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 a hash code value for this elliptic curve point.

Methods declared in class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

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 a hash code value for this elliptic curve point.
Overrides:
hashCode in class Object
Returns:
a hash code value.
See Also:

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https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/security/spec/ECPoint.html