RSAPKCS1SignatureFormatter.CreateSignature(Byte[]) Méthode

Définition

Espace de noms:

System.Security.Cryptography

Assembly:

System.Security.Cryptography.dll

Source:

RSAPKCS1SignatureFormatter.cs

Crée la signature PKCS #1 RSA pour les données spécifiées.

public:
 override cli::array <System::Byte> ^ CreateSignature(cli::array <System::Byte> ^ rgbHash);

public override byte[] CreateSignature (byte[] rgbHash);

override this.CreateSignature : byte[] -> byte[]

Public Overrides Function CreateSignature (rgbHash As Byte()) As Byte()

Paramètres

rgbHash

Byte[]

Données à signer.

Retours

Byte[]

Signature numérique pour rgbHash.

Exceptions

CryptographicUnexpectedOperationException

La clé est null.

- ou -

L’algorithme de hachage a la valeur null.

ArgumentNullException

Le paramètre rgbHash a la valeur null.

Exemples

L’exemple suivant montre comment créer une signature PKCS #1 version 1.5.

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

Remarques

Vous devez spécifier une clé et un algorithme de hachage avant d’appeler cette méthode.

Voir aussi

• services de chiffrement