org.cryptimeleon.math.structures.groups.lazy

Class NeutralLazyGroupElement

java.lang.Object

org.cryptimeleon.math.structures.groups.lazy.LazyGroupElement

org.cryptimeleon.math.structures.groups.lazy.NeutralLazyGroupElement

All Implemented Interfaces:

UniqueByteRepresentable, Representable, Element, GroupElement

public class NeutralLazyGroupElement
extends LazyGroupElement

Represents the neutral group element in the lazy evaluation framework.

Nested Class Summary

Nested classes/interfaces inherited from class org.cryptimeleon.math.structures.groups.lazy.LazyGroupElement

LazyGroupElement.ComputationState

Field Summary

Fields inherited from class org.cryptimeleon.math.structures.groups.lazy.LazyGroupElement

group

Constructor Summary

Constructors

Constructor and Description
NeutralLazyGroupElement(LazyGroup group)

Method Summary

Modifier and Type	Method and Description
protected GroupElementImpl	accumulateMultiexp(Multiexponentiation multiexp) Writes down the value of this group element as a multiexponentiation.
protected void	computeConcreteValue() Computes the concrete value of the expression.

Methods inherited from class org.cryptimeleon.math.structures.groups.lazy.LazyGroupElement

compute, computeSync, equals, getConcreteValue, getPrecomputedSmallExponents, getRepresentation, getStructure, hashCode, inv, isComputed, isDefinitelySupposedToGetConcreteValue, isNeutralElement, op, pow, precomputePow, precomputePow, setConcreteValue, square, toString, updateAccumulator

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.cryptimeleon.math.structures.groups.GroupElement

expr, op, op, pow, pow, pow, pow, pow, pow

Methods inherited from interface org.cryptimeleon.math.hash.UniqueByteRepresentable

getUniqueByteRepresentation

Constructor Detail

NeutralLazyGroupElement

public NeutralLazyGroupElement(LazyGroup group)

Method Detail

computeConcreteValue

protected void computeConcreteValue()

Description copied from class: LazyGroupElement

Computes the concrete value of the expression. Goal is to call setConcreteValue(). Implementations should call getConcreteValue() on dependent LazyGroupElements if needed. May be called multiple times (in several threads), but generally, best effort is applied to only call once. So if the value this computes is not constant (e.g., is random), you should apply synchronization here and make sure you're always returning a consistent value here.

Specified by:

computeConcreteValue in class LazyGroupElement

accumulateMultiexp

protected GroupElementImpl accumulateMultiexp(Multiexponentiation multiexp)

Description copied from class: LazyGroupElement

Writes down the value of this group element as a multiexponentiation. Implementors shall return a value h and put values g_i^x_i into multiexp such that h * product(g_i^x_i) is the value of this LazyGroupElement. For h = 1, return null. Yes, this is slightly weird from an API design perspective, but it's for the sake of (probably premature) optimization.

Overrides:

accumulateMultiexp in class LazyGroupElement