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RabinFunction Class Reference

Rabin trapdoor function using the public key. More...

#include <rabin.h>

Inheritance diagram for RabinFunction:
TrapdoorFunction PublicKey RandomizedTrapdoorFunction CryptoMaterial TrapdoorFunctionBounds NameValuePairs InvertibleRabinFunction

Public Member Functions

void Initialize (const Integer &n, const Integer &r, const Integer &s)
 Initialize a Rabin public key.
 
void BERDecode (BufferedTransformation &bt)
 
void DEREncode (BufferedTransformation &bt) const
 
Integer ApplyFunction (const Integer &x) const
 Applies the trapdoor.
 
Integer PreimageBound () const
 Returns the maximum size of a message before the trapdoor function is applied.
 
Integer ImageBound () const
 Returns the maximum size of a representation after the trapdoor function is applied.
 
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
 Get a named value.
 
void AssignFrom (const NameValuePairs &source)
 Assign values to this object.
 
const IntegerGetModulus () const
 
const IntegerGetQuadraticResidueModPrime1 () const
 
const IntegerGetQuadraticResidueModPrime2 () const
 
void SetModulus (const Integer &n)
 
void SetQuadraticResidueModPrime1 (const Integer &r)
 
void SetQuadraticResidueModPrime2 (const Integer &s)
 
- Public Member Functions inherited from TrapdoorFunction
Integer ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const
 Applies the trapdoor function.
 
bool IsRandomized () const
 Determines if the encryption algorithm is randomized.
 
- Public Member Functions inherited from TrapdoorFunctionBounds
virtual Integer MaxPreimage () const
 Returns the maximum size of a message before the trapdoor function is applied bound to a public key.
 
virtual Integer MaxImage () const
 Returns the maximum size of a representation after the trapdoor function is applied bound to a public key.
 
- Public Member Functions inherited from CryptoMaterial
virtual void ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
 Check this object for errors.
 
virtual void Save (BufferedTransformation &bt) const
 Saves a key to a BufferedTransformation.
 
virtual void Load (BufferedTransformation &bt)
 Loads a key from a BufferedTransformation.
 
virtual bool SupportsPrecomputation () const
 Determines whether the object supports precomputation.
 
virtual void Precompute (unsigned int precomputationStorage)
 Perform precomputation.
 
virtual void LoadPrecomputation (BufferedTransformation &storedPrecomputation)
 Retrieve previously saved precomputation.
 
virtual void SavePrecomputation (BufferedTransformation &storedPrecomputation) const
 Save precomputation for later use.
 
void DoQuickSanityCheck () const
 Perform a quick sanity check.
 
- Public Member Functions inherited from NameValuePairs
template<class T >
bool GetThisObject (T &object) const
 Get a copy of this object or subobject.
 
template<class T >
bool GetThisPointer (T *&ptr) const
 Get a pointer to this object.
 
template<class T >
bool GetValue (const char *name, T &value) const
 Get a named value.
 
template<class T >
GetValueWithDefault (const char *name, T defaultValue) const
 Get a named value.
 
CRYPTOPP_DLL std::string GetValueNames () const
 Get a list of value names that can be retrieved.
 
CRYPTOPP_DLL bool GetIntValue (const char *name, int &value) const
 Get a named value with type int.
 
CRYPTOPP_DLL int GetIntValueWithDefault (const char *name, int defaultValue) const
 Get a named value with type int, with default.
 
CRYPTOPP_DLL bool GetWord64Value (const char *name, word64 &value) const
 Get a named value with type word64.
 
CRYPTOPP_DLL word64 GetWord64ValueWithDefault (const char *name, word64 defaultValue) const
 Get a named value with type word64, with default.
 
template<class T >
void GetRequiredParameter (const char *className, const char *name, T &value) const
 Retrieves a required name/value pair.
 
CRYPTOPP_DLL void GetRequiredIntParameter (const char *className, const char *name, int &value) const
 Retrieves a required name/value pair.
 

Protected Attributes

Integer m_n
 
Integer m_r
 
Integer m_s
 

Additional Inherited Members

- Static Public Member Functions inherited from NameValuePairs
static CRYPTOPP_DLL void CRYPTOPP_API ThrowIfTypeMismatch (const char *name, const std::type_info &stored, const std::type_info &retrieving)
 Ensures an expected name and type is present.
 

Detailed Description

Rabin trapdoor function using the public key.

Since
Crypto++ 2.0

Definition at line 18 of file rabin.h.

Member Function Documentation

◆ ApplyFunction()

Integer RabinFunction::ApplyFunction ( const Integer x) const
virtual

Applies the trapdoor.

Parameters
xthe message on which the encryption function is applied
Returns
the message x encrypted under the public key

ApplyFunction is a generalization of encryption under a public key cryptosystem. Derived classes must implement it.

Implements TrapdoorFunction.

Definition at line 31 of file rabin.cpp.

◆ AssignFrom()

void RabinFunction::AssignFrom ( const NameValuePairs source)
virtual

Assign values to this object.

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

Implements CryptoMaterial.

Definition at line 69 of file rabin.cpp.

◆ BERDecode()

void RabinFunction::BERDecode ( BufferedTransformation bt)

Definition at line 13 of file rabin.cpp.

◆ DEREncode()

void RabinFunction::DEREncode ( BufferedTransformation bt) const

Definition at line 22 of file rabin.cpp.

◆ GetModulus()

const Integer & RabinFunction::GetModulus ( ) const
inline

Definition at line 42 of file rabin.h.

◆ GetQuadraticResidueModPrime1()

const Integer & RabinFunction::GetQuadraticResidueModPrime1 ( ) const
inline

Definition at line 43 of file rabin.h.

◆ GetQuadraticResidueModPrime2()

const Integer & RabinFunction::GetQuadraticResidueModPrime2 ( ) const
inline

Definition at line 44 of file rabin.h.

◆ GetVoidValue()

bool RabinFunction::GetVoidValue ( const char *  name,
const std::type_info &  valueType,
void *  pValue 
) const
virtual

Get a named value.

Parameters
namethe name of the object or value to retrieve
valueTypereference to a variable that receives the value
pValuevoid pointer to a variable that receives the value
Returns
true if the value was retrieved, false otherwise

GetVoidValue() retrieves the value of name if it exists.

Note
GetVoidValue() is an internal function and should be implemented by derived classes. Users should use one of the other functions instead.
See also
GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(), GetRequiredParameter() and GetRequiredIntParameter()

Implements NameValuePairs.

Definition at line 60 of file rabin.cpp.

◆ ImageBound()

Integer RabinFunction::ImageBound ( ) const
inlinevirtual

Returns the maximum size of a representation after the trapdoor function is applied.

Returns
the maximum size of a representation after the trapdoor function is applied

Derived classes must implement ImageBound().

Implements TrapdoorFunctionBounds.

Definition at line 36 of file rabin.h.

◆ Initialize()

void RabinFunction::Initialize ( const Integer n,
const Integer r,
const Integer s 
)
inline

Initialize a Rabin public key.

Parameters
nthe modulus
relement r
selement s

Definition at line 28 of file rabin.h.

◆ PreimageBound()

Integer RabinFunction::PreimageBound ( ) const
inlinevirtual

Returns the maximum size of a message before the trapdoor function is applied.

Returns
the maximum size of a message before the trapdoor function is applied

Derived classes must implement PreimageBound().

Implements TrapdoorFunctionBounds.

Definition at line 35 of file rabin.h.

◆ SetModulus()

void RabinFunction::SetModulus ( const Integer n)
inline

Definition at line 46 of file rabin.h.

◆ SetQuadraticResidueModPrime1()

void RabinFunction::SetQuadraticResidueModPrime1 ( const Integer r)
inline

Definition at line 47 of file rabin.h.

◆ SetQuadraticResidueModPrime2()

void RabinFunction::SetQuadraticResidueModPrime2 ( const Integer s)
inline

Definition at line 48 of file rabin.h.

◆ Validate()

bool RabinFunction::Validate ( RandomNumberGenerator rng,
unsigned int  level 
) const
virtual

Check this object for errors.

Parameters
rnga RandomNumberGenerator for objects which use randomized testing
levelthe level of thoroughness
Returns
true if the tests succeed, false otherwise

There are four levels of thoroughness:

  • 0 - using this object won't cause a crash or exception
  • 1 - this object will probably function, and encrypt, sign, other operations correctly
  • 2 - ensure this object will function correctly, and perform reasonable security checks
  • 3 - perform reasonable security checks, and do checks that may take a long time

Level 0 does not require a RandomNumberGenerator. A NullRNG() can be used for level 0. Level 1 may not check for weak keys and such. Levels 2 and 3 are recommended.

See also
ThrowIfInvalid()

Implements CryptoMaterial.

Definition at line 43 of file rabin.cpp.

Member Data Documentation

◆ m_n

Integer RabinFunction::m_n
protected

Definition at line 51 of file rabin.h.

◆ m_r

Integer RabinFunction::m_r
protected

Definition at line 51 of file rabin.h.

◆ m_s

Integer RabinFunction::m_s
protected

Definition at line 51 of file rabin.h.


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