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# PublicBlumBlumShub Class Reference

`#include <blumshub.h>`

Inheritance diagram for PublicBlumBlumShub:

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 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

## 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().

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

- blumshub.h
- blumshub.cpp