Crypto++
Public Member Functions | Static Public Member Functions | Static Public Attributes | Protected Member Functions | List of all members
CRC32 Class Reference

CRC Checksum Calculation. More...

#include <crc.h>

Inheritance diagram for CRC32:
HashTransformation Algorithm Clonable

Public Member Functions

void Update (const byte *input, size_t length)
 process more input
 
void TruncatedFinal (byte *hash, size_t size)
 truncated version of Final()
 
unsigned int DigestSize () const
 size of the hash/digest/MAC returned by Final()
 
std::string AlgorithmName () const
 returns name of this algorithm, not universally implemented yet
 
void UpdateByte (byte b)
 
byte GetCrcByte (size_t i) const
 
HashTransformationRef ()
 return a reference to this object, useful for passing a temporary object to a function that takes a non-const reference
 
virtual byte * CreateUpdateSpace (size_t &size)
 request space to write input into
 
virtual void Final (byte *digest)
 compute hash for current message, then restart for a new message More...
 
virtual void Restart ()
 discard the current state, and restart with a new message
 
unsigned int TagSize () const
 same as DigestSize()
 
virtual unsigned int BlockSize () const
 block size of underlying compression function, or 0 if not block based
 
virtual unsigned int OptimalBlockSize () const
 input to Update() should have length a multiple of this for optimal speed
 
virtual unsigned int OptimalDataAlignment () const
 returns how input should be aligned for optimal performance
 
virtual void CalculateDigest (byte *digest, const byte *input, size_t length)
 use this if your input is in one piece and you don't want to call Update() and Final() separately
 
virtual bool Verify (const byte *digest)
 verify that digest is a valid digest for the current message, then reinitialize the object More...
 
virtual bool VerifyDigest (const byte *digest, const byte *input, size_t length)
 use this if your input is in one piece and you don't want to call Update() and Verify() separately
 
virtual void CalculateTruncatedDigest (byte *digest, size_t digestSize, const byte *input, size_t length)
 truncated version of CalculateDigest()
 
virtual bool TruncatedVerify (const byte *digest, size_t digestLength)
 truncated version of Verify()
 
virtual bool VerifyTruncatedDigest (const byte *digest, size_t digestLength, const byte *input, size_t length)
 truncated version of VerifyDigest()
 
virtual ClonableClone () const
 this is not implemented by most classes yet
 

Static Public Member Functions

static const char * StaticAlgorithmName ()
 

Static Public Attributes

static const int DIGESTSIZE = 4
 

Protected Member Functions

void ThrowIfInvalidTruncatedSize (size_t size) const
 

Detailed Description

CRC Checksum Calculation.

Definition at line 19 of file crc.h.

Member Function Documentation

virtual void HashTransformation::Final ( byte *  digest)
inlinevirtualinherited

compute hash for current message, then restart for a new message

Precondition
size of digest == DigestSize().

Definition at line 544 of file cryptlib.h.

Referenced by PKCS5_PBKDF2_HMAC< T >::DeriveKey().

virtual bool HashTransformation::Verify ( const byte *  digest)
inlinevirtualinherited

verify that digest is a valid digest for the current message, then reinitialize the object

Default implementation is to call Final() and do a bitwise comparison between its output and digest.

Definition at line 574 of file cryptlib.h.


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