LC_RNG Class Reference

Linear Congruential Generator (LCG) More...

#include <rng.h>

Inheritance diagram for LC_RNG:

Collaboration diagram for LC_RNG:

Public Member Functions
	LC_RNG (word32 init_seed)
	Construct a Linear Congruential Generator (LCG) More...
void	GenerateBlock (byte *output, size_t size)
	Generate random array of bytes. More...
word32	GetSeed ()
Public Member Functions inherited from RandomNumberGenerator
virtual	~RandomNumberGenerator ()
virtual void	IncorporateEntropy (const byte *input, size_t length)
	Update RNG state with additional unpredictable values. More...
virtual bool	CanIncorporateEntropy () const
	Determines if a generator can accept additional entropy. More...
virtual byte	GenerateByte ()
	Generate new random byte and return it. More...
virtual unsigned int	GenerateBit ()
	Generate new random bit and return it. More...
virtual word32	GenerateWord32 (word32 min=0, word32 max=0xffffffffUL)
	Generate a random 32 bit word in the range min to max, inclusive. More...
virtual void	GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword length)
	Generate random bytes into a BufferedTransformation. More...
virtual void	DiscardBytes (size_t n)
	Generate and discard n bytes. More...
template<class IT >
void	Shuffle (IT begin, IT end)
	Randomly shuffle the specified array. More...
Public Member Functions inherited from Algorithm
virtual	~Algorithm ()
	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms. More...
virtual std::string	AlgorithmName () const
	Provides the name of this algorithm. More...
Public Member Functions inherited from Clonable
virtual	~Clonable ()
virtual Clonable *	Clone () const
	Copies this object. More...

Private Attributes
word32	seed

Static Private Attributes
static const word32	m =2147483647L
static const word32	q =44488L
static const word16	a =(unsigned int)48271L
static const word16	r =3399

Detailed Description

Linear Congruential Generator (LCG)

Originally propsed by William S. England.

Warning

LC_RNG is suitable for simulations, where uniformaly distrubuted numbers are required quickly. It should not be used for cryptographic purposes.

Definition at line 22 of file rng.h.

Constructor & Destructor Documentation

LC_RNG::LC_RNG ( word32  init_seed )

inline

Construct a Linear Congruential Generator (LCG)

Parameters

init_seed

the initial value for the generator

Definition at line 27 of file rng.h.

Member Function Documentation

void LC_RNG::GenerateBlock ( byte *  output, size_t  size  )

virtual

Generate random array of bytes.

Parameters

output	the byte buffer
size	the length of the buffer, in bytes

All generated values are uniformly distributed over the range specified within the the constraints of a particular generator.

Note

A derived generator must override either GenerateBlock() or GenerateIntoBufferedTransformation(). They can override both, or have one call the other.

Reimplemented from RandomNumberGenerator.

Definition at line 39 of file rng.cpp.

word32 LC_RNG::GetSeed ( )

inline

Definition at line 32 of file rng.h.

Member Data Documentation

const word16 LC_RNG::a =(unsigned int)48271L

staticprivate

Definition at line 39 of file rng.h.

const word32 LC_RNG::m =2147483647L

staticprivate

Definition at line 37 of file rng.h.

const word32 LC_RNG::q =44488L

staticprivate

Definition at line 38 of file rng.h.

const word16 LC_RNG::r =3399

staticprivate

Definition at line 40 of file rng.h.

word32 LC_RNG::seed

private

Definition at line 35 of file rng.h.

---

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

• src/cryptopp/rng.h
• src/cryptopp/rng.cpp