1 files changed, 64 insertions, 0 deletions
diff --git a/Crypto/src/asn1/crmf/OptionalValidity.cs b/Crypto/src/asn1/crmf/OptionalValidity.cs
new file mode 100644
index 000000000..c0037999a
--- /dev/null
+++ b/Crypto/src/asn1/crmf/OptionalValidity.cs
@@ -0,0 +1,64 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Crmf
+{
+    public class OptionalValidity
+        : Asn1Encodable
+    {
+        private readonly Time notBefore;
+        private readonly Time notAfter;
+
+        private OptionalValidity(Asn1Sequence seq)
+        {
+            foreach (Asn1TaggedObject tObj in seq)
+            {
+                if (tObj.TagNo == 0)
+                {
+                    notBefore = Time.GetInstance(tObj, true);
+                }
+                else
+                {
+                    notAfter = Time.GetInstance(tObj, true);
+                }
+            }
+        }
+
+        public static OptionalValidity GetInstance(object obj)
+        {
+            if (obj is OptionalValidity)
+                return (OptionalValidity)obj;
+
+            if (obj is Asn1Sequence)
+                return new OptionalValidity((Asn1Sequence)obj);
+
+            throw new ArgumentException("Invalid object: " + obj.GetType().Name, "obj");
+        }
+
+        /**
+         * <pre>
+         * OptionalValidity ::= SEQUENCE {
+         *                        notBefore  [0] Time OPTIONAL,
+         *                        notAfter   [1] Time OPTIONAL } --at least one MUST be present
+         * </pre>
+         * @return a basic ASN.1 object representation.
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+            Asn1EncodableVector v = new Asn1EncodableVector();
+
+            if (notBefore != null)
+            {
+                v.Add(new DerTaggedObject(true, 0, notBefore));
+            }
+
+            if (notAfter != null)
+            {
+                v.Add(new DerTaggedObject(true, 1, notAfter));
+            }
+
+            return new DerSequence(v);
+        }
+    }
+}