Applies the trapdoor function. More...

Inheritance diagram for TrapdoorFunction:

Public Member Functions
Integer	ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const
	Applies the trapdoor function. More...

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

virtual Integer	ApplyFunction (const Integer &x) const =0
	Applies the trapdoor. More...

Public Member Functions inherited from TrapdoorFunctionBounds
virtual Integer	PreimageBound () const =0
	Returns the maximum size of a message before the trapdoor function is applied. More...

virtual Integer	ImageBound () const =0
	Returns the maximum size of a message after the trapdoor function is applied. More...

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...

Detailed Description

Applies the trapdoor function.

ApplyFunction() is the foundation for encrypting a message under a public key. Derived classes will override it at some point.

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

Definition at line 133 of file pubkey.h.

Member Function Documentation

Integer TrapdoorFunction::ApplyRandomizedFunction	(	RandomNumberGenerator &	rng,
		const Integer &	x
	)		const

inlinevirtual

Applies the trapdoor function.

Parameters

rng	a `RandomNumberGenerator` derived class
x	the message on which the encryption function is applied `ApplyRandomizedFunction` is a generalization of encryption under a public key cryptosystem. The `RandomNumberGenerator` may (or may not) be required. Internally, `ApplyRandomizedFunction()` calls `ApplyFunction()` without the `RandomNumberGenerator`.

Definition at line 147 of file pubkey.h.

bool TrapdoorFunction::IsRandomized ( ) const

inlinevirtual

Determines if the encryption algorithm is randomized.

Returns: true if the encryption algorithm is randomized, false otherwise If IsRandomized() returns false, then NullRNG() can be used.

Definition at line 149 of file pubkey.h.

virtual Integer TrapdoorFunction::ApplyFunction ( const Integer & x ) const

pure virtual

Applies the trapdoor.

Parameters

x	the 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.

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