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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.crypto.agreement;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.CryptoServicesRegistrar;
import org.bouncycastle.crypto.RawAgreement;
import org.bouncycastle.crypto.params.X25519PrivateKeyParameters;
import org.bouncycastle.crypto.params.X25519PublicKeyParameters;

public final class X25519Agreement
    implements RawAgreement
{
    private X25519PrivateKeyParameters privateKey;

    public void init(CipherParameters parameters)
    {
        this.privateKey = (X25519PrivateKeyParameters)parameters;

        CryptoServicesRegistrar.checkConstraints(Utils.getDefaultProperties("X25519", this.privateKey));
    }

    public int getAgreementSize()
    {
        return X25519PrivateKeyParameters.SECRET_SIZE;
    }

    public void calculateAgreement(CipherParameters publicKey, byte[] buf, int off)
    {
        privateKey.generateSecret((X25519PublicKeyParameters)publicKey, buf, off);
    }
}