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CspParameters Constructor (Int32, String)

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

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

public CspParameters(
	int dwTypeIn,
	string strProviderNameIn


Type: System.Int32

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

Type: System.String

A provider name.

Use the CspParameters constructor to specify a provider type and name.

Specify a provider type by passing a numeric value that represents the desired provider type. 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 uses the CspParameters class to select a Smart Card Cryptographic Service Provider. It then signs and verifies data using the smart card.

using System;
using System.Security.Cryptography;

namespace SmartCardSign
    class SCSign
        static void Main(string[] args)
            // To idendify the Smart Card CryptoGraphic Providers on your 
            // computer, use the Microsoft Registry Editor (Regedit.exe). 
            // The available Smart Card CryptoGraphic Providers are listed 
            // in HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Defaults\Provider. 

            // Create a new CspParameters object that identifies a  
            // Smart Card CryptoGraphic Provider. 
            // The 1st parameter comes from HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Defaults\Provider Types. 
            // The 2nd parameter comes from HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Defaults\Provider.
            CspParameters csp = new CspParameters(1, "Schlumberger Cryptographic Service Provider");
            csp.Flags = CspProviderFlags.UseDefaultKeyContainer;

            // Initialize an RSACryptoServiceProvider object using 
            // the CspParameters object.
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(csp);

            // Create some data to sign.
            byte[] data = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7 };

            Console.WriteLine("Data			: " + BitConverter.ToString(data));

            // Sign the data using the Smart Card CryptoGraphic Provider.
            byte[] sig = rsa.SignData(data, "SHA1");

            Console.WriteLine("Signature	: " + BitConverter.ToString(sig));

            // Verify the data using the Smart Card CryptoGraphic Provider. 
            bool verified = rsa.VerifyData(data, "SHA1", sig);

            Console.WriteLine("Verified		: " + verified);


Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0