KeyNumber Enumeration
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KeyNumber Enumeration


Specifies whether to create an asymmetric signature key or an asymmetric exchange key.

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

public enum KeyNumber

Member nameDescription

An exchange key pair used to encrypt session keys so that they can be safely stored and exchanged with other users.


A signature key pair used for authenticating digitally signed messages or files.

Use the KeyNumber enumeration with the KeyNumber property to inspect a key type or with the KeyNumber field to specify a key type.

Legacy Code Example

The following code example demonstrates how to use the KeyNumber enumeration to specify a key type for an RSACryptoServiceProvider object.

// Create a new CspParameters object.
CspParameters cspParams = new CspParameters();

// Specify an exchange key.
cspParams.KeyNumber = (int) KeyNumber.Exchange;

// Initialize the RSACryptoServiceProvider  
// with the CspParameters object.
RSACryptoServiceProvider RSACSP = new RSACryptoServiceProvider(cspParams);

.NET Framework
Available since 2.0
Windows Phone Silverlight
Available since 7.1
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