RSAPKCS1SignatureFormatter Class

Definition

Namespace:

System.Security.Cryptography

Assembly:

System.Security.Cryptography.dll

Source:

RSAPKCS1SignatureFormatter.cs

Creates an RSA PKCS #1 version 1.5 signature.

public ref class RSAPKCS1SignatureFormatter : System::Security::Cryptography::AsymmetricSignatureFormatter

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class RSAPKCS1SignatureFormatter : System.Security.Cryptography.AsymmetricSignatureFormatter

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type RSAPKCS1SignatureFormatter = class
    inherit AsymmetricSignatureFormatter

Public Class RSAPKCS1SignatureFormatter
Inherits AsymmetricSignatureFormatter

Inheritance

Object

AsymmetricSignatureFormatter

RSAPKCS1SignatureFormatter

Attributes

UnsupportedOSPlatformAttribute

Examples

The following example demonstrates how to create a PKCS #1 version 1.5 signature.

using System;
using System.Security.Cryptography;

class RSASample
{

    static void Main()
    {
        try
        {
            //Create a new instance of RSA.
            using (RSA rsa = RSA.Create())
            {
                //The hash to sign.
                byte[] hash;
                using (SHA256 sha256 = SHA256.Create())
                {
                    byte[] data = new byte[] { 59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 93, 25, 41, 100, 197, 213, 134, 130, 135 };
                    hash = sha256.ComputeHash(data);
                }

                //Create an RSASignatureFormatter object and pass it the 
                //RSA instance to transfer the key information.
                RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(rsa);

                //Set the hash algorithm to SHA256.
                RSAFormatter.SetHashAlgorithm("SHA256");

                //Create a signature for HashValue and return it.
                byte[] SignedHash = RSAFormatter.CreateSignature(hash);
            }
        }
        catch (CryptographicException e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

Imports System.Security.Cryptography

Friend Class RSASample

    Shared Sub Main()
        Try
            'Create a new instance of RSA.
            Using rsa As RSA = RSA.Create()
                'The hash to sign.
                Dim hash() As Byte
                Using sha256 As SHA256 = SHA256.Create()
                    Dim data() As Byte = { 59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 93, 25, 41, 100, 197, 213, 134, 130, 135 }
                    hash = sha256.ComputeHash(data)
                End Using

                'Create an RSASignatureFormatter object and pass it the 
                'RSA to transfer the key information.
                Dim RSAFormatter As New RSAPKCS1SignatureFormatter(rsa)

                'Set the hash algorithm to SHA256.
                RSAFormatter.SetHashAlgorithm("SHA256")

                'Create a signature for HashValue and return it.
                Dim SignedHash() As Byte = RSAFormatter.CreateSignature(hash)
            End Using

        Catch e As CryptographicException
            Console.WriteLine(e.Message)
        End Try
    End Sub

End Class

Remarks

This class is used to create a digital signature using the RSA algorithm.

Use RSAPKCS1SignatureDeformatter to verify digital signatures with the RSA algorithm.

Constructors

RSAPKCS1SignatureFormatter()	Initializes a new instance of the RSAPKCS1SignatureFormatter class.
RSAPKCS1SignatureFormatter(AsymmetricAlgorithm)	Initializes a new instance of the RSAPKCS1SignatureFormatter class with the specified key.

Methods

CreateSignature(Byte[])	Creates the RSA PKCS #1 signature for the specified data.
CreateSignature(HashAlgorithm)	Creates the signature from the specified hash value. (Inherited from AsymmetricSignatureFormatter)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
SetHashAlgorithm(String)	Sets the hash algorithm to use for creating the signature.
SetKey(AsymmetricAlgorithm)	Sets the private key to use for creating the signature.
ToString()	Returns a string that represents the current object. (Inherited from Object)

See also

• Cryptographic Services