TrapdoorFunctionInverse Class Reference

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

Inheritance diagram for TrapdoorFunctionInverse:

Public Member Functions
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...

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 178 of file pubkey.h.

Member Function Documentation

CalculateRandomizedInverse()

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 190 of file pubkey.h.

IsRandomized()

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 196 of file pubkey.h.

CalculateInverse()

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 InvertibleRWFunction, InvertibleRSAFunction_ISO, InvertibleRSAFunction, InvertibleRabinFunction, and InvertibleLUCFunction.

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

• pubkey.h