The BLAKE2s cryptographic hash function. More...

#include <blake2.h>

Inheritance diagram for BLAKE2s:

Public Types
typedef BLAKE2s_State	State

typedef BLAKE2s_ParameterBlock	ParameterBlock

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...

Public Member Functions
	BLAKE2s (bool treeMode=false, unsigned int digestSize=DIGESTSIZE)
	Construct a BLAKE2s hash.

	BLAKE2s (unsigned int digestSize)
	Construct a BLAKE2s hash.

	BLAKE2s (const byte key, size_t keyLength, const byte salt=NULL, size_t saltLength=0, const byte *personalization=NULL, size_t personalizationLength=0, bool treeMode=false, unsigned int digestSize=DIGESTSIZE)
	Construct a BLAKE2s hash.

std::string	AlgorithmName () const
	Retrieve the object's name.

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

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	Restart (const BLAKE2s_ParameterBlock &block, const word32 counter[2])
	Restart a hash with parameter block and counter.

void	SetTreeMode (bool mode)
	Set tree mode.

bool	GetTreeMode () const
	Get tree mode.

void	TruncatedFinal (byte *hash, size_t size)
	Computes the hash of the current message.

std::string	AlgorithmProvider () const
	Retrieve the provider of this algorithm.

Public Member Functions inherited from SimpleKeyingInterfaceImpl< MessageAuthenticationCode, BLAKE2s_Info >
size_t	MinKeyLength () const
	The minimum key length used by the algorithm.

size_t	MaxKeyLength () const
	The maximum key length used by the algorithm.

size_t	DefaultKeyLength () const
	The default key length used by the algorithm.

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

SimpleKeyingInterface::IV_Requirement	IVRequirement () const
	The default IV requirements for the algorithm.

unsigned int	IVSize () const
	The initialization vector length for the algorithm.

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	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.

Public Member Functions inherited from Clonable
virtual Clonable *	Clone () const
	Copies this object.

Static Public Member Functions
static const char *	StaticAlgorithmName ()

Static Public Attributes
static const int	DEFAULT_KEYLENGTH = BLAKE2s_Info::DEFAULT_KEYLENGTH

static const int	MIN_KEYLENGTH = BLAKE2s_Info::MIN_KEYLENGTH

static const int	MAX_KEYLENGTH = BLAKE2s_Info::MAX_KEYLENGTH

static const int	DIGESTSIZE = BLAKE2s_Info::DIGESTSIZE

static const int	BLOCKSIZE = BLAKE2s_Info::BLOCKSIZE

static const int	SALTSIZE = BLAKE2s_Info::SALTSIZE

static const int	PERSONALIZATIONSIZE = BLAKE2s_Info::PERSONALIZATIONSIZE

Detailed Description

The BLAKE2s cryptographic hash function.

BLAKE2s can function as both a hash and keyed hash. If you want only the hash, then use the BLAKE2s constructor that accepts no parameters or digest size. If you want a keyed hash, then use the constructor that accpts the key as a parameter. Once a key and digest size are selected, its effectively immutable. The Restart() method that accepts a ParameterBlock does not allow you to change it.

See also: Aumasson, Neves, Wilcox-O'Hearn and Winnerlein's BLAKE2: simpler, smaller, fast as MD5 (2013.01.29).

Since: C++ since Crypto++ 5.6.4, SSE since Crypto++ 5.6.4, NEON since Crypto++ 6.0, Power8 since Crypto++ 8.0

Definition at line 237 of file blake2.h.

Member Typedef Documentation

◆ State

typedef BLAKE2s_State BLAKE2s::State

Definition at line 249 of file blake2.h.

◆ ParameterBlock

typedef BLAKE2s_ParameterBlock BLAKE2s::ParameterBlock

Definition at line 250 of file blake2.h.

Constructor & Destructor Documentation

◆ ~BLAKE2s()

virtual BLAKE2s::~BLAKE2s ( )

inlinevirtual

Definition at line 254 of file blake2.h.

◆ BLAKE2s() [1/3]

BLAKE2s::BLAKE2s	(	bool	treeMode = false,
		unsigned int	digestSize = DIGESTSIZE )

Construct a BLAKE2s hash.

Parameters

digestSize	the digest size, in bytes
treeMode	flag indicating tree mode

Since: Crypto++ 5.6.4

Definition at line 326 of file blake2.cpp.

◆ BLAKE2s() [2/3]

BLAKE2s::BLAKE2s ( unsigned int digestSize )

Construct a BLAKE2s hash.

Parameters

digestSize the digest size, in bytes

treeMode flag is set to false

Since: Crypto++ 8.2

Definition at line 346 of file blake2.cpp.

◆ BLAKE2s() [3/3]

BLAKE2s::BLAKE2s	(	const byte *	key,
		size_t	keyLength,
		const byte *	salt = NULL,
		size_t	saltLength = 0,
		const byte *	personalization = NULL,
		size_t	personalizationLength = 0,
		bool	treeMode = false,
		unsigned int	digestSize = DIGESTSIZE )

Construct a BLAKE2s hash.

Parameters

key	a byte array used to key the cipher
keyLength	the size of the byte array
salt	a byte array used as salt
saltLength	the size of the byte array
personalization	a byte array used as personalization string
personalizationLength	the size of the byte array
treeMode	flag indicating tree mode
digestSize	the digest size, in bytes

Since: Crypto++ 5.6.4

Definition at line 366 of file blake2.cpp.

Member Function Documentation

◆ StaticAlgorithmName()

static const char * BLAKE2s::StaticAlgorithmName ( )

inlinestatic

Definition at line 252 of file blake2.h.

◆ AlgorithmName()

std::string BLAKE2s::AlgorithmName ( ) const

inlinevirtual

Retrieve the object's name.

Returns: the object's algorithm name following RFC 7693

Object algorithm name follows the naming described in RFC 7693, The BLAKE2 Cryptographic Hash and Message Authentication Code (MAC). For example, "BLAKE2b-512" and "BLAKE2s-256".

Reimplemented from Algorithm.

Definition at line 287 of file blake2.h.

◆ BlockSize()

unsigned int BLAKE2s::BlockSize ( ) const

inlinevirtual

Provides the block size of the compression function.

Returns: block size of the compression function, in bytes

BlockSize() will return 0 if the hash is not block based or does not have an equivalent block size. For example, Keccak and SHA-3 do not have a block size, but they do have an equivalent block size called rate expressed as r.

Reimplemented from HashTransformation.

Definition at line 289 of file blake2.h.

◆ DigestSize()

unsigned int BLAKE2s::DigestSize ( ) const

inlinevirtual

Provides the digest size of the hash.

Returns: the digest size of the hash.

Implements HashTransformation.

Definition at line 290 of file blake2.h.

◆ OptimalDataAlignment()

unsigned int BLAKE2s::OptimalDataAlignment ( ) const

virtual

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 232 of file blake2.cpp.

◆ Update()

void BLAKE2s::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 536 of file blake2.cpp.

◆ Restart() [1/2]

void BLAKE2s::Restart ( )

virtual

Restart the hash.

Discards the current state, and restart for a new message

Reimplemented from HashTransformation.

Definition at line 462 of file blake2.cpp.

◆ Restart() [2/2]

void BLAKE2s::Restart	(	const BLAKE2s_ParameterBlock &	block,
		const word32	counter[2] )

Restart a hash with parameter block and counter.

Parameters

block	parameter block
counter	counter array

Parameter block is persisted across calls to Restart().

Definition at line 474 of file blake2.cpp.

◆ SetTreeMode()

void BLAKE2s::SetTreeMode ( bool mode )

inline

Set tree mode.

Parameters

mode	the new tree mode

BLAKE2 has two finalization flags, called State::f[0] and State::f[1]. If treeMode=false (default), then State::f[1] is never set. If treeMode=true, then State::f[1] is set when State::f[0] is set. Tree mode is persisted across calls to Restart().

Definition at line 308 of file blake2.h.

◆ GetTreeMode()

bool BLAKE2s::GetTreeMode ( ) const

inline

Get tree mode.

Returns: the current tree mode

Tree mode is persisted across calls to Restart().

Definition at line 313 of file blake2.h.

◆ TruncatedFinal()

void BLAKE2s::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 611 of file blake2.cpp.

◆ AlgorithmProvider()

std::string BLAKE2s::AlgorithmProvider ( ) const

virtual

Retrieve the provider of this algorithm.

Returns: the algorithm provider

The algorithm provider can be a name like "C++", "SSE", "NEON", "AESNI", "ARMv8" and "Power8". C++ is standard C++ code. Other labels, like SSE, usually indicate a specialized implementation using instructions from a higher instruction set architecture (ISA). Future labels may include external hardware like a hardware security module (HSM).

Generally speaking Wei Dai's original IA-32 ASM code falls under "SSE2". Labels like "SSSE3" and "SSE4.1" follow after Wei's code and use intrinsics instead of ASM.

Algorithms which combine different instructions or ISAs provide the dominant one. For example on x86 AES/GCM returns "AESNI" rather than "CLMUL" or "AES+SSE4.1" or "AES+CLMUL" or "AES+SSE4.1+CLMUL".

Note: Provider is not universally implemented yet.

Since: Crypto++ 8.0

Reimplemented from Algorithm.

Definition at line 252 of file blake2.cpp.

Member Data Documentation

◆ DEFAULT_KEYLENGTH

const int BLAKE2s::DEFAULT_KEYLENGTH = BLAKE2s_Info::DEFAULT_KEYLENGTH

static

Definition at line 240 of file blake2.h.

◆ MIN_KEYLENGTH

const int BLAKE2s::MIN_KEYLENGTH = BLAKE2s_Info::MIN_KEYLENGTH

static

Definition at line 241 of file blake2.h.

◆ MAX_KEYLENGTH

const int BLAKE2s::MAX_KEYLENGTH = BLAKE2s_Info::MAX_KEYLENGTH

static

Definition at line 242 of file blake2.h.

◆ DIGESTSIZE

const int BLAKE2s::DIGESTSIZE = BLAKE2s_Info::DIGESTSIZE

static

Definition at line 244 of file blake2.h.

◆ BLOCKSIZE

const int BLAKE2s::BLOCKSIZE = BLAKE2s_Info::BLOCKSIZE

static

Definition at line 245 of file blake2.h.

◆ SALTSIZE

const int BLAKE2s::SALTSIZE = BLAKE2s_Info::SALTSIZE

static

Definition at line 246 of file blake2.h.

◆ PERSONALIZATIONSIZE

const int BLAKE2s::PERSONALIZATIONSIZE = BLAKE2s_Info::PERSONALIZATIONSIZE

static

Definition at line 247 of file blake2.h.

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

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Detailed Description

Member Typedef Documentation

◆ State

◆ ParameterBlock

Constructor & Destructor Documentation

◆ ~BLAKE2s()

◆ BLAKE2s() [1/3]

◆ BLAKE2s() [2/3]

◆ BLAKE2s() [3/3]

Member Function Documentation

◆ StaticAlgorithmName()

◆ AlgorithmName()

◆ BlockSize()

◆ DigestSize()

◆ OptimalDataAlignment()

◆ Update()

◆ Restart() [1/2]

◆ Restart() [2/2]

◆ SetTreeMode()

◆ GetTreeMode()

◆ TruncatedFinal()

◆ AlgorithmProvider()

Member Data Documentation

◆ DEFAULT_KEYLENGTH

◆ MIN_KEYLENGTH

◆ MAX_KEYLENGTH

◆ DIGESTSIZE

◆ BLOCKSIZE

◆ SALTSIZE

◆ PERSONALIZATIONSIZE