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, 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 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
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, 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

Friends

class BlumGoldwasserPublicKey
class BlumGoldwasserPrivateKey


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 bitsLeft, current, Integer::GetBit(), maxBits, modn, and ModularArithmetic::Square().

Referenced by GenerateByte().

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

generate random array of bytes

Default implementation is to call GenerateByte() size times.

Reimplemented in KDF2_RNG, NonblockingRng, BlockingRng, and RandomPool.

Definition at line 122 of file cryptlib.cpp.

References RandomNumberGenerator::GenerateByte().

Referenced by PSSR_MEM_Base::ComputeMessageRepresentative(), DL_GroupParameters_DSA::GenerateRandom(), OAEP_Base::Pad(), Integer::Randomize(), PolynomialMod2::Randomize(), and ElGamalBase::SymmetricEncrypt().

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

generate and discard n bytes

Default implementation is to call GenerateByte() n times.

Reimplemented in ARC4_Base.

Definition at line 148 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 466 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

Reimplemented in ECB_OneWay.

Definition at line 473 of file cryptlib.h.

Referenced by StreamTransformationFilter::FirstPut().

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 107 of file cryptlib.cpp.

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

Referenced by StreamTransformationFilter::LastPut().


The documentation for this class was generated from the following files:
Generated on Sat Dec 23 02:07:31 2006 for Crypto++ by  doxygen 1.5.1-p1