XECPublicKeySpec (Java SE 12 & JDK 12 )

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

Constructors
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 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - 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 Detail
  - 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