From 176743ab5faec2dd275b5efd3a2dd62c610f237a Mon Sep 17 00:00:00 2001
From: Oren Novotny <oren@novotny.org>
Date: Wed, 26 Feb 2014 10:08:50 -0500
Subject: Add BouncyCastle PCL files

---
 Crypto/src/cms/CMSAuthenticatedDataParser.cs | 214 +++++++++++++++++++++++++++
 1 file changed, 214 insertions(+)
 create mode 100644 Crypto/src/cms/CMSAuthenticatedDataParser.cs

(limited to 'Crypto/src/cms/CMSAuthenticatedDataParser.cs')

diff --git a/Crypto/src/cms/CMSAuthenticatedDataParser.cs b/Crypto/src/cms/CMSAuthenticatedDataParser.cs
new file mode 100644
index 000000000..c99aac61c
--- /dev/null
+++ b/Crypto/src/cms/CMSAuthenticatedDataParser.cs
@@ -0,0 +1,214 @@
+using System;
+using System.Collections;
+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.ObjectID.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)
+				{
+					Asn1EncodableVector v = new Asn1EncodableVector();
+
+					IAsn1Convertible o;
+					while ((o = s.ReadObject()) != null)
+					{
+						Asn1SequenceParser seq = (Asn1SequenceParser)o;
+
+						v.Add(seq.ToAsn1Object());
+					}
+
+					authAttrs = new Asn1.Cms.AttributeTable(new DerSet(v));
+				}
+			}
+
+			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)
+				{
+					Asn1EncodableVector v = new Asn1EncodableVector();
+
+					IAsn1Convertible o;
+					while ((o = s.ReadObject()) != null)
+					{
+						Asn1SequenceParser seq = (Asn1SequenceParser)o;
+
+						v.Add(seq.ToAsn1Object());
+					}
+
+					unauthAttrs = new Asn1.Cms.AttributeTable(new DerSet(v));
+				}
+			}
+
+			return unauthAttrs;
+		}
+	}
+}
-- 
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