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NAME

       ost::Digest - The digest base class is used for implementing and deriving one way hashing
       functions.

SYNOPSIS

       #include <digest.h>

       Inherits streambuf, and ostream.

       Inherited by ost::ChecksumDigest, ost::CRC16Digest, ost::CRC32Digest, and ost::MD5Digest.

   Public Member Functions
       virtual void initDigest (void)=0
           Reset the digest table to an initial default value.
       virtual ~Digest ()

   Protected Member Functions
       Digest ()
       virtual unsigned getSize (void)=0
           Get the size of a digest in octets.
       virtual unsigned getDigest (unsigned char *buffer)=0
           Copy the binary digest buffer to user memory.
       virtual void putDigest (const unsigned char *buffer, unsigned length)=0
           Put data into the digest bypassing the stream subsystem.
       virtual std::ostream & strDigest (std::ostream &os)=0
           print a digest string for export.

   Friends
       std::ostream & operator<< (std::ostream &os, Digest &ia)

Detailed Description

       The digest base class is used for implementing and deriving one way hashing functions.

       Author
           David Sugar dyfet@ostel.com

       base class for hashing services.

Constructor & Destructor Documentation

   ost::Digest::Digest () [protected]
   virtual ost::Digest::~Digest () [virtual]

Member Function Documentation

   virtual unsigned ost::Digest::getDigest (unsigned char * buffer) [protected],  [pure virtual]
       Copy the binary digest buffer to user memory.

       Returns
           number of bytes in digest.

       Parameters
           buffer to write into.

       Implemented in ost::MD5Digest, ost::CRC32Digest, ost::CRC16Digest, and
       ost::ChecksumDigest.

   virtual unsigned ost::Digest::getSize (void) [protected],  [pure virtual]
       Get the size of a digest in octets.

       Returns
           number of bytes in digest.

       Implemented in ost::MD5Digest, ost::CRC32Digest, ost::CRC16Digest, and
       ost::ChecksumDigest.

   virtual void ost::Digest::initDigest (void) [pure virtual]
       Reset the digest table to an initial default value.

       Implemented in ost::MD5Digest, ost::CRC32Digest, ost::CRC16Digest, and
       ost::ChecksumDigest.

   virtual void ost::Digest::putDigest (const unsigned char * buffer, unsigned length)
       [protected],  [pure virtual]
       Put data into the digest bypassing the stream subsystem.

       Parameters
           buffer to read from.
           length of data.

       Implemented in ost::CRC32Digest, ost::CRC16Digest, ost::ChecksumDigest, and
       ost::MD5Digest.

   virtual std::ostream& ost::Digest::strDigest (std::ostream & os) [protected],  [pure virtual]
       print a digest string for export.

       Returns
           string representation of digest.

       Implemented in ost::MD5Digest, ost::CRC32Digest, ost::CRC16Digest, and
       ost::ChecksumDigest.

Friends And Related Function Documentation

   std::ostream& operator<< (std::ostream & os, Digest & ia) [friend]

Author

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