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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Cms
{
/**
* containing class for an CMS Enveloped Data object
*/
public class CmsEnvelopedData
{
internal RecipientInformationStore recipientInfoStore;
internal ContentInfo contentInfo;
private AlgorithmIdentifier encAlg;
private Asn1Set unprotectedAttributes;
public CmsEnvelopedData(
byte[] envelopedData)
: this(CmsUtilities.ReadContentInfo(envelopedData))
{
}
public CmsEnvelopedData(
Stream envelopedData)
: this(CmsUtilities.ReadContentInfo(envelopedData))
{
}
public CmsEnvelopedData(
ContentInfo contentInfo)
{
this.contentInfo = contentInfo;
EnvelopedData envData = EnvelopedData.GetInstance(contentInfo.Content);
//
// read the recipients
//
Asn1Set recipientInfos = envData.RecipientInfos;
//
// read the encrypted content info
//
EncryptedContentInfo encInfo = envData.EncryptedContentInfo;
this.encAlg = encInfo.ContentEncryptionAlgorithm;
CmsReadable readable = new CmsProcessableByteArray(encInfo.EncryptedContent.GetOctets());
CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsEnvelopedSecureReadable(
this.encAlg, readable);
//
// build the RecipientInformationStore
//
this.recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(
recipientInfos, secureReadable);
this.unprotectedAttributes = envData.UnprotectedAttrs;
}
public AlgorithmIdentifier EncryptionAlgorithmID
{
get { return encAlg; }
}
/**
* return the object identifier for the content encryption algorithm.
*/
public string EncryptionAlgOid
{
get { return encAlg.Algorithm.Id; }
}
/**
* return a store of the intended recipients for this message
*/
public RecipientInformationStore GetRecipientInfos()
{
return recipientInfoStore;
}
/**
* return the ContentInfo
*/
public ContentInfo ContentInfo
{
get { return contentInfo; }
}
/**
* return a table of the unprotected attributes indexed by
* the OID of the attribute.
*/
public Asn1.Cms.AttributeTable GetUnprotectedAttributes()
{
if (unprotectedAttributes == null)
return null;
return new Asn1.Cms.AttributeTable(unprotectedAttributes);
}
/**
* return the ASN.1 encoded representation of this object.
*/
public byte[] GetEncoded()
{
return contentInfo.GetEncoded();
}
}
}
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