Crypto++ 8.0 Free C++ class library of cryptographic schemes

Public Member Functions | List of all members
DL_GroupParameters_GFP Class Reference

GF(p) group parameters. More...

Inheritance diagram for DL_GroupParameters_GFP:

## Public Member Functions
bool | IsIdentity (const Integer &element) const
| Determines if an element is an identity. More...
void | SimultaneousExponentiate (Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const
bool | GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
| Get a named value. More...
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. More...
void | AssignFrom (const NameValuePairs &source)
| Assign values to this object. More...
const DL_FixedBasePrecomputation< Element > & | GetBasePrecomputation () const
| Retrieves the group precomputation. More...
DL_FixedBasePrecomputation< Element > & | AccessBasePrecomputation ()
| Retrieves the group precomputation. More...
const Integer & | GetModulus () const
const Integer & | GetGenerator () const
void | SetModulusAndSubgroupGenerator (const Integer &p, const Integer &g)
bool | operator== (const DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typename ModExpPrecomputation ::Element > > &rhs) const
bool | operator!= (const DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typename ModExpPrecomputation ::Element > > &rhs) const
Public Member Functions inherited from DL_GroupParametersImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typename ModExpPrecomputation ::Element >, DL_GroupParameters_IntegerBased >
const DL_GroupPrecomputation< Element > & | GetGroupPrecomputation () const
| Retrieves the group precomputation. More...
const DL_FixedBasePrecomputation< Element > & | GetBasePrecomputation () const
| Retrieves the group precomputation. More...
DL_FixedBasePrecomputation< Element > & | AccessBasePrecomputation ()
| Retrieves the group precomputation. More...
Public Member Functions inherited from DL_GroupParameters_IntegerBased
void | Initialize (const DL_GroupParameters_IntegerBased &params)
| Initialize a group parameters over integers. More...
void | Initialize (RandomNumberGenerator &rng, unsigned int pbits)
| Create a group parameters over integers. More...
void | Initialize (const Integer &p, const Integer &g)
| Initialize a group parameters over integers. More...
void | Initialize (const Integer &p, const Integer &q, const Integer &g)
| Initialize a group parameters over integers. More...
void | BERDecode (BufferedTransformation &bt)
| Decode this object from a BufferedTransformation. More...
void | DEREncode (BufferedTransformation &bt) const
| Encode this object into a BufferedTransformation. More...
void | GenerateRandom (RandomNumberGenerator &rng, const NameValuePairs &alg)
const Integer & | GetSubgroupOrder () const
| Retrieves the subgroup order. More...
Integer | GetGroupOrder () const
| Retrieves the order of the group. More...
bool | ValidateGroup (RandomNumberGenerator &rng, unsigned int level) const
| Check the group for errors. More...
bool | ValidateElement (unsigned int level, const Integer &element, const DL_FixedBasePrecomputation< Integer > *precomp) const
| Check the element for errors. More...
bool | FastSubgroupCheckAvailable () const
void | EncodeElement (bool reversible, const Element &element, byte *encoded) const
unsigned int | GetEncodedElementSize (bool reversible) const
| Retrieves the encoded element's size. More...
Integer | DecodeElement (const byte *encoded, bool checkForGroupMembership) const
| Decodes the element. More...
Integer | ConvertElementToInteger (const Element &element) const
| Converts an element to an Integer. More...
Integer | GetMaxExponent () const
| Retrieves the maximum exponent for the group. More...
OID | GetAlgorithmID () const
void | SetSubgroupOrder (const Integer &q)
Public Member Functions inherited from ASN1CryptoMaterial< DL_GroupParameters< Integer > >
void | Save (BufferedTransformation &bt) const
| DER encode ASN.1 object. More...
void | Load (BufferedTransformation &bt)
| BER decode ASN.1 object. More...
Public Member Functions inherited from ASN1Object
virtual void | BEREncode (BufferedTransformation &bt) const
| Encode this object into a BufferedTransformation. More...
Public Member Functions inherited from DL_GroupParameters< Integer >
bool | Validate (RandomNumberGenerator &rng, unsigned int level) const
| Check this object for errors. More...
bool | GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
| Get a named value. More...
bool | SupportsPrecomputation () const
| Determines whether the object supports precomputation. More...
void | Precompute (unsigned int precomputationStorage=16)
| Perform precomputation. More...
void | LoadPrecomputation (BufferedTransformation &storedPrecomputation)
| Retrieve previously saved precomputation. More...
void | SavePrecomputation (BufferedTransformation &storedPrecomputation) const
| Save precomputation for later use. More...
virtual const Element & | GetSubgroupGenerator () const
| Retrieves the subgroup generator. More...
virtual void | SetSubgroupGenerator (const Element &base)
| Sets the subgroup generator. More...
virtual Element | ExponentiateBase (const Integer &exponent) const
| Exponentiates the base. More...
virtual Element | ExponentiateElement (const Element &base, const Integer &exponent) const
| Exponentiates an element. More...
virtual Integer | GetCofactor () const
| Retrieves the cofactor. More...
virtual void | EncodeElement (bool reversible, const Element &element, byte *encoded) const=0
| Encodes the element. More...
virtual void | SimultaneousExponentiate (Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const=0
| Exponentiates a base to multiple exponents. More...
Public Member Functions inherited from GeneratableCryptoMaterial
void | GenerateRandomWithKeySize (RandomNumberGenerator &rng, unsigned int keySize)
| Generate a random key or crypto parameters. More...
Public Member Functions inherited from CryptoMaterial
virtual void | ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
| Check this object for errors. More...
void | DoQuickSanityCheck () const
| Perform a quick sanity check. More...
Public Member Functions inherited from NameValuePairs
template<class T >
bool | GetThisObject (T &object) const
| Get a copy of this object or subobject. More...
template<class T >
bool | GetThisPointer (T *&ptr) const
| Get a pointer to this object. More...
template<class T >
bool | GetValue (const char *name, T &value) const
| Get a named value. More...
template<class T >
T | GetValueWithDefault (const char *name, T defaultValue) const
| Get a named value. More...
std::string | GetValueNames () const
| Get a list of value names that can be retrieved. More...
bool | GetIntValue (const char *name, int &value) const
| Get a named value with type int. More...
int | GetIntValueWithDefault (const char *name, int defaultValue) const
| Get a named value with type int, with default. More...
bool | GetWord64Value (const char *name, word64 &value) const
| Get a named value with type word64. More...
word64 | GetWord64ValueWithDefault (const char *name, word64 defaultValue) const
| Get a named value with type word64, with default. More...
template<class T >
void | GetRequiredParameter (const char *className, const char *name, T &value) const
| Retrieves a required name/value pair. More...
void | GetRequiredIntParameter (const char *className, const char *name, int &value) const
| Retrieves a required name/value pair. More...

## Additional Inherited Members
Public Types inherited from DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation >
typedef ModExpPrecomputation ::Element | Element
Public Types inherited from DL_GroupParametersImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typename ModExpPrecomputation ::Element >, DL_GroupParameters_IntegerBased >
typedef ModExpPrecomputation | GroupPrecomputation
typedef ModExpPrecomputation ::Element | Element
typedef DL_FixedBasePrecomputationImpl< typename ModExpPrecomputation ::Element > | BasePrecomputation
Public Types inherited from DL_GroupParameters< Integer >
typedef Integer | Element
Static Public Member Functions inherited from DL_GroupParameters_IntegerBased
static std::string | StaticAlgorithmNamePrefix ()
Static Public Member Functions inherited from NameValuePairs
static void | ThrowIfTypeMismatch (const char *name, const std::type_info &stored, const std::type_info &retrieving)
| Ensures an expected name and type is present. More...

## Detailed Description

GF(p) group parameters.

Definition at line 156 of file gfpcrypt.h.

## Member Function Documentation

## ◆ IsIdentity()

bool DL_GroupParameters_GFP::IsIdentity | ( | const Integer & | element | ) | const
| inline virtual

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.

Implements DL_GroupParameters< Integer >.

Definition at line 162 of file gfpcrypt.h.

## ◆ GetVoidValue()

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

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_IntegerBased.

Definition at line 166 of file gfpcrypt.h.

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

- gfpcrypt.h
- gfpcrypt.cpp