SipHash message authentication code. More...

#include <siphash.h>

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

Public Member Functions
	SipHash ()
	Create a SipHash.

	SipHash (const byte *key, unsigned int length)
	Create a SipHash.

Public Member Functions inherited from SipHash_Base< C, D, T_128bit >
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.

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 Member Functions inherited from SipHash_Base< C, D, T_128bit >
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.

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 = 2, unsigned int D = 4, bool T_128bit = false>
class SipHash< C, D, T_128bit >

SipHash message authentication code.

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

SipHash computes a 64-bit or 128-bit message authentication code from a variable-length message and 128-bit secret key. It was designed to be efficient even for short inputs, with performance comparable to non-cryptographic hash functions.

To create a SipHash-2-4 object with a 64-bit MAC use code similar to the following.

  SecByteBlock key(16);
  prng.GenerateBlock(key, key.size());

  SipHash<2,4,false> hash(key, key.size());
  hash.Update(...);
  hash.Final(...);

To create a SipHash-2-4 object with a 128-bit MAC use code similar to the following.

  SecByteBlock key(16);
  prng.GenerateBlock(key, key.size());

  SipHash<2,4,true> hash(key, key.size());
  hash.Update(...);
  hash.Final(...);

See also: Jean-Philippe Aumasson and Daniel J. Bernstein SipHash: a fast short-input PRF

Since: Crypto++ 6.0

Definition at line 142 of file siphash.h.

Constructor & Destructor Documentation

◆ SipHash() [1/2]

template<unsigned int C = 2, unsigned int D = 4, bool T_128bit = false>

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

inline

Create a SipHash.

Definition at line 146 of file siphash.h.

◆ SipHash() [2/2]

template<unsigned int C = 2, unsigned int D = 4, bool T_128bit = false>

SipHash< C, D, T_128bit >::SipHash	(	const byte *	key,
		unsigned int	length )

inline

Create a SipHash.

Parameters

key	a byte array used to key the cipher
length	the size of the byte array, in bytes

Definition at line 151 of file siphash.h.

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

siphash.h

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ SipHash() [1/2]

◆ SipHash() [2/2]