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 Summary

    Fields
    Modifier and Type
    Field
    Description
    static final ECPoint
    POINT_INFINITY
    This defines the point at infinity.

  • Constructor Summary

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

  • Method Summary

    Modifier and Type
    Method
    Description
    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 the hash code value for this elliptic curve point.

    Methods declared in class Object

    clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    String
    toString()
    Returns a string representation of the object.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  • 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:

    • hashCode

      public int hashCode()
      Returns the hash code value for this elliptic curve point.
      Overrides:
      hashCode in class Object
      Returns:
      the hash code value for this elliptic curve point
      See Also: