RSAPKCS1SignatureDeformatter Class
Verifies an RSA PKCS #1 version 1.5 signature.
For a list of all members of this type, see RSAPKCS1SignatureDeformatter Members.
System.Object
System.Security.Cryptography.AsymmetricSignatureDeformatter
System.Security.Cryptography.RSAPKCS1SignatureDeformatter
[Visual Basic] Public Class RSAPKCS1SignatureDeformatter Inherits AsymmetricSignatureDeformatter [C#] public class RSAPKCS1SignatureDeformatter : AsymmetricSignatureDeformatter [C++] public __gc class RSAPKCS1SignatureDeformatter : public AsymmetricSignatureDeformatter [JScript] public class RSAPKCS1SignatureDeformatter 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.
Remarks
This class is used to verify a digital signature made with the RSA algorithm.
Use RSAPKCS1SignatureFormatter to create digital signatures with the RSA algorithm.
Example
[Visual Basic] Imports System Imports System.Security.Cryptography _ Class RSASample Shared Sub Main() Try 'Create a new instance of RSACryptoServiceProvider. Dim RSA As New RSACryptoServiceProvider() '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 RSAOPKCS1SignatureFormatter object and pass it the 'RSACryptoServiceProvider to transfer the key information. Dim RSAFormatter As New RSAPKCS1SignatureFormatter(RSA) 'Set the hash algorithm to SHA1. RSAFormatter.SetHashAlgorithm("SHA1") 'Create a signature for HashValue and return it. Dim SignedHash As Byte() = RSAFormatter.CreateSignature(Hash) 'Create an RSAPKCS1SignatureDeformatter object and pass it the 'RSACryptoServiceProvider to transfer the key information. Dim RSADeformatter As New RSAPKCS1SignatureDeformatter(RSA) RSADeformatter.SetHashAlgorithm("SHA1") 'Verify the hash and display the results to the console. If RSADeformatter.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 RSASample { static void Main() { try { //Create a new instance of RSACryptoServiceProvider. RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); //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 RSAOPKCS1SignatureFormatter object and pass it the //RSACryptoServiceProvider to transfer the key information. RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA); //Set the hash algorithm to SHA1. RSAFormatter.SetHashAlgorithm("SHA1"); //Create a signature for HashValue and return it. byte[] SignedHash = RSAFormatter.CreateSignature(Hash); //Create an RSAPKCS1SignatureDeformatter object and pass it the //RSACryptoServiceProvider to transfer the key information. RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA); RSADeformatter.SetHashAlgorithm("SHA1"); //Verify the hash and display the results to the console. if(RSADeformatter.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 RSACryptoServiceProvider. RSACryptoServiceProvider* RSA = new RSACryptoServiceProvider(); //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 RSAOPKCS1SignatureFormatter object and pass it the //RSACryptoServiceProvider to transfer the key information. RSAPKCS1SignatureFormatter* RSAFormatter = new RSAPKCS1SignatureFormatter(RSA); //Set the hash algorithm to SHA1. RSAFormatter->SetHashAlgorithm(S"SHA1"); //Create a signature for HashValue and return it. Byte SignedHash[] = RSAFormatter->CreateSignature(Hash); //Create an RSAPKCS1SignatureDeformatter object and pass it the //RSACryptoServiceProvider to transfer the key information. RSAPKCS1SignatureDeformatter* RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA); RSADeformatter->SetHashAlgorithm(S"SHA1"); //Verify the hash and display the results to the console. if (RSADeformatter->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); } }
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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
RSAPKCS1SignatureDeformatter Members | System.Security.Cryptography Namespace | Cryptographic Services