Applies the trapdoor function, using random data if required. More...

Inheritance diagram for RandomizedTrapdoorFunction:

Public Member Functions
virtual Integer	ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const =0
	Applies the trapdoor function, using random data if required. More...

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

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, using random data if required.

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 98 of file pubkey.h.

Member Function Documentation

virtual Integer RandomizedTrapdoorFunction::ApplyRandomizedFunction	(	RandomNumberGenerator &	rng,
		const Integer &	x
	)		const

pure virtual

Applies the trapdoor function, using random data if required.

Parameters

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

Returns: the message x encrypted under the public key

ApplyRandomizedFunction is a generalization of encryption under a public key cryptosystem. The RandomNumberGenerator may (or may not) be required. Derived classes must implement it.

Implemented in TrapdoorFunction.

virtual bool RandomizedTrapdoorFunction::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.

Reimplemented in TrapdoorFunction.

Definition at line 114 of file pubkey.h.

virtual Integer TrapdoorFunctionBounds::PreimageBound ( ) const

pure virtualinherited

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().

Implemented in InvertibleRSAFunction_ISO, RSAFunction_ISO, LUCFunction, RSAFunction, ESIGNFunction, RWFunction, and RabinFunction.

virtual Integer TrapdoorFunctionBounds::ImageBound ( ) const

pure virtualinherited

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().

Implemented in LUCFunction, RSAFunction, ESIGNFunction, RWFunction, and RabinFunction.

virtual Integer TrapdoorFunctionBounds::MaxPreimage ( ) const

inlinevirtualinherited

Returns the maximum size of a message before the trapdoor function is applied bound to a public key.

Returns: the maximum size of a message before the trapdoor function is applied bound to a public key

The default implementation returns PreimageBound() - 1.

Definition at line 85 of file pubkey.h.

virtual Integer TrapdoorFunctionBounds::MaxImage ( ) const

inlinevirtualinherited

Returns the maximum size of a message after the trapdoor function is applied bound to a public key.

Returns: the the maximum size of a message after the trapdoor function is applied bound to a public key

The default implementation returns ImageBound() - 1.

Definition at line 89 of file pubkey.h.

Referenced by ESIGNFunction::ApplyFunction().

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

pubkey.h

Public Member Functions

Detailed Description

Member Function Documentation