ECPoint

public class ECPoint extends Object

This immutable class represents a point on an elliptic curve (EC) in affine coordinates. Other coordinate systems can extend this class to represent this point in other coordinates.

Field Summary

public static final ECPoint POINT_INFINITY This defines the point at infinity.

Public Constructor Summary

ECPoint(BigInteger x, BigInteger y)
Creates an ECPoint from the specified affine x-coordinate x and affine y-coordinate y.

Public Method Summary

boolean
equals(Object obj)
Compares this elliptic curve point for equality with the specified object.
BigInteger
getAffineX()
Returns the affine x-coordinate x.
BigInteger
getAffineY()
Returns the affine y-coordinate y.
int
hashCode()
Returns a hash code value for this elliptic curve point.

Inherited Method Summary

Fields

public static final ECPoint POINT_INFINITY

This defines the point at infinity.

Public Constructors

public ECPoint (BigInteger x, BigInteger y)

Creates an ECPoint from the specified affine x-coordinate x and affine y-coordinate y.

Parameters
x the affine x-coordinate.
y the affine y-coordinate.
Throws
NullPointerException if x or y is null.

Public Methods

public boolean equals (Object obj)

Compares this elliptic curve point for equality with the specified object.

Parameters
obj the object to be compared.
Returns
  • true if obj is an instance of ECPoint and the affine coordinates match, false otherwise.

public BigInteger getAffineX ()

Returns the affine x-coordinate x. Note: POINT_INFINITY has a null affine x-coordinate.

Returns
  • the affine x-coordinate.

public BigInteger getAffineY ()

Returns the affine y-coordinate y. Note: POINT_INFINITY has a null affine y-coordinate.

Returns
  • the affine y-coordinate.

public int hashCode ()

Returns a hash code value for this elliptic curve point.

Returns
  • a hash code value.