1 files changed, 82 insertions, 0 deletions
diff --git a/crypto/src/asn1/LazyDERSet.cs b/crypto/src/asn1/LazyDERSet.cs
new file mode 100644
index 000000000..84fce4808
--- /dev/null
+++ b/crypto/src/asn1/LazyDERSet.cs
@@ -0,0 +1,82 @@
+using System;
+using System.Collections;
+using System.Diagnostics;
+
+namespace Org.BouncyCastle.Asn1
+{
+	internal class LazyDerSet
+		: DerSet
+	{
+		private byte[]	encoded;
+		private bool	parsed = false;
+
+		internal LazyDerSet(
+			byte[] encoded)
+		{
+			this.encoded = encoded;
+		}
+
+		private void Parse()
+		{
+			lock (this)
+			{
+				if (!parsed)
+				{
+					Asn1InputStream e = new LazyAsn1InputStream(encoded);
+
+					Asn1Object o;
+					while ((o = e.ReadObject()) != null)
+					{
+						AddObject(o);
+					}
+
+					encoded = null;
+					parsed = true;
+				}
+			}
+		}
+
+		public override Asn1Encodable this[int index]
+		{
+			get
+			{
+				Parse();
+
+				return base[index];
+			}
+		}
+
+		public override IEnumerator GetEnumerator()
+		{
+			Parse();
+
+			return base.GetEnumerator();
+		}
+
+		public override int Count
+		{
+			get
+			{
+				Parse();
+
+				return base.Count;
+			}
+		}
+
+		internal override void Encode(
+			DerOutputStream derOut)
+		{
+			lock (this)
+			{
+				if (parsed)
+				{
+					base.Encode(derOut);
+				}
+				else
+				{
+					derOut.WriteEncoded(Asn1Tags.Set | Asn1Tags.Constructed, encoded);
+				}
+			}
+		}
+	}
+}