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ESIGNFunction Class Reference

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

#include <esign.h>

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Public Member Functions

void Initialize (const Integer &n, const Integer &e)
 Initialize a ESIGN public key with {n,e}. More...
 
void BERDecode (BufferedTransformation &bt)
 Decode this object from a BufferedTransformation. More...
 
void DEREncode (BufferedTransformation &bt) const
 Encode this object into a BufferedTransformation. More...
 
bool Validate (RandomNumberGenerator &rng, unsigned int level) const
 Check this object for errors. More...
 
bool GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
 Get a named value. More...
 
void AssignFrom (const NameValuePairs &source)
 Assign values to this object. More...
 
Integer ApplyFunction (const Integer &x) const
 Applies the trapdoor. More...
 
Integer PreimageBound () const
 Returns the maximum size of a message before the trapdoor function is applied. More...
 
Integer ImageBound () const
 Returns the maximum size of a message after the trapdoor function is applied. More...
 
const IntegerGetModulus () const
 
const IntegerGetPublicExponent () const
 
void SetModulus (const Integer &n)
 
void SetPublicExponent (const Integer &e)
 
- Public Member Functions inherited from TrapdoorFunction
virtual ~TrapdoorFunction ()
 
Integer ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const
 Applies the trapdoor function. More...
 
bool IsRandomized () const
 Determines if the encryption algorithm is randomized. More...
 
- Public Member Functions inherited from RandomizedTrapdoorFunction
virtual ~RandomizedTrapdoorFunction ()
 
- Public Member Functions inherited from TrapdoorFunctionBounds
virtual ~TrapdoorFunctionBounds ()
 
virtual Integer MaxPreimage () const
 Returns the maximum size of a message before the trapdoor function is applied bound to a public key. More...
 
virtual Integer MaxImage () const
 Returns the maximum size of a message after the trapdoor function is applied bound to a public key. More...
 
- Public Member Functions inherited from ASN1CryptoMaterial< PublicKey >
void Save (BufferedTransformation &bt) const
 DER encode ASN.1 object. More...
 
void Load (BufferedTransformation &bt)
 BER decode ASN.1 object. More...
 
- Public Member Functions inherited from ASN1Object
virtual ~ASN1Object ()
 
virtual void BEREncode (BufferedTransformation &bt) const
 Encode this object into a BufferedTransformation. More...
 
- Public Member Functions inherited from CryptoMaterial
virtual ~CryptoMaterial ()
 
virtual void ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
 Check this object for errors. More...
 
virtual bool SupportsPrecomputation () const
 Determines whether the object supports precomputation. More...
 
virtual void Precompute (unsigned int precomputationStorage)
 Perform precomputation. More...
 
virtual void LoadPrecomputation (BufferedTransformation &storedPrecomputation)
 Retrieve previously saved precomputation. More...
 
virtual void SavePrecomputation (BufferedTransformation &storedPrecomputation) const
 Save precomputation for later use. More...
 
void DoQuickSanityCheck () const
 Perform a quick sanity check. More...
 
- Public Member Functions inherited from NameValuePairs
virtual ~NameValuePairs ()
 
template<class T >
bool GetThisObject (T &object) const
 Get a copy of this object or subobject. More...
 
template<class T >
bool GetThisPointer (T *&ptr) const
 Get a pointer to this object. More...
 
template<class T >
bool GetValue (const char *name, T &value) const
 Get a named value. More...
 
template<class T >
T GetValueWithDefault (const char *name, T defaultValue) const
 Get a named value. More...
 
CRYPTOPP_DLL std::string GetValueNames () const
 Get a list of value names that can be retrieved. More...
 
CRYPTOPP_DLL bool GetIntValue (const char *name, int &value) const
 Get a named value with type int. More...
 
CRYPTOPP_DLL int GetIntValueWithDefault (const char *name, int defaultValue) const
 Get a named value with type int, with default. More...
 
template<class T >
void GetRequiredParameter (const char *className, const char *name, T &value) const
 Retrieves a required name/value pair. More...
 
CRYPTOPP_DLL void GetRequiredIntParameter (const char *className, const char *name, int &value) const
 Retrieves a required name/value pair. More...
 

Protected Member Functions

unsigned int GetK () const
 

Protected Attributes

Integer m_n
 
Integer m_e
 

Private Types

typedef ESIGNFunction ThisClass
 

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. More...
 

Detailed Description

ESIGN trapdoor function using the public key.

Since
Crypto++ 5.0

Definition at line 21 of file esign.h.

Member Typedef Documentation

Definition at line 23 of file esign.h.

Member Function Documentation

Integer ESIGNFunction::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 53 of file esign.cpp.

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void ESIGNFunction::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.

Reimplemented in InvertibleESIGNFunction.

Definition at line 76 of file esign.cpp.

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void ESIGNFunction::BERDecode ( BufferedTransformation bt)
virtual

Decode this object from a BufferedTransformation.

Parameters
btBufferedTransformation object

Uses Basic Encoding Rules (BER)

Implements ASN1Object.

Reimplemented in InvertibleESIGNFunction.

Definition at line 37 of file esign.cpp.

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void ESIGNFunction::DEREncode ( BufferedTransformation bt) const
virtual

Encode this object into a BufferedTransformation.

Parameters
btBufferedTransformation object

Uses Distinguished Encoding Rules (DER)

Implements ASN1Object.

Reimplemented in InvertibleESIGNFunction.

Definition at line 45 of file esign.cpp.

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unsigned int ESIGNFunction::GetK ( ) const
inlineprotected

Definition at line 56 of file esign.h.

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const Integer& ESIGNFunction::GetModulus ( ) const
inline

Definition at line 48 of file esign.h.

const Integer& ESIGNFunction::GetPublicExponent ( ) const
inline

Definition at line 49 of file esign.h.

bool ESIGNFunction::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.

Reimplemented in InvertibleESIGNFunction.

Definition at line 68 of file esign.cpp.

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Integer ESIGNFunction::ImageBound ( ) const
inlinevirtual

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

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

Derived classes must implement ImageBound().

Implements TrapdoorFunctionBounds.

Definition at line 45 of file esign.h.

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void ESIGNFunction::Initialize ( const Integer n,
const Integer e 
)
inline

Initialize a ESIGN public key with {n,e}.

Parameters
nthe modulus
ethe public exponent

Definition at line 30 of file esign.h.

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Integer ESIGNFunction::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 44 of file esign.h.

void ESIGNFunction::SetModulus ( const Integer n)
inline

Definition at line 51 of file esign.h.

void ESIGNFunction::SetPublicExponent ( const Integer e)
inline

Definition at line 52 of file esign.h.

bool ESIGNFunction::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.

Reimplemented in InvertibleESIGNFunction.

Definition at line 59 of file esign.cpp.

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Member Data Documentation

Integer ESIGNFunction::m_e
protected

Definition at line 58 of file esign.h.

Integer ESIGNFunction::m_n
protected

Definition at line 58 of file esign.h.


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