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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.IOException;

import org.bouncycastle.asn1.cms.KEKIdentifier;
import org.bouncycastle.asn1.cms.KEKRecipientInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * the RecipientInfo class for a recipient who has been sent a message
 * encrypted using a secret key known to the other side.
 */
public class KEKRecipientInformation
    extends RecipientInformation
{
    private KEKRecipientInfo      info;

    KEKRecipientInformation(
        KEKRecipientInfo        info,
        AlgorithmIdentifier     messageAlgorithm,
        CMSSecureReadable       secureReadable,
        AuthAttributesProvider  additionalData)
    {
        super(info.getKeyEncryptionAlgorithm(), messageAlgorithm, secureReadable, additionalData);

        this.info = info;

        KEKIdentifier kekId = info.getKekid();

        this.rid = new KEKRecipientId(kekId.getKeyIdentifier().getOctets());
    }

    protected RecipientOperator getRecipientOperator(Recipient recipient)
        throws CMSException, IOException
    {
        return ((KEKRecipient)recipient).getRecipientOperator(keyEncAlg, messageAlgorithm, info.getEncryptedKey().getOctets());
    }
}