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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:
virtual void SetHashAlgorithm(
	String^ strName
) override

Parameters

strName
Type: System::String

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

ExceptionCondition
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.dll>

using namespace System;
using namespace System::Security::Cryptography;
int main()
{
   try
   {

      //Create a new instance of DSACryptoServiceProvider.
      DSACryptoServiceProvider^ DSA = gcnew DSACryptoServiceProvider;

      //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  
      //DSACryptoServiceProvider 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 );

      //Create an DSASignatureDeformatter object and pass it the  
      //DSACryptoServiceProvider to transfer the key information.
      DSASignatureDeformatter^ DSADeformatter = gcnew 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 );
   }

}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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