r123::Threefry2x64_R< ROUNDS > Class Template Reference

#include <Random123/threefry.h>

Public Types
typedef threefry2x64_ctr_t	ctr_type
typedef threefry2x64_key_t	key_type
typedef threefry2x64_key_t	ukey_type

Public Member Functions
ctr_type	operator() (ctr_type ctr, key_type key)

Static Public Attributes
static const R123_METAL_CONSTANT_ADDRESS_SPACE unsigned int	rounds =ROUNDS

Detailed Description

template<unsigned int ROUNDS>
class r123::Threefry2x64_R< ROUNDS >

exports the member functions, typedefs and operator overloads required by a CBRNG class.

The template argument, ROUNDS, is the number of times the Threefry round function will be applied.

In November 2011, the authors discovered that 13 rounds of Threefry2x64 sequenced by strided, interleaved key and counter increments failed a very long (longer than the default BigCrush length) WeightDistrub test. At the same time, it was confirmed that 14 rounds passes much longer tests (up to 5x10^12 samples) of a similar nature. The authors know of no statistical flaws with ROUNDS=14 or more for Threefry2x64.

Member Typedef Documentation

ctr_type

template<unsigned int ROUNDS>

typedef threefry2x64_ctr_t r123::Threefry2x64_R< ROUNDS >::ctr_type

key_type

template<unsigned int ROUNDS>

typedef threefry2x64_key_t r123::Threefry2x64_R< ROUNDS >::key_type

ukey_type

template<unsigned int ROUNDS>

typedef threefry2x64_key_t r123::Threefry2x64_R< ROUNDS >::ukey_type

Member Function Documentation

operator()()

template<unsigned int ROUNDS>

ctr_type r123::Threefry2x64_R< ROUNDS >::operator() ( ctr_type  ctr, key_type  key  )

inline

Member Data Documentation

rounds

template<unsigned int ROUNDS>

const R123_METAL_CONSTANT_ADDRESS_SPACE unsigned int r123::Threefry2x64_R< ROUNDS >::rounds =ROUNDS

static

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

• Random123/threefry.h