Elliptic Curve Parameters. More...
#include <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 (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 Integer & | GetSubgroupOrder () 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 |
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 |
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 |
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 |
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 | |
static std::string | StaticAlgorithmNamePrefix () |
static OID | GetNextRecommendedParametersOID (const OID &oid) |
static 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 < typenameEcPrecomputation< EC > ::Element > | m_gpc |
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.
void DL_GroupParameters_EC< EC >::AssignFrom | ( | const NameValuePairs & | source | ) | [virtual] |
assign values from source to this object
Implements CryptoMaterial.
Definition at line 464 of file eccrypto.cpp.
References Name::Cofactor(), Name::Curve(), NameValuePairs::GetValue(), NameValuePairs::GetValueWithDefault(), Name::GroupOID(), Name::SubgroupGenerator(), Name::SubgroupOrder(), and Integer::Zero().
Referenced by DL_GroupParameters_EC< EC >::GenerateRandom().
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 485 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
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 |
Implements CryptoMaterial.
bool DL_GroupParameters< typenameEcPrecomputation< EC >::Element >::SupportsPrecomputation | ( | ) | const [inline, virtual, inherited] |
Reimplemented from CryptoMaterial.
void DL_GroupParameters< typenameEcPrecomputation< EC >::Element >::Precompute | ( | unsigned int | n = 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.
virtual void CryptoMaterial::Load | ( | BufferedTransformation & | bt | ) | [inline, virtual, inherited] |
load key from a BufferedTransformation
KeyingErr | if decode fails |
Reimplemented in InvertibleRSAFunction.
Definition at line 1072 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 282 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().