Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.IdentityModel/System/IdentityModel/StandardTransformFactory.cs

@@ -0,0 +1,41 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.IdentityModel
+{
+    using System.IdentityModel.Tokens;
+    using System.Security.Cryptography;
+
+    class StandardTransformFactory : TransformFactory
+    {
+        static StandardTransformFactory instance = new StandardTransformFactory();
+
+        protected StandardTransformFactory() { }
+
+        internal static StandardTransformFactory Instance
+        {
+            get { return instance; }
+        }
+
+        public override Transform CreateTransform(string transformAlgorithmUri)
+        {
+            if (transformAlgorithmUri == SecurityAlgorithms.ExclusiveC14n)
+            {
+                return new ExclusiveCanonicalizationTransform();
+            }
+            else if (transformAlgorithmUri == SecurityAlgorithms.ExclusiveC14nWithComments)
+            {
+                return new ExclusiveCanonicalizationTransform(false, true);
+            }
+            else if (transformAlgorithmUri == SecurityAlgorithms.StrTransform)
+            {
+                return new StrTransform();
+            }
+            else
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new CryptographicException(SR.GetString(SR.UnsupportedTransformAlgorithm)));
+            }
+        }
+    }
+}