helib::PowerfulConversion Class Reference

Conversion between powerful representation in R_m/(q) and zz_pX. More...

#include <powerful.h>

Public Member Functions
	PowerfulConversion ()
	PowerfulConversion (const PowerfulTranslationIndexes &ind)
void	initPConv (const PowerfulTranslationIndexes &ind)
void	restoreModulus () const
const CubeSignature &	getLongSig () const
const CubeSignature &	getShortSig () const
long	powerfulToPoly (NTL::zz_pX &poly, const HyperCube< NTL::zz_p > &powerful) const
long	polyToPowerful (HyperCube< NTL::zz_p > &powerful, const NTL::zz_pX &poly) const

Detailed Description

Conversion between powerful representation in R_m/(q) and zz_pX.

Usage pattern is as follows:

// compute tables for index translation PowerfulTranslationIndexes ind(mvec); // mvec is some factorization of m

// ... set the current zz_p::modulus to something before initializing PowerfulConversion pConv(ind);

// Alternatively use // PowerfulConversion pConv(); pConv.initPConv(ind); // Only the latter call needs zz_p::modulus to be defined

// A powerful basis is defined wrt same modulus and cube signature HyperCube<zz_p> powerful(pConv.getShortSig());

// ... some code here to initialize powerful // code can also do other stuff, perhaps changing zz_p::modulus

pConv.restoreModulus(); // restore zz_p::modulus zz_pX poly; // defined relative to the same modulus pConv.powerfulToPoly(poly, powerful);

// ... some more code here, perhaps changing zz_p::modulus again

pConv.restoreModulus(); // restore zz_p::modulus pConv.polyToPowerful(powerful, poly);

Constructor & Destructor Documentation

PowerfulConversion() [1/2]

helib::PowerfulConversion::PowerfulConversion ( )

inline

PowerfulConversion() [2/2]

helib::PowerfulConversion::PowerfulConversion ( const PowerfulTranslationIndexes &  ind )

inlineexplicit

Member Function Documentation

getLongSig()

const CubeSignature& helib::PowerfulConversion::getLongSig ( ) const

inline

getShortSig()

const CubeSignature& helib::PowerfulConversion::getShortSig ( ) const

inline

initPConv()

void helib::PowerfulConversion::initPConv ( const PowerfulTranslationIndexes &  ind )

inline

polyToPowerful()

long helib::PowerfulConversion::polyToPowerful	(	HyperCube< NTL::zz_p > &	powerful,
		const NTL::zz_pX &	poly
	)		const

powerfulToPoly()

long helib::PowerfulConversion::powerfulToPoly	(	NTL::zz_pX &	poly,
		const HyperCube< NTL::zz_p > &	powerful
	)		const

The conversion routines return the value of the modulus q. It is assumed that the modulus is already set before calling them

restoreModulus()

void helib::PowerfulConversion::restoreModulus ( ) const

inline