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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 2.73.6 for Java 8 and later.

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package org.bouncycastle.crypto.parsers;

import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;

import org.bouncycastle.crypto.KeyParser;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPublicKeyParameters;
import org.bouncycastle.util.io.Streams;

public class DHIESPublicKeyParser
    implements KeyParser
{
    private DHParameters dhParams;

    public DHIESPublicKeyParser(DHParameters dhParams)
    {
        this.dhParams = dhParams;
    }

    public AsymmetricKeyParameter readKey(InputStream stream)
        throws IOException
    {
        byte[] V = new byte[(dhParams.getP().bitLength() + 7) / 8];

        Streams.readFully(stream, V, 0, V.length);

        return new DHPublicKeyParameters(new BigInteger(1, V), dhParams);
    }
}