Main Page | Namespace List | Class Hierarchy | Alphabetical List | Class List | File List | Namespace Members | Class Members | File Members

DL_GroupParameters_DSA Class Reference

#include <gfpcrypt.h>

Inheritance diagram for DL_GroupParameters_DSA:

DL_GroupParameters_GFP DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation > DL_GroupParametersImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typenameModExpPrecomputation::Element >, DL_GroupParameters_IntegerBased > DL_GroupParameters_IntegerBased DL_GroupParameters< Integer > ASN1CryptoMaterial CryptoParameters ASN1Object CryptoMaterial GeneratableCryptoMaterial NameValuePairs CryptoMaterial NameValuePairs List of all members.

Detailed Description

DSA group parameters, these are GF(p) group parameters that are allowed by the DSA standard.

Definition at line 364 of file gfpcrypt.h.

Public Types

typedef ModExpPrecomputation::Element Element
typedef ModExpPrecomputation GroupPrecomputation
typedef DL_FixedBasePrecomputationImpl<
typenameModExpPrecomputation::Element > 
BasePrecomputation

Public Member Functions

bool ValidateGroup (RandomNumberGenerator &rng, unsigned int level) const
void GenerateRandom (RandomNumberGenerator &rng, const NameValuePairs &alg)
bool IsIdentity (const Integer &element) const
virtual bool IsIdentity (const Element &element) const =0
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
 to be implemented by derived classes, users should use one of the above functions instead
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 AssignFrom (const NameValuePairs &source)
 assign values from source to this object
const DL_FixedBasePrecomputation<
Element > & 
GetBasePrecomputation () const
DL_FixedBasePrecomputation<
Element > & 
AccessBasePrecomputation ()
const IntegerGetModulus () const
const IntegerGetGenerator () const
void SetModulusAndSubgroupGenerator (const Integer &p, const Integer &g)
bool operator== (const DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typenameModExpPrecomputation::Element > > &rhs) const
bool operator!= (const DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation, DL_FixedBasePrecomputationImpl< typenameModExpPrecomputation::Element > > &rhs) const
const DL_GroupPrecomputation<
Element > & 
GetGroupPrecomputation () const
void Initialize (const DL_GroupParameters_IntegerBased &params)
void Initialize (RandomNumberGenerator &rng, unsigned int pbits)
void Initialize (const Integer &p, const Integer &g)
void Initialize (const Integer &p, const Integer &q, const Integer &g)
void BERDecode (BufferedTransformation &bt)
 decode this object from a BufferedTransformation, using BER (Basic Encoding Rules)
void DEREncode (BufferedTransformation &bt) const
 encode this object into a BufferedTransformation, using DER (Distinguished Encoding Rules)
const IntegerGetSubgroupOrder () const
Integer GetGroupOrder () const
bool ValidateElement (unsigned int level, const Integer &element, const DL_FixedBasePrecomputation< Integer > *precomp) const
virtual bool ValidateElement (unsigned int level, const Element &element, const DL_FixedBasePrecomputation< Element > *precomp) const =0
bool FastSubgroupCheckAvailable () const
void EncodeElement (bool reversible, const Element &element, byte *encoded) const
unsigned int GetEncodedElementSize (bool reversible) const
Integer DecodeElement (const byte *encoded, bool checkForGroupMembership) const
Integer ConvertElementToInteger (const Element &element) const
Integer GetMaxExponent () const
OID GetAlgorithmID () const
void SetSubgroupOrder (const Integer &q)
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 GetCofactor () 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
void Save (BufferedTransformation &bt) const
 save key into a BufferedTransformation
virtual void Load (BufferedTransformation &bt)
 load key from a BufferedTransformation
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>
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
virtual void BEREncode (BufferedTransformation &bt) const
 encode this object into a BufferedTransformation, using BER

Static Public Member Functions

std::string StaticAlgorithmNamePrefix ()
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

int GetFieldType () const
Integer ComputeGroupOrder (const Integer &modulus) const
virtual unsigned int GetDefaultSubgroupOrderSize (unsigned int modulusSize) const
void ParametersChanged ()

Protected Attributes

ModExpPrecomputation m_groupPrecomputation
DL_FixedBasePrecomputationImpl<
typenameModExpPrecomputation::Element > 
m_gpc


Member Function Documentation

bool DL_GroupParameters_DSA::ValidateGroup RandomNumberGenerator rng,
unsigned int  level
const [virtual]
 

also checks that the lengths of p and q are allowed by the DSA standard

Reimplemented from DL_GroupParameters_IntegerBased.

Definition at line 61 of file gfpcrypt.cpp.

References Integer::BitCount().

void DL_GroupParameters_DSA::GenerateRandom RandomNumberGenerator rng,
const NameValuePairs alg
[virtual]
 

ModulusSize must be between DSA::MIN_PRIME_LENGTH and DSA::MAX_PRIME_LENGTH, and divisible by DSA::PRIME_LENGTH_MULTIPLE

Reimplemented from DL_GroupParameters_IntegerBased.

Definition at line 26 of file gfpcrypt.cpp.

References RandomNumberGenerator::GenerateBlock(), DSA::GeneratePrimes(), NameValuePairs::GetIntValue(), NameValuePairs::GetValue(), NameValuePairs::GetValueWithDefault(), and Integer::Randomize().

void DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation , DL_FixedBasePrecomputationImpl< typename ModExpPrecomputation ::Element> >::AssignFrom const NameValuePairs source  )  [inline, virtual, inherited]
 

assign values from source to this object

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

Reimplemented from DL_GroupParameters_IntegerBased.

Definition at line 95 of file gfpcrypt.h.

bool DL_GroupParameters< Integer >::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 551 of file pubkey.h.

void DL_GroupParameters< Integer >::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 577 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 999 of file cryptlib.h.

void ASN1CryptoMaterial::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 from CryptoMaterial.

Definition at line 52 of file simple.h.

References ASN1Object::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 283 of file cryptlib.h.

References NameValuePairs::GetValue().

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

virtual void ASN1Object::BEREncode BufferedTransformation bt  )  const [inline, virtual, inherited]
 

encode this object into a BufferedTransformation, using BER

this may be useful if DEREncode() would be too inefficient

Definition at line 1566 of file cryptlib.h.

References ASN1Object::DEREncode().

Referenced by ASN1CryptoMaterial::Save().


The documentation for this class was generated from the following files:
Generated on Tue Oct 26 18:51:44 2004 for Crypto++ by  doxygen 1.3.9.1