Class XECPublicKeySpec

java.lang.Object

java.security.spec.XECPublicKeySpec

All Implemented Interfaces:: KeySpec

public class XECPublicKeySpec extends Object implements KeySpec

A class representing elliptic curve public keys as defined in RFC 7748, including the curve and other algorithm parameters. The public key is a particular point on the curve, which is represented using only its u-coordinate. A u-coordinate is an element of the field of integers modulo some value that is determined by the algorithm parameters. This field element is represented by a BigInteger which may hold any value. That is, the BigInteger is not restricted to the range of canonical field elements.

Since:: 11

Constructor Summary

Constructor	Description
`XECPublicKeySpec(AlgorithmParameterSpec params, BigInteger u)`	Construct a public key spec using the supplied parameters and u coordinate.

Method Summary

Modifier and Type	Method	Description
`AlgorithmParameterSpec`	`getParams()`	Get the algorithm parameters that define the curve and other settings.
`BigInteger`	`getU()`	Get the u coordinate of the point.

Methods declared in class Object

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

Constructor Details

XECPublicKeySpec

public XECPublicKeySpec(AlgorithmParameterSpec params, BigInteger u)

Construct a public key spec using the supplied parameters and u coordinate.

Parameters:: params - the algorithm parameters; u - the u-coordinate of the point, represented using a BigInteger which may hold any value
Throws:: NullPointerException - if params or u is null.

Method Details

getParams

public AlgorithmParameterSpec getParams()

Get the algorithm parameters that define the curve and other settings.

Returns:: the parameters

getU

public BigInteger getU()

Get the u coordinate of the point.

Returns:: the u-coordinate, represented using a BigInteger which may hold any value

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https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/security/spec/XECPublicKeySpec.html