1 files changed, 38 insertions, 0 deletions
diff --git a/crypto/src/asn1/DerEncoding.cs b/crypto/src/asn1/DerEncoding.cs
new file mode 100644
index 000000000..8de808d8c
--- /dev/null
+++ b/crypto/src/asn1/DerEncoding.cs
@@ -0,0 +1,38 @@
+using System;
+using System.Diagnostics;
+
+namespace Org.BouncyCastle.Asn1
+{
+    internal abstract class DerEncoding
+        : IAsn1Encoding, IComparable<DerEncoding>
+    {
+        protected internal readonly int m_tagClass;
+        protected internal readonly int m_tagNo;
+
+        protected internal DerEncoding(int tagClass, int tagNo)
+        {
+            Debug.Assert((tagClass & Asn1Tags.Private) == tagClass);
+            Debug.Assert(tagNo >= 0);
+            m_tagClass = tagClass;
+            m_tagNo = tagNo;
+        }
+
+        protected internal abstract int CompareLengthAndContents(DerEncoding other);
+
+        public int CompareTo(DerEncoding other)
+        {
+            Debug.Assert(other != null);
+            if (other == null)
+                return 1;
+            if (m_tagClass != other.m_tagClass)
+                return m_tagClass - other.m_tagClass;
+            if (m_tagNo != other.m_tagNo)
+                return m_tagNo - other.m_tagNo;
+            return CompareLengthAndContents(other);
+        }
+
+        public abstract void Encode(Asn1OutputStream asn1Out);
+
+        public abstract int GetLength();
+    }
+}