SHAKE Class Reference

SHAKE message digest base class. More...

#include <shake.h>

Inheritance diagram for SHAKE:

Public Member Functions
unsigned int	DigestSize () const
	Provides the digest size of the hash.
unsigned int	OptimalDataAlignment () const
	Provides input and output data alignment for optimal performance.
void	Update (const byte *input, size_t length)
	Updates a hash with additional input.
void	Restart ()
	Restart the hash.
void	TruncatedFinal (byte *hash, size_t size)
	Computes the hash of the current message.
Public Member Functions inherited from HashTransformation
HashTransformation &	Ref ()
	Provides a reference to this object.
virtual byte *	CreateUpdateSpace (size_t &size)
	Request space which can be written into by the caller.
virtual void	Final (byte *digest)
	Computes the hash of the current message.
unsigned int	TagSize () const
	Provides the tag size of the hash.
virtual unsigned int	BlockSize () const
	Provides the block size of the compression function.
virtual unsigned int	OptimalBlockSize () const
	Provides the input block size most efficient for this hash.
virtual void	CalculateDigest (byte *digest, const byte *input, size_t length)
	Updates the hash with additional input and computes the hash of the current message.
virtual bool	Verify (const byte *digest)
	Verifies the hash of the current message.
virtual bool	VerifyDigest (const byte *digest, const byte *input, size_t length)
	Updates the hash with additional input and verifies the hash of the current message.
virtual void	CalculateTruncatedDigest (byte *digest, size_t digestSize, const byte *input, size_t length)
	Updates the hash with additional input and computes the hash of the current message.
virtual bool	TruncatedVerify (const byte *digest, size_t digestLength)
	Verifies the hash of the current message.
virtual bool	VerifyTruncatedDigest (const byte *digest, size_t digestLength, const byte *input, size_t length)
	Updates the hash with additional input and verifies the hash of the current message.
Public Member Functions inherited from Algorithm
	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms.
virtual std::string	AlgorithmName () const
	Provides the name of this algorithm.
virtual std::string	AlgorithmProvider () const
	Retrieve the provider of this algorithm.
Public Member Functions inherited from Clonable
virtual Clonable *	Clone () const
	Copies this object.

Detailed Description

SHAKE message digest base class.

SHAKE is the base class for SHAKE128 and SHAKE258. Library users should instantiate a derived class, and only use SHAKE as a base class reference or pointer.

See also

Keccak, SHA3, SHAKE128, SHAKE256, FIPS 202, SHA-3 Standard: Permutation-Based Hash and Extendable-Output Functions

Since

Crypto++ 8.1

Definition at line 29 of file shake.h.

Member Function Documentation

DigestSize()

unsigned int SHAKE::DigestSize ( ) const

inlinevirtual

Provides the digest size of the hash.

Returns

the digest size of the hash.

Implements HashTransformation.

Definition at line 43 of file shake.h.

OptimalDataAlignment()

unsigned int SHAKE::OptimalDataAlignment ( ) const

inlinevirtual

Provides input and output data alignment for optimal performance.

Returns

the input data alignment that provides optimal performance

See also

GetAlignment() and OptimalBlockSize()

Reimplemented from HashTransformation.

Definition at line 44 of file shake.h.

Update()

void SHAKE::Update ( const byte * input, size_t length )

virtual

Updates a hash with additional input.

Parameters

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

Implements HashTransformation.

Definition at line 28 of file shake.cpp.

Restart()

void SHAKE::Restart ( )

virtual

Restart the hash.

Discards the current state, and restart for a new message

Reimplemented from HashTransformation.

Definition at line 49 of file shake.cpp.

TruncatedFinal()

void SHAKE::TruncatedFinal ( byte * digest, size_t digestSize )

virtual

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

Precondition

COUNTOF(digest) <= DigestSize() or COUNTOF(digest) <= HASH::DIGESTSIZE ensures the output byte buffer is a valid size.

Implements HashTransformation.

Definition at line 62 of file shake.cpp.

---

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

• shake.h
• shake.cpp