DSASignatureFormatter Class

Definition

Namespace:

System.Security.Cryptography

Assembly:

System.Security.Cryptography.dll

Source:

DSASignatureFormatter.cs

Creates a Digital Signature Algorithm (DSA) signature.

public ref class DSASignatureFormatter : System::Security::Cryptography::AsymmetricSignatureFormatter

public class DSASignatureFormatter : System.Security.Cryptography.AsymmetricSignatureFormatter

type DSASignatureFormatter = class
    inherit AsymmetricSignatureFormatter

Public Class DSASignatureFormatter
Inherits AsymmetricSignatureFormatter

Inheritance

Object

AsymmetricSignatureFormatter

DSASignatureFormatter

Examples

#using <System.dll>

using namespace System;
using namespace System::Security::Cryptography;
int main()
{
   try
   {
      
      //Create a new instance of DSA.
      DSA^ DSA = DSA::Create();
      
      //The hash to sign.
      array<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 
      //DSA instance to transfer the key information.
      DSASignatureFormatter^ DSAFormatter = gcnew DSASignatureFormatter( DSA );
      
      //Set the hash algorithm to SHA1.
      DSAFormatter->SetHashAlgorithm( "SHA1" );
      
      //Create a signature for HashValue and return it.
      array<Byte>^SignedHash = DSAFormatter->CreateSignature( Hash );
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}

using System;
using System.Security.Cryptography;

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

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

Imports System.Security.Cryptography

 _

Class DSASample


    Shared Sub Main()
        Try
            'Create a new instance of DSA.
            Dim DSA As DSA = DSA.Create()

            '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 DSASignatureFormatter object and pass it the 
            'DSA instance to transfer the key information.
            Dim DSAFormatter As New DSASignatureFormatter(DSA)

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

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

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

Remarks

Important

The creators of the DSA algorithm have withdrawn their support for it. Consider using the RSA class or the ECDsa class instead of the DSA class. Use DSA only for compatibility with legacy applications and data.

Constructors

DSASignatureFormatter()	Initializes a new instance of the DSASignatureFormatter class.
DSASignatureFormatter(AsymmetricAlgorithm)	Initializes a new instance of the DSASignatureFormatter class with the specified key.

Methods

CreateSignature(Byte[])	Creates the Digital Signature Algorithm (DSA) PKCS #1 signature for the specified data.
CreateSignature(HashAlgorithm)	Creates the signature from the specified hash value. (Inherited from AsymmetricSignatureFormatter)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
SetHashAlgorithm(String)	Specifies the hash algorithm for the Digital Signature Algorithm (DSA) signature formatter.
SetKey(AsymmetricAlgorithm)	Specifies the key to be used for the Digital Signature Algorithm (DSA) signature formatter.
ToString()	Returns a string that represents the current object. (Inherited from Object)

See also

• Cryptographic Services