XECPublicKeySpec (IBMJCEProvider Class Documentation)

Skip navigation links

Prev Class
Next Class

All Classes

Summary:
Nested |
Field |
Constr |
Method

Detail:
Field |
Constr |
Method

java.lang.Object
- ibm.security.internal.spec.XECPublicKeySpec

All Implemented Interfaces:

java.security.spec.KeySpec
```
public class XECPublicKeySpec
extends java.lang.Object
implements java.security.spec.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:

1.8

Constructor Summary

Constructors
Constructor and Description

XECPublicKeySpec(java.security.spec.AlgorithmParameterSpec params, java.math.BigInteger u)
Construct a public key spec from params

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`NamedParameterSpec`	`getParams()` Get the algorithm parameters.
`java.math.BigInteger`	`getU()` Get the u coordinate of the point.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - XECPublicKeySpec
```
public XECPublicKeySpec(java.security.spec.AlgorithmParameterSpec params,
                        java.math.BigInteger u)
                 throws java.lang.NullPointerException,
                        java.security.spec.InvalidParameterSpecException
```
    Construct a public key spec from params
    
    Parameters:
    
    params - the algorithm parameters
    
    u - the u-coordinate
    
    Throws:
    
    java.lang.NullPointerException - if either of u or params is null
    
    java.security.spec.InvalidParameterSpecException - if params is not of type NamedParameterSpec
- Method Detail
  - getU
```
public java.math.BigInteger getU()
```
    Get the u coordinate of the point.
    
    Returns:
    
    the u-coordinate, represented using a BigInteger which may hold any value.
  - getParams
```
public NamedParameterSpec getParams()
```
    Get the algorithm parameters.
    
    Returns:
    
    the algorithm parameters that define the curve and other settings.