1 files changed, 99 insertions, 0 deletions
diff --git a/crypto/src/util/collections/HashSet.cs b/crypto/src/util/collections/HashSet.cs
new file mode 100644
index 000000000..1facb58e3
--- /dev/null
+++ b/crypto/src/util/collections/HashSet.cs
@@ -0,0 +1,99 @@
+using System;
+using System.Collections;
+
+namespace Org.BouncyCastle.Utilities.Collections
+{
+	public class HashSet
+		: ISet
+	{
+		private readonly IDictionary impl = Platform.CreateHashtable();
+
+		public HashSet()
+		{
+		}
+
+		public HashSet(IEnumerable s)
+		{
+			foreach (object o in s)
+			{
+				Add(o);
+			}
+		}
+
+		public virtual void Add(object o)
+		{
+			impl[o] = null;
+		}
+
+		public virtual void AddAll(IEnumerable e)
+		{
+			foreach (object o in e)
+			{
+				Add(o);
+			}
+		}
+
+		public virtual void Clear()
+		{
+			impl.Clear();
+		}
+
+		public virtual bool Contains(object o)
+		{
+			return impl.Contains(o);
+		}
+
+		public virtual void CopyTo(Array array, int index)
+		{
+			impl.Keys.CopyTo(array, index);
+		}
+
+		public virtual int Count
+		{
+			get { return impl.Count; }
+		}
+
+		public virtual IEnumerator GetEnumerator()
+		{
+			return impl.Keys.GetEnumerator();
+		}
+
+		public virtual bool IsEmpty
+		{
+			get { return impl.Count == 0; }
+		}
+
+		public virtual bool IsFixedSize
+		{
+			get { return impl.IsFixedSize; }
+		}
+
+		public virtual bool IsReadOnly
+		{
+			get { return impl.IsReadOnly; }
+		}
+
+		public virtual bool IsSynchronized
+		{
+			get { return impl.IsSynchronized; }
+		}
+
+		public virtual void Remove(object o)
+		{
+			impl.Remove(o);
+		}
+
+		public virtual void RemoveAll(IEnumerable e)
+		{
+			foreach (object o in e)
+			{
+				Remove(o);
+			}
+		}
+
+		public virtual object SyncRoot
+		{
+			get { return impl.SyncRoot; }
+		}
+	}
+}