Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/corlib/CommonCrypto/CorlibExtras.cs

@@ -0,0 +1,24 @@
+//
+// CorlibExtras.cs: additional stuff not provided by autogenerated code
+//
+// Authors:
+//	Sebastien Pouliot (sebastien@xamarun.com)
+//
+// Copyright (C) 2012 Xamarin Inc. All rights reserved.
+//
+
+namespace System.Security.Cryptography {
+	
+	// required to ensure compatibility with MS implementation
+	public sealed partial class RC2CryptoServiceProvider : RC2 {
+		
+		public override int EffectiveKeySize {
+			get { return base.EffectiveKeySize; }
+			set {
+				if (value != KeySizeValue)
+					throw new CryptographicUnexpectedOperationException ("Effective key size must match key size for compatibility");
+				base.EffectiveKeySize = value; 
+			}
+		}
+	}
+}