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Added in API level 33

Summary: Inherited Constants | Methods | Inherited Methods

XECPublicKey

public interface XECPublicKey
implements PublicKey, XECKey

java.security.interfaces.XECPublicKey

An interface for an elliptic curve public key as defined by RFC 7748. These keys are distinct from the keys represented by ECPublicKey, and they are intended for use with algorithms based on RFC 7748 such as the XDH KeyAgreement algorithm. An XEC public key is a particular point on the curve, which is represented using only its u-coordinate as described in RFC 7748. 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.

Summary

Inherited constants

From interface java.security.PublicKey

long

serialVersionUID

This constant was deprecated in API level 34. A serialVersionUID field in an interface is ineffectual. Do not use; no replacement.

From interface java.security.Key

long

serialVersionUID

This constant was deprecated in API level 34. A serialVersionUID field in an interface is ineffectual. Do not use; no replacement.

Public methods
`abstract BigInteger`	`getU()` Get the u coordinate of the point.

Inherited methods

From interface


        
          java.security.interfaces.XECKey


        abstract


        AlgorithmParameterSpec


      getParams()

Returns the algorithm parameters associated with the key.

From interface


        
          java.security.Key

`abstract String`	`getAlgorithm()` Returns the standard algorithm name for this key.
`abstract byte[]`	`getEncoded()` Returns the key in its primary encoding format, or null if this key does not support encoding.
`abstract String`	`getFormat()` Returns the name of the primary encoding format of this key, or null if this key does not support encoding.

Public methods

getU

Added in API level 33

public abstract BigInteger getU ()

Get the u coordinate of the point.

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

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Last updated 2026-08-03 UTC.

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