diff --git a/Crypto/src/asn1/tsp/TSTInfo.cs b/Crypto/src/asn1/tsp/TSTInfo.cs
new file mode 100644
index 000000000..61d5399c7
--- /dev/null
+++ b/Crypto/src/asn1/tsp/TSTInfo.cs
@@ -0,0 +1,249 @@
+using System;
+using System.Collections;
+using System.IO;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Tsp
+{
+ public class TstInfo
+ : Asn1Encodable
+ {
+ private readonly DerInteger version;
+ private readonly DerObjectIdentifier tsaPolicyId;
+ private readonly MessageImprint messageImprint;
+ private readonly DerInteger serialNumber;
+ private readonly DerGeneralizedTime genTime;
+ private readonly Accuracy accuracy;
+ private readonly DerBoolean ordering;
+ private readonly DerInteger nonce;
+ private readonly GeneralName tsa;
+ private readonly X509Extensions extensions;
+
+ public static TstInfo GetInstance(
+ object o)
+ {
+ if (o == null || o is TstInfo)
+ {
+ return (TstInfo) o;
+ }
+
+ if (o is Asn1Sequence)
+ {
+ return new TstInfo((Asn1Sequence) o);
+ }
+
+ if (o is Asn1OctetString)
+ {
+ try
+ {
+ byte[] octets = ((Asn1OctetString)o).GetOctets();
+ return GetInstance(Asn1Object.FromByteArray(octets));
+ }
+ catch (IOException)
+ {
+ throw new ArgumentException(
+ "Bad object format in 'TstInfo' factory.");
+ }
+ }
+
+ throw new ArgumentException(
+ "Unknown object in 'TstInfo' factory: " + o.GetType().FullName);
+ }
+
+ private TstInfo(
+ Asn1Sequence seq)
+ {
+ IEnumerator e = seq.GetEnumerator();
+
+ // version
+ e.MoveNext();
+ version = DerInteger.GetInstance(e.Current);
+
+ // tsaPolicy
+ e.MoveNext();
+ tsaPolicyId = DerObjectIdentifier.GetInstance(e.Current);
+
+ // messageImprint
+ e.MoveNext();
+ messageImprint = MessageImprint.GetInstance(e.Current);
+
+ // serialNumber
+ e.MoveNext();
+ serialNumber = DerInteger.GetInstance(e.Current);
+
+ // genTime
+ e.MoveNext();
+ genTime = DerGeneralizedTime.GetInstance(e.Current);
+
+ // default for ordering
+ ordering = DerBoolean.False;
+
+ while (e.MoveNext())
+ {
+ Asn1Object o = (Asn1Object) e.Current;
+
+ if (o is Asn1TaggedObject)
+ {
+ DerTaggedObject tagged = (DerTaggedObject) o;
+
+ switch (tagged.TagNo)
+ {
+ case 0:
+ tsa = GeneralName.GetInstance(tagged, true);
+ break;
+ case 1:
+ extensions = X509Extensions.GetInstance(tagged, false);
+ break;
+ default:
+ throw new ArgumentException("Unknown tag value " + tagged.TagNo);
+ }
+ }
+
+ if (o is DerSequence)
+ {
+ accuracy = Accuracy.GetInstance(o);
+ }
+
+ if (o is DerBoolean)
+ {
+ ordering = DerBoolean.GetInstance(o);
+ }
+
+ if (o is DerInteger)
+ {
+ nonce = DerInteger.GetInstance(o);
+ }
+ }
+ }
+
+ public TstInfo(
+ DerObjectIdentifier tsaPolicyId,
+ MessageImprint messageImprint,
+ DerInteger serialNumber,
+ DerGeneralizedTime genTime,
+ Accuracy accuracy,
+ DerBoolean ordering,
+ DerInteger nonce,
+ GeneralName tsa,
+ X509Extensions extensions)
+ {
+ this.version = new DerInteger(1);
+ this.tsaPolicyId = tsaPolicyId;
+ this.messageImprint = messageImprint;
+ this.serialNumber = serialNumber;
+ this.genTime = genTime;
+ this.accuracy = accuracy;
+ this.ordering = ordering;
+ this.nonce = nonce;
+ this.tsa = tsa;
+ this.extensions = extensions;
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public MessageImprint MessageImprint
+ {
+ get { return messageImprint; }
+ }
+
+ public DerObjectIdentifier Policy
+ {
+ get { return tsaPolicyId; }
+ }
+
+ public DerInteger SerialNumber
+ {
+ get { return serialNumber; }
+ }
+
+ public Accuracy Accuracy
+ {
+ get { return accuracy; }
+ }
+
+ public DerGeneralizedTime GenTime
+ {
+ get { return genTime; }
+ }
+
+ public DerBoolean Ordering
+ {
+ get { return ordering; }
+ }
+
+ public DerInteger Nonce
+ {
+ get { return nonce; }
+ }
+
+ public GeneralName Tsa
+ {
+ get { return tsa; }
+ }
+
+ public X509Extensions Extensions
+ {
+ get { return extensions; }
+ }
+
+ /**
+ * <pre>
+ *
+ * TstInfo ::= SEQUENCE {
+ * version INTEGER { v1(1) },
+ * policy TSAPolicyId,
+ * messageImprint MessageImprint,
+ * -- MUST have the same value as the similar field in
+ * -- TimeStampReq
+ * serialNumber INTEGER,
+ * -- Time-Stamping users MUST be ready to accommodate integers
+ * -- up to 160 bits.
+ * genTime GeneralizedTime,
+ * accuracy Accuracy OPTIONAL,
+ * ordering BOOLEAN DEFAULT FALSE,
+ * nonce INTEGER OPTIONAL,
+ * -- MUST be present if the similar field was present
+ * -- in TimeStampReq. In that case it MUST have the same value.
+ * tsa [0] GeneralName OPTIONAL,
+ * extensions [1] IMPLICIT Extensions OPTIONAL }
+ *
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(
+ version, tsaPolicyId, messageImprint, serialNumber, genTime);
+
+ if (accuracy != null)
+ {
+ v.Add(accuracy);
+ }
+
+ if (ordering != null && ordering.IsTrue)
+ {
+ v.Add(ordering);
+ }
+
+ if (nonce != null)
+ {
+ v.Add(nonce);
+ }
+
+ if (tsa != null)
+ {
+ v.Add(new DerTaggedObject(true, 0, tsa));
+ }
+
+ if (extensions != null)
+ {
+ v.Add(new DerTaggedObject(false, 1, extensions));
+ }
+
+ return new DerSequence(v);
+ }
+ }
+}
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