DL_GroupParameters_GFP Class Reference

GF(p) group parameters. More...

#include <gfpcrypt.h>

Inheritance diagram for DL_GroupParameters_GFP:

Public Member Functions
bool	IsIdentity (const Integer &element) const
	Determines if an element is an identity.
void	SimultaneousExponentiate (Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const
	Exponentiates a base to multiple exponents.
bool	GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
	Get a named value.
Element	MultiplyElements (const Element &a, const Element &b) const
Element	CascadeExponentiate (const Element &element1, const Integer &exponent1, const Element &element2, const Integer &exponent2) const
Public Member Functions inherited from DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation >
bool	GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
	Get a named value.
void	AssignFrom (const NameValuePairs &source)
	Assign values to this object.
const DL_FixedBasePrecomputation< Element > &	GetBasePrecomputation () const
	Retrieves the group precomputation.
DL_FixedBasePrecomputation< Element > &	AccessBasePrecomputation ()
	Retrieves the group precomputation.
const Integer &	GetModulus () const
	Retrieve the modulus for the group.
const Integer &	GetGenerator () const
	Retrieves a reference to the group generator.
void	SetModulusAndSubgroupGenerator (const Integer &p, const Integer &g)
bool	operator== (const DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typename GROUP_PRECOMP::Element > > &rhs) const
bool	operator!= (const DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typename GROUP_PRECOMP::Element > > &rhs) const
Public Member Functions inherited from DL_GroupParametersImpl< GROUP_PRECOMP, BASE_PRECOMP, BASE >
const DL_GroupPrecomputation< Element > &	GetGroupPrecomputation () const
	Retrieves the group precomputation.
const DL_FixedBasePrecomputation< Element > &	GetBasePrecomputation () const
	Retrieves the group precomputation.
DL_FixedBasePrecomputation< Element > &	AccessBasePrecomputation ()
	Retrieves the group precomputation.
Public Member Functions inherited from DL_GroupParameters< T >
bool	Validate (RandomNumberGenerator &rng, unsigned int level) const
	Check this object for errors.
bool	SupportsPrecomputation () const
	Determines whether the object supports precomputation.
void	Precompute (unsigned int precomputationStorage=16)
	Perform precomputation.
void	LoadPrecomputation (BufferedTransformation &storedPrecomputation)
	Retrieve previously saved precomputation.
void	SavePrecomputation (BufferedTransformation &storedPrecomputation) const
	Save precomputation for later use.
virtual const Element &	GetSubgroupGenerator () const
	Retrieves the subgroup generator.
virtual void	SetSubgroupGenerator (const Element &base)
	Sets the subgroup generator.
virtual Element	ExponentiateBase (const Integer &exponent) const
	Exponentiates the base.
virtual Element	ExponentiateElement (const Element &base, const Integer &exponent) const
	Exponentiates an element.
virtual const Integer &	GetSubgroupOrder () const =0
	Retrieves the subgroup order.
virtual Integer	GetMaxExponent () const =0
	Retrieves the maximum exponent for the group.
virtual Integer	GetGroupOrder () const
	Retrieves the order of the group.
virtual Integer	GetCofactor () const
	Retrieves the cofactor.
virtual unsigned int	GetEncodedElementSize (bool reversible) const =0
	Retrieves the encoded element's size.
virtual void	EncodeElement (bool reversible, const Element &element, byte *encoded) const =0
	Encodes the element.
virtual Element	DecodeElement (const byte *encoded, bool checkForGroupMembership) const =0
	Decodes the element.
virtual Integer	ConvertElementToInteger (const Element &element) const =0
	Converts an element to an Integer.
virtual bool	ValidateGroup (RandomNumberGenerator &rng, unsigned int level) const =0
	Check the group for errors.
virtual bool	ValidateElement (unsigned int level, const Element &element, const DL_FixedBasePrecomputation< Element > *precomp) const =0
	Check the element for errors.
virtual bool	FastSubgroupCheckAvailable () const =0
virtual bool	IsIdentity (const Element &element) const =0
	Determines if an element is an identity.
virtual void	SimultaneousExponentiate (Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const =0
	Exponentiates a base to multiple exponents.
Public Member Functions inherited from GeneratableCryptoMaterial
virtual void	GenerateRandom (RandomNumberGenerator &rng, const NameValuePairs &params=g_nullNameValuePairs)
	Generate a random key or crypto parameters.
void	GenerateRandomWithKeySize (RandomNumberGenerator &rng, unsigned int keySize)
	Generate a random key or crypto parameters.
Public Member Functions inherited from CryptoMaterial
virtual void	ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
	Check this object for errors.
virtual void	Save (BufferedTransformation &bt) const
	Saves a key to a BufferedTransformation.
virtual void	Load (BufferedTransformation &bt)
	Loads a key from a BufferedTransformation.
void	DoQuickSanityCheck () const
	Perform a quick sanity check.
Public Member Functions inherited from NameValuePairs
template<class T >
bool	GetThisObject (T &object) const
	Get a copy of this object or subobject.
template<class T >
bool	GetThisPointer (T *&ptr) const
	Get a pointer to this object.
template<class T >
bool	GetValue (const char *name, T &value) const
	Get a named value.
template<class T >
T	GetValueWithDefault (const char *name, T defaultValue) const
	Get a named value.
CRYPTOPP_DLL std::string	GetValueNames () const
	Get a list of value names that can be retrieved.
CRYPTOPP_DLL bool	GetIntValue (const char *name, int &value) const
	Get a named value with type int.
CRYPTOPP_DLL int	GetIntValueWithDefault (const char *name, int defaultValue) const
	Get a named value with type int, with default.
CRYPTOPP_DLL bool	GetWord64Value (const char *name, word64 &value) const
	Get a named value with type word64.
CRYPTOPP_DLL word64	GetWord64ValueWithDefault (const char *name, word64 defaultValue) const
	Get a named value with type word64, with default.
template<class T >
void	GetRequiredParameter (const char *className, const char *name, T &value) const
	Retrieves a required name/value pair.
CRYPTOPP_DLL void	GetRequiredIntParameter (const char *className, const char *name, int &value) const
	Retrieves a required name/value pair.

Additional Inherited Members
Public Types inherited from DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation >
typedef GROUP_PRECOMP::Element	Element
Public Types inherited from DL_GroupParametersImpl< GROUP_PRECOMP, BASE_PRECOMP, BASE >
typedef GROUP_PRECOMP	GroupPrecomputation
typedef GROUP_PRECOMP::Element	Element
typedef BASE_PRECOMP	BasePrecomputation
Public Types inherited from DL_GroupParameters< T >
typedef T	Element
Static Public Member Functions inherited from NameValuePairs
static CRYPTOPP_DLL void	ThrowIfTypeMismatch (const char *name, const std::type_info &stored, const std::type_info &retrieving)
	Ensures an expected name and type is present.

Detailed Description

GF(p) group parameters.

Definition at line 224 of file gfpcrypt.h.

Constructor & Destructor Documentation

~DL_GroupParameters_GFP()

virtual DL_GroupParameters_GFP::~DL_GroupParameters_GFP ( )

inlinevirtual

Definition at line 227 of file gfpcrypt.h.

Member Function Documentation

IsIdentity()

bool DL_GroupParameters_GFP::IsIdentity ( const Integer & element ) const

inline

Determines if an element is an identity.

Parameters

element

element to check

Returns

true if the element is an identity, false otherwise

The identity element or or neutral element is a special element in a group that leaves other elements unchanged when combined with it.

IsIdentity() must be implemented in a derived class.

Definition at line 235 of file gfpcrypt.h.

SimultaneousExponentiate()

void DL_GroupParameters_GFP::SimultaneousExponentiate	(	Element *	results,
		const Element &	base,
		const Integer *	exponents,
		unsigned int	exponentsCount ) const

Exponentiates a base to multiple exponents.

Parameters

results	an array of Elements
base	the base to raise to the exponents
exponents	an array of exponents
exponentsCount	the number of exponents in the array

SimultaneousExponentiate() raises the base to each exponent in the exponents array and stores the result at the respective position in the results array.

SimultaneousExponentiate() must be implemented in a derived class.

Precondition

COUNTOF(results) == exponentsCount

COUNTOF(exponents) == exponentsCount

GetVoidValue()

bool DL_GroupParameters_GFP::GetVoidValue ( const char * name, const std::type_info & valueType, void * pValue ) const

inlinevirtual

Get a named value.

Parameters

name	the name of the object or value to retrieve
valueType	reference to a variable that receives the value
pValue	void pointer to a variable that receives the value

Returns

true if the value was retrieved, false otherwise

GetVoidValue() retrieves the value of name if it exists.

Note

GetVoidValue() is an internal function and should be implemented by derived classes. Users should use one of the other functions instead.

See also

GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(), GetRequiredParameter() and GetRequiredIntParameter()

Reimplemented from DL_GroupParameters< T >.

Definition at line 260 of file gfpcrypt.h.

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

• gfpcrypt.h