org.cryptimeleon.math.prf

Interface PseudorandomFunction

All Superinterfaces:

Representable, RepresentationRestorer, StandaloneRepresentable

All Known Implementing Classes:

AesPseudorandomFunction, LongAesPseudoRandomFunction

public interface PseudorandomFunction
extends StandaloneRepresentable, RepresentationRestorer

A pseudorandom function is a family of functions \((f_k)\) so that for random choice of the key k, \(f_k: X \rightarrow Y\) is computationally indistinguishable from a uniformly random function \(F: X \rightarrow Y\).

The way to use this interface is:

1. Generate a key k using generateKey()
2. Call evaluate(PrfKey, PrfPreimage) using key k and input x to receive \(y = f_k(x)\)

Method Summary

Modifier and Type	Method and Description
PrfImage	evaluate(PrfKey k, PrfPreimage x) Maps a preimage x to its image using key k.
PrfKey	generateKey() Generates a key k for use with this PRF.
default java.lang.Object	restoreFromRepresentation(java.lang.reflect.Type type, Representation repr) Takes a representation and creates an object of the given type from it if the type is supported by the restorer.
PrfImage	restoreImage(Representation repr) Restores an image y from its representation.
PrfKey	restoreKey(Representation repr) Restores a key k from its representation.
PrfPreimage	restorePreimage(Representation repr) Restores a preimage x from its representation.

Methods inherited from interface org.cryptimeleon.math.serialization.Representable

getRepresentation

Method Detail

generateKey

PrfKey generateKey()

Generates a key k for use with this PRF.

evaluate

PrfImage evaluate(PrfKey k,
                  PrfPreimage x)

Maps a preimage x to its image using key k.

Returns:

output of \(f_k(x)\)

restoreKey

PrfKey restoreKey(Representation repr)

Restores a key k from its representation.

restorePreimage

PrfPreimage restorePreimage(Representation repr)

Restores a preimage x from its representation.

restoreImage

PrfImage restoreImage(Representation repr)

Restores an image y from its representation.

restoreFromRepresentation

default java.lang.Object restoreFromRepresentation(java.lang.reflect.Type type,
                                                   Representation repr)

Description copied from interface: RepresentationRestorer

Takes a representation and creates an object of the given type from it if the type is supported by the restorer.

Specified by:

restoreFromRepresentation in interface RepresentationRestorer

Parameters:

type - tells the restorer which type the restored object should have

repr - the representation to restore the object from

Returns:

the restored object