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CspKeyContainerInfo.KeyNumber Property

Gets a value that describes whether an asymmetric key was created as a signature key or an exchange key.

Namespace:  System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

public KeyNumber KeyNumber { get; }

Property Value

Type: System.Security.Cryptography.KeyNumber
One of the KeyNumber values that describes whether an asymmetric key was created as a signature key or an exchange key.

The value of the KeyNumber property is derived from the KeyNumber field of the CspParameters object that was used to initialize the CspKeyContainerInfo object.

An exchange key is an asymmetric key pair used to encrypt session keys so that they can be safely stored and exchanged with other users. The Exchange value specifies an exchange key. This value corresponds to the AT_KEYEXCHANGE value used in the unmanaged Microsoft Cryptographic API (CAPI).

A signature key is an asymmetric key pair used for authenticating (digitally signed) messages or files. The Signature value specifies a signature key. This value corresponds to the AT_SIGNATURE value used in CAPI.

The following code example creates a key container and retrieves information about that container.

using System;
using System.Security.Cryptography;
using System.Text;


public class CspKeyContainerInfoExample
{

    public static void Main(String[] args)
    {
        RSACryptoServiceProvider rsa= new RSACryptoServiceProvider();

        try
        {
            // Note: In cases where a random key is generated,    
            // a key container is not created until you call   
            // a method that uses the key.  This example calls 
            // the Encrypt method before calling the 
            // CspKeyContainerInfo property so that a key 
            // container is created.   

            // Create some data to encrypt and display it. 
            string data = "Here is some data to encrypt.";

            Console.WriteLine("Data to encrypt: " + data);

            // Convert the data to an array of bytes and  
            // encrypt it. 
            byte[] byteData = Encoding.ASCII.GetBytes(data);

            byte[] encData = rsa.Encrypt(byteData, false);

            // Display the encrypted value.
            Console.WriteLine("Encrypted Data: " + Encoding.ASCII.GetString(encData));

            Console.WriteLine();

            Console.WriteLine("CspKeyContainerInfo information:");

            Console.WriteLine();

            // Create a new CspKeyContainerInfo object.
            CspKeyContainerInfo keyInfo = rsa.CspKeyContainerInfo;

            // Display the value of each property.

            Console.WriteLine("Accessible property: " + keyInfo.Accessible);

            Console.WriteLine("Exportable property: " + keyInfo.Exportable);

            Console.WriteLine("HardwareDevice property: " + keyInfo.HardwareDevice);

            Console.WriteLine("KeyContainerName property: " + keyInfo.KeyContainerName);

            Console.WriteLine("KeyNumber property: " + keyInfo.KeyNumber.ToString());

            Console.WriteLine("MachineKeyStore property: " + keyInfo.MachineKeyStore);

            Console.WriteLine("Protected property: " + keyInfo.Protected);

            Console.WriteLine("ProviderName property: " + keyInfo.ProviderName);

            Console.WriteLine("ProviderType property: " + keyInfo.ProviderType);

            Console.WriteLine("RandomlyGenerated property: " + keyInfo.RandomlyGenerated);

            Console.WriteLine("Removable property: " + keyInfo.Removable);

            Console.WriteLine("UniqueKeyContainerName property: " + keyInfo.UniqueKeyContainerName);


        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }
        finally
        {
            // Clear the key.
            rsa.Clear();
        }
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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