RsaProtectedConfigurationProvider Class
Provides a ProtectedConfigurationProvider instance that uses RSA encryption to encrypt and decrypt configuration data.
Assembly: System.Configuration (in System.Configuration.dll)
The RsaProtectedConfigurationProvider class gives you a way to encrypt sensitive information stored in a configuration file, which helps protect it from unauthorized access. You use the built-in RsaProtectedConfigurationProvider instance by declaring the provider and making appropriate settings in the configuration file instead of creating an instance of this class, as shown in the example later in this topic.
The RsaProtectedConfigurationProvider object uses the cryptography functions provided by RSA class to encrypt and decrypt configuration sections.
 Note: |
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Before ASP.NET can decrypt encrypted information in your configuration file, the identity of your ASP.NET application must have read access to the encryption key used to encrypt and decrypt the configuration data. For more information, see Walkthrough: Encrypting Configuration Information Using Protected Configuration. |
The following code example shows how to use the standard RsaProtectedConfigurationProvider to protect or unprotect a configuration section.
using System; using System.Configuration; public class UsingRsaProtectedConfigurationProvider { // Protect the connectionStrings section. private static void ProtectConfiguration() { // Get the application configuration file. System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration( ConfigurationUserLevel.None); // Define the Rsa provider name. string provider = "RsaProtectedConfigurationProvider"; // Get the section to protect. ConfigurationSection connStrings = config.ConnectionStrings; if (connStrings != null) { if (!connStrings.SectionInformation.IsProtected) { if (!connStrings.ElementInformation.IsLocked) { // Protect the section. connStrings.SectionInformation.ProtectSection(provider); connStrings.SectionInformation.ForceSave = true; config.Save(ConfigurationSaveMode.Full); Console.WriteLine("Section {0} is now protected by {1}", connStrings.SectionInformation.Name, connStrings.SectionInformation.ProtectionProvider.Name); } else Console.WriteLine( "Can't protect, section {0} is locked", connStrings.SectionInformation.Name); } else Console.WriteLine( "Section {0} is already protected by {1}", connStrings.SectionInformation.Name, connStrings.SectionInformation.ProtectionProvider.Name); } else Console.WriteLine("Can't get the section {0}", connStrings.SectionInformation.Name); } // Unprotect the connectionStrings section. private static void UnProtectConfiguration() { // Get the application configuration file. System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration( ConfigurationUserLevel.None); // Get the section to unprotect. ConfigurationSection connStrings = config.ConnectionStrings; if (connStrings != null) { if (connStrings.SectionInformation.IsProtected) { if (!connStrings.ElementInformation.IsLocked) { // Unprotect the section. connStrings.SectionInformation.UnprotectSection(); connStrings.SectionInformation.ForceSave = true; config.Save(ConfigurationSaveMode.Full); Console.WriteLine("Section {0} is now unprotected.", connStrings.SectionInformation.Name); } else Console.WriteLine( "Can't unprotect, section {0} is locked", connStrings.SectionInformation.Name); } else Console.WriteLine( "Section {0} is already unprotected.", connStrings.SectionInformation.Name); } else Console.WriteLine("Can't get the section {0}", connStrings.SectionInformation.Name); } public static void Main(string[] args) { string selection = string.Empty; if (args.Length == 0) { Console.WriteLine( "Select protect or unprotect"); return; } selection = args[0].ToLower(); switch (selection) { case "protect": ProtectConfiguration(); break; case "unprotect": UnProtectConfiguration(); break; default: Console.WriteLine("Unknown selection"); break; } Console.Read(); } }
The following example shows an excerpt from a configuration file after encryption.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<connectionStrings configProtectionProvider="RsaProtectedConfigurationProvider">
<EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element"
xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc" />
<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
<EncryptedKey xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-1_5" />
<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
<KeyName>Rsa Key</KeyName>
</KeyInfo>
<CipherData>
<CipherValue>B702tRDVHJjC3CYXt7I0ucCDjdht/Vyk/DdUhwQyt7vepSD85dwCP8ox9Y1BUdjajFeTFfFBsGypbli5HPGRYamQdrVkPo07bBBXNT5H02qxREguGUU4iDtV1Xp8BLVZjQMV4ZgP6Wbctw2xRvPC7GvKHLI4fUN/Je5LmutsijA=</CipherValue>
</CipherData>
</EncryptedKey>
</KeyInfo>
<CipherData>
<CipherValue>ME+XJA2TAj3QN3yT4pJq3sRArC0i7Cz3Da71BkaRe9QNfuVuUjcv0jeGUN4wDdOAZ7LPq6UpVrpirY3kQcALDvPJ5nKxk++Mw75rjtIO8eh2goTY9rCK6zanfzaDshFy7IqItpvs/y2kmij25nM3ury6uO0hCf0UbEL1mbT2jXDqvcrHZUobO1Ef6bygBZ/8HpU+VfF9CTCob/BBE9zUkK37EQhcduwsnzBvDblYbF/Rd+F4lxAkZnecGLfCZjOzJB4xH1a0vvWtPR7zNwL/7I0uHzQjyMdWrkBnotMjoR70R7NELBotCogWO0MBimncKigdR3dTTdrCd72a7UJ4LMlEQaZXGIJp4PIg6qVDHII=</CipherValue>
</CipherData>
</EncryptedData>
</connectionStrings>
</configuration>
- SecurityPermission
for full access to the resource protected by the permission. Demand.
System.Configuration.Provider.ProviderBase
System.Configuration.ProtectedConfigurationProvider
System.Configuration.RsaProtectedConfigurationProvider
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
