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CRC32C Class Reference

CRC-32C Checksum Calculation. More...

#include <crc.h>

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Public Member Functions

 CRC32C ()
 
void Update (const byte *input, size_t length)
 Updates a hash with additional input. More...
 
void TruncatedFinal (byte *hash, size_t size)
 Computes the hash of the current message. More...
 
unsigned int DigestSize () const
 Provides the digest size of the hash. More...
 
CRYPTOPP_STATIC_CONSTEXPR const char * StaticAlgorithmName ()
 
std::string AlgorithmName () const
 Provides the name of this algorithm. More...
 
void UpdateByte (byte b)
 
byte GetCrcByte (size_t i) const
 
- Public Member Functions inherited from HashTransformation
virtual ~HashTransformation ()
 
HashTransformationRef ()
 Provides a reference to this object. More...
 
virtual byteCreateUpdateSpace (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...
 
virtual void Restart ()
 Restart the hash. 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 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 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...
 
- Public Member Functions inherited from Clonable
virtual ~Clonable ()
 
virtual ClonableClone () const
 Copies this object. More...
 

Protected Member Functions

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

Private Attributes

word32 m_crc
 

Static Private Attributes

static const word32 m_tab [256]
 

Detailed Description

CRC-32C Checksum Calculation.

Uses CRC polynomial 0x82F63B78

Since
Crypto++ 5.6.4

Definition at line 51 of file crc.h.

Constructor & Destructor Documentation

CRC32C::CRC32C ( )

Definition at line 295 of file crc.cpp.

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Member Function Documentation

std::string CRC32C::AlgorithmName ( ) const
inlinevirtual

Provides the name of this algorithm.

Returns
the standard algorithm name

The standard algorithm name can be a name like AES or AES/GCM. Some algorithms do not have standard names yet. For example, there is no standard algorithm name for Shoup's ECIES.

Note
AlgorithmName is not universally implemented yet

Reimplemented from Algorithm.

Definition at line 60 of file crc.h.

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unsigned int CRC32C::DigestSize ( ) const
inlinevirtual

Provides the digest size of the hash.

Returns
the digest size of the hash.

Implements HashTransformation.

Definition at line 58 of file crc.h.

byte CRC32C::GetCrcByte ( size_t  i) const
inline

Definition at line 63 of file crc.h.

void CRC32C::Reset ( )
inlineprotected

Definition at line 66 of file crc.h.

CRYPTOPP_STATIC_CONSTEXPR const char* CRC32C::StaticAlgorithmName ( )
inline

Definition at line 59 of file crc.h.

void CRC32C::TruncatedFinal ( byte digest,
size_t  digestSize 
)
virtual

Computes the hash of the current message.

Parameters
digesta pointer to the buffer to receive the hash
digestSizethe 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 354 of file crc.cpp.

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void CRC32C::Update ( const byte input,
size_t  length 
)
virtual

Updates a hash with additional input.

Parameters
inputthe additional input as a buffer
lengththe size of the buffer, in bytes

Implements HashTransformation.

Definition at line 300 of file crc.cpp.

void CRC32C::UpdateByte ( byte  b)
inline

Definition at line 62 of file crc.h.

Member Data Documentation

word32 CRC32C::m_crc
private

Definition at line 70 of file crc.h.

const word32 CRC32C::m_tab
staticprivate

Definition at line 69 of file crc.h.


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