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DSASignatureDeformatter Class

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

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

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

'Declaration
<ComVisibleAttribute(True)> _
Public Class DSASignatureDeformatter _
	Inherits AsymmetricSignatureDeformatter

The DSASignatureDeformatter type exposes the following members.

  NameDescription
Public methodDSASignatureDeformatterInitializes a new instance of the DSASignatureDeformatter class.
Public methodDSASignatureDeformatter(AsymmetricAlgorithm)Initializes a new instance of the DSASignatureDeformatter class with the specified key.
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  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSetHashAlgorithmSpecifies the hash algorithm for the Digital Signature Algorithm (DSA) signature deformatter. (Overrides AsymmetricSignatureDeformatter.SetHashAlgorithm(String).)
Public methodSetKeySpecifies the key to be used for the Digital Signature Algorithm (DSA) signature deformatter. (Overrides AsymmetricSignatureDeformatter.SetKey(AsymmetricAlgorithm).)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodVerifySignature(Byte(), Byte())Verifies the Digital Signature Algorithm (DSA) signature on the data. (Overrides AsymmetricSignatureDeformatter.VerifySignature(Byte(), Byte()).)
Public methodVerifySignature(HashAlgorithm, Byte())Verifies the signature from the specified hash value. (Inherited from AsymmetricSignatureDeformatter.)
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Imports System
Imports System.Security.Cryptography

 _

Class DSASample


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

            '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  
            'DSACryptoServiceProvider 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)

            'Create an DSASignatureDeformatter object and pass it the  
            'DSACryptoServiceProvider to transfer the key information. 
            Dim DSADeformatter As New DSASignatureDeformatter(DSA)

            'Verify the hash and display the results to the console. 
            If DSADeformatter.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

.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

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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