Initial Commit

iTechSharp/srcbc/asn1/cms/EncryptedData.cs

@@ -0,0 +1,95 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+	public class EncryptedData
+		: Asn1Encodable
+	{
+		private readonly DerInteger				version;
+		private readonly EncryptedContentInfo	encryptedContentInfo;
+		private readonly Asn1Set				unprotectedAttrs;
+
+		public static EncryptedData GetInstance(
+			object obj)
+		{
+			if (obj is EncryptedData)
+				return (EncryptedData) obj;
+
+			if (obj is Asn1Sequence)
+				return new EncryptedData((Asn1Sequence) obj);
+
+			throw new ArgumentException("Invalid EncryptedData: " + obj.GetType().Name);
+		}
+
+		public EncryptedData(
+			EncryptedContentInfo encInfo)
+			: this(encInfo, null)
+		{
+		}
+
+		public EncryptedData(
+			EncryptedContentInfo	encInfo,
+			Asn1Set					unprotectedAttrs)
+		{
+			if (encInfo == null)
+				throw new ArgumentNullException("encInfo");
+
+			this.version = new DerInteger((unprotectedAttrs == null) ? 0 : 2);
+			this.encryptedContentInfo = encInfo;
+			this.unprotectedAttrs = unprotectedAttrs;
+		}
+
+		private EncryptedData(
+			Asn1Sequence seq)
+		{
+			if (seq == null)
+				throw new ArgumentNullException("seq");
+			if (seq.Count < 2 || seq.Count > 3)
+				throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");
+
+			this.version = DerInteger.GetInstance(seq[0]);
+			this.encryptedContentInfo = EncryptedContentInfo.GetInstance(seq[1]);
+
+			if (seq.Count > 2)
+			{
+				this.unprotectedAttrs = Asn1Set.GetInstance(seq[2]);
+			}
+		}
+
+		public virtual DerInteger Version
+		{
+			get { return version; }
+		}
+
+		public virtual EncryptedContentInfo EncryptedContentInfo
+		{
+			get { return encryptedContentInfo; }
+		}
+
+		public virtual Asn1Set UnprotectedAttrs
+		{
+			get { return unprotectedAttrs; }
+		}
+
+		/**
+		* <pre>
+		*       EncryptedData ::= SEQUENCE {
+		*                     version CMSVersion,
+		*                     encryptedContentInfo EncryptedContentInfo,
+		*                     unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }
+		* </pre>
+		* @return a basic ASN.1 object representation.
+		*/
+		public override Asn1Object ToAsn1Object()
+		{
+			Asn1EncodableVector v = new Asn1EncodableVector(version, encryptedContentInfo);
+
+			if (unprotectedAttrs != null)
+			{
+				v.Add(new BerTaggedObject(false, 1, unprotectedAttrs));
+			}
+
+			return new BerSequence(v);
+		}
+	}
+}