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The Bouncy Castle Java APIs for TLS and DTLS, including a provider for the JSSE.

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

import java.io.IOException;

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.SecretWithEncapsulation;
import org.bouncycastle.pqc.crypto.mlkem.MLKEMPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.mlkem.MLKEMPublicKeyParameters;
import org.bouncycastle.tls.crypto.TlsAgreement;
import org.bouncycastle.tls.crypto.TlsSecret;

public class BcTlsMLKem implements TlsAgreement
{
    protected final BcTlsMLKemDomain domain;

    protected MLKEMPrivateKeyParameters privateKey;
    protected MLKEMPublicKeyParameters publicKey;
    protected TlsSecret secret;

    public BcTlsMLKem(BcTlsMLKemDomain domain)
    {
        this.domain = domain;
    }

    public byte[] generateEphemeral() throws IOException
    {
        if (domain.isServer())
        {
            SecretWithEncapsulation encap = domain.encapsulate(publicKey);
            this.publicKey = null;
            this.secret = domain.adoptLocalSecret(encap.getSecret());
            return encap.getEncapsulation();
        }
        else
        {
            AsymmetricCipherKeyPair kp = domain.generateKeyPair();
            this.privateKey = (MLKEMPrivateKeyParameters)kp.getPrivate();
            return domain.encodePublicKey((MLKEMPublicKeyParameters)kp.getPublic());
        }
    }

    public void receivePeerValue(byte[] peerValue) throws IOException
    {
        if (domain.isServer())
        {
            this.publicKey = domain.decodePublicKey(peerValue);
        }
        else
        {
            this.secret = domain.decapsulate(privateKey, peerValue);
            this.privateKey = null;
        }
    }

    public TlsSecret calculateSecret() throws IOException
    {
        TlsSecret secret = this.secret;
        this.secret = null;
        return secret;
    }
}