ECPoint (Java 2 Platform SE 5.0) (original) (raw)

java.security.spec

Class ECPoint

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

public class ECPoint

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](../../../java/security/spec/ECPoint.html#ECPoint%28java.math.BigInteger, java.math.BigInteger%29)(BigInteger x,BigInteger y) Creates an ECPoint from the specified affine x-coordinatex 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](../../../java/lang/Object.html#wait%28long, int%29)

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-coordinatex and affine y-coordinate y.

Parameters:

x - the affine x-coordinate.

y - the affine y-coordinate.

Throws:

[NullPointerException](../../../java/lang/NullPointerException.html "class in java.lang") - 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](../../../java/lang/Object.html#equals%28java.lang.Object%29) in class [Object](../../../java/lang/Object.html "class in java.lang")

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](../../../java/lang/Object.html#hashCode%28%29) in class [Object](../../../java/lang/Object.html "class in java.lang")

Returns:

a hash code value.

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.