PackageDigitalSignatureManager.IsSigned Propriété

Définition

Espace de noms:

System.IO.Packaging

Assembly:

WindowsBase.dll

Obtient une valeur indiquant si le package contient des signatures.

public:
 property bool IsSigned { bool get(); };

public bool IsSigned { get; }

member this.IsSigned : bool

Public ReadOnly Property IsSigned As Boolean

Valeur de propriété

Boolean

true si le package contient des signatures ; sinon, false.

Exemples

L’exemple suivant montre comment utiliser la IsSigned propriété pour déterminer si un package contient des signatures numériques. Pour obtenir l’exemple complet, consultez Création d’un package avec un exemple de signature numérique.

// ------------------------ ValidateSignatures ------------------------
/// <summary>
///   Validates all the digital signatures of a given package.</summary>
/// <param name="package">
///   The package for validating digital signatures.</param>
/// <returns>
///   true if all digital signatures are valid; otherwise false if the
///   package is unsigned or any of the signatures are invalid.</returns>
private static bool ValidateSignatures(Package package)
{
    if (package == null)
        throw new ArgumentNullException("ValidateSignatures(package)");

    // Create a PackageDigitalSignatureManager for the given Package.
    PackageDigitalSignatureManager dsm =
        new PackageDigitalSignatureManager(package);

    // Check to see if the package contains any signatures.
    if (!dsm.IsSigned)
        return false;   // The package is not signed.

    // Verify that all signatures are valid.
    VerifyResult result = dsm.VerifySignatures(false);
    if (result != VerifyResult.Success)
        return false;   // One or more digital signatures are invalid.

    // else if (result == VerifyResult.Success)
    return true;        // All signatures are valid.
}// end:ValidateSignatures()

' ------------------------ ValidateSignatures ------------------------
''' <summary>
''' Validates all the digital signatures of a given package.</summary>
''' <param name="package">
''' The package for validating digital signatures.</param>
''' <returns>
''' true if all digital signatures are valid; otherwise false if the
''' package is unsigned or any of the signatures are invalid.</returns>
Private Shared Function ValidateSignatures(ByVal package As Package) As Boolean
    If package Is Nothing Then
        Throw New ArgumentNullException("ValidateSignatures(package)")
    End If

    ' Create a PackageDigitalSignatureManager for the given Package.
    Dim dsm As New PackageDigitalSignatureManager(package)

    ' Check to see if the package contains any signatures.
    If Not dsm.IsSigned Then
        Return False
    End If
    ' The package is not signed.
    ' Verify that all signatures are valid.
    Dim result As VerifyResult = dsm.VerifySignatures(False)
    If result <> VerifyResult.Success Then
        Return False
    End If
    ' One or more digital signatures are invalid.
    ' else if (result == VerifyResult.Success)
    ' All signatures are valid.
    Return True
End Function
' end:ValidateSignatures()

Remarques

La IsSigned propriété n’effectue pas de validations de signature. Si des signatures sont présentes et IsSigned que la valeur est true, une ou plusieurs signatures peuvent ne pas être valides. Appelez VerifySignatures pour confirmer que les signatures sont valides et n’ont pas changé.

Voir aussi

• VerifySignatures(Boolean)
• Spécification OPC (Open Packaging Conventions)