DigitalSignatureCollection Class

Provides a read-only collection of digital signatures attached to a document.

ExpandedInheritance Hierarchy


Namespace:  Aspose.Words.DigitalSignatures
Assembly:  Aspose.Words (in Aspose.Words.dll) Version: 22.1.0


public class DigitalSignatureCollection : IEnumerable<DigitalSignature>, 

The DigitalSignatureCollection type exposes the following members.


Public methodDigitalSignatureCollection
Initializes a new instance of the DigitalSignatureCollection class


Public propertyCode exampleCount
Gets the number of elements contained in the collection.
Public propertyCode exampleIsValid
Returns true if all digital signatures in this collection are valid and the document has not been tampered with Also returns true if there are no digital signatures. Returns false if at least one digital signature is invalid.
Public propertyCode exampleItem
Gets a document signature at the specified index.


Public methodEquals
Determines whether the specified object is equal to the current object.
(Inherited from Object.)
Public methodCode exampleGetEnumerator
Returns a dictionary enumerator object that can be used to iterate over all items in the collection.
Public methodGetHashCode
Serves as the default hash function.
(Inherited from Object.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Public methodToString
Returns a string that represents the current object.
(Inherited from Object.)



Shows how to validate and display information about each signature in a document.
Document doc = new Document(MyDir + "Digitally signed.docx");

foreach (DigitalSignature signature in doc.DigitalSignatures)
    Console.WriteLine($"{(signature.IsValid ? "Valid" : "Invalid")} signature: ");
    Console.WriteLine($"\tSign time:\t{signature.SignTime}");
    Console.WriteLine($"\tSubject name:\t{signature.CertificateHolder.Certificate.SubjectName}");
    Console.WriteLine($"\tIssuer name:\t{signature.CertificateHolder.Certificate.IssuerName.Name}");
Shows how to sign documents with X.509 certificates.
// Verify that a document is not signed.
Assert.False(FileFormatUtil.DetectFileFormat(MyDir + "Document.docx").HasDigitalSignature);

// Create a CertificateHolder object from a PKCS12 file, which we will use to sign the document.
CertificateHolder certificateHolder = CertificateHolder.Create(MyDir + "morzal.pfx", "aw", null);

// There are two ways of saving a signed copy of a document to the local file system:
// 1 - Designate a document by a local system filename and save a signed copy at a location specified by another filename.
DigitalSignatureUtil.Sign(MyDir + "Document.docx", ArtifactsDir + "Document.DigitalSignature.docx", 
    certificateHolder, new SignOptions() { SignTime = DateTime.Now } );

Assert.True(FileFormatUtil.DetectFileFormat(ArtifactsDir + "Document.DigitalSignature.docx").HasDigitalSignature);

// 2 - Take a document from a stream and save a signed copy to another stream.
using (FileStream inDoc = new FileStream(MyDir + "Document.docx", FileMode.Open))
    using (FileStream outDoc = new FileStream(ArtifactsDir + "Document.DigitalSignature.docx", FileMode.Create))
        DigitalSignatureUtil.Sign(inDoc, outDoc, certificateHolder);

Assert.True(FileFormatUtil.DetectFileFormat(ArtifactsDir + "Document.DigitalSignature.docx").HasDigitalSignature);

// Please verify that all of the document's digital signatures are valid and check their details.
Document signedDoc = new Document(ArtifactsDir + "Document.DigitalSignature.docx");
DigitalSignatureCollection digitalSignatureCollection = signedDoc.DigitalSignatures;

Assert.AreEqual(1, digitalSignatureCollection.Count);
Assert.AreEqual(DigitalSignatureType.XmlDsig, digitalSignatureCollection[0].SignatureType);
Assert.AreEqual("CN=Morzal.Me", signedDoc.DigitalSignatures[0].IssuerName);
Assert.AreEqual("CN=Morzal.Me", signedDoc.DigitalSignatures[0].SubjectName);

ExpandedSee Also