Enterprise Library 4.0, Cryptography application block.

Topics: Cryptography Application Block
Sep 29, 2009 at 6:45 PM
Edited Sep 30, 2009 at 9:30 AM


I am developing an application in which I like to use the Cryptography Application Block. But I dont want to use a config file in the application, in that case how I will get the "symmetricInstance" (A symmetric instance from configuration) parameter of "EncryptSymmetric" function to encrypt any data, as this values is from config file

Chetan Birari.

Sep 30, 2009 at 8:17 AM


In that case I think you'll need to create everything programmatically. Please try this code if this works for you:

            const string providerName = "testProvider";

            //Create the Key
            RijndaelManaged algorithm = new RijndaelManaged();
            PasswordDeriveBytes password = new PasswordDeriveBytes("passwords", algorithm.IV);
            byte[] key = password.GetBytes(32); 
            ProtectedKey protectedKey = ProtectedKey.CreateFromPlaintextKey(key, DataProtectionScope.LocalMachine);
            IKeyWriter writer = new KeyReaderWriter();
            Stream keyOutput = File.Create(@"C:\mykey.key");
            writer.Write(keyOutput, protectedKey);

            //Hash Provider
            IDictionary<string, IHashProvider> hashProviders = new Dictionary<string, IHashProvider>();
            //Symmetric Provider
            IDictionary<string, ISymmetricCryptoProvider> symmetricProviders = new Dictionary<string, ISymmetricCryptoProvider>();
            ISymmetricCryptoProvider testProvider = new SymmetricAlgorithmProvider(Type.GetType(algorithm.GetType().AssemblyQualifiedName),

            symmetricProviders.Add(providerName, testProvider);
            CryptographyManagerImpl manager = new CryptographyManagerImpl(hashProviders, symmetricProviders);
            string encryptedText = manager.EncryptSymmetric(providerName, "MagicText");

            string decryptedText = manager.DecryptSymmetric(providerName, encryptedText);


NOTE: Creating the key programmatically was taken from this post: http://entlib.codeplex.com/Thread/View.aspx?ThreadId=62662

Valiant Dudan
Global Technology and Solutions
Avanade, Inc.