diff --git a/Crypto/src/asn1/ocsp/TBSRequest.cs b/Crypto/src/asn1/ocsp/TBSRequest.cs
new file mode 100644
index 000000000..6bf75eb96
--- /dev/null
+++ b/Crypto/src/asn1/ocsp/TBSRequest.cs
@@ -0,0 +1,151 @@
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+using System;
+
+namespace Org.BouncyCastle.Asn1.Ocsp
+{
+ public class TbsRequest
+ : Asn1Encodable
+ {
+ private static readonly DerInteger V1 = new DerInteger(0);
+
+ private readonly DerInteger version;
+ private readonly GeneralName requestorName;
+ private readonly Asn1Sequence requestList;
+ private readonly X509Extensions requestExtensions;
+
+ private bool versionSet;
+
+ public static TbsRequest GetInstance(
+ Asn1TaggedObject obj,
+ bool explicitly)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+ }
+
+ public static TbsRequest GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is TbsRequest)
+ {
+ return (TbsRequest)obj;
+ }
+
+ if (obj is Asn1Sequence)
+ {
+ return new TbsRequest((Asn1Sequence)obj);
+ }
+
+ throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+ }
+
+ public TbsRequest(
+ GeneralName requestorName,
+ Asn1Sequence requestList,
+ X509Extensions requestExtensions)
+ {
+ this.version = V1;
+ this.requestorName = requestorName;
+ this.requestList = requestList;
+ this.requestExtensions = requestExtensions;
+ }
+
+ private TbsRequest(
+ Asn1Sequence seq)
+ {
+ int index = 0;
+
+ Asn1Encodable enc = seq[0];
+ if (enc is Asn1TaggedObject)
+ {
+ Asn1TaggedObject o = (Asn1TaggedObject) enc;
+
+ if (o.TagNo == 0)
+ {
+ versionSet = true;
+ version = DerInteger.GetInstance(o, true);
+ index++;
+ }
+ else
+ {
+ version = V1;
+ }
+ }
+ else
+ {
+ version = V1;
+ }
+
+ if (seq[index] is Asn1TaggedObject)
+ {
+ requestorName = GeneralName.GetInstance((Asn1TaggedObject) seq[index++], true);
+ }
+
+ requestList = (Asn1Sequence) seq[index++];
+
+ if (seq.Count == (index + 1))
+ {
+ requestExtensions = X509Extensions.GetInstance((Asn1TaggedObject) seq[index], true);
+ }
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public GeneralName RequestorName
+ {
+ get { return requestorName; }
+ }
+
+ public Asn1Sequence RequestList
+ {
+ get { return requestList; }
+ }
+
+ public X509Extensions RequestExtensions
+ {
+ get { return requestExtensions; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * TBSRequest ::= Sequence {
+ * version [0] EXPLICIT Version DEFAULT v1,
+ * requestorName [1] EXPLICIT GeneralName OPTIONAL,
+ * requestList Sequence OF Request,
+ * requestExtensions [2] EXPLICIT Extensions OPTIONAL }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector();
+
+ //
+ // if default don't include - unless explicitly provided. Not strictly correct
+ // but required for some requests
+ //
+ if (!version.Equals(V1) || versionSet)
+ {
+ v.Add(new DerTaggedObject(true, 0, version));
+ }
+
+ if (requestorName != null)
+ {
+ v.Add(new DerTaggedObject(true, 1, requestorName));
+ }
+
+ v.Add(requestList);
+
+ if (requestExtensions != null)
+ {
+ v.Add(new DerTaggedObject(true, 2, requestExtensions));
+ }
+
+ return new DerSequence(v);
+ }
+ }
+}
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