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CspParameters Constructor (Int32)

Initializes a new instance of the CspParameters class with the specified provider type code.

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

public CspParameters(
	int dwTypeIn
)

Parameters

dwTypeIn
Type: System.Int32

A provider type code that specifies the kind of provider to create.

Use the CspParameters constructor to specify a provider type by passing a numeric value that represents that provider. The numeric values that represent the default provider types are defined in the WinCrypt.h header file:

  • To specify a provider compatible with the RSA algorithm, pass a value of 1to the dwTypeIn parameter.

  • To specify a provider compatible with the DSA algorithm, pass a value of 13to the dwTypeIn parameter.

For information about other provider type values, see the ProviderType field. For more information about the default provider types and their behaviors, see the Microsoft Cryptography API (CAPI) documentation in the MSDN library.

The following code example creates a key container using the CspParameters class and saves the key in the container.

using System;
using System.IO;
using System.Security.Cryptography;

public class StoreKey
{
	public static void Main()
	{
		// creates the CspParameters object and sets the key container name used to store the RSA key pair
		CspParameters cp = new CspParameters();
		cp.KeyContainerName = "MyKeyContainerName";

		// instantiates the rsa instance accessing the key container MyKeyContainerName
		RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cp);
		// add the below line to delete the key entry in MyKeyContainerName 
		// rsa.PersistKeyInCsp = false; 

		//writes out the current key pair used in the rsa instance
		Console.WriteLine("Key is : \n" + rsa.ToXmlString(true));
	}
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.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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