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Public Member Functions | Private Attributes | Static Private Attributes | List of all members
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 ClonableClone () 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.

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)

Construct a Linear Congruential Generator (LCG)

init_seedthe 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 

Generate random array of bytes.

outputthe byte buffer
sizethe length of the buffer, in bytes

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

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 ( )

Definition at line 32 of file rng.h.

Member Data Documentation

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

Definition at line 39 of file rng.h.

const word32 LC_RNG::m =2147483647L

Definition at line 37 of file rng.h.

const word32 LC_RNG::q =44488L

Definition at line 38 of file rng.h.

const word16 LC_RNG::r =3399

Definition at line 40 of file rng.h.

word32 LC_RNG::seed

Definition at line 35 of file rng.h.

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