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The Bouncy Castle Java CMS and S/MIME APIs for handling the CMS and S/MIME protocols. This jar contains CMS and S/MIME APIs for JDK 1.5. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. If the S/MIME API is used, the JavaMail API and the Java activation framework will also be needed.
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package org.bouncycastle.cms;

import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.KEKRecipientInfo;
import org.bouncycastle.asn1.cms.KeyAgreeRecipientInfo;
import org.bouncycastle.asn1.cms.KeyTransRecipientInfo;
import org.bouncycastle.asn1.cms.PasswordRecipientInfo;
import org.bouncycastle.asn1.cms.RecipientInfo;
import org.bouncycastle.asn1.cms.AuthenticatedData;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.AlgorithmParameters;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.util.ArrayList;
import java.util.List;

/**
 * containing class for an CMS Authenticated Data object
 */
public class CMSAuthenticatedData
{
    RecipientInformationStore   recipientInfoStore;
    ContentInfo                 contentInfo;

    private AlgorithmIdentifier macAlg;
    private ASN1Set authAttrs;
    private ASN1Set unauthAttrs;
    private byte[] mac;

    public CMSAuthenticatedData(
        byte[]    authData)
        throws CMSException
    {
        this(CMSUtils.readContentInfo(authData));
    }

    public CMSAuthenticatedData(
        InputStream    authData)
        throws CMSException
    {
        this(CMSUtils.readContentInfo(authData));
    }

    public CMSAuthenticatedData(
        ContentInfo contentInfo)
        throws CMSException
    {
        this.contentInfo = contentInfo;

        AuthenticatedData authData = AuthenticatedData.getInstance(contentInfo.getContent());

        //
        // read the encapsulated content info
        //
        ContentInfo encInfo = authData.getEncapsulatedContentInfo();

        this.macAlg = authData.getMacAlgorithm();
        this.mac = authData.getMac().getOctets();

        //
        // load the RecipientInfoStore
        //
        ASN1Set     s = authData.getRecipientInfos();
        List        infos = new ArrayList();
        byte[]      contentOctets = ASN1OctetString.getInstance(encInfo.getContent()).getOctets();

        for (int i = 0; i != s.size(); i++)
        {
            RecipientInfo   info = RecipientInfo.getInstance(s.getObjectAt(i));
            InputStream     contentStream = new ByteArrayInputStream(contentOctets);
            Object          type = info.getInfo();

            if (type instanceof KeyTransRecipientInfo)
            {
                infos.add(new KeyTransRecipientInformation(
                    (KeyTransRecipientInfo)type, null, macAlg, contentStream));
            }
            else if (type instanceof KEKRecipientInfo)
            {
                infos.add(new KEKRecipientInformation(
                    (KEKRecipientInfo)type, null, macAlg, contentStream));
            }
            else if (type instanceof KeyAgreeRecipientInfo)
            {
                infos.add(new KeyAgreeRecipientInformation(
                    (KeyAgreeRecipientInfo)type, null, macAlg, contentStream));
            }
            else if (type instanceof PasswordRecipientInfo)
            {
                infos.add(new PasswordRecipientInformation(
                    (PasswordRecipientInfo)type, null, macAlg, contentStream));
            }
        }

        this.authAttrs = authData.getAuthAttrs();
        this.recipientInfoStore = new RecipientInformationStore(infos);
        this.unauthAttrs = authData.getUnauthAttrs();
    }

    public byte[] getMac()
    {
        return Arrays.clone(mac);
    }

    private byte[] encodeObj(
        DEREncodable    obj)
        throws IOException
    {
        if (obj != null)
        {
            return obj.getDERObject().getEncoded();
        }

        return null;
    }

    /**
     * return the object identifier for the content MAC algorithm.
     */
    public String getMacAlgOID()
    {
        return macAlg.getObjectId().getId();
    }

    /**
     * return the ASN.1 encoded MAC algorithm parameters, or null if
     * there aren't any.
     */
    public byte[] getMacAlgParams()
    {
        try
        {
            return encodeObj(macAlg.getParameters());
        }
        catch (Exception e)
        {
            throw new RuntimeException("exception getting encryption parameters " + e);
        }
    }

    /**
     * Return an AlgorithmParameters object giving the MAC parameters
     * used to digest the message content.
     *
     * @param provider the provider to generate the parameters for.
     * @return the parameters object, null if there is not one.
     * @throws org.bouncycastle.cms.CMSException if the algorithm cannot be found, or the parameters can't be parsed.
     * @throws java.security.NoSuchProviderException if the provider cannot be found.
     */
    public AlgorithmParameters getMacAlgorithmParameters(
        String  provider)
    throws CMSException, NoSuchProviderException
    {
        return getMacAlgorithmParameters(CMSUtils.getProvider(provider));
    }

    /**
     * Return an AlgorithmParameters object giving the MAC parameters
     * used to digest the message content.
     *
     * @param provider the provider to generate the parameters for.
     * @return the parameters object, null if there is not one.
     * @throws org.bouncycastle.cms.CMSException if the algorithm cannot be found, or the parameters can't be parsed.
     */
    public AlgorithmParameters getMacAlgorithmParameters(
        Provider provider)
    throws CMSException
    {
        return CMSEnvelopedHelper.INSTANCE.getEncryptionAlgorithmParameters(getMacAlgOID(), getMacAlgParams(), provider);
    }

    /**
     * return a store of the intended recipients for this message
     */
    public RecipientInformationStore getRecipientInfos()
    {
        return recipientInfoStore;
    }

    /**
     * return the ContentInfo
     */
    public ContentInfo getContentInfo()
    {
        return contentInfo;
    }

    /**
     * return a table of the digested attributes indexed by
     * the OID of the attribute.
     */
    public AttributeTable getAuthAttrs()
    {
        if (authAttrs == null)
        {
            return null;
        }

        return new AttributeTable(authAttrs);
    }

    /**
     * return a table of the undigested attributes indexed by
     * the OID of the attribute.
     */
    public AttributeTable getUnauthAttrs()
    {
        if (unauthAttrs == null)
        {
            return null;
        }

        return new AttributeTable(unauthAttrs);
    }

    /**
     * return the ASN.1 encoded representation of this object.
     */
    public byte[] getEncoded()
        throws IOException
    {
        return contentInfo.getEncoded();
    }
}