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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 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cms;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cms.KEMRecipientInfo;
import org.bouncycastle.asn1.cms.RecipientIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;

public class KEMRecipientInformation
    extends RecipientInformation
{
    private KEMRecipientInfo info;

    KEMRecipientInformation(
        KEMRecipientInfo        info,
        AlgorithmIdentifier     messageAlgorithm,
        CMSSecureReadable       secureReadable)
    {
        super(info.getKem(), messageAlgorithm, secureReadable);

        this.info = info;

        RecipientIdentifier r = info.getRecipientIdentifier();

        if (r.isTagged())
        {
            ASN1OctetString octs = ASN1OctetString.getInstance(r.getId());

            rid = new KEMRecipientId(octs.getOctets());   // TODO: should be KEM
        }
        else
        {
            IssuerAndSerialNumber iAnds = IssuerAndSerialNumber.getInstance(r.getId());

            rid = new KEMRecipientId(iAnds.getName(), iAnds.getSerialNumber().getValue());    // TODO:
        }
    }

    public AlgorithmIdentifier getKdfAlgorithm()
    {
        return info.getKdf();
    }

    public byte[] getUkm()
    {
        return Arrays.clone(info.getUkm());
    }

    public byte[] getEncapsulation()
    {
        return Arrays.clone(info.getKemct().getOctets());
    }

    protected RecipientOperator getRecipientOperator(Recipient recipient)
        throws CMSException
    {
        return ((KEMRecipient)recipient).getRecipientOperator(new AlgorithmIdentifier(keyEncAlg.getAlgorithm(), info), messageAlgorithm, info.getEncryptedKey().getOctets());
    }
}