DigitalSignature

DigitalSignature class

Digital signature in signed file.

class DigitalSignature : public Aspose::Slides::IDigitalSignature

Methods

MethodDescription
DigitalSignature(System::SharedPtr<System::Security::Cryptography::X509Certificates::X509Certificate2>)Creates a new DigitalSignature object with the specified certificate.
DigitalSignature(System::String, System::String)Creates a new DigitalSignature object with the specified certificate file path and password.
virtual bool Equals(ptr)Compares objects using C# Object.Equals semantics.
static std::enable_if<IsSmartPtr<T1>::value&&IsSmartPtr<T2>::value, bool>::type Equals(T1 const&, T2 const&)Compares reference type objects in C# style.
static std::enable_if<!IsSmartPtr<T1>::value&&!IsSmartPtr<T2>::value, bool>::type Equals(T1 const&, T2 const&)Compares value type objects in C# style.
static bool Equals(float const&, float const&)Emulates C#-style floating point comparison where two NaNs are considered equal even though according to IEC 60559:1989 NaN is not equal to any value, including NaN.
static bool Equals(double const&, double const&)Emulates C#-style floating point comparison where two NaNs are considered equal even though according to IEC 60559:1989 NaN is not equal to any value, including NaN.
virtual bool FastCast(const Details::FastRttiBase&, void **) constFor internal purposes only.
System::SharedPtr<System::Security::Cryptography::X509Certificates::X509Certificate2> get_Certificate() overrideCertificate object that was used to sign the document. Read-only X509Certificate2.
System::String get_Comments() overrideThe purpose of signature. Read System::String.
bool get_IsValid() overrideIf this digital signature is valid and the document has not been tampered with, this value will be true. Read-only bool.
System::DateTime get_SignTime() overrideThe time when the document was signed. Read-only System::DateTime.
Detail::SmartPtrCounter * GetCounter()Gets reference counter data structure associated with the object.
virtual int32_t GetHashCode() constAnalog of C# Object.GetHashCode() method. Enables hashing of custom objects.
virtual const TypeInfo& GetType() constGets actual type of object. Analog of C# System.Object.GetType() call.
virtual bool Is(const TypeInfo&) constCheck if object represents an instance of type described by targetType. Analog of C# ‘is’ operator.
void Lock()Implements C# lock() statement locking. Call directly or use LockContext sentry object.
virtual ptr MemberwiseClone() constAnalog of C# Object.MemberwiseClone() method. Enables cloning custom types.
Object()Creates object. Initializes all internal data structures.
Object(Object const&)Copy constructor. Doesn’t copy anything, really, just initializes new object and enables copy constructing subclasses.
Object& operator=(Object const&)Assignment operator. Doesn’t copy anything, really, just initializes new object and enables copy constructing subclasses.
static bool ReferenceEquals(ptr const&, ptr const&)Compares objects by reference.
static std::enable_if<!IsSmartPtr<T>::value, bool>::type ReferenceEquals(T const&, T const&)Compares objects by reference.
static std::enable_if<!IsSmartPtr<T>::value, bool>::type ReferenceEquals(T const&, std::nullptr_t)Reference-compares value type object with nullptr.
bool ReferenceEquals(String const&, std::nullptr_t)Specialization of Object::ReferenceEquals for case of string and nullptr.
bool ReferenceEquals(String const&, String const&)Specialization of Object::ReferenceEquals for case of strings.
int RemovedSharedRefs(int)Decreases shared reference count by specified value.
void set_Comments(System::String) overrideThe purpose of signature. Write System::String.
virtual void SetTemplateWeakPtr(uint32_t)Set n’th template argument a weak pointer (rather than shared). Allows switching pointers in containers to weak mode.
int SharedCount() constGets current value of shared reference counter.
Object * SharedRefAdded()Increments shared reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
int SharedRefRemovedSafe()Decrements and returns shared reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
virtual String ToString() constAnalog of C# Object.ToString() method. Enables converting custom objects to string.
static const TypeInfo& Type()Implements C# typeof(System.Object) construct.
void Unlock()Implements C# lock() statement unlocking. Call directly or use LockContext sentry object.
Detail::SmartPtrCounter * WeakRefAdded()Increments weak reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
void WeakRefRemoved()Decrements weak reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
virtual ~Object()Destroys object. Frees all internal data structures.

Remarks

The following example demonstrates how to add digital signature from a PFX certificate in PowerPoint Presentation.

// Initialize Presentation instance
auto pres = System::MakeObject<Presentation>();

// Create DigitalSignature object with PFX file and PFX password
System::SharedPtr<DigitalSignature> signature = System::MakeObject<DigitalSignature>(u"testsignature1.pfx", u"testpass1");
// Comment new digital signature
signature->set_Comments(u"Aspose.Slides digital signing test.");
// Add digital signature to presentation
pres->get_DigitalSignatures()->Add(signature);
// Save presentation
pres->Save(u"SomePresentationSigned.pptx", SaveFormat::Pptx);

The following sample code demonstrates how to validate digital signature of PowerPoint Presentation.

// Initialize Presentation instance
auto pres = System::MakeObject<Presentation>(u"SomePresentationSigned.pptx");

if (pres->get_DigitalSignatures()->get_Count() > 0)
{
    bool allSignaturesAreValid = true;
    System::Console::WriteLine(u"Signatures used to sign the presentation: ");
    // Check if all digital signatures are valid
    for (auto&& signature : System::IterateOver(pres->get_DigitalSignatures()))
    {
        System::Console::WriteLine(signature->get_Certificate()->get_SubjectName()->get_Name() + u", " +
                                   signature->get_SignTime().ToString(u"yyyy-MM-dd HH:mm") + u" -- " +
                                   (signature->get_IsValid() ? System::String(u"VALID") : System::String(u"INVALID")));
        allSignaturesAreValid &= signature->get_IsValid();
    }

    if (allSignaturesAreValid)
    {
        System::Console::WriteLine(u"Presentation is genuine, all signatures are valid.");
    }
    else
    {
        System::Console::WriteLine(u"Presentation has been modified since signing.");
    }
}

See Also

Details_PptxUnsupportedFormatException DigitalSignatureCollection