Interface for random number generators. More...

#include <cryptlib.h>

Inheritance diagram for RandomNumberGenerator:

Collaboration diagram for RandomNumberGenerator:

Public Member Functions
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	GenerateBlock (byte *output, size_t size)
	Generate random array of bytes. 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...

Detailed Description

Interface for random number generators.

The library provides a number of random number generators, from software based to hardware based generators.

All generated values are uniformly distributed over the range specified.

Definition at line 1188 of file cryptlib.h.

Constructor & Destructor Documentation

virtual RandomNumberGenerator::~RandomNumberGenerator ( )

inlinevirtual

Definition at line 1191 of file cryptlib.h.

Member Function Documentation

virtual bool RandomNumberGenerator::CanIncorporateEntropy ( ) const

inlinevirtual

Determines if a generator can accept additional entropy.

Returns: true if IncorporateEntropy() is implemented

Reimplemented in RandomPool, and NIST_DRBG.

Definition at line 1209 of file cryptlib.h.

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void RandomNumberGenerator::DiscardBytes ( size_t n )

virtual

Generate and discard n bytes.

Parameters

n	the number of bytes to generate and discard

Reimplemented in RDSEED, MersenneTwister< K, M, N, F, S >, RDRAND, and Weak1::ARC4_Base.

Definition at line 339 of file cryptlib.cpp.

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unsigned int RandomNumberGenerator::GenerateBit ( )

virtual

Generate new random bit and return it.

Returns: a random bit

The default implementation calls GenerateByte() and return its lowest bit.

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

Reimplemented in PublicBlumBlumShub.

Definition at line 286 of file cryptlib.cpp.

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void RandomNumberGenerator::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 in KDF2_RNG, ClassNullRNG, AdditiveCipherTemplate< BASE >, AdditiveCipherTemplate< AbstractPolicyHolder< AdditiveCipherAbstractPolicy, CTR_ModePolicy > >, Hash_DRBG< HASH, STRENGTH, SEEDLENGTH >, RDSEED, RDRAND, NIST_DRBG, FixedRNG, MersenneTwister< K, M, N, F, S >, LC_RNG, Weak1::ARC4_Base, and PublicBlumBlumShub.

Definition at line 326 of file cryptlib.cpp.

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byte RandomNumberGenerator::GenerateByte ( )

virtual

Generate new random byte and return it.

Returns: a random 8-bit byte

Default implementation calls GenerateBlock() with one byte.

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

Reimplemented in PublicBlumBlumShub.

Definition at line 291 of file cryptlib.cpp.

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void RandomNumberGenerator::GenerateIntoBufferedTransformation	(	BufferedTransformation &	target,
		const std::string &	channel,
		lword	length
	)

virtual

Generate random bytes into a BufferedTransformation.

Parameters

target	the BufferedTransformation object which receives the bytes
channel	the channel on which the bytes should be pumped
length	the number of bytes to generate

The default implementation calls GenerateBlock() and pumps the result into the DEFAULT_CHANNEL of the target.

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 in X917RNG, and RandomPool.

Definition at line 344 of file cryptlib.cpp.

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word32 RandomNumberGenerator::GenerateWord32	(	word32	min = `0`,
		word32	max = `0xffffffffUL`
	)

virtual

Generate a random 32 bit word in the range min to max, inclusive.

Parameters

min	the lower bound of the range
max	the upper bound of the range

Returns: a random 32-bit word

The default implementation calls Crop() on the difference between max and min, and then returns the result added to min.

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

Reimplemented in MersenneTwister< K, M, N, F, S >.

Definition at line 298 of file cryptlib.cpp.

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virtual void RandomNumberGenerator::IncorporateEntropy	(	const byte *	input,
		size_t	length
	)

inlinevirtual

Update RNG state with additional unpredictable values.

Parameters

input	the entropy to add to the generator
length	the size of the input buffer

Exceptions

NotImplemented

A generator may or may not accept additional entropy. Call CanIncorporateEntropy() to test for the ability to use additional entropy.

If a derived class does not override IncorporateEntropy(), then the base class throws NotImplemented.

Reimplemented in Hash_DRBG< HASH, STRENGTH, SEEDLENGTH >, RDSEED, RDRAND, RandomPool, and NIST_DRBG.

Definition at line 1201 of file cryptlib.h.

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template<class IT >

void RandomNumberGenerator::Shuffle	(	IT	begin,
		IT	end
	)

inline

Randomly shuffle the specified array.

Parameters

begin	an iterator to the first element in the array
end	an iterator beyond the last element in the array

The resulting permutation is uniformly distributed.

Definition at line 1264 of file cryptlib.h.

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

src/cryptopp/cryptlib.h
src/cryptopp/cryptlib.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation