DSASignatureDeformatter Class

 

Verifies a Digital Signature Algorithm (DSA) PKCS#1 v1.5 signature.

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

System.Object
  System.Security.Cryptography.AsymmetricSignatureDeformatter
    System.Security.Cryptography.DSASignatureDeformatter

[ComVisibleAttribute(true)]
public class DSASignatureDeformatter : AsymmetricSignatureDeformatter

NameDescription
System_CAPS_pubmethodDSASignatureDeformatter()

Initializes a new instance of the DSASignatureDeformatter class.

System_CAPS_pubmethodDSASignatureDeformatter(AsymmetricAlgorithm)

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

NameDescription
System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodSetHashAlgorithm(String)

Specifies the hash algorithm for the Digital Signature Algorithm (DSA) signature deformatter.(Overrides AsymmetricSignatureDeformatter.SetHashAlgorithm(String).)

System_CAPS_pubmethodSetKey(AsymmetricAlgorithm)

Specifies the key to be used for the Digital Signature Algorithm (DSA) signature deformatter.(Overrides AsymmetricSignatureDeformatter.SetKey(AsymmetricAlgorithm).)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethodVerifySignature(Byte[], Byte[])

Verifies the Digital Signature Algorithm (DSA) signature on the data.(Overrides AsymmetricSignatureDeformatter.VerifySignature(Byte[], Byte[]).)

System_CAPS_pubmethodVerifySignature(HashAlgorithm, Byte[])

Verifies the signature from the specified hash value.(Inherited from AsymmetricSignatureDeformatter.)

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);
		}
	}

}

.NET Framework
Available since 1.1

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

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