Java™ Platform
Standard Ed. 6

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

Java™ Platform
Standard Ed. 6

Submit a bug or feature
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.

Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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