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HashModule Class Reference

abstract base class for hash functions. More...

#include <cryptlib.h>

Inheritance diagram for HashModule:

List of all members.

Public Methods
virtual	~HashModule ()
virtual void	Update (const byte *input,unsigned int length)=0
	process more input.
virtual void	Final (byte *digest)=0
virtual unsigned int	DigestSize ()const=0
	size of the hash returned by Final().
virtual void	CalculateDigest (byte *digest,const byte *input,int length)
	use this if your input is short and you don't want to call Update() and Final() seperately. More...
virtual bool	Verify (const byte *digest)
	verify that digest is a valid digest for the current message, then reinitialize the object. More...
virtual bool	VerifyDigest (const byte *digest,const byte *input,int length)
	use this if your input is short and you don't want to call Update() and Verify() seperately. More...

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Detailed Description

abstract base class for hash functions.

HashModule objects are stateful. They are created in an initial state, change state as Update() is called, and return to the initial state when Final() is called. This interface allows a large message to be hashed in pieces by calling Update() on each piece followed by calling Final().

Definition at line 203 of file cryptlib.h.

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Constructor & Destructor Documentation

HashModule::~HashModule ( ) [inline, virtual]

Definition at line 207 of file cryptlib.h.

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Member Function Documentation

void HashModule::CalculateDigest ( byte * digest, const byte * input, int length ) [inline, virtual]

use this if your input is short and you don't want to call Update() and Final() seperately. Definition at line 221 of file cryptlib.h.

bool HashModule::Verify ( const byte * mac ) [virtual]

verify that digest is a valid digest for the current message, then reinitialize the object. Default implementation is to call Final() and do a bitwise comparison between its output and digest. Reimplemented in PSSR, SignatureEncodingMethodWithRecovery, and XMACC. Definition at line 57 of file cryptlib.cpp. Referenced by VerifyDigest().

bool HashModule::VerifyDigest ( const byte * digest, const byte * input, int length ) [inline, virtual]

use this if your input is short and you don't want to call Update() and Verify() seperately. Definition at line 230 of file cryptlib.h.

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The documentation for this class was generated from the following files:

• cryptlib.h
• cryptlib.cpp

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