Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Configuration/System/Configuration/ProtectedConfiguration.cs

@@ -0,0 +1,86 @@
+//------------------------------------------------------------------------------
+// <copyright file="ProtectedConfiguration.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Configuration
+{
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Runtime.Serialization;
+    using System.Configuration.Provider;
+    using System.Xml;
+    using System.Security.Permissions;
+    using System.Diagnostics.CodeAnalysis;
+
+    [PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")]
+    [SuppressMessage("Microsoft.Security", "CA2112:SecuredTypesShouldNotExposeFields", Justification = "The only fields exposed are constant strings, which aren't sensitive information.")]
+    public static class ProtectedConfiguration
+    {
+        public static ProtectedConfigurationProviderCollection Providers
+        {
+            get
+            {
+                ProtectedConfigurationSection config = PrivilegedConfigurationManager.GetSection(BaseConfigurationRecord.RESERVED_SECTION_PROTECTED_CONFIGURATION) as ProtectedConfigurationSection;
+                if (config == null)
+                    return new ProtectedConfigurationProviderCollection();
+
+                return config.GetAllProviders();
+            }
+        }
+
+        public const string RsaProviderName = "RsaProtectedConfigurationProvider";
+        public const string DataProtectionProviderName = "DataProtectionConfigurationProvider";
+        public const string ProtectedDataSectionName = BaseConfigurationRecord.RESERVED_SECTION_PROTECTED_CONFIGURATION;
+
+        public static string DefaultProvider {
+            get {
+                ProtectedConfigurationSection config = PrivilegedConfigurationManager.GetSection(BaseConfigurationRecord.RESERVED_SECTION_PROTECTED_CONFIGURATION) as ProtectedConfigurationSection;
+                if (config != null)
+                    return config.DefaultProvider;
+
+                return "";
+            }
+        }
+
+
+        ///////////////////////////////////////////////////////////////////////////
+        ///////////////////////////////////////////////////////////////////////////
+        ///////////////////////////////////////////////////////////////////////////
+#if CACHE_PROVIDERS_IN_STATIC
+        private static void InstantiateProviders()
+        {
+            if (_Providers != null)
+                return;
+
+            lock (_Lock)
+            {
+                if (_Providers != null)
+                    return;
+
+                ProtectedConfigurationProviderCollection providers = new ProtectedConfigurationProviderCollection();
+                ProtectedConfigurationSection config = PrivilegedConfigurationManager.GetSection(BaseConfigurationRecord.RESERVED_SECTION_PROTECTED_CONFIGURATION) as ProtectedConfigurationSection;
+
+                if (config != null)
+                {
+                    foreach (DictionaryEntry de in config.ProviderNodes)
+                    {
+                        ProviderNode pn = de.Value as ProviderNode;
+
+                        if (pn == null)
+                            continue;
+
+                        providers.Add(pn.Provider);
+                    }
+                }
+
+                _Providers = providers;
+            }
+        }
+        private static object _Lock = new object();
+        private static ProtectedConfigurationProviderCollection _Providers = null;
+#endif
+
+    }
+}