MD5.hh
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#ifndef MD5_HH
#define MD5_HH
#include <qpdf/QPDFCryptoImpl.hh>
#include <qpdf/Types.h>
#include <memory>
#include <string>
class MD5
{
public:
typedef unsigned char Digest[16];
MD5();
void reset();
// encodes string and finalizes
void encodeString(char const* input_string);
// encodes file and finalizes; offset < 0 reads whole file
void encodeFile(char const* filename, qpdf_offset_t up_to_offset = -1);
// appends string to current md5 object
void appendString(char const* input_string);
// appends arbitrary data to current md5 object
void
encodeDataIncrementally(char const* input_data, size_t len)
{
crypto->MD5_update(reinterpret_cast<unsigned char*>(const_cast<char*>(input_data)), len);
}
// appends arbitrary data to current md5 object
void
encodeDataIncrementally(std::string_view input_data)
{
crypto->MD5_update(
reinterpret_cast<unsigned char*>(const_cast<char*>(input_data.data())),
input_data.size());
}
// computes a raw digest
void digest(Digest);
std::string digest();
static std::string digest(std::string_view data);
// prints the digest to stdout terminated with \r\n (primarily for testing)
void print();
// returns the digest as a hexadecimal string
std::string unparse();
// Convenience functions
static std::string getDataChecksum(char const* buf, size_t len);
static std::string getFileChecksum(char const* filename, qpdf_offset_t up_to_offset = -1);
static bool checkDataChecksum(char const* const checksum, char const* buf, size_t len);
static bool checkFileChecksum(
char const* const checksum, char const* filename, qpdf_offset_t up_to_offset = -1);
private:
void init();
void finalize();
std::shared_ptr<QPDFCryptoImpl> crypto;
};
#endif // MD5_HH