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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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());
    }
}