Applies the inverse of the trapdoor function. More...

#include <pubkey.h>

Inheritance diagram for TrapdoorFunctionInverse:

Collaboration diagram for TrapdoorFunctionInverse:

Public Member Functions
virtual	~TrapdoorFunctionInverse ()

Integer	CalculateRandomizedInverse (RandomNumberGenerator &rng, const Integer &x) const
	Applies the inverse of the trapdoor function. More...

bool	IsRandomized () const
	Determines if the decryption algorithm is randomized. More...

virtual Integer	CalculateInverse (RandomNumberGenerator &rng, const Integer &x) const =0
	Calculates the inverse of an element. More...

Public Member Functions inherited from RandomizedTrapdoorFunctionInverse
virtual	~RandomizedTrapdoorFunctionInverse ()

Detailed Description

Applies the inverse of the trapdoor function.

CalculateInverse() is the foundation for decrypting a message under a private key in a public key cryptosystem. Derived classes will override it at some point.

See also: TrapdoorFunctionBounds(), RandomizedTrapdoorFunction(), TrapdoorFunction(), RandomizedTrapdoorFunctionInverse() and TrapdoorFunctionInverse()

Definition at line 183 of file pubkey.h.

Constructor & Destructor Documentation

virtual TrapdoorFunctionInverse::~TrapdoorFunctionInverse ( )

inlinevirtual

Definition at line 186 of file pubkey.h.

Member Function Documentation

virtual Integer TrapdoorFunctionInverse::CalculateInverse	(	RandomNumberGenerator &	rng,
		const Integer &	x
	)		const

pure virtual

Calculates the inverse of an element.

Parameters

rng	a `RandomNumberGenerator` derived class
x	the element

Returns: the inverse of the element in the group

Implemented in InvertibleRSAFunction_ISO, InvertibleRSAFunction, InvertibleLUCFunction, InvertibleRWFunction, and InvertibleRabinFunction.

Here is the caller graph for this function:

Integer TrapdoorFunctionInverse::CalculateRandomizedInverse	(	RandomNumberGenerator &	rng,
		const Integer &	x
	)		const

inlinevirtual

Applies the inverse of the trapdoor function.

Parameters

rng	a `RandomNumberGenerator` derived class
x	the message on which the decryption function is applied

Returns: the message x decrypted under the private key

CalculateRandomizedInverse is a generalization of decryption using the private key

Internally, CalculateRandomizedInverse() calls CalculateInverse() without the RandomNumberGenerator.

Implements RandomizedTrapdoorFunctionInverse.

Definition at line 195 of file pubkey.h.

bool TrapdoorFunctionInverse::IsRandomized ( ) const

inlinevirtual

Determines if the decryption algorithm is randomized.

Returns: true if the decryption algorithm is randomized, false otherwise

If IsRandomized() returns false, then NullRNG() can be used.

Reimplemented from RandomizedTrapdoorFunctionInverse.

Definition at line 201 of file pubkey.h.

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

src/cryptopp/pubkey.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation