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RSAPKCS1SignatureDeformatter Constructor (AsymmetricAlgorithm)

Initializes a new instance of the RSAPKCS1SignatureDeformatter class with the specified key.

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

public RSAPKCS1SignatureDeformatter (
	AsymmetricAlgorithm key
)
public RSAPKCS1SignatureDeformatter (
	AsymmetricAlgorithm key
)
public function RSAPKCS1SignatureDeformatter (
	key : AsymmetricAlgorithm
)

Parameters

key

The instance of RSA that holds the public key.

Use SetHashAlgorithm to set the hash algorithm before calling VerifySignature.

The following code example uses the RSAPKCS1SignatureFormatter class to create a digital signature and then uses the RSAPKCS1SignatureDeformatter class to verify the signature.

using System;
using System.Security.Cryptography;

class RSASample
{
		
	static void Main()
	{
		try
		{
			//Create a new instance of RSACryptoServiceProvider.
			RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

			//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 RSAOPKCS1SignatureFormatter object and pass it the 
			//RSACryptoServiceProvider to transfer the key information.
			RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA);

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

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

			//Create an RSAPKCS1SignatureDeformatter object and pass it the 
			//RSACryptoServiceProvider to transfer the key information.
			RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA);

			RSADeformatter.SetHashAlgorithm("SHA1");

			//Verify the hash and display the results to the console.
			if(RSADeformatter.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 RSASample
{
    public static void main(String[] args)
    {
        try {
            // Create a new instance of RSACryptoServiceProvider.
            RSACryptoServiceProvider rsa =  new RSACryptoServiceProvider();
            
            //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 RSAOPKCS1SignatureFormatter object and pass it the 
            // RSACryptoServiceProvider to transfer the key information.
            RSAPKCS1SignatureFormatter rsaFormatter =  
                new RSAPKCS1SignatureFormatter(rsa);
            
            // Set the hash algorithm to SHA1.
            rsaFormatter.SetHashAlgorithm("SHA1");
            
            // Create a signature for HashValue and return it.
            ubyte signedHash[] = rsaFormatter.CreateSignature(hash);
            
            // Create an RSAPKCS1SignatureDeformatter object and pass it the 
            // RSACryptoServiceProvider to transfer the key information.
            RSAPKCS1SignatureDeformatter rsaDeformatter =  
                new RSAPKCS1SignatureDeformatter(rsa);
            
            rsaDeformatter.SetHashAlgorithm("SHA1");
            
            // Verify the hash and display the results to the console.
            if (rsaDeformatter.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
} //RSASample

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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