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DSASignatureDeformatter.SetHashAlgorithm Method

Specifies the hash algorithm for the Digital Signature Algorithm (DSA) signature deformatter.

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

public override void SetHashAlgorithm (
	string strName
)
public void SetHashAlgorithm (
	String strName
)
public override function SetHashAlgorithm (
	strName : String
)

Parameters

strName

The name of the hash algorithm to use for the signature deformatter.

Exception typeCondition

CryptographicUnexpectedOperationException

The strName parameter does not map to the SHA1 hash algorithm.

Notes to Implementers This method is not used. The DSA algorithm requires the SHA1 hash algorithm.

using System;
using System.Security.Cryptography;

class DSASample
{
		
	static void Main()
	{
		try
		{
			//Create a new instance of DSACryptoServiceProvider.
			DSACryptoServiceProvider DSA = new DSACryptoServiceProvider();

			//The hash to sign.
			byte[] Hash = {59,4,248,102,77,97,142,201,210,12,224,93,25,41,100,197,213,134,130,135};

			//Create an DSASignatureFormatter object and pass it the 
			//DSACryptoServiceProvider to transfer the key information.
			DSASignatureFormatter DSAFormatter = new DSASignatureFormatter(DSA);

			//Set the hash algorithm to SHA1.
			DSAFormatter.SetHashAlgorithm("SHA1");

			//Create a signature for HashValue and return it.
			byte[] SignedHash = DSAFormatter.CreateSignature(Hash);

			//Create an DSASignatureDeformatter object and pass it the 
			//DSACryptoServiceProvider to transfer the key information.
			DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(DSA);

			//Verify the hash and display the results to the console.
			if(DSADeformatter.VerifySignature(Hash, SignedHash))
			{
				Console.WriteLine("The signature was verified.");
			}
			else
			{
				Console.WriteLine("The signature was not verified.");
			}

		}
		catch(CryptographicException e)
		{
			Console.WriteLine(e.Message);
		}
	}

}

import System.*;
import System.Security.Cryptography.*;

class DSASample
{
    public static void main(String[] args)
    {
        try {
            // Create a new instance of DSACryptoServiceProvider.
            DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();

            // The hash to sign.
            ubyte hash[] = {59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 
                93, 25, 41, 100, 197, 213, 134, 130, 135};

            // Create an DSASignatureFormatter object and pass it the 
            // DSACryptoServiceProvider to transfer the key information.
            DSASignatureFormatter dsaFormatter = new DSASignatureFormatter(dsa);

            // Set the hash algorithm to SHA1.
            dsaFormatter.SetHashAlgorithm("SHA1");

            // Create a signature for HashValue and return it.
            ubyte signedHash[] = dsaFormatter.CreateSignature(hash);

            // Create an DSASignatureDeformatter object and pass it the 
            // DSACryptoServiceProvider to transfer the key information.
            DSASignatureDeformatter dsaDeformatter = 
                new DSASignatureDeformatter(dsa);

            // Verify the hash and display the results to the console.
            if (dsaDeformatter.VerifySignature(hash, signedHash)) {
                Console.WriteLine("The signature was verified.");
            }
            else {
                Console.WriteLine("The signature was not verified.");
            }
        }
        catch (CryptographicException e) {
            Console.WriteLine(e.get_Message());
        }
    } //main 
} //DSASample

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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