ECPoint (Java Platform SE 6)

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Java™ Platform
Standard Ed. 6

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java.security.spec
Class ECPoint

java.lang.Object
 extended by java.security.spec.ECPoint

public class ECPoint
extends Object
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