Public Member Functions | Static Public Member Functions | Protected Attributes

LUCFunction Class Reference

The LUC function. More...

#include <luc.h>

Inheritance diagram for LUCFunction:
TrapdoorFunction PublicKey RandomizedTrapdoorFunction CryptoMaterial TrapdoorFunctionBounds NameValuePairs InvertibleLUCFunction

List of all members.

Public Member Functions

void Initialize (const Integer &n, const Integer &e)
void BERDecode (BufferedTransformation &bt)
void DEREncode (BufferedTransformation &bt) const
Integer ApplyFunction (const Integer &x) const
Integer PreimageBound () const
Integer ImageBound () const
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
void AssignFrom (const NameValuePairs &source)
 assign values from source to this object
const IntegerGetModulus () const
const IntegerGetPublicExponent () const
void SetModulus (const Integer &n)
void SetPublicExponent (const Integer &e)
Integer ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const
bool IsRandomized () const
virtual Integer ApplyFunction (const Integer &x) const =0
virtual Integer PreimageBound () const =0
virtual Integer ImageBound () const =0
virtual Integer MaxPreimage () const
virtual Integer MaxImage () const
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
virtual bool SupportsPrecomputation () const
virtual void Precompute (unsigned int n)
 do precomputation
virtual void LoadPrecomputation (BufferedTransformation &storedPrecomputation)
 retrieve previously saved precomputation
virtual void SavePrecomputation (BufferedTransformation &storedPrecomputation) const
 save precomputation for later use
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

Static Public Member Functions

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 Attributes

Integer m_n
Integer m_e

Detailed Description

The LUC function.

This class is here for historical and pedagogical interest. It has no practical advantages over other trapdoor functions and probably shouldn't be used in production software. The discrete log based LUC schemes defined later in this .h file may be of more practical interest.

Definition at line 22 of file luc.h.

Member Function Documentation

bool LUCFunction::Validate ( RandomNumberGenerator rng,
unsigned int  level 
) const [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 69 of file luc.cpp.

References Integer::One().

void LUCFunction::AssignFrom ( const NameValuePairs source  )  [virtual]

assign values from source to this object

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

Implements CryptoMaterial.

Definition at line 85 of file luc.cpp.

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 InvertibleRSAFunction.

Definition at line 1072 of file cryptlib.h.

virtual bool CryptoMaterial::SupportsPrecomputation (  )  const [inline, virtual, inherited]
virtual void CryptoMaterial::Precompute ( unsigned int  n  )  [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 in DL_GroupParameters< T >, DL_PrivateKeyImpl< GP >, DL_PublicKeyImpl< GP >, DL_GroupParameters< Integer >, DL_GroupParameters< typenameEcPrecomputation< EC >::Element >, DL_PrivateKeyImpl< DL_GroupParameters_EC< EC > >, and DL_PublicKeyImpl< DL_GroupParameters_EC< EC > >.

Definition at line 1081 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().

The documentation for this class was generated from the following files: