SipHash message authentication code base class. More...

#include <siphash.h>

Inheritance diagram for SipHash_Base< C, D, T_128bit >:

Public Member Functions
virtual unsigned int	DigestSize () const
	Provides the digest size of the hash.

virtual size_t	MinKeyLength () const
	Returns smallest valid key length.

virtual size_t	MaxKeyLength () const
	Returns largest valid key length.

virtual size_t	DefaultKeyLength () const
	Returns default key length.

virtual size_t	GetValidKeyLength (size_t keylength) const
	Returns a valid key length for the algorithm.

virtual IV_Requirement	IVRequirement () const
	Minimal requirement for secure IVs.

virtual unsigned int	IVSize () const
	Returns length of the IV accepted by this object.

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

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

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

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

Public Member Functions inherited from SimpleKeyingInterface
virtual bool	IsValidKeyLength (size_t keylength) const
	Returns whether keylength is a valid key length.

virtual void	SetKey (const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)
	Sets or reset the key of this object.

void	SetKeyWithRounds (const byte *key, size_t length, int rounds)
	Sets or reset the key of this object.

void	SetKeyWithIV (const byte key, size_t length, const byte iv, size_t ivLength)
	Sets or reset the key of this object.

void	SetKeyWithIV (const byte key, size_t length, const byte iv)
	Sets or reset the key of this object.

bool	IsResynchronizable () const
	Determines if the object can be resynchronized.

bool	CanUseRandomIVs () const
	Determines if the object can use random IVs.

bool	CanUsePredictableIVs () const
	Determines if the object can use random but possibly predictable IVs.

bool	CanUseStructuredIVs () const
	Determines if the object can use structured IVs.

unsigned int	DefaultIVLength () const
	Provides the default size of an IV.

virtual unsigned int	MinIVLength () const
	Provides the minimum size of an IV.

virtual unsigned int	MaxIVLength () const
	Provides the maximum size of an IV.

virtual void	Resynchronize (const byte *iv, int ivLength=-1)
	Resynchronize with an IV.

virtual void	GetNextIV (RandomNumberGenerator &rng, byte *iv)
	Retrieves a secure IV for the next 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 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.

Static Public Member Functions
static std::string	StaticAlgorithmName ()

Static Public Member Functions inherited from SipHash_Info< T_128bit >
static const char *	StaticAlgorithmName ()

Static Public Member Functions inherited from FixedKeyLength< 16 >
static size_t	StaticGetValidKeyLength (size_t keylength)
	The default key length for the algorithm provided by a static function.

Additional Inherited Members
Public Types inherited from SimpleKeyingInterface
enum	IV_Requirement { UNIQUE_IV = 0 , RANDOM_IV , UNPREDICTABLE_RANDOM_IV , INTERNALLY_GENERATED_IV , NOT_RESYNCHRONIZABLE }
	Secure IVs requirements as enumerated values. More...

Static Public Attributes inherited from SipHash_Info< T_128bit >
static const int	DIGESTSIZE = (T_128bit ? 16 : 8)

Static Public Attributes inherited from FixedKeyLength< 16 >
static const int	KEYLENGTH
	The default key length used by the algorithm provided as a constant.

static const int	MIN_KEYLENGTH
	The minimum key length used by the algorithm provided as a constant.

static const int	MAX_KEYLENGTH
	The maximum key length used by the algorithm provided as a constant.

static const int	DEFAULT_KEYLENGTH
	The default key length used by the algorithm provided as a constant.

static const int	IV_REQUIREMENT
	The default IV requirements for the algorithm provided as a constant.

static const int	IV_LENGTH
	The default IV length used by the algorithm provided as a constant.

Detailed Description

template<unsigned int C, unsigned int D, bool T_128bit>
class SipHash_Base< C, D, T_128bit >

SipHash message authentication code base class.

Template Parameters

C	the number of compression rounds
D	the number of finalization rounds
T_128bit	flag indicating 128-bit (true) versus 64-bit (false) digest size

Definition at line 51 of file siphash.h.

Constructor & Destructor Documentation

◆ ~SipHash_Base()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual SipHash_Base< C, D, T_128bit >::~SipHash_Base ( )

inlinevirtual

Definition at line 58 of file siphash.h.

◆ SipHash_Base()

template<unsigned int C, unsigned int D, bool T_128bit>

SipHash_Base< C, D, T_128bit >::SipHash_Base ( )

inline

Definition at line 60 of file siphash.h.

Member Function Documentation

◆ StaticAlgorithmName()

template<unsigned int C, unsigned int D, bool T_128bit>

static std::string SipHash_Base< C, D, T_128bit >::StaticAlgorithmName ( )

inlinestatic

Definition at line 54 of file siphash.h.

◆ DigestSize()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual unsigned int SipHash_Base< C, D, T_128bit >::DigestSize ( ) const

inlinevirtual

Provides the digest size of the hash.

Returns: the digest size of the hash.

Implements HashTransformation.

Definition at line 62 of file siphash.h.

◆ MinKeyLength()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual size_t SipHash_Base< C, D, T_128bit >::MinKeyLength ( ) const

inlinevirtual

Returns smallest valid key length.

Returns: the minimum key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 64 of file siphash.h.

◆ MaxKeyLength()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual size_t SipHash_Base< C, D, T_128bit >::MaxKeyLength ( ) const

inlinevirtual

Returns largest valid key length.

Returns: the maximum key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 66 of file siphash.h.

◆ DefaultKeyLength()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual size_t SipHash_Base< C, D, T_128bit >::DefaultKeyLength ( ) const

inlinevirtual

Returns default key length.

Returns: the default key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 68 of file siphash.h.

◆ GetValidKeyLength()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual size_t SipHash_Base< C, D, T_128bit >::GetValidKeyLength ( size_t keylength ) const

inlinevirtual

Returns a valid key length for the algorithm.

Parameters

keylength the size of the key, in bytes

Returns: the valid key length, in bytes

keylength is provided in bytes, not bits. If keylength is less than MIN_KEYLENGTH, then the function returns MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH, then the function returns MAX_KEYLENGTH. if If keylength is a multiple of KEYLENGTH_MULTIPLE, then keylength is returned. Otherwise, the function returns a lower multiple of KEYLENGTH_MULTIPLE.

Implements SimpleKeyingInterface.

Definition at line 70 of file siphash.h.

◆ IVRequirement()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual IV_Requirement SipHash_Base< C, D, T_128bit >::IVRequirement ( ) const

inlinevirtual

Minimal requirement for secure IVs.

Returns: the secure IV requirement of the algorithm

Implements SimpleKeyingInterface.

Definition at line 72 of file siphash.h.

◆ IVSize()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual unsigned int SipHash_Base< C, D, T_128bit >::IVSize ( ) const

inlinevirtual

Returns length of the IV accepted by this object.

Returns: the size of an IV, in bytes

Exceptions

NotImplemented() if the object does not support resynchronization

The default implementation throws NotImplemented

Reimplemented from SimpleKeyingInterface.

Definition at line 74 of file siphash.h.

◆ OptimalBlockSize()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual unsigned int SipHash_Base< C, D, T_128bit >::OptimalBlockSize ( ) const

inlinevirtual

Provides the input block size most efficient for this hash.

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

The base class implementation returns MandatoryBlockSize().

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

Reimplemented from HashTransformation.

Definition at line 76 of file siphash.h.

◆ OptimalDataAlignment()

template<unsigned int C, unsigned int D, bool T_128bit>

virtual unsigned int SipHash_Base< C, D, T_128bit >::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 78 of file siphash.h.

◆ Update()

template<unsigned int C, unsigned int D, bool T_128bit>

void SipHash_Base< C, D, T_128bit >::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 157 of file siphash.h.

◆ TruncatedFinal()

template<unsigned int C, unsigned int D, bool T_128bit>

void SipHash_Base< C, D, T_128bit >::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 206 of file siphash.h.

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

siphash.h

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ~SipHash_Base()

◆ SipHash_Base()

Member Function Documentation

◆ StaticAlgorithmName()

◆ DigestSize()

◆ MinKeyLength()

◆ MaxKeyLength()

◆ DefaultKeyLength()

◆ GetValidKeyLength()

◆ IVRequirement()

◆ IVSize()

◆ OptimalBlockSize()

◆ OptimalDataAlignment()

◆ Update()

◆ TruncatedFinal()