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DL_GroupParameters_EC< EC > Class Template Reference

#include <eccrypto.h>

Inheritance diagram for DL_GroupParameters_EC< EC >:

DL_GroupParametersImpl< EcPrecomputation< EC > > DL_GroupParameters< T > 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<
typename EcPrecomputation<
EC >::Element > 
BasePrecomputation

Public Member Functions

 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 EllipticCurve & GetCurve () const
const DL_GroupPrecomputation<
Element > & 
GetGroupPrecomputation () const
bool Validate (RandomNumberGenerator &rng, unsigned int level) const
 check this object for errors

bool SupportsPrecomputation () const
 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 Element & GetSubgroupGenerator () 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
void GenerateRandomWithKeySize (RandomNumberGenerator &rng, unsigned int keySize)
 calls the above function with a NameValuePairs object that just specifies "KeySize"

virtual void ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
 throws InvalidMaterial if this object fails Validate() test

virtual void Save (BufferedTransformation &bt) const
 save key into a BufferedTransformation

virtual void Load (BufferedTransformation &bt)
 load key from a BufferedTransformation

void DoQuickSanityCheck () const
template<class T> bool GetThisObject (T &object) const
 get a copy of this object or a subobject of it

template<class T> bool GetThisPointer (T *&p) const
 get a pointer to this object, as a pointer to T

template<class T> bool GetValue (const char *name, T &value) const
 get a named value, returns true if the name exists

template<class T> T GetValueWithDefault (const char *name, T defaultValue) const
 get a named value, returns the default if the name doesn't exist

std::string GetValueNames () const
 get a list of value names that can be retrieved

bool GetIntValue (const char *name, int &value) const
 get a named value with type int

int GetIntValueWithDefault (const char *name, int defaultValue) const
 get a named value with type int, with default

template<class T> void GetRequiredParameter (const char *className, const char *name, T &value) const
void GetRequiredIntParameter (const char *className, const char *name, int &value) const

Static Public Member Functions

OID GetNextRecommendedParametersOID (const OID &oid)
void ThrowIfTypeMismatch (const char *name, const std::type_info &stored, const std::type_info &retrieving)
 used by derived classes to check for type mismatch


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<
typename EcPrecomputation<
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 403 of file eccrypto.cpp.

References NameValuePairs::GetRequiredParameter(), NameValuePairs::GetValue(), and NameValuePairs::GetValueWithDefault().

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 424 of file eccrypto.cpp.

References DL_GroupParameters_EC< EC >::AssignFrom().

template<class T>
bool DL_GroupParameters< T >::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 559 of file pubkey.h.

template<class T>
void DL_GroupParameters< T >::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 585 of file pubkey.h.

virtual void CryptoMaterial::Load BufferedTransformation bt  )  [inline, virtual, inherited]
 

load key from a BufferedTransformation

Exceptions:
KeyingErr if decode fails
Note:
Generally does not check that the key is valid. Call ValidateKey() or ThrowIfInvalidKey() to check that.

Reimplemented in ASN1CryptoMaterial.

Definition at line 966 of file cryptlib.h.

Referenced by AsymmetricAlgorithm::BERDecode().

bool NameValuePairs::GetIntValue const char *  name,
int &  value
const [inline, inherited]
 

get a named value with type int

used to ensure we don't accidentally try to get an unsigned int or some other type when we mean int (which is the most common case)

Definition at line 258 of file cryptlib.h.

References NameValuePairs::GetValue().

Referenced by InvertibleRWFunction::GenerateRandom(), InvertibleRSAFunction::GenerateRandom(), InvertibleRabinFunction::GenerateRandom(), InvertibleLUCFunction::GenerateRandom(), DL_GroupParameters_IntegerBased::GenerateRandom(), DL_GroupParameters_DSA::GenerateRandom(), and InvertibleESIGNFunction::GenerateRandom().


The documentation for this class was generated from the following files:
Generated on Sun Mar 14 20:44:34 2004 for Crypto++ by doxygen 1.3.6-20040222