1 files changed, 145 insertions, 0 deletions
diff --git a/Crypto/src/asn1/cms/AuthEnvelopedDataParser.cs b/Crypto/src/asn1/cms/AuthEnvelopedDataParser.cs
new file mode 100644
index 000000000..35cb3bfcc
--- /dev/null
+++ b/Crypto/src/asn1/cms/AuthEnvelopedDataParser.cs
@@ -0,0 +1,145 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+	/**
+	 * Produce an object suitable for an Asn1OutputStream.
+	 * 
+	 * <pre>
+	 * AuthEnvelopedData ::= SEQUENCE {
+	 *   version CMSVersion,
+	 *   originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
+	 *   recipientInfos RecipientInfos,
+	 *   authEncryptedContentInfo EncryptedContentInfo,
+	 *   authAttrs [1] IMPLICIT AuthAttributes OPTIONAL,
+	 *   mac MessageAuthenticationCode,
+	 *   unauthAttrs [2] IMPLICIT UnauthAttributes OPTIONAL }
+	 * </pre>
+	*/
+	public class AuthEnvelopedDataParser
+	{
+		private Asn1SequenceParser	seq;
+		private DerInteger			version;
+		private IAsn1Convertible	nextObject;
+		private bool				originatorInfoCalled;
+
+		public AuthEnvelopedDataParser(
+			Asn1SequenceParser	seq)
+		{
+			this.seq = seq;
+
+			// TODO
+			// "It MUST be set to 0."
+			this.version = (DerInteger)seq.ReadObject();
+		}
+
+		public DerInteger Version
+		{
+			get { return version; }
+		}
+
+		public OriginatorInfo GetOriginatorInfo()
+		{
+			originatorInfoCalled = true;
+
+			if (nextObject == null)
+			{
+				nextObject = seq.ReadObject();
+			}
+
+			if (nextObject is Asn1TaggedObjectParser && ((Asn1TaggedObjectParser)nextObject).TagNo == 0)
+			{
+				Asn1SequenceParser originatorInfo = (Asn1SequenceParser) ((Asn1TaggedObjectParser)nextObject).GetObjectParser(Asn1Tags.Sequence, false);
+				nextObject = null;
+				return OriginatorInfo.GetInstance(originatorInfo.ToAsn1Object());
+			}
+
+			return null;
+		}
+
+		public Asn1SetParser GetRecipientInfos()
+		{
+			if (!originatorInfoCalled)
+			{
+				GetOriginatorInfo();
+			}
+
+			if (nextObject == null)
+			{
+				nextObject = seq.ReadObject();
+			}
+
+			Asn1SetParser recipientInfos = (Asn1SetParser)nextObject;
+			nextObject = null;
+			return recipientInfos;
+		}
+
+		public EncryptedContentInfoParser GetAuthEncryptedContentInfo() 
+		{
+			if (nextObject == null)
+			{
+				nextObject = seq.ReadObject();
+			}
+
+			if (nextObject != null)
+			{
+				Asn1SequenceParser o = (Asn1SequenceParser) nextObject;
+				nextObject = null;
+				return new EncryptedContentInfoParser(o);
+			}
+
+			return null;
+		}
+		
+		public Asn1SetParser GetAuthAttrs()
+		{
+			if (nextObject == null)
+			{
+				nextObject = seq.ReadObject();
+			}
+
+			if (nextObject is Asn1TaggedObjectParser)
+			{
+				IAsn1Convertible o = nextObject;
+				nextObject = null;
+				return (Asn1SetParser)((Asn1TaggedObjectParser)o).GetObjectParser(Asn1Tags.Set, false);
+			}
+
+			// TODO
+			// "The authAttrs MUST be present if the content type carried in
+			// EncryptedContentInfo is not id-data."
+
+			return null;
+		}
+		
+		public Asn1OctetString GetMac()
+		{
+			if (nextObject == null)
+			{
+				nextObject = seq.ReadObject();
+			}
+
+			IAsn1Convertible o = nextObject;
+			nextObject = null;
+
+			return Asn1OctetString.GetInstance(o.ToAsn1Object());
+		}
+		
+		public Asn1SetParser GetUnauthAttrs()
+		{
+			if (nextObject == null)
+			{
+				nextObject = seq.ReadObject();
+			}
+
+			if (nextObject != null)
+			{
+				IAsn1Convertible o = nextObject;
+				nextObject = null;
+				return (Asn1SetParser)((Asn1TaggedObjectParser)o).GetObjectParser(Asn1Tags.Set, false);
+			}
+
+			return null;
+		}
+	}
+}