BlumBlumShub Class Reference

BlumBlumShub with factorization of the modulus. More...

#include <blumshub.h>

Inheritance diagram for BlumBlumShub:

Public Member Functions
	BlumBlumShub (const Integer &p, const Integer &q, const Integer &seed)
	Construct a BlumBlumShub.
bool	IsRandomAccess () const
	Determines whether the cipher supports random access.
void	Seek (lword index)
	Seek to an absolute position.
Public Member Functions inherited from PublicBlumBlumShub
	PublicBlumBlumShub (const Integer &n, const Integer &seed)
	Construct a PublicBlumBlumShub.
unsigned int	GenerateBit ()
	Generate new random bit and return it.
byte	GenerateByte ()
	Generate new random byte and return it.
void	GenerateBlock (byte *output, size_t size)
	Generate random array of bytes.
void	ProcessData (byte *outString, const byte *inString, size_t length)
	Encrypt or decrypt an array of bytes.
bool	IsSelfInverting () const
	Determines whether the cipher is self-inverting.
bool	IsForwardTransformation () const
	Determines if the cipher is being operated in its forward direction.
Public Member Functions inherited from RandomNumberGenerator
virtual void	IncorporateEntropy (const byte *input, size_t length)
	Update RNG state with additional unpredictable values.
virtual bool	CanIncorporateEntropy () const
	Determines if a generator can accept additional entropy.
virtual word32	GenerateWord32 (word32 min=0, word32 max=0xffffffffUL)
	Generate a random 32 bit word in the range min to max, inclusive.
virtual void	GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword length)
	Generate random bytes into a BufferedTransformation.
virtual void	DiscardBytes (size_t n)
	Generate and discard n bytes.
template<class IT >
void	Shuffle (IT begin, IT end)
	Randomly shuffle the specified array.
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.
Public Member Functions inherited from StreamTransformation
StreamTransformation &	Ref ()
	Provides a reference to this object.
virtual unsigned int	MandatoryBlockSize () const
	Provides the mandatory block size of the cipher.
virtual unsigned int	OptimalBlockSize () const
	Provides the input block size most efficient for this cipher.
virtual unsigned int	GetOptimalBlockSizeUsed () const
	Provides the number of bytes used in the current block when processing at optimal block size.
virtual unsigned int	OptimalDataAlignment () const
	Provides input and output data alignment for optimal performance.
virtual size_t	ProcessLastBlock (byte *outString, size_t outLength, const byte *inString, size_t inLength)
	Encrypt or decrypt the last block of data.
virtual unsigned int	MinLastBlockSize () const
	Provides the size of the last block.
virtual bool	IsLastBlockSpecial () const
	Determines if the last block receives special processing.
void	ProcessString (byte *inoutString, size_t length)
	Encrypt or decrypt a string of bytes.
void	ProcessString (byte *outString, const byte *inString, size_t length)
	Encrypt or decrypt a string of bytes.
byte	ProcessByte (byte input)
	Encrypt or decrypt a byte.

Protected Attributes
const Integer	p
const Integer	q
const Integer	x0
Protected Attributes inherited from PublicBlumBlumShub
ModularArithmetic	modn
Integer	current
word	maxBits
word	bitsLeft

Detailed Description

BlumBlumShub with factorization of the modulus.

You should reseed the generator after a fork() to avoid multiple generators with the same internal state.

Definition at line 47 of file blumshub.h.

Constructor & Destructor Documentation

~BlumBlumShub()

virtual BlumBlumShub::~BlumBlumShub ( )

inlinevirtual

Definition at line 50 of file blumshub.h.

BlumBlumShub()

BlumBlumShub::BlumBlumShub	(	const Integer &	p,
		const Integer &	q,
		const Integer &	seed
	)

Construct a BlumBlumShub.

Parameters

p	the first prime factor
q	the second prime factor
seed	the seed for the generator

Esure p and q are both primes congruent to 3 mod 4 and at least 512 bits long. seed is the secret key and should be about as large as p*q.

Definition at line 48 of file blumshub.cpp.

Member Function Documentation

IsRandomAccess()

bool BlumBlumShub::IsRandomAccess ( ) const

inlinevirtual

Determines whether the cipher supports random access.

Returns

true if the cipher supports random access, false otherwise

Implements StreamTransformation.

Definition at line 60 of file blumshub.h.

Seek()

void BlumBlumShub::Seek ( lword  pos )

virtual

Seek to an absolute position.

Parameters

pos	position to seek

Exceptions

NotImplemented

The base class implementation throws NotImplemented. The function asserts IsRandomAccess() in debug builds.

Reimplemented from StreamTransformation.

Definition at line 55 of file blumshub.cpp.

Member Data Documentation

p

const Integer BlumBlumShub::p

protected

Definition at line 64 of file blumshub.h.

q

const Integer BlumBlumShub::q

protected

Definition at line 64 of file blumshub.h.

x0

const Integer BlumBlumShub::x0

protected

Definition at line 65 of file blumshub.h.

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

• G:/work/subversion/scol-technologies/trunk/scol/plugins/security/cryptopp/blumshub.h
• G:/work/subversion/scol-technologies/trunk/scol/plugins/security/cryptopp/blumshub.cpp