PublicBlumBlumShub Class Reference

#include <blumshub.h>

Inheritance diagram for PublicBlumBlumShub:

List of all members.

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Detailed Description

BlumBlumShub without factorization of the modulus.

Definition at line 12 of file blumshub.h.

Public Member Functions
	PublicBlumBlumShub (const Integer &n, const Integer &seed)
unsigned int	GenerateBit ()
	generate new random bit and return it
byte	GenerateByte ()
	generate new random byte and return it
void	ProcessData (byte *outString, const byte *inString, unsigned int length)
	encrypt or decrypt an array of bytes of specified length
bool	IsSelfInverting () const
	returns whether this transformation is self-inverting (e.g. xor with a keystream)
bool	IsForwardTransformation () const
	returns whether this is an encryption object
virtual word32	GenerateWord32 (word32 a=0, word32 b=0xffffffffL)
	generate a random 32 bit word in the range min to max, inclusive
virtual void	GenerateBlock (byte *output, unsigned int size)
	generate random array of bytes
virtual void	DiscardBytes (unsigned int n)
	generate and discard n bytes
template<class IT> void	Shuffle (IT begin, IT end)
	randomly shuffle the specified array, resulting permutation is uniformly distributed
virtual std::string	AlgorithmName () const
	returns name of this algorithm, not universally implemented yet
virtual Clonable *	Clone () const
	this is not implemented by most classes yet
StreamTransformation &	Ref ()
	return a reference to this object,
virtual unsigned int	MandatoryBlockSize () const
	returns block size, if input must be processed in blocks, otherwise 1
virtual unsigned int	OptimalBlockSize () const
	returns the input block size that is most efficient for this cipher
virtual unsigned int	GetOptimalBlockSizeUsed () const
	returns how much of the current block is used up
virtual unsigned int	OptimalDataAlignment () const
	returns how input should be aligned for optimal performance
virtual void	ProcessLastBlock (byte *outString, const byte *inString, unsigned int length)
	for ciphers where the last block of data is special, encrypt or decrypt the last block of data
virtual unsigned int	MinLastBlockSize () const
	returns the minimum size of the last block, 0 indicating the last block is not special
void	ProcessString (byte *inoutString, unsigned int length)
	same as ProcessData(inoutString, inoutString, length)
void	ProcessString (byte *outString, const byte *inString, unsigned int length)
	same as ProcessData(outString, inString, length)
byte	ProcessByte (byte input)
	implemented as {ProcessData(&input, &input, 1); return input;}
virtual bool	IsRandomAccess () const =0
	returns whether this cipher supports random access
virtual void	Seek (lword n)
	for random access ciphers, seek to an absolute position
Protected Attributes
const ModularArithmetic	modn
const word	maxBits
Integer	current
int	bitsLeft

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Member Function Documentation

unsigned int PublicBlumBlumShub::GenerateBit (   )  [virtual]

generate new random bit and return it Default implementation is to call GenerateByte() and return its parity. Reimplemented from RandomNumberGenerator. Definition at line 16 of file blumshub.cpp. References Integer::GetBit(), and ModularArithmetic::Square(). Referenced by GenerateByte().

void PublicBlumBlumShub::ProcessData (  byte *  outString, const byte *  inString, unsigned int  length )  [inline, virtual]

encrypt or decrypt an array of bytes of specified length Note: either inString == outString, or they don't overlap Implements StreamTransformation. Definition at line 21 of file blumshub.h.

void RandomNumberGenerator::GenerateBlock (  byte *  output, unsigned int  size )  [virtual, inherited]

generate random array of bytes Default implementation is to call GenerateByte() size times. Reimplemented in NonblockingRng, BlockingRng, and RandomPool. Definition at line 116 of file cryptlib.cpp. References RandomNumberGenerator::GenerateByte(). Referenced by DL_GroupParameters_DSA::GenerateRandom().

void RandomNumberGenerator::DiscardBytes (  unsigned int  n  )  [virtual, inherited]

generate and discard n bytes Default implementation is to call GenerateByte() n times. Reimplemented in ARC4_Base. Definition at line 142 of file cryptlib.cpp. References RandomNumberGenerator::GenerateByte().

StreamTransformation& StreamTransformation::Ref (   )  [inline, inherited]

return a reference to this object, This function is useful for passing a temporary StreamTransformation object to a function that takes a non-const reference. Definition at line 464 of file cryptlib.h.

virtual unsigned int StreamTransformation::OptimalBlockSize (   )  const [inline, virtual, inherited]

returns the input block size that is most efficient for this cipher Note: optimal input length is n * OptimalBlockSize() - GetOptimalBlockSizeUsed() for any n > 0 Definition at line 471 of file cryptlib.h.

void StreamTransformation::ProcessLastBlock (  byte *  outString, const byte *  inString, unsigned int  length )  [virtual, inherited]

for ciphers where the last block of data is special, encrypt or decrypt the last block of data For now the only use of this function is for CBC-CTS mode. Definition at line 101 of file cryptlib.cpp. References StreamTransformation::MandatoryBlockSize(), StreamTransformation::MinLastBlockSize(), and StreamTransformation::ProcessData().

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

• blumshub.h
• blumshub.cpp

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