ch.epfl.dedis.lib.crypto

Class Bn256G2Point

java.lang.Object

ch.epfl.dedis.lib.crypto.Bn256G2Point

All Implemented Interfaces:

Point

public class Bn256G2Point
extends Object
implements Point

The point used as a public key for a Bn256 signature

Method Summary

Modifier and Type	Method and Description
Point	add(Point other) Add the two points together
Point	copy() Returns a hard copy of the point
byte[]	data()
boolean	equals(Object other) Checks the equality of two points
Point	getZero() Get the infinity (zero) point.
boolean	isZero() Returns true when the point is the zero value of the field
Point	mul(Scalar s) Multiply the point by the given scalar
Point	negate() Produces the negative version of the point
BN.GT	pair(Bn256G1Point g1) Perform the pairing operation on this point and G1.
byte[]	toBytes() Marshals the point
com.google.protobuf.ByteString	toProto() Returns the protobuf representation of the point that is the tag for the first 8 bytes and then the point as byte array
String	toString() Stringify the point using the hexadecimal shape

Methods inherited from class java.lang.Object

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

Method Detail

copy

public Point copy()

Returns a hard copy of the point

Specified by:

copy in interface Point

Returns:

the copy

equals

public boolean equals(Object other)

Checks the equality of two points

Specified by:

equals in interface Point

Overrides:

equals in class Object

Parameters:

other - the other point

Returns:

true when both are the same point

mul

public Point mul(Scalar s)

Multiply the point by the given scalar

Specified by:

mul in interface Point

Parameters:

s - the scalar

Returns:

the result of the multiplication

add

public Point add(Point other)

Add the two points together

Specified by:

add in interface Point

Parameters:

other - the other point

Returns:

the result of the addition

toProto

public com.google.protobuf.ByteString toProto()

Returns the protobuf representation of the point that is the tag for the first 8 bytes and then the point as byte array

Specified by:

toProto in interface Point

Returns:

the byte string of the marshaling

toBytes

public byte[] toBytes()

Marshals the point

Specified by:

toBytes in interface Point

Returns:

the byte array

isZero

public boolean isZero()

Returns true when the point is the zero value of the field

Specified by:

isZero in interface Point

Returns:

the result as boolean

negate

public Point negate()

Produces the negative version of the point

Specified by:

negate in interface Point

Returns:

the negative of the point

data

public byte[] data()

Specified by:

data in interface Point

toString

public String toString()

Stringify the point using the hexadecimal shape

Specified by:

toString in interface Point

Overrides:

toString in class Object

Returns:

an hex string

getZero

public Point getZero()

Get the infinity (zero) point.

Specified by:

getZero in interface Point

pair

public BN.GT pair(Bn256G1Point g1)

Perform the pairing operation on this point and G1.

Parameters:

g1 - is a point on G1.

Returns:

result of pairing.