org.cryptimeleon.craco.enc.asym.elgamal

Class ElgamalPrivateKey

java.lang.Object

org.cryptimeleon.craco.enc.asym.elgamal.ElgamalPrivateKey

All Implemented Interfaces:

DecryptionKey, org.cryptimeleon.math.serialization.Representable

public class ElgamalPrivateKey
extends java.lang.Object
implements DecryptionKey

An elgamal private key.

Constructor Summary

Constructors

Constructor and Description
ElgamalPrivateKey(ElgamalPublicKey pub, org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement a)
ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG) Create a new ElGamal private key.
ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG, org.cryptimeleon.math.structures.groups.GroupElement g) Creates a new ElGamal private key.
ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG, org.cryptimeleon.math.structures.groups.GroupElement g, org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement a) Creates a new ElGamal private key.
ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG, org.cryptimeleon.math.structures.groups.GroupElement g, org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement a, org.cryptimeleon.math.structures.groups.GroupElement h) Creates a new Elgamal private key.
ElgamalPrivateKey(org.cryptimeleon.math.serialization.Representation repr, ElgamalEncryption scheme)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj)
org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement	getA()
org.cryptimeleon.math.structures.groups.GroupElement	getG()
org.cryptimeleon.math.structures.groups.Group	getGroupG()
ElgamalPublicKey	getPublicKey()
org.cryptimeleon.math.serialization.Representation	getRepresentation()
int	hashCode()
void	setPublicKey(ElgamalPublicKey pk)

Methods inherited from class java.lang.Object

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

Constructor Detail

ElgamalPrivateKey

public ElgamalPrivateKey(org.cryptimeleon.math.serialization.Representation repr,
                         ElgamalEncryption scheme)

ElgamalPrivateKey

public ElgamalPrivateKey(ElgamalPublicKey pub,
                         org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement a)

ElgamalPrivateKey

public ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG,
                         org.cryptimeleon.math.structures.groups.GroupElement g,
                         org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement a,
                         org.cryptimeleon.math.structures.groups.GroupElement h)

Creates a new Elgamal private key.

Parameters:

groupG - the group

g - a generator of the group groupG

a - the private exponent such that \(h = g^a\)

h - the public key \(h = g^a\)

ElgamalPrivateKey

public ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG,
                         org.cryptimeleon.math.structures.groups.GroupElement g,
                         org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement a)

Creates a new ElGamal private key.

Sets the public parameter h=g^a.

Parameters:

groupG - the group of this key

g - a generator of this group

a - the private exponent

ElgamalPrivateKey

public ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG,
                         org.cryptimeleon.math.structures.groups.GroupElement g)

Creates a new ElGamal private key.

Chooses a uniformly at random in {0,...,n-1} where n is the size of the group. Sets the public parameter h=g^a.

Parameters:

groupG - the group of this key

g - a generator of this group

ElgamalPrivateKey

public ElgamalPrivateKey(org.cryptimeleon.math.structures.groups.Group groupG)

Create a new ElGamal private key.

Chooses a random generator g of the given cyclic group of order n. Chooses a random exponent a in {0,....,n-1} and sets the private key to g,a,h=g^a

Parameters:

groupG - the group over which ElGamal is done

Method Detail

getPublicKey

public ElgamalPublicKey getPublicKey()

setPublicKey

public void setPublicKey(ElgamalPublicKey pk)

getRepresentation

public org.cryptimeleon.math.serialization.Representation getRepresentation()

Specified by:

getRepresentation in interface org.cryptimeleon.math.serialization.Representable

getA

public org.cryptimeleon.math.structures.rings.zn.Zn.ZnElement getA()

getGroupG

public org.cryptimeleon.math.structures.groups.Group getGroupG()

getG

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

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object