SHA256 Class Reference

SHA-256 message digest. More...

#include <sha.h>

Inheritance diagram for SHA256:

Public Member Functions
std::string	AlgorithmProvider () const
Public Member Functions inherited from IteratedHashWithStaticTransform< word32, BigEndian, 64, 32, SHA256, 32, true >
unsigned int	DigestSize () const
	Provides the digest size of the hash.
Public Member Functions inherited from ClonableImpl< DERIVED, BASE >
Clonable *	Clone () const
	Create a copy of this object.

Static Public Member Functions
static void	InitState (HashWordType *state)
	Initialize state array.
static void	Transform (HashWordType *digest, const HashWordType *data)
	Operate the hash.
static const char *	StaticAlgorithmName ()
	The algorithm name.

Additional Inherited Members
Static Public Attributes inherited from IteratedHashWithStaticTransform< word32, BigEndian, 64, 32, SHA256, 32, true >
static const int	DIGESTSIZE

Detailed Description

SHA-256 message digest.

See also

SHA-256

Since

SHA2 since Crypto++ 4.0, ARMv8 SHA since Crypto++ 6.0, Intel SHA since Crypto++ 6.0, Power8 SHA since Crypto++ 6.1

Definition at line 64 of file sha.h.

Member Function Documentation

InitState()

static void SHA256::InitState ( HashWordType * state )

static

Initialize state array.

Parameters

state

the state of the hash

InitState sets a state array to SHA256 initial values

Hashes which derive from IteratedHashWithStaticTransform provide static member functions InitState and Transform. External classes, like SEAL and MDC, can initialize state with a user provided key and operate the hash on the data with the user supplied state.

Note

On Intel platforms the state array must be 16-byte aligned for SSE2.

Transform()

static void SHA256::Transform ( HashWordType * digest, const HashWordType * data )

static

Operate the hash.

Parameters

digest	the state of the hash
data	the data to be digested

Transform operates the hash on data. When the call is invoked digest holds initial state. Upon return digest holds the hash or updated state.

Hashes which derive from IteratedHashWithStaticTransform provide static member functions InitState and Transform. External classes, like SEAL and MDC, can initialize state with a user provided key and operate the hash on the data with the user supplied state.

Note

On Intel platforms the state array and data must be 16-byte aligned for SSE2.

StaticAlgorithmName()

static const char * SHA256::StaticAlgorithmName ( )

inlinestatic

The algorithm name.

Returns

C-style string "SHA-256"

Definition at line 90 of file sha.h.

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

• sha.h