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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)

[SerializableAttribute]
[ComVisibleAttribute(true)]
public enum KeyNumber

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

This value corresponds to the AT_KEYEXCHANGE value used in the unmanaged Microsoft Cryptographic API (CAPI).

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

This value corresponds to the AT_SIGNATURE value used in the unmanaged Microsoft Cryptographic API (CAPI).

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

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

Supported in: 4.6, 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 Silverlight 8.1, Windows Phone Silverlight 8
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