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#ifndef __PL_SHA2_HH__
#define __PL_SHA2_HH__
// Bits must be a supported number of bits, currently only 256, 384,
// or 512. Passing 0 as bits leaves the pipeline uncommitted, in
// which case resetBits must be called before the pipeline is used.
// If a next is provided, this pipeline sends its output to its
// successor unmodified. After calling finish, the SHA2 checksum of
// the data that passed through the pipeline is available.
// This pipeline is reusable; i.e., it is safe to call write() after
// calling finish(). The first call to write() after a call to
// finish() initializes a new SHA2 object. resetBits may also be
// called between finish and the next call to write.
#include <qpdf/Pipeline.hh>
#include <sph/sph_sha2.h>
class Pl_SHA2: public Pipeline
{
public:
QPDF_DLL
Pl_SHA2(int bits = 0, Pipeline* next = 0);
QPDF_DLL
virtual ~Pl_SHA2();
QPDF_DLL
virtual void write(unsigned char*, size_t);
QPDF_DLL
virtual void finish();
QPDF_DLL
void resetBits(int bits);
QPDF_DLL
std::string getHexDigest();
QPDF_DLL
std::string getRawDigest();
private:
void badBits();
bool in_progress;
int bits;
sph_sha256_context ctx256;
sph_sha384_context ctx384;
sph_sha512_context ctx512;
unsigned char sha256sum[32];
unsigned char sha384sum[48];
unsigned char sha512sum[64];
};
#endif // __PL_SHA2_HH__
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