Module java.base
Package java.security.spec

Class ECPoint

java.lang.Object
java.security.spec.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.
Since:
1.5

  • Field Details

    • POINT_INFINITY

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

  • Constructor Details

    • 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 Details

    • 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

    • hashCode

      public int hashCode()
      Returns a hash code value for this elliptic curve point.
      Overrides:
      hashCode in class Object
      Returns:
      a hash code value.
      See Also:
      Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)