DSASignatureDeformatter Class
Verifies a Digital Signature Algorithm (DSA) PKCS#1 v1.5 signature.
For a list of all members of this type, see DSASignatureDeformatter Members.
System.Object
System.Security.Cryptography.AsymmetricSignatureDeformatter
System.Security.Cryptography.DSASignatureDeformatter
[Visual Basic] Public Class DSASignatureDeformatter Inherits AsymmetricSignatureDeformatter [C#] public class DSASignatureDeformatter : AsymmetricSignatureDeformatter [C++] public __gc class DSASignatureDeformatter : public AsymmetricSignatureDeformatter [JScript] public class DSASignatureDeformatter extends AsymmetricSignatureDeformatter
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Example
[Visual Basic] 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 [C#] 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); } } } [C++] #using <mscorlib.dll> #using <System.dll> using namespace System; using namespace System::Security::Cryptography; int 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(S"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(S"The signature was verified."); } else { Console::WriteLine(S"The signature was not verified."); } } catch (CryptographicException* e) { Console::WriteLine(e->Message); } }
[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button
in the upper-left corner of the page.
Requirements
Namespace: System.Security.Cryptography
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family
Assembly: Mscorlib (in Mscorlib.dll)
See Also
DSASignatureDeformatter Members | System.Security.Cryptography Namespace | Cryptographic Services