org.cryptimeleon.mclwrap.bn254

Class MclBilinearGroup

java.lang.Object

org.cryptimeleon.math.structures.groups.lazy.LazyBilinearGroup

org.cryptimeleon.mclwrap.bn254.MclBilinearGroup

All Implemented Interfaces:

org.cryptimeleon.math.serialization.Representable, org.cryptimeleon.math.serialization.StandaloneRepresentable, org.cryptimeleon.math.structures.groups.elliptic.BilinearGroup

public class MclBilinearGroup
extends org.cryptimeleon.math.structures.groups.lazy.LazyBilinearGroup

A wrapper (with lazy evaluation of operations) around the efficient type 3 Barreto-Naehrig or BLS pairing implementation provided by the Mcl library.

Operation evaluation is done lazily via LazyBilinearGroup. This class should be preferred over MclBasicBilinearGroup due to potential performance advantages.

See Also:

Mcl library on Github

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MclBilinearGroup.GroupChoice

Nested classes/interfaces inherited from interface org.cryptimeleon.math.structures.groups.elliptic.BilinearGroup

org.cryptimeleon.math.structures.groups.elliptic.BilinearGroup.Type

Field Summary

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

impl

Constructor Summary

Constructors

Constructor and Description
MclBilinearGroup()
MclBilinearGroup(MclBilinearGroup.GroupChoice groupChoice)
MclBilinearGroup(org.cryptimeleon.math.serialization.Representation repr)

Method Summary

Modifier and Type	Method and Description
static void	resetMclInitializationAndAcceptErrors() Usually, you can only instantiate one of the Mcl groups (BN/BLS).

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

equals, getBilinearMap, getG1, getG2, getGT, getHashIntoG1, getHashIntoG2, getHashIntoGT, getHomomorphismG2toG1, getPairingType, getRepresentation, getSecurityLevel, hashCode, instantiateBasicStuff, 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.BilinearGroup

getHashIntoZGroupExponent, getZn, size

Constructor Detail

MclBilinearGroup

public MclBilinearGroup()

MclBilinearGroup

public MclBilinearGroup(MclBilinearGroup.GroupChoice groupChoice)

MclBilinearGroup

public MclBilinearGroup(org.cryptimeleon.math.serialization.Representation repr)

Method Detail

resetMclInitializationAndAcceptErrors

public static void resetMclInitializationAndAcceptErrors()

Usually, you can only instantiate one of the Mcl groups (BN/BLS). If you try to instantiate the second one within the same JVM, you'll be met with an exception. This is a known limitation right now https://github.com/cryptimeleon/mclwrap/issues/5. Calling this method allows you to reset the group so that you can instantiate the "other" one. Please only call this if you know what you're doing. Existing GroupElements will be reinterpreted for the new group, so everything will behave pretty weirdly if you keep using them. This should be fine to do if you don't ever use the old Group/GroupElement/etc. objects anymore after calling this.