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DL_GroupParameters< T > Class Template Reference

#include <pubkey.h>

Inheritance diagram for DL_GroupParameters< T >:

CryptoParameters GeneratableCryptoMaterial CryptoMaterial NameValuePairs List of all members.

Detailed Description

template<class T>
class DL_GroupParameters< T >

interface for DL group parameters

Definition at line 541 of file pubkey.h.

Public Types

typedef T Element

Public Member Functions

bool Validate (RandomNumberGenerator &rng, unsigned int level) const
 check this object for errors
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
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 const DL_GroupPrecomputation<
Element > & 
GetGroupPrecomputation () const =0
virtual const DL_FixedBasePrecomputation<
Element > & 
GetBasePrecomputation () const =0
virtual DL_FixedBasePrecomputation<
Element > & 
AccessBasePrecomputation ()=0
virtual const IntegerGetSubgroupOrder () const =0
virtual Integer GetMaxExponent () const =0
virtual Integer GetGroupOrder () const
virtual Integer GetCofactor () const
virtual unsigned int GetEncodedElementSize (bool reversible) const =0
virtual void EncodeElement (bool reversible, const Element &element, byte *encoded) const =0
virtual Element DecodeElement (const byte *encoded, bool checkForGroupMembership) const =0
virtual Integer ConvertElementToInteger (const Element &element) const =0
virtual bool ValidateGroup (RandomNumberGenerator &rng, unsigned int level) const =0
virtual bool ValidateElement (unsigned int level, const Element &element, const DL_FixedBasePrecomputation< Element > *precomp) const =0
virtual bool FastSubgroupCheckAvailable () 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
virtual void GenerateRandom (RandomNumberGenerator &rng, const NameValuePairs &params=g_nullNameValuePairs)
 generate a random key or crypto parameters
void GenerateRandomWithKeySize (RandomNumberGenerator &rng, unsigned int keySize)
 calls the above function with a NameValuePairs object that just specifies "KeySize"
virtual void AssignFrom (const NameValuePairs &source)=0
 assign values from source to this object
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

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

void ParametersChanged ()

Member Function Documentation

template<class T>
bool DL_GroupParameters< T >::Validate RandomNumberGenerator rng,
unsigned int  level
const [inline, virtual]

check this object for errors

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
true if the tests pass

Implements CryptoMaterial.

Definition at line 551 of file pubkey.h.

template<class T>
void DL_GroupParameters< T >::Precompute unsigned int  precomputationStorage = 16  )  [inline, virtual]

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 577 of file pubkey.h.

virtual void GeneratableCryptoMaterial::GenerateRandom RandomNumberGenerator rng,
const NameValuePairs params = g_nullNameValuePairs
[inline, virtual, inherited]

generate a random key or crypto parameters

KeyingErr if algorithm parameters are invalid, or if a key can't be generated (e.g., if this is a public key object)

Reimplemented in DL_GroupParameters_EC< EC >, InvertibleESIGNFunction, DL_GroupParameters_IntegerBased, DL_GroupParameters_DSA, InvertibleLUCFunction, DL_PrivateKeyImpl< GP >, InvertibleRabinFunction, InvertibleRSAFunction, InvertibleRWFunction, and DL_PrivateKeyImpl< DL_GroupParameters_EC< EC > >.

Definition at line 1024 of file cryptlib.h.

Referenced by GeneratableCryptoMaterial::GenerateRandomWithKeySize().

virtual void CryptoMaterial::AssignFrom const NameValuePairs source  )  [pure virtual, inherited]

assign values from source to this object

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

Implemented in DL_GroupParameters_EC< EC >, ESIGNFunction, InvertibleESIGNFunction, DL_GroupParameters_IntegerBased, DL_GroupParameters_IntegerBasedImpl< GROUP_PRECOMP, BASE_PRECOMP >, LUCFunction, InvertibleLUCFunction, RabinFunction, InvertibleRabinFunction, RSAFunction, InvertibleRSAFunction, RWFunction, InvertibleRWFunction, XTR_DH, DL_GroupParameters_IntegerBasedImpl< DL_GroupPrecomputation_LUC, DL_BasePrecomputation_LUC >, and DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation >.

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

load key from a BufferedTransformation

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

Reimplemented in ASN1CryptoMaterial.

Definition at line 994 of file cryptlib.h.

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 278 of file cryptlib.h.

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 file:
Generated on Wed Jul 21 19:15:46 2004 for Crypto++ by doxygen 1.3.7-20040704