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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.jcajce.spec;

import java.security.spec.AlgorithmParameterSpec;

import org.bouncycastle.internal.asn1.edec.EdECObjectIdentifiers;

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