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package org.bouncycastle.cms;

import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.EncryptedContentInfo;
import org.bouncycastle.asn1.cms.EnvelopedData;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Encodable;

/**
 * containing class for an CMS Enveloped Data object
 * 

* Example of use - assuming the first recipient matches the private key we have. *

 *      CMSEnvelopedData     ed = new CMSEnvelopedData(inputStream);
 *
 *      RecipientInformationStore  recipients = ed.getRecipientInfos();
 *
 *      Collection  c = recipients.getRecipients();
 *      Iterator    it = c.iterator();
 *
 *      if (it.hasNext())
 *      {
 *          RecipientInformation   recipient = (RecipientInformation)it.next();
 *
 *          byte[] recData = recipient.getContent(new JceKeyTransEnvelopedRecipient(privateKey).setProvider("BC"));
 *
 *          processData(recData);
 *      }
 *  
*/ public class CMSEnvelopedData implements Encodable { RecipientInformationStore recipientInfoStore; ContentInfo contentInfo; private AlgorithmIdentifier encAlg; private ASN1Set unprotectedAttributes; private OriginatorInformation originatorInfo; public CMSEnvelopedData( byte[] envelopedData) throws CMSException { this(CMSUtils.readContentInfo(envelopedData)); } public CMSEnvelopedData( InputStream envelopedData) throws CMSException { this(CMSUtils.readContentInfo(envelopedData)); } /** * Construct a CMSEnvelopedData object from a content info object. * * @param contentInfo the contentInfo containing the CMS EnvelopedData object. * @throws CMSException in the case where malformed content is encountered. */ public CMSEnvelopedData( ContentInfo contentInfo) throws CMSException { this.contentInfo = contentInfo; try { EnvelopedData envData = EnvelopedData.getInstance(contentInfo.getContent()); if (envData.getOriginatorInfo() != null) { originatorInfo = new OriginatorInformation(envData.getOriginatorInfo()); } // // read the recipients // ASN1Set recipientInfos = envData.getRecipientInfos(); // // read the encrypted content info // EncryptedContentInfo encInfo = envData.getEncryptedContentInfo(); this.encAlg = encInfo.getContentEncryptionAlgorithm(); CMSReadable readable = new CMSProcessableByteArray(encInfo.getEncryptedContent().getOctets()); CMSSecureReadable secureReadable = new CMSEnvelopedHelper.CMSEnvelopedSecureReadable( this.encAlg, readable); // // build the RecipientInformationStore // this.recipientInfoStore = CMSEnvelopedHelper.buildRecipientInformationStore( recipientInfos, this.encAlg, secureReadable); this.unprotectedAttributes = envData.getUnprotectedAttrs(); } catch (ClassCastException e) { throw new CMSException("Malformed content.", e); } catch (IllegalArgumentException e) { throw new CMSException("Malformed content.", e); } } private byte[] encodeObj( ASN1Encodable obj) throws IOException { if (obj != null) { return obj.toASN1Primitive().getEncoded(); } return null; } /** * Return the originator information associated with this message if present. * * @return OriginatorInformation, null if not present. */ public OriginatorInformation getOriginatorInfo() { return originatorInfo; } /** * Return the content encryption algorithm details for the data in this object. * * @return AlgorithmIdentifier representing the content encryption algorithm. */ public AlgorithmIdentifier getContentEncryptionAlgorithm() { return encAlg; } /** * return the object identifier for the content encryption algorithm. */ public String getEncryptionAlgOID() { return encAlg.getAlgorithm().getId(); } /** * return the ASN.1 encoded encryption algorithm parameters, or null if * there aren't any. */ public byte[] getEncryptionAlgParams() { try { return encodeObj(encAlg.getParameters()); } catch (Exception e) { throw new RuntimeException("exception getting encryption parameters " + e); } } /** * return a store of the intended recipients for this message */ public RecipientInformationStore getRecipientInfos() { return recipientInfoStore; } /** * return the ContentInfo */ public ContentInfo toASN1Structure() { return contentInfo; } /** * return a table of the unprotected attributes indexed by * the OID of the attribute. */ public AttributeTable getUnprotectedAttributes() { if (unprotectedAttributes == null) { return null; } return new AttributeTable(unprotectedAttributes); } /** * return the ASN.1 encoded representation of this object. */ public byte[] getEncoded() throws IOException { return contentInfo.getEncoded(); } }




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