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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cms;

import java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.operator.InputAEADDecryptor;
import org.bouncycastle.operator.InputDecryptor;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.util.io.TeeInputStream;

public class RecipientOperator
{
    private final Object operator;

    public RecipientOperator(InputDecryptor decryptor)
    {
        this.operator = decryptor;
    }

    public RecipientOperator(MacCalculator macCalculator)
    {
        this.operator = macCalculator;
    }

    public InputStream getInputStream(InputStream dataIn)
    {
        if (operator instanceof InputDecryptor)
        {
            return ((InputDecryptor)operator).getInputStream(dataIn);
        }
        else
        {
            return new TeeInputStream(dataIn, ((MacCalculator)operator).getOutputStream());
        }
    }

    public boolean isAEADBased()
    {
        return operator instanceof InputAEADDecryptor;
    }

    public OutputStream getAADStream()
    {
        return ((InputAEADDecryptor)operator).getAADStream();
    }

    public boolean isMacBased()
    {
        return operator instanceof MacCalculator;
    }

    public byte[] getMac()
    {
        return ((MacCalculator)operator).getMac();
    }
}