• 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.

    Since:
    1.5

    • Field Detail

      • POINT_INFINITY

        public static final ECPoint POINT_INFINITY

        This defines the point at infinity.

    • Constructor Detail

      • ECPoint

        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.

    • Method Detail

      • getAffineX

        public BigInteger getAffineX()

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

        Returns:
        the affine x-coordinate.

      • getAffineY

        public BigInteger getAffineY()

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

        Returns:
        the affine y-coordinate.

      • equals

        public boolean equals​(Object obj)

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

        Overrides:
        equals in class Object
        Parameters:
        obj - the object to be compared.
        Returns:
        true if obj is an instance of ECPoint and the affine coordinates match, false otherwise.
        See Also:
        Object.hashCode(), HashMap