diff --git a/Crypto/src/asn1/ocsp/SingleResponse.cs b/Crypto/src/asn1/ocsp/SingleResponse.cs
new file mode 100644
index 000000000..93d4c21d6
--- /dev/null
+++ b/Crypto/src/asn1/ocsp/SingleResponse.cs
@@ -0,0 +1,137 @@
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+using System;
+
+namespace Org.BouncyCastle.Asn1.Ocsp
+{
+ public class SingleResponse
+ : Asn1Encodable
+ {
+ private readonly CertID certID;
+ private readonly CertStatus certStatus;
+ private readonly DerGeneralizedTime thisUpdate;
+ private readonly DerGeneralizedTime nextUpdate;
+ private readonly X509Extensions singleExtensions;
+
+ public SingleResponse(
+ CertID certID,
+ CertStatus certStatus,
+ DerGeneralizedTime thisUpdate,
+ DerGeneralizedTime nextUpdate,
+ X509Extensions singleExtensions)
+ {
+ this.certID = certID;
+ this.certStatus = certStatus;
+ this.thisUpdate = thisUpdate;
+ this.nextUpdate = nextUpdate;
+ this.singleExtensions = singleExtensions;
+ }
+
+ public SingleResponse(
+ Asn1Sequence seq)
+ {
+ this.certID = CertID.GetInstance(seq[0]);
+ this.certStatus = CertStatus.GetInstance(seq[1]);
+ this.thisUpdate = (DerGeneralizedTime)seq[2];
+
+ if (seq.Count > 4)
+ {
+ this.nextUpdate = DerGeneralizedTime.GetInstance(
+ (Asn1TaggedObject) seq[3], true);
+ this.singleExtensions = X509Extensions.GetInstance(
+ (Asn1TaggedObject) seq[4], true);
+ }
+ else if (seq.Count > 3)
+ {
+ Asn1TaggedObject o = (Asn1TaggedObject) seq[3];
+
+ if (o.TagNo == 0)
+ {
+ this.nextUpdate = DerGeneralizedTime.GetInstance(o, true);
+ }
+ else
+ {
+ this.singleExtensions = X509Extensions.GetInstance(o, true);
+ }
+ }
+ }
+
+ public static SingleResponse GetInstance(
+ Asn1TaggedObject obj,
+ bool explicitly)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+ }
+
+ public static SingleResponse GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is SingleResponse)
+ {
+ return (SingleResponse)obj;
+ }
+
+ if (obj is Asn1Sequence)
+ {
+ return new SingleResponse((Asn1Sequence)obj);
+ }
+
+ throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+ }
+
+ public CertID CertId
+ {
+ get { return certID; }
+ }
+
+ public CertStatus CertStatus
+ {
+ get { return certStatus; }
+ }
+
+ public DerGeneralizedTime ThisUpdate
+ {
+ get { return thisUpdate; }
+ }
+
+ public DerGeneralizedTime NextUpdate
+ {
+ get { return nextUpdate; }
+ }
+
+ public X509Extensions SingleExtensions
+ {
+ get { return singleExtensions; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * SingleResponse ::= Sequence {
+ * certID CertID,
+ * certStatus CertStatus,
+ * thisUpdate GeneralizedTime,
+ * nextUpdate [0] EXPLICIT GeneralizedTime OPTIONAL,
+ * singleExtensions [1] EXPLICIT Extensions OPTIONAL }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(
+ certID, certStatus, thisUpdate);
+
+ if (nextUpdate != null)
+ {
+ v.Add(new DerTaggedObject(true, 0, nextUpdate));
+ }
+
+ if (singleExtensions != null)
+ {
+ v.Add(new DerTaggedObject(true, 1, singleExtensions));
+ }
+
+ return new DerSequence(v);
+ }
+ }
+}
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