DL_GroupParameters_EC< EC > Class Template Reference

#include <eccrypto.h>

Inheritance diagram for DL_GroupParameters_EC< EC >:

DL_GroupParametersImpl< EcPrecomputation< EC > > DL_GroupParameters< typenameEcPrecomputation< EC >::Element > CryptoParameters GeneratableCryptoMaterial CryptoMaterial NameValuePairs List of all members.

Detailed Description

template<class EC>
class DL_GroupParameters_EC< EC >

Elliptic Curve Parameters.

This class corresponds to the ASN.1 sequence of the same name in ANSI X9.62 (also SEC 1).

Definition at line 25 of file eccrypto.h.

Public Types

typedef EC EllipticCurve
typedef EllipticCurve::Point Point
typedef Point Element
typedef IncompatibleCofactorMultiplication DefaultCofactorOption
typedef EcPrecomputation< EC > GroupPrecomputation
typedef DL_FixedBasePrecomputationImpl<
typenameEcPrecomputation<
EC >::Element
BasePrecomputation

Public Member Functions

 DL_GroupParameters_EC ()
 DL_GroupParameters_EC (const OID &oid)
 DL_GroupParameters_EC (const EllipticCurve &ec, const Point &G, const Integer &n, const Integer &k=Integer::Zero())
 DL_GroupParameters_EC (BufferedTransformation &bt)
void Initialize (const EllipticCurve &ec, const Point &G, const Integer &n, const Integer &k=Integer::Zero())
void Initialize (const OID &oid)
bool GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
 to be implemented by derived classes, users should use one of the above functions instead
void AssignFrom (const NameValuePairs &source)
 assign values from source to this object
void GenerateRandom (RandomNumberGenerator &rng, const NameValuePairs &alg)
 this implementation doesn't actually generate a curve, it just initializes the parameters with existing values
const DL_FixedBasePrecomputation<
Element > & 
GetBasePrecomputation () const
DL_FixedBasePrecomputation<
Element > & 
AccessBasePrecomputation ()
const IntegerGetSubgroupOrder () const
Integer GetCofactor () const
bool ValidateGroup (RandomNumberGenerator &rng, unsigned int level) const
bool ValidateElement (unsigned int level, const Element &element, const DL_FixedBasePrecomputation< Element > *precomp) const
bool FastSubgroupCheckAvailable () const
void EncodeElement (bool reversible, const Element &element, byte *encoded) const
unsigned int GetEncodedElementSize (bool reversible) const
Element DecodeElement (const byte *encoded, bool checkForGroupMembership) const
Integer ConvertElementToInteger (const Element &element) const
Integer GetMaxExponent () const
bool IsIdentity (const Element &element) const
void SimultaneousExponentiate (Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const
OID GetAlgorithmID () const
Element MultiplyElements (const Element &a, const Element &b) const
Element CascadeExponentiate (const Element &element1, const Integer &exponent1, const Element &element2, const Integer &exponent2) const
void BERDecode (BufferedTransformation &bt)
void DEREncode (BufferedTransformation &bt) const
void SetPointCompression (bool compress)
bool GetPointCompression () const
void SetEncodeAsOID (bool encodeAsOID)
bool GetEncodeAsOID () const
const EllipticCurveGetCurve () const
bool operator== (const ThisClass &rhs) const
const DL_GroupPrecomputation<
Element > & 
GetGroupPrecomputation () const
bool Validate (RandomNumberGenerator &rng, unsigned int level) const
 check this object for errors
bool SupportsPrecomputation () const
 
Returns:
whether this object supports precomputation

void Precompute (unsigned int precomputationStorage=16)
 do precomputation
void LoadPrecomputation (BufferedTransformation &storedPrecomputation)
 retrieve previously saved precomputation
void SavePrecomputation (BufferedTransformation &storedPrecomputation) const
 save precomputation for later use
virtual const ElementGetSubgroupGenerator () const
virtual void SetSubgroupGenerator (const Element &base)
virtual Element ExponentiateBase (const Integer &exponent) const
virtual Element ExponentiateElement (const Element &base, const Integer &exponent) const
virtual Integer GetGroupOrder () const
virtual void EncodeElement (bool reversible, const Element &element, byte *encoded) const =0
virtual Integer ConvertElementToInteger (const Element &element) const =0
virtual bool ValidateElement (unsigned int level, const Element &element, const DL_FixedBasePrecomputation< Element > *precomp) const =0
virtual bool IsIdentity (const Element &element) const =0
virtual void SimultaneousExponentiate (Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const =0

Static Public Member Functions

static std::string __cdecl StaticAlgorithmNamePrefix ()
static OID __cdecl GetNextRecommendedParametersOID (const OID &oid)

Protected Member Functions

unsigned int FieldElementLength () const
unsigned int ExponentLength () const
void ParametersChanged ()

Protected Attributes

OID m_oid
Integer m_n
bool m_compress
bool m_encodeAsOID
Integer m_k
EcPrecomputation< EC > m_groupPrecomputation
DL_FixedBasePrecomputationImpl<
typenameEcPrecomputation<
EC >::Element
m_gpc


Member Function Documentation

template<class EC>
void DL_GroupParameters_EC< EC >::AssignFrom ( const NameValuePairs source  )  [virtual]

assign values from source to this object

Note:
This function can be used to create a public key from a private key.

Implements CryptoMaterial.

Definition at line 414 of file eccrypto.cpp.

References Name::Cofactor(), Name::Curve(), NameValuePairs::GetRequiredParameter(), NameValuePairs::GetValue(), NameValuePairs::GetValueWithDefault(), Name::GroupOID(), DL_GroupParameters_EC< EC >::Initialize(), Name::SubgroupGenerator(), Name::SubgroupOrder(), and Integer::Zero().

Referenced by DL_GroupParameters_EC< EC >::GenerateRandom().

template<class EC>
void DL_GroupParameters_EC< EC >::GenerateRandom ( RandomNumberGenerator rng,
const NameValuePairs alg 
) [virtual]

this implementation doesn't actually generate a curve, it just initializes the parameters with existing values

parameters: (Curve, SubgroupGenerator, SubgroupOrder, Cofactor (optional)), or (GroupOID)

Reimplemented from GeneratableCryptoMaterial.

Definition at line 435 of file eccrypto.cpp.

References DL_GroupParameters_EC< EC >::AssignFrom().

bool DL_GroupParameters< typenameEcPrecomputation< EC >::Element >::Validate ( RandomNumberGenerator rng,
unsigned int  level 
) const [inline, virtual, inherited]

check this object for errors

Parameters:
level denotes the level of thoroughness: 0 - using this object won't cause a crash or exception (rng is ignored) 1 - this object will probably function (encrypt, sign, etc.) correctly (but may not check for weak keys and such) 2 - make sure this object will function correctly, and do reasonable security checks 3 - do checks that may take a long time
Returns:
true if the tests pass

Implements CryptoMaterial.

Definition at line 531 of file pubkey.h.

void DL_GroupParameters< typenameEcPrecomputation< EC >::Element >::Precompute ( unsigned int  precomputationStorage = 16  )  [inline, virtual, inherited]

do precomputation

The exact semantics of Precompute() is varies, but typically it means calculate a table of n objects that can be used later to speed up computation.

Reimplemented from CryptoMaterial.

Definition at line 557 of file pubkey.h.


The documentation for this class was generated from the following files:
Generated on Sat Dec 23 02:07:20 2006 for Crypto++ by  doxygen 1.5.1-p1