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PublicBlumBlumShub Class Reference

BlumBlumShub without factorization of the modulus. More...

#include <blumshub.h>

Inheritance diagram for PublicBlumBlumShub:
RandomNumberGenerator StreamTransformation Algorithm Algorithm Clonable Clonable BlumBlumShub

List of all members.

Public Member Functions

 PublicBlumBlumShub (const Integer &n, const Integer &seed)
unsigned int GenerateBit ()
byte GenerateByte ()
void GenerateBlock (byte *output, size_t size)
void ProcessData (byte *outString, const byte *inString, size_t 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 void IncorporateEntropy (const byte *input, size_t length)
 update RNG state with additional unpredictable values
virtual bool CanIncorporateEntropy () const
 returns true if IncorporateEntropy is implemented
virtual byte GenerateByte ()
 generate new random byte and return it
virtual unsigned int GenerateBit ()
 generate new random bit and return it
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, size_t size)
 generate random array of bytes
virtual void DiscardBytes (size_t n)
 generate and discard n bytes
virtual void GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword length)
 generate random bytes as input to a BufferedTransformation
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, useful for passing a temporary object to a function that takes a non-const reference
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, size_t 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, size_t length)
 same as ProcessData(inoutString, inoutString, length)
void ProcessString (byte *outString, const byte *inString, size_t 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

ModularArithmetic modn
word maxBits
word bitsLeft
Integer current


class BlumGoldwasserPublicKey
class BlumGoldwasserPrivateKey

Detailed Description

BlumBlumShub without factorization of the modulus.

Definition at line 12 of file blumshub.h.

Member Function Documentation

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

encrypt or decrypt an array of bytes of specified length

either inString == outString, or they don't overlap

Implements StreamTransformation.

Definition at line 41 of file blumshub.cpp.

unsigned int RandomNumberGenerator::GenerateBit (  )  [virtual, inherited]

generate new random bit and return it

Default implementation is to call GenerateByte() and return its lowest bit.

Definition at line 236 of file cryptlib.cpp.

References RandomNumberGenerator::GenerateByte().

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

returns the input block size that is most efficient for this cipher

optimal input length is n * OptimalBlockSize() - GetOptimalBlockSizeUsed() for any n > 0

Reimplemented in ECB_OneWay.

Definition at line 481 of file cryptlib.h.

void StreamTransformation::ProcessLastBlock ( byte *  outString,
const byte *  inString,
size_t  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.

Reimplemented in CBC_CTS_Encryption, and CBC_CTS_Decryption.

Definition at line 194 of file cryptlib.cpp.

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

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