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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls.crypto.impl.jcajce;

import java.io.IOException;
import java.security.KeyPair;

import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;

import org.bouncycastle.tls.crypto.TlsAgreement;
import org.bouncycastle.tls.crypto.TlsSecret;

/**
 * Support class for ephemeral Diffie-Hellman using the JCE.
 */
public class JceTlsDH
    implements TlsAgreement
{
    protected final JceTlsDHDomain domain;

    protected KeyPair localKeyPair;
    protected DHPublicKey peerPublicKey;

    public JceTlsDH(JceTlsDHDomain domain)
    {
        this.domain = domain;
    }

    public byte[] generateEphemeral() throws IOException
    {
        this.localKeyPair = domain.generateKeyPair();
        return domain.encodePublicKey((DHPublicKey)localKeyPair.getPublic());
    }

    public void receivePeerValue(byte[] peerValue) throws IOException
    {
        this.peerPublicKey = domain.decodePublicKey(peerValue);
    }

    public TlsSecret calculateSecret() throws IOException
    {
        return domain.calculateDHAgreement((DHPrivateKey)localKeyPair.getPrivate(), peerPublicKey);
    }
}