PL_AES_PDF_HH
#define PL_AES_PDF_HH
#include <qpdf/Pipeline.hh>
#include <qpdf/QPDFCryptoImpl.hh>
#include <memory>
// This pipeline implements AES-128 and AES-256 with CBC and block padding as specified in the PDF
// specification.
class Pl_AES_PDF final: public Pipeline
{
public:
// key should be a pointer to key_bytes bytes of data
Pl_AES_PDF(
char const* identifier,
Pipeline* next,
bool encrypt,
unsigned char const* key,
size_t key_bytes);
~Pl_AES_PDF() final = default;
void write(unsigned char const* data, size_t len) final;
void finish() final;
// Use zero initialization vector; needed for AESV3
void useZeroIV();
// Disable padding; needed for AESV3
void disablePadding();
// Specify an initialization vector, which will not be included in
// the output.
void setIV(unsigned char const* iv, size_t bytes);
// For testing only; PDF always uses CBC
void disableCBC();
// For testing only: use a fixed initialization vector for CBC
static void useStaticIV();
private:
void flush(bool discard_padding);
void initializeVector();
static unsigned int const buf_size = QPDFCryptoImpl::rijndael_buf_size;
static bool use_static_iv;
std::shared_ptr<QPDFCryptoImpl> crypto;
bool encrypt;
bool cbc_mode{true};
bool first{true};
size_t offset{0}; // offset into memory buffer
std::unique_ptr<unsigned char[]> key;
size_t key_bytes{0};
unsigned char inbuf[buf_size];
unsigned char outbuf[buf_size];
unsigned char cbc_block[buf_size];
unsigned char specified_iv[buf_size];
bool use_zero_iv{false};
bool use_specified_iv{false};
bool disable_padding{false};
};
#endif // PL_AES_PDF_HH