org.cryptimeleon.math.structures.groups.lazy

Class LazyBilinearMap

java.lang.Object

org.cryptimeleon.math.structures.groups.lazy.LazyBilinearMap

All Implemented Interfaces:

java.util.function.BiFunction<GroupElement,GroupElement,GroupElement>, BilinearMap

public class LazyBilinearMap
extends java.lang.Object
implements BilinearMap

A BilinearMapImpl wrapper implementing deferred (lazy) evaluation.

Allows for additional optimizations using information about the operations being applied.

For more information, see the documentation.

Field Summary

Fields

Modifier and Type	Field and Description
protected LazyGroup	g1
protected LazyGroup	g2
protected LazyGroup	gt
protected BilinearMapImpl	impl

Constructor Summary

Constructors

Constructor and Description
LazyBilinearMap(LazyGroup g1, LazyGroup g2, LazyGroup gt, BilinearMapImpl impl)

Method Summary

Modifier and Type	Method and Description
GroupElement	apply(GroupElement g1, GroupElement g2) Corresponds to this.apply(g1, g2, 1).
GroupElement	apply(GroupElement g1, GroupElement g2, java.math.BigInteger exponent) Computes \(e(g1,g2)^\text{exponent}\).
boolean	equals(java.lang.Object o)
Group	getG1() Returns the source group G1 associated with this bilinear map.
Group	getG2() Returns the source group G2 associated with this bilinear map.
Group	getGT() Returns the target group GT associated with this bilinear map.
BilinearMapImpl	getImpl()
int	hashCode()
boolean	isSymmetric() Returns true if e(g,h).equals(e(h,g)) for all g, h.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.cryptimeleon.math.structures.groups.elliptic.BilinearMap

apply, apply, applyExpr, applyExpr, applyExpr, applyExpr, innerProduct

Methods inherited from interface java.util.function.BiFunction

andThen

Field Detail

impl

protected BilinearMapImpl impl

g1

protected LazyGroup g1

g2

protected LazyGroup g2

gt

protected LazyGroup gt

Constructor Detail

LazyBilinearMap

public LazyBilinearMap(LazyGroup g1,
                       LazyGroup g2,
                       LazyGroup gt,
                       BilinearMapImpl impl)

Method Detail

getG1

public Group getG1()

Description copied from interface: BilinearMap

Returns the source group G1 associated with this bilinear map.

Specified by:

getG1 in interface BilinearMap

getG2

public Group getG2()

Description copied from interface: BilinearMap

Returns the source group G2 associated with this bilinear map.

Specified by:

getG2 in interface BilinearMap

getGT

public Group getGT()

Description copied from interface: BilinearMap

Returns the target group GT associated with this bilinear map.

Specified by:

getGT in interface BilinearMap

apply

public GroupElement apply(GroupElement g1,
                          GroupElement g2,
                          java.math.BigInteger exponent)

Description copied from interface: BilinearMap

Computes \(e(g1,g2)^\text{exponent}\).

Depending on the bilinear map and the involved groups, this may be more efficiently implemented than computing it directly via apply(g1,g2).pow(exponent). For example, implementations should do exponentiation in the group with the cheapest group operation.

Specified by:

apply in interface BilinearMap

Parameters:

g1 - left hand side argument for the pairing function

g2 - right hand side argument for the pairing function

exponent - the exponent to apply to the result of the pairing

apply

public GroupElement apply(GroupElement g1,
                          GroupElement g2)

Description copied from interface: BilinearMap

Corresponds to this.apply(g1, g2, 1).

Specified by:

apply in interface java.util.function.BiFunction<GroupElement,GroupElement,GroupElement>

Specified by:

apply in interface BilinearMap

Parameters:

g1 - left hand side argument for the pairing function

g2 - right hand side argument for the pairing function

isSymmetric

public boolean isSymmetric()

Description copied from interface: BilinearMap

Returns true if e(g,h).equals(e(h,g)) for all g, h.

Specified by:

isSymmetric in interface BilinearMap

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

getImpl

public BilinearMapImpl getImpl()