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

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

Constructor Summary

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:

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