Imported Upstream version 4.3.2.467

Former-commit-id: 9c2cb47f45fa221e661ab616387c9cda183f283d

mcs/class/Mono.Security/Mono.Security.Interface/SecureBuffer.cs

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+//
+// SecureBuffer.cs
+//
+// Author:
+//       Martin Baulig <martin.baulig@xamarin.com>
+//
+// Copyright (c) 2014-2016 Xamarin Inc. (http://www.xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+
+namespace Mono.Security.Interface
+{
+	public class SecureBuffer : SecretParameters, IBufferOffsetSize
+	{
+		byte[] buffer;
+
+		public byte[] Buffer {
+			get {
+				CheckDisposed ();
+				return buffer;
+			}
+		}
+
+		public int Size {
+			get {
+				CheckDisposed ();
+				return buffer != null ? buffer.Length : 0;
+			}
+		}
+
+		int IBufferOffsetSize.Offset {
+			get { return 0; }
+		}
+
+		public SecureBuffer (int size)
+		{
+			buffer = new byte [size];
+		}
+
+		public SecureBuffer (byte[] buffer)
+		{
+			this.buffer = buffer;
+		}
+
+		public byte[] StealBuffer ()
+		{
+			CheckDisposed ();
+			var retval = this.buffer;
+			this.buffer = null;
+			return retval;
+		}
+
+		public static SecureBuffer CreateCopy (byte[] buffer)
+		{
+			var copy = new byte [buffer.Length];
+			Array.Copy (buffer, copy, buffer.Length);
+			return new SecureBuffer (copy);
+		}
+
+		protected override void Clear ()
+		{
+			if (buffer != null) {
+				Array.Clear (buffer, 0, buffer.Length);
+				buffer = null;
+			}
+		}
+	}
+}
+