TrapdoorFunctionInverse Class Reference

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

Inheritance diagram for TrapdoorFunctionInverse:

List of all members.

Public Member Functions
Integer	CalculateRandomizedInverse (RandomNumberGenerator &rng, const Integer &x) const
	Applies the inverse of the trapdoor function.
bool	IsRandomized () const
	Determines if the decryption algorithm is randomized.
virtual Integer	CalculateInverse (RandomNumberGenerator &rng, const Integer &x) const =0

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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 184 of file pubkey.h.

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Member Function Documentation

Integer TrapdoorFunctionInverse::CalculateRandomizedInverse	(	RandomNumberGenerator &	rng,
		const Integer &	x
	)			const [inline, virtual]

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 196 of file pubkey.h.

bool TrapdoorFunctionInverse::IsRandomized

(

)

const [inline, virtual]

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 202 of file pubkey.h.

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

• pubkey.h