package org.bouncycastle.jcajce.spec;

import java.security.spec.AlgorithmParameterSpec;

import org.bouncycastle.asn1.edec.EdECObjectIdentifiers;

ParameterSpec for XDH key agreement algorithms.
/**
 * ParameterSpec for XDH key agreement algorithms.
 */
public class XDHParameterSpec
    implements AlgorithmParameterSpec
{
    public static final String X25519 = "X25519";
    public static final String X448 = "X448";

    private final String curveName;

    
Base constructor.
Params:
curveName – name of the curve to specify./**
     * Base constructor.
     *
     * @param curveName name of the curve to specify.
     */
    public XDHParameterSpec(String curveName)
    {
        if (curveName.equalsIgnoreCase(X25519))
        {
            this.curveName = X25519;
        }
        else if (curveName.equalsIgnoreCase(X448))
        {
            this.curveName = X448;
        }
        else if (curveName.equals(EdECObjectIdentifiers.id_X25519.getId()))
        {
            this.curveName = X25519;
        }
        else if (curveName.equals(EdECObjectIdentifiers.id_X448.getId()))
        {
            this.curveName = X448;
        }
        else
        {
            throw new IllegalArgumentException("unrecognized curve name: " + curveName);
        }
    }

    
Return the curve name specified by this parameterSpec.
Returns:
the name of the curve this parameterSpec specifies./**
     * Return the curve name specified by this parameterSpec.
     *
     * @return the name of the curve this parameterSpec specifies.
     */
    public String getCurveName()
    {
        return curveName;
    }
}