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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 1.4. 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;

public class KEMRecipientInformation
    extends RecipientInformation
{
    private KEMRecipientInfo info;

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

        this.info = info;

        RecipientIdentifier r = info.getRecipientIdentifier();

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

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

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

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