1 files changed, 82 insertions, 0 deletions
diff --git a/Crypto/src/asn1/x509/PrivateKeyUsagePeriod.cs b/Crypto/src/asn1/x509/PrivateKeyUsagePeriod.cs
new file mode 100644
index 000000000..ad2961eb0
--- /dev/null
+++ b/Crypto/src/asn1/x509/PrivateKeyUsagePeriod.cs
@@ -0,0 +1,82 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+	/// <remarks>
+	/// <pre>
+	/// PrivateKeyUsagePeriod ::= SEQUENCE
+	/// {
+	/// notBefore       [0]     GeneralizedTime OPTIONAL,
+	/// notAfter        [1]     GeneralizedTime OPTIONAL }
+	/// </pre>
+	/// </remarks>
+	public class PrivateKeyUsagePeriod
+		: Asn1Encodable
+	{
+		public static PrivateKeyUsagePeriod GetInstance(
+			object obj)
+		{
+			if (obj is PrivateKeyUsagePeriod)
+			{
+				return (PrivateKeyUsagePeriod) obj;
+			}
+
+			if (obj is Asn1Sequence)
+			{
+				return new PrivateKeyUsagePeriod((Asn1Sequence) obj);
+			}
+
+			if (obj is X509Extension)
+			{
+				return GetInstance(X509Extension.ConvertValueToObject((X509Extension) obj));
+			}
+
+			throw new ArgumentException("unknown object in GetInstance: " + obj.GetType().FullName, "obj");
+		}
+
+		private DerGeneralizedTime _notBefore, _notAfter;
+
+		private PrivateKeyUsagePeriod(
+			Asn1Sequence seq)
+		{
+			foreach (Asn1TaggedObject tObj in seq)
+			{
+				if (tObj.TagNo == 0)
+				{
+					_notBefore = DerGeneralizedTime.GetInstance(tObj, false);
+				}
+				else if (tObj.TagNo == 1)
+				{
+					_notAfter = DerGeneralizedTime.GetInstance(tObj, false);
+				}
+			}
+		}
+
+		public DerGeneralizedTime NotBefore
+		{
+			get { return _notBefore; }
+		}
+
+		public DerGeneralizedTime NotAfter
+		{
+			get { return _notAfter; }
+		}
+
+		public override Asn1Object ToAsn1Object()
+		{
+			Asn1EncodableVector v = new Asn1EncodableVector();
+
+			if (_notBefore != null)
+			{
+				v.Add(new DerTaggedObject(false, 0, _notBefore));
+			}
+
+			if (_notAfter != null)
+			{
+				v.Add(new DerTaggedObject(false, 1, _notAfter));
+			}
+
+			return new DerSequence(v);
+		}
+	}
+}