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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.CryptoServiceProperties;
import org.bouncycastle.crypto.CryptoServicePurpose;
import org.bouncycastle.crypto.constraints.ConstraintUtils;
import org.bouncycastle.crypto.constraints.DefaultServiceProperties;
import org.bouncycastle.crypto.params.DHKeyParameters;
import org.bouncycastle.crypto.params.ECKeyParameters;
import org.bouncycastle.crypto.params.X25519PrivateKeyParameters;
import org.bouncycastle.crypto.params.X448PrivateKeyParameters;

class Utils
{
    static CryptoServiceProperties getDefaultProperties(String algorithm, ECKeyParameters k)
    {
        return new DefaultServiceProperties(algorithm, ConstraintUtils.bitsOfSecurityFor(k.getParameters().getCurve()), k, CryptoServicePurpose.AGREEMENT);
    }

    static CryptoServiceProperties getDefaultProperties(String algorithm, DHKeyParameters k)
    {
        return new DefaultServiceProperties(algorithm, ConstraintUtils.bitsOfSecurityFor(k.getParameters().getP()), k, CryptoServicePurpose.AGREEMENT);
    }

    static CryptoServiceProperties getDefaultProperties(String algorithm, X448PrivateKeyParameters k)
    {
        return new DefaultServiceProperties(algorithm, 224, k, CryptoServicePurpose.AGREEMENT);
    }

    static CryptoServiceProperties getDefaultProperties(String algorithm, X25519PrivateKeyParameters k)
    {
        return new DefaultServiceProperties(algorithm, 128, k, CryptoServicePurpose.AGREEMENT);
    }
}