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RSAPKCS1SignatureDeformatter Class

Verifies an RSA PKCS #1 version 1.5 signature.

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

'Declaration
<ComVisibleAttribute(True)> _
Public Class RSAPKCS1SignatureDeformatter
	Inherits AsymmetricSignatureDeformatter
'Usage
Dim instance As RSAPKCS1SignatureDeformatter

/** @attribute ComVisibleAttribute(true) */ 
public class RSAPKCS1SignatureDeformatter extends AsymmetricSignatureDeformatter
ComVisibleAttribute(true) 
public class RSAPKCS1SignatureDeformatter extends AsymmetricSignatureDeformatter

This class is used to verify a digital signature made with the RSA algorithm.

Use RSAPKCS1SignatureFormatter to create digital signatures with the RSA algorithm.

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

Imports System
Imports System.Security.Cryptography

 _

Class RSASample


    Shared Sub Main()
        Try
            'Create a new instance of RSACryptoServiceProvider.
            Dim RSA As New RSACryptoServiceProvider()

            'The hash to sign.
            Dim Hash As Byte() = {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.
            Dim RSAFormatter As New RSAPKCS1SignatureFormatter(RSA)

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

            'Create a signature for HashValue and return it.
            Dim SignedHash As Byte() = RSAFormatter.CreateSignature(Hash)

            'Create an RSAPKCS1SignatureDeformatter object and pass it the 
            'RSACryptoServiceProvider to transfer the key information.
            Dim RSADeformatter As New RSAPKCS1SignatureDeformatter(RSA)

            RSADeformatter.SetHashAlgorithm("SHA1")

            'Verify the hash and display the results to the console.
            If RSADeformatter.VerifySignature(Hash, SignedHash) Then
                Console.WriteLine("The signature was verified.")
            Else
                Console.WriteLine("The signature was not verified.")
            End If

        Catch e As CryptographicException
            Console.WriteLine(e.Message)
        End Try
    End Sub
End Class

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

System.Object
   System.Security.Cryptography.AsymmetricSignatureDeformatter
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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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