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//class for checksum calculation
//author Paul Sundvall 20060201
/*
cvs info:
$Revision: 56 $
$Id: Checksum.hh 56 2006-03-15 19:06:35Z pauls $
Author Paul Sundvall 2006
See LICENSE for details.
*/
class Checksum {
public:
Checksum():m_checksumtype(NOTSET),m_state(0),m_digest(0){};
~Checksum();
//these are the checksums that can be calculated
enum checksumtypes {
NOTSET=0,
MD5,
SHA1,
};
//init the object
int init(int checksumtype);
int update(unsigned int length, unsigned char *buffer);
//prints the checksum on stdout
int print();
//writes the checksum to buffer.
//returns 0 if everything went ok.
int printToBuffer(void *buffer);
//returns the number of bytes that the buffer needs to be
//returns negative if something is wrong.
int getDigestLength() const;
private:
//deletes allocated memory
int release();
//prints the checksum to stdout
void display_hex(unsigned length,void *data_);
//to know what type of checksum we are doing
int m_checksumtype;
//the checksum calculation internal state
void *m_state;
//the result is stored in this variable
void *m_digest;
};
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