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ECPoint (Java Platform SE 6)



















    






    

    



    
  
    
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java.security.spec

    
Class ECPoint
    

    java.lang.Object
  extended by 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
    static ECPoint POINT_INFINITY
              This defines the point at infinity.
     
    Constructor Summary
    ECPoint(BigInteger x, BigInteger y)
              Creates an ECPoint from the specified affine x-coordinate x and affine y-coordinate y.
     
    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.
     
    Methods inherited from class java.lang.Object
    clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
     

    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(), Hashtable

    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), Hashtable
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    For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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