ProtectedConfigurationSection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Configuration / System / Configuration / ProtectedConfigurationSection.cs / 1305376 / ProtectedConfigurationSection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Configuration 
{ 
    using System.Collections;
    using System.Collections.Specialized; 
    using System.Xml;
    using System.Globalization;
    using System.Security.Permissions;
 
    public sealed class ProtectedConfigurationSection : ConfigurationSection
    { 
        internal ProtectedConfigurationProvider GetProviderFromName(string providerName) 
        {
            ProviderSettings ps = Providers[providerName]; 

            if (ps == null) {
                throw new Exception(SR.GetString(SR.ProtectedConfigurationProvider_not_found, providerName));
            } 

            return InstantiateProvider(ps); 
        } 

        internal ProtectedConfigurationProviderCollection GetAllProviders() 
        {
            ProtectedConfigurationProviderCollection coll = new ProtectedConfigurationProviderCollection();
            foreach(ProviderSettings ps in Providers)
            { 
                coll.Add(InstantiateProvider(ps));
            } 
            return coll; 
        }
 
        [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
        private ProtectedConfigurationProvider CreateAndInitializeProviderWithAssert(Type t, ProviderSettings pn) {
            ProtectedConfigurationProvider provider = (ProtectedConfigurationProvider)TypeUtil.CreateInstanceWithReflectionPermission(t);
            NameValueCollection pars = pn.Parameters; 
            NameValueCollection cloneParams = new NameValueCollection(pars.Count);
 
            foreach (string key in pars) { 
                cloneParams[key] = pars[key];
            } 

            provider.Initialize(pn.Name, cloneParams);
            return provider;
        } 

        private ProtectedConfigurationProvider InstantiateProvider(ProviderSettings pn) 
        { 
            Type t = TypeUtil.GetTypeWithReflectionPermission(pn.Type, true);
            if (!typeof(ProtectedConfigurationProvider).IsAssignableFrom(t)) { 
                throw new Exception(SR.GetString(SR.WrongType_of_Protected_provider));
            }

            // Needs to check APTCA bit.  See VSWhidbey 429996. 
            if (!TypeUtil.IsTypeAllowedInConfig(t)) {
                throw new Exception(SR.GetString(SR.Type_from_untrusted_assembly, t.FullName)); 
            } 

            // Needs to check Assert Fulltrust in order for runtime to work.  See VSWhidbey 429996. 
            return CreateAndInitializeProviderWithAssert(t, pn);
        }

        internal static string DecryptSection(string encryptedXml, ProtectedConfigurationProvider provider) { 
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(encryptedXml); 
            XmlNode resultNode = provider.Decrypt(doc.DocumentElement); 
            return resultNode.OuterXml;
        } 

        private const string    EncryptedSectionTemplate = "<{0} {1}=\"{2}\"> {3} ";

        internal static string FormatEncryptedSection(string encryptedXml, string sectionName, string providerName) { 
            return String.Format(CultureInfo.InvariantCulture, EncryptedSectionTemplate,
                        sectionName,    // The section to encrypt 
                        BaseConfigurationRecord.KEYWORD_PROTECTION_PROVIDER, // protectionProvider keyword 
                        providerName,  // The provider name
                        encryptedXml   // the encrypted xml 
                        );
        }

        internal static string EncryptSection(string clearXml, ProtectedConfigurationProvider provider) { 
            XmlDocument xmlDocument = new XmlDocument();
            xmlDocument.PreserveWhitespace = true; 
            xmlDocument.LoadXml(clearXml); 
            string sectionName = xmlDocument.DocumentElement.Name;
            XmlNode encNode = provider.Encrypt(xmlDocument.DocumentElement); 
            return encNode.OuterXml;
        }

 
        //////////////////////////////////////////////////////////////////////
        ////////////////////////////////////////////////////////////////////// 
        ////////////////////////////////////////////////////////////////////// 
        //////////////////////////////////////////////////////////////////////
 
        private static ConfigurationPropertyCollection _properties;
        private static readonly ConfigurationProperty _propProviders =
            new ConfigurationProperty("providers",
                                        typeof(ProtectedProviderSettings), 
                                        new ProtectedProviderSettings(),
                                        ConfigurationPropertyOptions.None); 
 
        private static readonly ConfigurationProperty _propDefaultProvider =
            new ConfigurationProperty("defaultProvider", 
                                        typeof(string),
                                        "RsaProtectedConfigurationProvider",
                                        null,
                                        ConfigurationProperty.NonEmptyStringValidator, 
                                        ConfigurationPropertyOptions.None);
 
        static ProtectedConfigurationSection() 
        {
            // Property initialization 
            _properties = new ConfigurationPropertyCollection();
            _properties.Add(_propProviders);
            _properties.Add(_propDefaultProvider);
        } 

        public ProtectedConfigurationSection() 
        { 
        }
 
        protected internal override ConfigurationPropertyCollection Properties
        {
            get
            { 
                return _properties;
            } 
        } 

        private ProtectedProviderSettings _Providers 
        {
            get
            {
                return (ProtectedProviderSettings)base[_propProviders]; 
            }
        } 
 
        [ConfigurationProperty("providers")]
        public ProviderSettingsCollection Providers 
        {
            get
            {
                return _Providers.Providers; 
            }
        } 
 
        [ConfigurationProperty("defaultProvider", DefaultValue = "RsaProtectedConfigurationProvider")]
        public string DefaultProvider 
        {
            get
            {
                return (string)base[_propDefaultProvider]; 
            }
            set 
            { 
                base[_propDefaultProvider] = value;
            } 
        }

    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ProtectedConfigurationSection.cs source code in C# .NET

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