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# RandomNumberGenerator Class Reference

`#include <cryptlib.h>`

Inheritance diagram for RandomNumberGenerator:

List of all members.

## Detailed Description

interface for random number generators

All return values are uniformly distributed over the range specified.

Definition at line 624 of file cryptlib.h.

## Public Member Functions
virtual byte | GenerateByte ()=0
| 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
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

## Member Function Documentation

unsigned int RandomNumberGenerator::GenerateBit | ( |  | ) | `[virtual]`

generate new random bit and return it

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

Reimplemented in PublicBlumBlumShub.

Definition at line 117 of file cryptlib.cpp.

References GenerateByte().

Referenced by XTR_FindPrimesAndGenerator().

void RandomNumberGenerator::GenerateBlock | ( | byte * | output,
|  | size_t | size |
| ) |  |  | `[virtual]`

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 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]`

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 GenerateByte().

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

- cryptlib.h
- cryptlib.cpp