org.cryptimeleon.craco.sig.sps.akot15.tcgamma

Class TCGAKOT15XSIGPublicParameters

java.lang.Object

org.cryptimeleon.craco.sig.sps.SPSPublicParameters

org.cryptimeleon.craco.sig.sps.akot15.AKOT15SharedPublicParameters

org.cryptimeleon.craco.sig.sps.akot15.tcgamma.TCGAKOT15XSIGPublicParameters

All Implemented Interfaces:

java.lang.Cloneable, PublicParameters, org.cryptimeleon.math.serialization.Representable, org.cryptimeleon.math.serialization.StandaloneRepresentable

public class TCGAKOT15XSIGPublicParameters
extends AKOT15SharedPublicParameters

The construction of the AKOT15 signature scheme FSPS2 requires the PublicParameters to match up across building blocks. This class extends these shared parameters with the elements required in TC_gamma's calculations if it is to be combined with SPSXSIGSignatureScheme This class represents a subset of SPSXSIGPublicParameters One should only be able to instantiate this class using an existing instance of SPSXSIGPublicParameters. Note: The original paper contains a typo in the section: "Procedure: Matching C_gbc to M_xsig -- Setup" [1, p.17] The additional generators (F_2, U_1) must be \in G_2 in order for the calculations to work

Field Summary

Fields

Modifier and Type	Field and Description
protected org.cryptimeleon.math.structures.groups.GroupElement	group2ElementF2 F^{tilde}_2 \in G_2 in the paper
protected org.cryptimeleon.math.structures.groups.GroupElement	group2ElementU1 F^{tilde}_1 \in G_2 in the paper

Fields inherited from class org.cryptimeleon.craco.sig.sps.akot15.AKOT15SharedPublicParameters

messageLength

Fields inherited from class org.cryptimeleon.craco.sig.sps.SPSPublicParameters

bilinearGroup, group1ElementG, group2ElementH

Constructor Summary

Constructors

Constructor and Description
TCGAKOT15XSIGPublicParameters(org.cryptimeleon.math.serialization.Representation repr)
TCGAKOT15XSIGPublicParameters(SPSXSIGPublicParameters xsigPublicParameters, int messageLength)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
org.cryptimeleon.math.structures.groups.GroupElement	getGroup2ElementF2()
org.cryptimeleon.math.structures.groups.GroupElement	getGroup2ElementU1()
int	hashCode()

Methods inherited from class org.cryptimeleon.craco.sig.sps.akot15.AKOT15SharedPublicParameters

clone, getBilinearGroup, getBilinearMap, getMessageLength, getRepresentation, setMessageLength

Methods inherited from class org.cryptimeleon.craco.sig.sps.SPSPublicParameters

getG1GroupGenerator, getG2GroupGenerator, getGT, getZp

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

group2ElementF2

protected org.cryptimeleon.math.structures.groups.GroupElement group2ElementF2

F^{tilde}_2 \in G_2 in the paper

group2ElementU1

protected org.cryptimeleon.math.structures.groups.GroupElement group2ElementU1

F^{tilde}_1 \in G_2 in the paper

Constructor Detail

TCGAKOT15XSIGPublicParameters

public TCGAKOT15XSIGPublicParameters(SPSXSIGPublicParameters xsigPublicParameters,
                                     int messageLength)

TCGAKOT15XSIGPublicParameters

public TCGAKOT15XSIGPublicParameters(org.cryptimeleon.math.serialization.Representation repr)

Method Detail

getGroup2ElementF2

public org.cryptimeleon.math.structures.groups.GroupElement getGroup2ElementF2()

getGroup2ElementU1

public org.cryptimeleon.math.structures.groups.GroupElement getGroup2ElementU1()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class AKOT15SharedPublicParameters

hashCode

public int hashCode()

Overrides:

hashCode in class AKOT15SharedPublicParameters