Iterated hash base class. More...

#include <iterhash.h>

Inheritance diagram for IteratedHashBase< T, BASE >:

Collaboration diagram for IteratedHashBase< T, BASE >:

Public Types
typedef T	HashWordType

Public Member Functions
	IteratedHashBase ()
	Construct an IteratedHashBase. More...

unsigned int	OptimalBlockSize () const
	Provides the input block size most efficient for this cipher. More...

unsigned int	OptimalDataAlignment () const
	Provides input and output data alignment for optimal performance. More...

void	Update (const byte *input, size_t length)
	Updates a hash with additional input. More...

byte *	CreateUpdateSpace (size_t &size)
	Requests space which can be written into by the caller. More...

void	Restart ()
	Restart the hash. More...

void	TruncatedFinal (byte *digest, size_t digestSize)
	Computes the hash of the current message. More...

Protected Member Functions
T	GetBitCountHi () const

T	GetBitCountLo () const

void	PadLastBlock (unsigned int lastBlockSize, byte padFirst=0x80)

virtual void	Init ()=0

virtual ByteOrder	GetByteOrder () const =0

virtual void	HashEndianCorrectedBlock (const HashWordType *data)=0

virtual size_t	HashMultipleBlocks (const T *input, size_t length)

void	HashBlock (const HashWordType *input)

virtual T *	DataBuf ()=0

virtual T *	StateBuf ()=0

Private Attributes
T	m_countLo

T	m_countHi

Detailed Description

template<class T, class BASE>
class IteratedHashBase< T, BASE >

Iterated hash base class.

Template Parameters

T	Hash word type
BASE	HashTransformation derived class

IteratedHashBase provides an interface for block-based iterated hashes

See also: HashTransformation, MessageAuthenticationCode

Definition at line 27 of file iterhash.h.

Member Typedef Documentation

template<class T, class BASE>

typedef T IteratedHashBase< T, BASE >::HashWordType

Definition at line 30 of file iterhash.h.

Constructor & Destructor Documentation

template<class T, class BASE>

IteratedHashBase< T, BASE >::IteratedHashBase ( )

inline

Construct an IteratedHashBase.

Definition at line 33 of file iterhash.h.

Member Function Documentation

template<class T , class BASE >

byte * IteratedHashBase< T, BASE >::CreateUpdateSpace ( size_t & size )

Requests space which can be written into by the caller.

Parameters

size	the requested size of the buffer

The purpose of this method is to help avoid extra memory allocations.

size is an IN and OUT parameter and used as a hint. When the call is made, size is the requested size of the buffer. When the call returns, size is the size of the array returned to the caller.

The base class implementation sets size to 0 and returns NULL.

Note: Some objects, like ArraySink, cannot create a space because its fixed.

Definition at line 75 of file iterhash.cpp.

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template<class T, class BASE>

virtual T* IteratedHashBase< T, BASE >::DataBuf ( )

protectedpure virtual

Implemented in IteratedHash< T_HashWordType, T_Endianness, T_BlockSize, T_Base >, IteratedHash< word64, LittleEndian, T_BlockSize >, IteratedHash< T_HashWordType, T_Endianness, T_BlockSize >, IteratedHash< word32, LittleEndian, T_BlockSize >, IteratedHash< word32, LittleEndian, 64, MessageAuthenticationCode >, IteratedHash< word32, BigEndian, T_BlockSize >, IteratedHash< word32, NativeByteOrder, 32 >, IteratedHash< word64, BigEndian, T_BlockSize >, and VMAC_Base.

template<class T, class BASE>

T IteratedHashBase< T, BASE >::GetBitCountHi ( ) const

inlineprotected

Definition at line 74 of file iterhash.h.

template<class T, class BASE>

T IteratedHashBase< T, BASE >::GetBitCountLo ( ) const

inlineprotected

Definition at line 75 of file iterhash.h.

template<class T, class BASE>

virtual ByteOrder IteratedHashBase< T, BASE >::GetByteOrder ( ) const

protectedpure virtual

Implemented in IteratedHash< T_HashWordType, T_Endianness, T_BlockSize, T_Base >, IteratedHash< word64, LittleEndian, T_BlockSize >, IteratedHash< T_HashWordType, T_Endianness, T_BlockSize >, IteratedHash< word32, LittleEndian, T_BlockSize >, IteratedHash< word32, LittleEndian, 64, MessageAuthenticationCode >, IteratedHash< word32, BigEndian, T_BlockSize >, IteratedHash< word32, NativeByteOrder, 32 >, IteratedHash< word64, BigEndian, T_BlockSize >, and VMAC_Base.

template<class T, class BASE>

void IteratedHashBase< T, BASE >::HashBlock ( const HashWordType * input )

inlineprotected

Definition at line 83 of file iterhash.h.

template<class T, class BASE>

virtual void IteratedHashBase< T, BASE >::HashEndianCorrectedBlock ( const HashWordType * data )

protectedpure virtual

template<class T, class BASE >

size_t IteratedHashBase< T, BASE >::HashMultipleBlocks	(	const T *	input,
		size_t	length
	)

protectedvirtual

Reimplemented in Weak::PanamaHash< B >, and VMAC_Base.

Definition at line 83 of file iterhash.cpp.

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template<class T, class BASE>

virtual void IteratedHashBase< T, BASE >::Init ( )

protectedpure virtual

template<class T, class BASE>

unsigned int IteratedHashBase< T, BASE >::OptimalBlockSize ( ) const

inline

Provides the input block size most efficient for this cipher.

Returns: The input block size that is most efficient for the cipher

The base class implementation returns MandatoryBlockSize().

Note: Optimal input length is n * OptimalBlockSize() - GetOptimalBlockSizeUsed() for any n > 0.

Definition at line 40 of file iterhash.h.

template<class T, class BASE>

unsigned int IteratedHashBase< T, BASE >::OptimalDataAlignment ( ) const

inline

Provides input and output data alignment for optimal performance.

Returns: the input data alignment that provides optimal performance

OptimalDataAlignment returns the natural alignment of the hash word.

Definition at line 45 of file iterhash.h.

template<class T , class BASE >

void IteratedHashBase< T, BASE >::PadLastBlock	(	unsigned int	lastBlockSize,
		byte	padFirst = `0x80`
	)

protected

Definition at line 108 of file iterhash.cpp.

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template<class T , class BASE >

void IteratedHashBase< T, BASE >::Restart ( )

Restart the hash.

Discards the current state, and restart for a new message

Definition at line 125 of file iterhash.cpp.

template<class T, class BASE>

virtual T* IteratedHashBase< T, BASE >::StateBuf ( )

protectedpure virtual

template<class T , class BASE >

void IteratedHashBase< T, BASE >::TruncatedFinal	(	byte *	digest,
		size_t	digestSize
	)

Computes the hash of the current message.

Parameters

digest	a pointer to the buffer to receive the hash
digestSize	the size of the truncated digest, in bytes

TruncatedFinal() call Final() and then copies digestSize bytes to digest. The hash is restarted the hash for the next message.

Definition at line 131 of file iterhash.cpp.

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template<class T , class BASE >

void IteratedHashBase< T, BASE >::Update	(	const byte *	input,
		size_t	length
	)

Updates a hash with additional input.

Parameters

input	the additional input as a buffer
length	the size of the buffer, in bytes

Definition at line 12 of file iterhash.cpp.

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Member Data Documentation

template<class T, class BASE>

T IteratedHashBase< T, BASE >::m_countHi

private

Definition at line 89 of file iterhash.h.

template<class T, class BASE>

T IteratedHashBase< T, BASE >::m_countLo

private

Definition at line 89 of file iterhash.h.

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

src/cryptopp/iterhash.h
src/cryptopp/iterhash.cpp

Public Types

Public Member Functions

Protected Member Functions

Private Attributes

Detailed Description

template<class T, class BASE> class IteratedHashBase< T, BASE >

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

template<class T, class BASE>
class IteratedHashBase< T, BASE >