diff --git a/Crypto/src/asn1/cms/EnvelopedData.cs b/Crypto/src/asn1/cms/EnvelopedData.cs
new file mode 100644
index 000000000..47cd4a9f5
--- /dev/null
+++ b/Crypto/src/asn1/cms/EnvelopedData.cs
@@ -0,0 +1,167 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+ public class EnvelopedData
+ : Asn1Encodable
+ {
+ private DerInteger version;
+ private OriginatorInfo originatorInfo;
+ private Asn1Set recipientInfos;
+ private EncryptedContentInfo encryptedContentInfo;
+ private Asn1Set unprotectedAttrs;
+
+ public EnvelopedData(
+ OriginatorInfo originatorInfo,
+ Asn1Set recipientInfos,
+ EncryptedContentInfo encryptedContentInfo,
+ Asn1Set unprotectedAttrs)
+ {
+ if (originatorInfo != null || unprotectedAttrs != null)
+ {
+ version = new DerInteger(2);
+ }
+ else
+ {
+ version = new DerInteger(0);
+
+ foreach (object o in recipientInfos)
+ {
+ RecipientInfo ri = RecipientInfo.GetInstance(o);
+
+ if (!ri.Version.Equals(version))
+ {
+ version = new DerInteger(2);
+ break;
+ }
+ }
+ }
+
+ this.originatorInfo = originatorInfo;
+ this.recipientInfos = recipientInfos;
+ this.encryptedContentInfo = encryptedContentInfo;
+ this.unprotectedAttrs = unprotectedAttrs;
+ }
+
+ public EnvelopedData(
+ Asn1Sequence seq)
+ {
+ int index = 0;
+
+ version = (DerInteger) seq[index++];
+
+ object tmp = seq[index++];
+
+ if (tmp is Asn1TaggedObject)
+ {
+ originatorInfo = OriginatorInfo.GetInstance((Asn1TaggedObject) tmp, false);
+ tmp = seq[index++];
+ }
+
+ recipientInfos = Asn1Set.GetInstance(tmp);
+ encryptedContentInfo = EncryptedContentInfo.GetInstance(seq[index++]);
+
+ if (seq.Count > index)
+ {
+ unprotectedAttrs = Asn1Set.GetInstance((Asn1TaggedObject) seq[index], false);
+ }
+ }
+
+ /**
+ * return an EnvelopedData object from a tagged object.
+ *
+ * @param obj the tagged object holding the object we want.
+ * @param explicitly true if the object is meant to be explicitly
+ * tagged false otherwise.
+ * @exception ArgumentException if the object held by the
+ * tagged object cannot be converted.
+ */
+ public static EnvelopedData GetInstance(
+ Asn1TaggedObject obj,
+ bool explicitly)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+ }
+
+ /**
+ * return an EnvelopedData object from the given object.
+ *
+ * @param obj the object we want converted.
+ * @exception ArgumentException if the object cannot be converted.
+ */
+ public static EnvelopedData GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is EnvelopedData)
+ {
+ return (EnvelopedData)obj;
+ }
+
+ if (obj is Asn1Sequence)
+ {
+ return new EnvelopedData((Asn1Sequence)obj);
+ }
+
+ throw new ArgumentException("Invalid EnvelopedData: " + obj.GetType().Name);
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public OriginatorInfo OriginatorInfo
+ {
+ get { return originatorInfo; }
+ }
+
+ public Asn1Set RecipientInfos
+ {
+ get { return recipientInfos; }
+ }
+
+ public EncryptedContentInfo EncryptedContentInfo
+ {
+ get { return encryptedContentInfo; }
+ }
+
+ public Asn1Set UnprotectedAttrs
+ {
+ get { return unprotectedAttrs; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * EnvelopedData ::= Sequence {
+ * version CMSVersion,
+ * originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
+ * recipientInfos RecipientInfos,
+ * encryptedContentInfo EncryptedContentInfo,
+ * unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL
+ * }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(version);
+
+ if (originatorInfo != null)
+ {
+ v.Add(new DerTaggedObject(false, 0, originatorInfo));
+ }
+
+ v.Add(recipientInfos, encryptedContentInfo);
+
+ if (unprotectedAttrs != null)
+ {
+ v.Add(new DerTaggedObject(false, 1, unprotectedAttrs));
+ }
+
+ return new BerSequence(v);
+ }
+ }
+}
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