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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Cms
{
/**
* Parsing class for an CMS Authenticated Data object from an input stream.
* <p>
* Note: that because we are in a streaming mode only one recipient can be tried and it is important
* that the methods on the parser are called in the appropriate order.
* </p>
* <p>
* Example of use - assuming the first recipient matches the private key we have.
* <pre>
* CMSAuthenticatedDataParser ad = new CMSAuthenticatedDataParser(inputStream);
*
* RecipientInformationStore recipients = ad.getRecipientInfos();
*
* Collection c = recipients.getRecipients();
* Iterator it = c.iterator();
*
* if (it.hasNext())
* {
* RecipientInformation recipient = (RecipientInformation)it.next();
*
* CMSTypedStream recData = recipient.getContentStream(privateKey, "BC");
*
* processDataStream(recData.getContentStream());
*
* if (!Arrays.equals(ad.getMac(), recipient.getMac())
* {
* System.err.println("Data corrupted!!!!");
* }
* }
* </pre>
* Note: this class does not introduce buffering - if you are processing large files you should create
* the parser with:
* <pre>
* CMSAuthenticatedDataParser ep = new CMSAuthenticatedDataParser(new BufferedInputStream(inputStream, bufSize));
* </pre>
* where bufSize is a suitably large buffer size.
* </p>
*/
public class CmsAuthenticatedDataParser
: CmsContentInfoParser
{
internal RecipientInformationStore _recipientInfoStore;
internal AuthenticatedDataParser authData;
private AlgorithmIdentifier macAlg;
private byte[] mac;
private Asn1.Cms.AttributeTable authAttrs;
private Asn1.Cms.AttributeTable unauthAttrs;
private bool authAttrNotRead;
private bool unauthAttrNotRead;
public CmsAuthenticatedDataParser(
byte[] envelopedData)
: this(new MemoryStream(envelopedData, false))
{
}
public CmsAuthenticatedDataParser(
Stream envelopedData)
: base(envelopedData)
{
this.authAttrNotRead = true;
this.authData = new AuthenticatedDataParser(
(Asn1SequenceParser)contentInfo.GetContent(Asn1Tags.Sequence));
// TODO Validate version?
//DerInteger version = this.authData.getVersion();
//
// read the recipients
//
Asn1Set recipientInfos = Asn1Set.GetInstance(authData.GetRecipientInfos().ToAsn1Object());
this.macAlg = authData.GetMacAlgorithm();
//
// read the authenticated content info
//
ContentInfoParser data = authData.GetEnapsulatedContentInfo();
CmsReadable readable = new CmsProcessableInputStream(
((Asn1OctetStringParser)data.GetContent(Asn1Tags.OctetString)).GetOctetStream());
CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsAuthenticatedSecureReadable(
this.macAlg, readable);
//
// build the RecipientInformationStore
//
this._recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(
recipientInfos, secureReadable);
}
public AlgorithmIdentifier MacAlgorithmID
{
get { return macAlg; }
}
/**
* return the object identifier for the mac algorithm.
*/
public string MacAlgOid
{
get { return macAlg.Algorithm.Id; }
}
/**
* return the ASN.1 encoded encryption algorithm parameters, or null if
* there aren't any.
*/
public Asn1Object MacAlgParams
{
get
{
Asn1Encodable ae = macAlg.Parameters;
return ae == null ? null : ae.ToAsn1Object();
}
}
/**
* return a store of the intended recipients for this message
*/
public RecipientInformationStore GetRecipientInfos()
{
return _recipientInfoStore;
}
public byte[] GetMac()
{
if (mac == null)
{
GetAuthAttrs();
mac = authData.GetMac().GetOctets();
}
return Arrays.Clone(mac);
}
/**
* return a table of the unauthenticated attributes indexed by
* the OID of the attribute.
* @exception java.io.IOException
*/
public Asn1.Cms.AttributeTable GetAuthAttrs()
{
if (authAttrs == null && authAttrNotRead)
{
Asn1SetParser s = authData.GetAuthAttrs();
authAttrNotRead = false;
if (s != null)
{
authAttrs = CmsUtilities.ParseAttributeTable(s);
}
}
return authAttrs;
}
/**
* return a table of the unauthenticated attributes indexed by
* the OID of the attribute.
* @exception java.io.IOException
*/
public Asn1.Cms.AttributeTable GetUnauthAttrs()
{
if (unauthAttrs == null && unauthAttrNotRead)
{
Asn1SetParser s = authData.GetUnauthAttrs();
unauthAttrNotRead = false;
if (s != null)
{
unauthAttrs = CmsUtilities.ParseAttributeTable(s);
}
}
return unauthAttrs;
}
}
}
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