SipHash message authentication code base class. More...

#include <siphash.h>

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

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

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

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

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

virtual size_t	DefaultKeyLength () const
	Returns default key length. More...

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

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

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

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

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

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

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

Public Member Functions inherited from SimpleKeyingInterface
virtual	~SimpleKeyingInterface ()

virtual bool	IsValidKeyLength (size_t keylength) const
	Returns whether keylength is a valid key length. More...

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

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

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

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

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

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

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

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

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

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

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

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

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

Public Member Functions inherited from HashTransformation
virtual	~HashTransformation ()

HashTransformation &	Ref ()
	Provides a reference to this object. More...

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

virtual void	Final (byte *digest)
	Computes the hash of the current message. More...

unsigned int	TagSize () const
	Provides the tag size of the hash. More...

virtual unsigned int	BlockSize () const
	Provides the block size of the compression function. More...

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. More...

virtual bool	Verify (const byte *digest)
	Verifies the hash of the current message. More...

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. More...

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. More...

virtual bool	TruncatedVerify (const byte *digest, size_t digestLength)
	Verifies the hash of the current message. More...

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. More...

Public Member Functions inherited from Algorithm
virtual	~Algorithm ()

	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms. More...

virtual std::string	AlgorithmName () const
	Provides the name of this algorithm. More...

Public Member Functions inherited from Clonable
virtual	~Clonable ()

virtual Clonable *	Clone () const
	Copies this object. More...

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

Public Member Functions inherited from FixedKeyLength< 16 >
CRYPTOPP_STATIC_CONSTEXPR size_t CRYPTOPP_API	StaticGetValidKeyLength (size_t keylength)
	The default key length used by the algorithm provided as a constant. More...

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

Protected Member Functions
virtual void	UncheckedSetKey (const byte *key, unsigned int length, const NameValuePairs &params)
	Sets the key for this object without performing parameter validation. More...

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

void	SIPROUND ()

Protected Member Functions inherited from MessageAuthenticationCode
const Algorithm &	GetAlgorithm () const
	Returns the base class Algorithm. More...

Protected Member Functions inherited from SimpleKeyingInterface
void	ThrowIfInvalidKeyLength (size_t length)
	Validates the key length. More...

void	ThrowIfResynchronizable ()
	Validates the object. More...

void	ThrowIfInvalidIV (const byte *iv)
	Validates the IV. More...

size_t	ThrowIfInvalidIVLength (int length)
	Validates the IV length. More...

const byte *	GetIVAndThrowIfInvalid (const NameValuePairs &params, size_t &size)
	Retrieves and validates the IV. More...

void	AssertValidKeyLength (size_t length) const
	Validates the key length. More...

Protected Member Functions inherited from HashTransformation
void	ThrowIfInvalidTruncatedSize (size_t size) const
	Validates a truncated digest size. More...

Private Attributes
FixedSizeSecBlock< word64, 4 >	m_v

FixedSizeSecBlock< word64, 2 >	m_k

FixedSizeSecBlock< word64, 2 >	m_b

FixedSizeSecBlock< byte, 8 >	m_acc

size_t	m_idx

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...

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 53 of file siphash.h.

Member Function Documentation

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 (recommended) key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 66 of file siphash.h.

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 60 of file siphash.h.

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 68 of file siphash.h.

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 70 of file siphash.h.

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 72 of file siphash.h.

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 64 of file siphash.h.

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 62 of file siphash.h.

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 74 of file siphash.h.

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

Reimplemented from HashTransformation.

Definition at line 76 of file siphash.h.

Here is the call graph for this function:

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

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

protectedvirtual

Restart the hash.

Discards the current state, and restart for a new message

Reimplemented from HashTransformation.

Definition at line 283 of file siphash.h.

Here is the caller graph for this function:

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

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

inlineprotected

Definition at line 87 of file siphash.h.

Here is the call graph for this function:

Here is the caller graph for this function:

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

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

inlinestatic

Definition at line 56 of file siphash.h.

Here is the call graph for this function:

Here is the caller graph for this function:

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

Implements HashTransformation.

Definition at line 204 of file siphash.h.

Here is the call graph for this function:

Here is the caller graph for this function:

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

void SipHash_Base< C, D, T_128bit >::UncheckedSetKey	(	const byte *	key,
		unsigned int	length,
		const NameValuePairs &	params
	)

protectedvirtual

Sets the key for this object without performing parameter validation.

Parameters

key	a byte buffer used to key the cipher
length	the length of the byte buffer
params	additional parameters passed as NameValuePairs

key must be at least DEFAULT_KEYLENGTH in length.

Implements SimpleKeyingInterface.

Definition at line 266 of file siphash.h.

Here is the call graph for this function:

Here is the caller graph for this function:

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 155 of file siphash.h.

Here is the call graph for this function:

Here is the caller graph for this function:

Member Data Documentation

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

FixedSizeSecBlock<byte, 8> SipHash_Base< C, D, T_128bit >::m_acc

private

Definition at line 111 of file siphash.h.

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

FixedSizeSecBlock<word64, 2> SipHash_Base< C, D, T_128bit >::m_b

private

Definition at line 108 of file siphash.h.

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

size_t SipHash_Base< C, D, T_128bit >::m_idx

private

Definition at line 112 of file siphash.h.

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

FixedSizeSecBlock<word64, 2> SipHash_Base< C, D, T_128bit >::m_k

private

Definition at line 107 of file siphash.h.

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

FixedSizeSecBlock<word64, 4> SipHash_Base< C, D, T_128bit >::m_v

private

Definition at line 106 of file siphash.h.

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

src/cryptopp/siphash.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

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

Member Function Documentation

Member Data Documentation

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