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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 java.io.IOException;
import java.security.Key;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.Provider;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cms.KeyTransRecipientInfo;
import org.bouncycastle.asn1.cms.RecipientIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.jcajce.JceKeyTransAuthenticatedRecipient;
import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;
import org.bouncycastle.cms.jcajce.JceKeyTransRecipient;


/**
 * the KeyTransRecipientInformation class for a recipient who has been sent a secret
 * key encrypted using their public key that needs to be used to
 * extract the message.
 */
public class KeyTransRecipientInformation
    extends RecipientInformation
{
    private KeyTransRecipientInfo info;

    KeyTransRecipientInformation(
        KeyTransRecipientInfo   info,
        AlgorithmIdentifier     messageAlgorithm,
        CMSSecureReadable       secureReadable,
        AuthAttributesProvider  additionalData)
    {
        super(info.getKeyEncryptionAlgorithm(), messageAlgorithm, secureReadable, additionalData);

        this.info = info;

        RecipientIdentifier r = info.getRecipientIdentifier();

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

            rid = new KeyTransRecipientId(octs.getOctets());
        }
        else
        {
            IssuerAndSerialNumber   iAnds = IssuerAndSerialNumber.getInstance(r.getId());

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

    /**
     * decrypt the content and return it
     * @deprecated use getContentStream(Recipient) method
     */
    public CMSTypedStream getContentStream(
        Key key,
        String prov)
        throws CMSException, NoSuchProviderException
    {
        return getContentStream(key, CMSUtils.getProvider(prov));
    }

    /**
     * decrypt the content and return it
     * @deprecated use getContentStream(Recipient) method
     */
    public CMSTypedStream getContentStream(
        Key key,
        Provider prov)
        throws CMSException
    {
        try
        {
            JceKeyTransRecipient recipient;

            if (secureReadable instanceof CMSEnvelopedHelper.CMSEnvelopedSecureReadable)
            {
                recipient = new JceKeyTransEnvelopedRecipient((PrivateKey)key);
            }
            else
            {
                recipient = new JceKeyTransAuthenticatedRecipient((PrivateKey)key);
            }

            if (prov != null)
            {
                recipient.setProvider(prov);
                if (prov.getName().equalsIgnoreCase("SunJCE"))
                {
                    recipient.setContentProvider((String)null);    // need to fall back to generic search
                }
            }

            return getContentStream(recipient);
        }
        catch (IOException e)
        {
            throw new CMSException("encoding error: " + e.getMessage(), e);
        }
    }

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