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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 1.4.

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package org.bouncycastle.crypto.params;

import org.bouncycastle.crypto.CipherParameters;

/**
 * Parameters holder for static/ephemeral agreement as described in NIST SP 800-56A.
 */
public class DHUPublicParameters
    implements CipherParameters
{
    private DHPublicKeyParameters staticPublicKey;
    private DHPublicKeyParameters ephemeralPublicKey;

    public DHUPublicParameters(
        DHPublicKeyParameters   staticPublicKey,
        DHPublicKeyParameters   ephemeralPublicKey)
    {
        if (staticPublicKey == null)
        {
            throw new NullPointerException("staticPublicKey cannot be null");
        }
        if (ephemeralPublicKey == null)
        {
            throw new NullPointerException("ephemeralPublicKey cannot be null");
        }
        if (!staticPublicKey.getParameters().equals(ephemeralPublicKey.getParameters()))
        {
            throw new IllegalArgumentException("Static and ephemeral public keys have different domain parameters");
        }

        this.staticPublicKey = staticPublicKey;
        this.ephemeralPublicKey = ephemeralPublicKey;
    }

    public DHPublicKeyParameters getStaticPublicKey()
    {
        return staticPublicKey;
    }

    public DHPublicKeyParameters getEphemeralPublicKey()
    {
        return ephemeralPublicKey;
    }
}