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PublicBlumBlumShub Class Reference

#include <blumshub.h>

Inheritance diagram for PublicBlumBlumShub:

RandomNumberGenerator StreamTransformation Algorithm Algorithm Clonable Clonable BlumBlumShub List of all members.

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 ClonableClone () const
 this is not implemented by most classes yet

StreamTransformationRef ()
 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 (dword n)
 for random access ciphers, seek to an absolute position


Protected Attributes

const ModularArithmetic modn
const word maxBits
Integer current
int bitsLeft


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.

References GenerateByte().

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, and RandomPool.

Definition at line 88 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 114 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 441 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 448 of file cryptlib.h.

References StreamTransformation::MandatoryBlockSize().

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 73 of file cryptlib.cpp.

References StreamTransformation::MandatoryBlockSize(), StreamTransformation::MinLastBlockSize(), and StreamTransformation::ProcessData().


The documentation for this class was generated from the following files:
Generated on Mon Apr 19 18:12:45 2004 for Crypto++ by doxygen 1.3.6-20040222