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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 java.io.IOException;
import java.util.List;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cms.KeyAgreeRecipientIdentifier;
import org.bouncycastle.asn1.cms.KeyAgreeRecipientInfo;
import org.bouncycastle.asn1.cms.OriginatorIdentifierOrKey;
import org.bouncycastle.asn1.cms.OriginatorPublicKey;
import org.bouncycastle.asn1.cms.RecipientEncryptedKey;
import org.bouncycastle.asn1.cms.RecipientKeyIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;

/**
 * the RecipientInfo class for a recipient who has been sent a message
 * encrypted using key agreement.
 */
public class KeyAgreeRecipientInformation
    extends RecipientInformation
{
    private KeyAgreeRecipientInfo info;
    private ASN1OctetString       encryptedKey;

    static void readRecipientInfo(List infos, KeyAgreeRecipientInfo info,
        AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable, AuthAttributesProvider additionalData)
    {
        ASN1Sequence s = info.getRecipientEncryptedKeys();

        for (int i = 0; i < s.size(); ++i)
        {
            RecipientEncryptedKey id = RecipientEncryptedKey.getInstance(
                s.getObjectAt(i));

            RecipientId rid;

            KeyAgreeRecipientIdentifier karid = id.getIdentifier();
            IssuerAndSerialNumber iAndSN = karid.getIssuerAndSerialNumber();

            if (iAndSN != null)
            {
                rid = new KeyAgreeRecipientId(iAndSN.getName(), iAndSN.getSerialNumber().getValue());
            }
            else
            {
                RecipientKeyIdentifier rKeyID = karid.getRKeyID();

                // Note: 'date' and 'other' fields of RecipientKeyIdentifier appear to be only informational

                rid = new KeyAgreeRecipientId(rKeyID.getSubjectKeyIdentifier().getOctets());
            }

            infos.add(new KeyAgreeRecipientInformation(info, rid, id.getEncryptedKey(), messageAlgorithm,
                secureReadable, additionalData));
        }
    }

    KeyAgreeRecipientInformation(
        KeyAgreeRecipientInfo   info,
        RecipientId             rid,
        ASN1OctetString         encryptedKey,
        AlgorithmIdentifier     messageAlgorithm,
        CMSSecureReadable       secureReadable,
        AuthAttributesProvider  additionalData)
    {
        super(info.getKeyEncryptionAlgorithm(), messageAlgorithm, secureReadable, additionalData);

        this.info = info;
        this.rid = rid;
        this.encryptedKey = encryptedKey;
    }

    private SubjectPublicKeyInfo getSenderPublicKeyInfo(AlgorithmIdentifier recKeyAlgId,
        OriginatorIdentifierOrKey originator)
        throws CMSException, IOException
    {
        OriginatorPublicKey opk = originator.getOriginatorKey();
        if (opk != null)
        {
            return getPublicKeyInfoFromOriginatorPublicKey(recKeyAlgId, opk);
        }

        OriginatorId origID;

        IssuerAndSerialNumber iAndSN = originator.getIssuerAndSerialNumber();
        if (iAndSN != null)
        {
            origID = new OriginatorId(iAndSN.getName(), iAndSN.getSerialNumber().getValue());
        }
        else
        {
            SubjectKeyIdentifier ski = originator.getSubjectKeyIdentifier();

            origID = new OriginatorId(ski.getKeyIdentifier());
        }

        return getPublicKeyInfoFromOriginatorId(origID);
    }

    private SubjectPublicKeyInfo getPublicKeyInfoFromOriginatorPublicKey(AlgorithmIdentifier recKeyAlgId,
            OriginatorPublicKey originatorPublicKey)
    {
        SubjectPublicKeyInfo pubInfo = new SubjectPublicKeyInfo(
            recKeyAlgId,
            originatorPublicKey.getPublicKey().getBytes());

        return pubInfo;
    }

    private SubjectPublicKeyInfo getPublicKeyInfoFromOriginatorId(OriginatorId origID)
            throws CMSException
    {
        // TODO Support all alternatives for OriginatorIdentifierOrKey
        // see RFC 3852 6.2.2
        throw new CMSException("No support for 'originator' as IssuerAndSerialNumber or SubjectKeyIdentifier");
    }

    protected RecipientOperator getRecipientOperator(Recipient recipient)
        throws CMSException, IOException
    {
        KeyAgreeRecipient agreeRecipient = (KeyAgreeRecipient)recipient;
                AlgorithmIdentifier    recKeyAlgId = agreeRecipient.getPrivateKeyAlgorithmIdentifier();

        return ((KeyAgreeRecipient)recipient).getRecipientOperator(keyEncAlg, messageAlgorithm, getSenderPublicKeyInfo(recKeyAlgId,
                        info.getOriginator()), info.getUserKeyingMaterial(), encryptedKey.getOctets());
    }
}