PdfSignatureInformation Class
In This Topic
Contains information about a digital signature.
Object Model
Syntax
'Declaration Public Class PdfSignatureInformation Inherits Vintasoft.Imaging.Pdf.Tree.PdfTreeNodeBase
public class PdfSignatureInformation : Vintasoft.Imaging.Pdf.Tree.PdfTreeNodeBase
public __gc class PdfSignatureInformation : public Vintasoft.Imaging.Pdf.Tree.PdfTreeNodeBase*
public ref class PdfSignatureInformation : public Vintasoft.Imaging.Pdf.Tree.PdfTreeNodeBase^
Remarks
If this signature must be verified, create PKCS signature object using the GetSignature method and verify signature using the Verify method.
If signature does not cover the whole document, i.e. the SignatureCoversWholeDocument method returns false, check the subsequent changes using the GetDocumentChanges method.
Example
Here is an example that shows how to display an information about the digital signatures and verify the digital signatures of PDF document:
''' <summary>
''' Displays and verifies signatures of PDF document.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
Public Shared Sub VerifyDocumentSignatures(pdfFilename As String)
' open PDF document
Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename)
' if document does not have interactive form
If document.InteractiveForm Is Nothing Then
System.Console.WriteLine("Signature fields are not found.")
Return
End If
' get an array of signature fields of document
Dim signatureFields As Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormSignatureField() = document.InteractiveForm.GetSignatureFields()
' if document does not have signature fields
If signatureFields.Length = 0 Then
System.Console.WriteLine("Signture fields are not found.")
Return
End If
' for each signature field
For i As Integer = 0 To signatureFields.Length - 1
' get reference to the signature field
Dim signatureField As Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormSignatureField = signatureFields(i)
' print signature field name
System.Console.WriteLine(String.Format("[{0}]Signaure field: {1}", i + 1, signatureField.FullyQualifiedName))
' get information about signature
Dim signatureInfo As Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfSignatureInformation = signatureField.SignatureInfo
' if signature information is empty
If signatureInfo Is Nothing Then
System.Console.WriteLine("Empty signature field.")
Else
' if signature information is NOT empty
' check is document timestamp signature
If signatureInfo.IsTimeStamp Then
System.Console.WriteLine("Signature is a document timestamp signature")
End If
' print signature filter
System.Console.WriteLine(String.Format("Filter : {0} ({1})", signatureInfo.Filter, signatureInfo.SubFilter))
' print the signer name
If signatureInfo.SignerName IsNot Nothing Then
System.Console.WriteLine(String.Format("Signed by : {0}", signatureInfo.SignerName))
End If
' print the signature reason
If signatureInfo.Reason IsNot Nothing Then
System.Console.WriteLine(String.Format("Reason : {0}", signatureInfo.Reason))
End If
' print the signature location
If signatureInfo.Location IsNot Nothing Then
System.Console.WriteLine(String.Format("Location : {0}", signatureInfo.Location))
End If
' print the signer contact info
If signatureInfo.ContactInfo IsNot Nothing Then
System.Console.WriteLine(String.Format("Contact Info: {0}", signatureInfo.SignerName))
End If
' print the signing date
If signatureInfo.SigningTime <> System.DateTime.MinValue Then
System.Console.WriteLine(String.Format("Signig Date : {0}", signatureInfo.SigningTime.ToString("f")))
End If
' get PKCS signature
Dim [error] As Boolean = False
Dim signature As Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfPkcsSignature = Nothing
Try
signature = signatureInfo.GetSignature()
Catch e As System.Exception
[error] = True
System.Console.WriteLine("PKCS signature parsing error: {0}", e.Message)
End Try
If [error] Then
Continue For
End If
' print name of signature algorithm
System.Console.WriteLine(String.Format("Algorithm : {0}", signature.SignatureAlgorithmName))
' print information about signature certificate chain
System.Console.WriteLine("Sign certificate chain:")
Dim signCertChain As System.Security.Cryptography.X509Certificates.X509Certificate2() = signature.SigningCertificateChain
Dim padding As String = ""
For Each cert As System.Security.Cryptography.X509Certificates.X509Certificate2 In signCertChain
padding += " "
System.Console.WriteLine("{0}Serial number: {1}", padding, cert.SerialNumber)
System.Console.WriteLine("{0}Issuer : {1}", padding, cert.GetNameInfo(System.Security.Cryptography.X509Certificates.X509NameType.SimpleName, True))
System.Console.WriteLine("{0}Subject : {1}", padding, cert.GetNameInfo(System.Security.Cryptography.X509Certificates.X509NameType.SimpleName, False))
Next
' verify digital signature
VerifyDigitalSignature(signatureInfo, signature)
End If
System.Console.WriteLine()
Next
End Using
End Sub
''' <summary>
''' Verifies the digital signature.
''' </summary>
''' <param name="signature">The signature.</param>
''' <param name="signatureInfo">The signature information.</param>
''' <returns><b>true</b> if signature is valid; otherwise, <b>false</b>.</returns>
Public Shared Function VerifyDigitalSignature(signatureInfo As Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfSignatureInformation, signature As Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfPkcsSignature) As Boolean
System.Console.WriteLine("Verifying signature...")
Dim signatureVerifyResult As Boolean = False
Dim embeddedTimestampVerifyResult As Boolean = False
Dim certificateVerifyResult As Boolean = False
Dim embeddedTimestampCertificateVerifyResult As Boolean = False
Dim signatureCoversWholeDocument As Boolean = False
Dim certificateChain As System.Security.Cryptography.X509Certificates.X509Chain = Nothing
Dim timestampCertificateChain As System.Security.Cryptography.X509Certificates.X509Chain = Nothing
' verify signature
Try
' check that signature covers the whole document
signatureCoversWholeDocument = signatureInfo.SignatureCoversWholeDocument()
' verify PKCS signature
signatureVerifyResult = signature.VerifySignature()
' if signature has embedded timestamp
If signature.HasEmbeddedTimeStamp Then
' verify embedded timestamp
embeddedTimestampVerifyResult = signature.VerifyTimestamp()
End If
' build and verify certificate chain
certificateChain = New System.Security.Cryptography.X509Certificates.X509Chain()
certificateVerifyResult = certificateChain.Build(signature.SigningCertificate)
' if signature has embedded timestamp
If signature.HasEmbeddedTimeStamp Then
' build and verify timestamp certificate chain
timestampCertificateChain = New System.Security.Cryptography.X509Certificates.X509Chain()
embeddedTimestampCertificateVerifyResult = certificateChain.Build(signature.TimestampCertificate)
End If
Catch verificationException As System.Exception
System.Console.WriteLine("Verification failed: {0}", verificationException.Message)
Return False
End Try
Dim pageContentModified As Boolean = False
Dim subsequentChangesMessage As String = ""
' if PKCS signature verification is passed AND signature does not cover the whole document
If signatureVerifyResult AndAlso Not signatureCoversWholeDocument Then
Try
' if signature has revision info
If signatureInfo.SignedRevision IsNot Nothing Then
' check subsequent changes
Using documentChanges As Vintasoft.Imaging.Pdf.PdfDocumentRevisionComparer = signatureInfo.GetDocumentChanges()
' check subsequent changes in pages content
pageContentModified = documentChanges.HasModifiedPages
' build subsequent changes message
If documentChanges.ChangedPageContents.Count > 0 Then
subsequentChangesMessage += String.Format("{0} page(s) modified; ", documentChanges.ChangedPageContents.Count)
End If
If documentChanges.AddedPages.Count > 0 Then
subsequentChangesMessage += String.Format("{0} page(s) added; ", documentChanges.AddedPages.Count)
End If
If documentChanges.RemovedPages.Count > 0 Then
subsequentChangesMessage += String.Format("{0} page(s) removed; ", documentChanges.RemovedPages.Count)
End If
If documentChanges.RemovedAnnotations.Count > 0 Then
subsequentChangesMessage += String.Format("annotations(s) on {0} page(s) removed; ", documentChanges.RemovedAnnotations.Count)
End If
If documentChanges.RemovedAnnotations.Count > 0 Then
subsequentChangesMessage += String.Format("removed annotation(s) on {0} page(s); ", documentChanges.RemovedAnnotations.Count)
End If
If documentChanges.AddedAnnotations.Count > 0 Then
subsequentChangesMessage += String.Format("added annotation(s) on {0} page(s); ", documentChanges.AddedAnnotations.Count)
End If
If documentChanges.ChangedAnnotations.Count > 0 Then
subsequentChangesMessage += String.Format("changed annotation(s) on {0} page(s); ", documentChanges.ChangedAnnotations.Count)
End If
If documentChanges.MiscellaneousChanges.Count > 0 Then
subsequentChangesMessage += String.Format("miscellaneous changes: {0}; ", documentChanges.MiscellaneousChanges.Count)
End If
End Using
End If
Catch verificationException As System.Exception
System.Console.WriteLine("Verification failed: {0}", verificationException.Message)
Return False
End Try
End If
' print signature verification result
' if PKCS signature verification is failed OR
' signature does not cover the whole document AND page(s) content is modified
If Not signatureVerifyResult OrElse (Not signatureCoversWholeDocument AndAlso pageContentModified) Then
System.Console.WriteLine("Signature is INVALID.")
' if certificate verification is failed
ElseIf Not certificateVerifyResult OrElse (signature.HasEmbeddedTimeStamp AndAlso (Not embeddedTimestampCertificateVerifyResult OrElse Not embeddedTimestampVerifyResult)) Then
System.Console.WriteLine("Signature validity is UNKNOWN.")
Else
System.Console.WriteLine("Signature is VALID.")
End If
' print signature verification details
' if signature verification is successful
If signatureVerifyResult Then
' if signature covers the whole document
If signatureCoversWholeDocument Then
System.Console.WriteLine(" Signature verification: Document has not been modified since this signature was applied.")
Else
' if signature does NOT cover the whole document
If pageContentModified Then
System.Console.WriteLine(" Signature verification: Document has been modified or corrupted since it was signed.")
System.Console.WriteLine(String.Format(" Subsequent changes: {0}.", subsequentChangesMessage))
ElseIf subsequentChangesMessage <> "" Then
System.Console.WriteLine(" Signature verification: The revision of the document that was covered by this signature has not been altered; however, there have been subsequent changes to the document.")
System.Console.WriteLine(String.Format(" Subsequent changes: {0}.", subsequentChangesMessage))
Else
System.Console.WriteLine(" Signature verification: Document has not been modified since this signature was applied.")
End If
End If
Else
' if signature verification is NOT successful
System.Console.WriteLine(" Signature verification: Document has been modified or corrupted since it was signed.")
End If
' if signature has embedded timestamp
If signature.HasEmbeddedTimeStamp Then
If embeddedTimestampVerifyResult Then
System.Console.WriteLine(" Timestamp verification: Timestamp is valid.")
Else
System.Console.WriteLine(" Timestamp verification: Timestamp is valid.")
End If
End If
' print certificate verification details
' if certificate chain is present
If certificateChain IsNot Nothing Then
' if certificate verification is successful
If certificateVerifyResult Then
System.Console.WriteLine(" Certificate verification: Signer's certificate is valid.")
Else
' if certificate verification is NOT successful
' print certificate verification status
System.Console.WriteLine(" Certificate verification: Signer's certificate is invalid:")
For Each status As System.Security.Cryptography.X509Certificates.X509ChainStatus In certificateChain.ChainStatus
System.Console.Write(String.Format(" {0}: {1}", status.Status, status.StatusInformation))
Next
End If
End If
' if timestamp certificate chain is present
If timestampCertificateChain IsNot Nothing Then
' if timestamp certificate verification is successful
If embeddedTimestampCertificateVerifyResult Then
System.Console.WriteLine(" Timestamp certificate verification: Signer's certificate is valid.")
Else
' if timestamp certificate verification is NOT successful
' print certificate verification status
System.Console.WriteLine(" Timestamp certificate verification: Signer's certificate is invalid:")
For Each status As System.Security.Cryptography.X509Certificates.X509ChainStatus In timestampCertificateChain.ChainStatus
System.Console.Write(String.Format(" {0}: {1}", status.Status, status.StatusInformation))
Next
End If
End If
' if signature is not verified
If Not signatureVerifyResult Then
Return False
End If
' if signature does NOT cover the whole document and page content was modified
If Not signatureCoversWholeDocument AndAlso pageContentModified Then
Return False
End If
' if signature certificate is NOT verified
If Not certificateVerifyResult Then
Return False
End If
If signature.HasEmbeddedTimeStamp Then
' if timestamp is NOT verified
If Not embeddedTimestampVerifyResult Then
Return False
End If
' if timestamp certifiacet is NOT verified
If Not embeddedTimestampCertificateVerifyResult Then
Return False
End If
End If
' sigature is VALID
Return True
End Function
/// <summary>
/// Displays and verifies signatures of PDF document.
/// </summary>
/// <param name="pdfFilename">The filename of PDF document.</param>
public static void VerifyDocumentSignatures(string pdfFilename)
{
// open PDF document
using (Vintasoft.Imaging.Pdf.PdfDocument document =
new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename))
{
// if document does not have interactive form
if (document.InteractiveForm == null)
{
System.Console.WriteLine("Signature fields are not found.");
return;
}
// get an array of signature fields of document
Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormSignatureField[] signatureFields =
document.InteractiveForm.GetSignatureFields();
// if document does not have signature fields
if (signatureFields.Length == 0)
{
System.Console.WriteLine("Signture fields are not found.");
return;
}
// for each signature field
for (int i = 0; i < signatureFields.Length; i++)
{
// get reference to the signature field
Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormSignatureField signatureField = signatureFields[i];
// print signature field name
System.Console.WriteLine(string.Format("[{0}]Signaure field: {1}", i + 1, signatureField.FullyQualifiedName));
// get information about signature
Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfSignatureInformation signatureInfo = signatureField.SignatureInfo;
// if signature information is empty
if (signatureInfo == null)
{
System.Console.WriteLine("Empty signature field.");
}
// if signature information is NOT empty
else
{
// check is document timestamp signature
if (signatureInfo.IsTimeStamp)
System.Console.WriteLine("Signature is a document timestamp signature");
// print signature filter
System.Console.WriteLine(string.Format("Filter : {0} ({1})", signatureInfo.Filter, signatureInfo.SubFilter));
// print the signer name
if (signatureInfo.SignerName != null)
System.Console.WriteLine(string.Format("Signed by : {0}", signatureInfo.SignerName));
// print the signature reason
if (signatureInfo.Reason != null)
System.Console.WriteLine(string.Format("Reason : {0}", signatureInfo.Reason));
// print the signature location
if (signatureInfo.Location != null)
System.Console.WriteLine(string.Format("Location : {0}", signatureInfo.Location));
// print the signer contact info
if (signatureInfo.ContactInfo != null)
System.Console.WriteLine(string.Format("Contact Info: {0}", signatureInfo.SignerName));
// print the signing date
if (signatureInfo.SigningTime != System.DateTime.MinValue)
System.Console.WriteLine(string.Format("Signig Date : {0}", signatureInfo.SigningTime.ToString("f")));
// get PKCS signature
bool error = false;
Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfPkcsSignature signature = null;
try
{
signature = signatureInfo.GetSignature();
}
catch (System.Exception e)
{
error = true;
System.Console.WriteLine("PKCS signature parsing error: {0}", e.Message);
}
if (error)
continue;
// print name of signature algorithm
System.Console.WriteLine(string.Format("Algorithm : {0}", signature.SignatureAlgorithmName));
// print information about signature certificate chain
System.Console.WriteLine("Sign certificate chain:");
System.Security.Cryptography.X509Certificates.X509Certificate2[] signCertChain =
signature.SigningCertificateChain;
string padding = "";
foreach (System.Security.Cryptography.X509Certificates.X509Certificate2 cert in signCertChain)
{
padding += " ";
System.Console.WriteLine("{0}Serial number: {1}", padding, cert.SerialNumber);
System.Console.WriteLine("{0}Issuer : {1}", padding, cert.GetNameInfo(
System.Security.Cryptography.X509Certificates.X509NameType.SimpleName, true));
System.Console.WriteLine("{0}Subject : {1}", padding, cert.GetNameInfo(
System.Security.Cryptography.X509Certificates.X509NameType.SimpleName, false));
}
// verify digital signature
VerifyDigitalSignature(signatureInfo, signature);
}
System.Console.WriteLine();
}
}
}
/// <summary>
/// Verifies the digital signature.
/// </summary>
/// <param name="signature">The signature.</param>
/// <param name="signatureInfo">The signature information.</param>
/// <returns><b>true</b> if signature is valid; otherwise, <b>false</b>.</returns>
public static bool VerifyDigitalSignature(
Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfSignatureInformation signatureInfo,
Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfPkcsSignature signature)
{
System.Console.WriteLine("Verifying signature...");
bool signatureVerifyResult = false;
bool embeddedTimestampVerifyResult = false;
bool certificateVerifyResult = false;
bool embeddedTimestampCertificateVerifyResult = false;
bool signatureCoversWholeDocument = false;
System.Security.Cryptography.X509Certificates.X509Chain certificateChain = null;
System.Security.Cryptography.X509Certificates.X509Chain timestampCertificateChain = null;
// verify signature
try
{
// check that signature covers the whole document
signatureCoversWholeDocument = signatureInfo.SignatureCoversWholeDocument();
// verify PKCS signature
signatureVerifyResult = signature.VerifySignature();
// if signature has embedded timestamp
if (signature.HasEmbeddedTimeStamp)
{
// verify embedded timestamp
embeddedTimestampVerifyResult = signature.VerifyTimestamp();
}
// build and verify certificate chain
certificateChain = new System.Security.Cryptography.X509Certificates.X509Chain();
certificateVerifyResult = certificateChain.Build(signature.SigningCertificate);
// if signature has embedded timestamp
if (signature.HasEmbeddedTimeStamp)
{
// build and verify timestamp certificate chain
timestampCertificateChain = new System.Security.Cryptography.X509Certificates.X509Chain();
embeddedTimestampCertificateVerifyResult = certificateChain.Build(signature.TimestampCertificate);
}
}
catch (System.Exception verificationException)
{
System.Console.WriteLine("Verification failed: {0}", verificationException.Message);
return false;
}
bool pageContentModified = false;
string subsequentChangesMessage = "";
// if PKCS signature verification is passed AND signature does not cover the whole document
if (signatureVerifyResult && !signatureCoversWholeDocument)
{
try
{
// if signature has revision info
if (signatureInfo.SignedRevision != null)
{
// check subsequent changes
using (Vintasoft.Imaging.Pdf.PdfDocumentRevisionComparer documentChanges = signatureInfo.GetDocumentChanges())
{
// check subsequent changes in pages content
pageContentModified = documentChanges.HasModifiedPages;
// build subsequent changes message
if (documentChanges.ChangedPageContents.Count > 0)
subsequentChangesMessage += string.Format("{0} page(s) modified; ", documentChanges.ChangedPageContents.Count);
if (documentChanges.AddedPages.Count > 0)
subsequentChangesMessage += string.Format("{0} page(s) added; ", documentChanges.AddedPages.Count);
if (documentChanges.RemovedPages.Count > 0)
subsequentChangesMessage += string.Format("{0} page(s) removed; ", documentChanges.RemovedPages.Count);
if (documentChanges.RemovedAnnotations.Count > 0)
subsequentChangesMessage += string.Format("annotations(s) on {0} page(s) removed; ", documentChanges.RemovedAnnotations.Count);
if (documentChanges.RemovedAnnotations.Count > 0)
subsequentChangesMessage += string.Format("removed annotation(s) on {0} page(s); ", documentChanges.RemovedAnnotations.Count);
if (documentChanges.AddedAnnotations.Count > 0)
subsequentChangesMessage += string.Format("added annotation(s) on {0} page(s); ", documentChanges.AddedAnnotations.Count);
if (documentChanges.ChangedAnnotations.Count > 0)
subsequentChangesMessage += string.Format("changed annotation(s) on {0} page(s); ", documentChanges.ChangedAnnotations.Count);
if (documentChanges.MiscellaneousChanges.Count > 0)
subsequentChangesMessage += string.Format("miscellaneous changes: {0}; ", documentChanges.MiscellaneousChanges.Count);
}
}
}
catch (System.Exception verificationException)
{
System.Console.WriteLine("Verification failed: {0}", verificationException.Message);
return false;
}
}
// print signature verification result
// if PKCS signature verification is failed OR
// signature does not cover the whole document AND page(s) content is modified
if (!signatureVerifyResult || (!signatureCoversWholeDocument && pageContentModified))
System.Console.WriteLine("Signature is INVALID.");
// if certificate verification is failed
else if (!certificateVerifyResult || (signature.HasEmbeddedTimeStamp && (!embeddedTimestampCertificateVerifyResult || !embeddedTimestampVerifyResult)))
System.Console.WriteLine("Signature validity is UNKNOWN.");
else
System.Console.WriteLine("Signature is VALID.");
// print signature verification details
// if signature verification is successful
if (signatureVerifyResult)
{
// if signature covers the whole document
if (signatureCoversWholeDocument)
{
System.Console.WriteLine(" Signature verification: Document has not been modified since this signature was applied.");
}
// if signature does NOT cover the whole document
else
{
if (pageContentModified)
{
System.Console.WriteLine(" Signature verification: Document has been modified or corrupted since it was signed.");
System.Console.WriteLine(string.Format(" Subsequent changes: {0}.", subsequentChangesMessage));
}
else if (subsequentChangesMessage != "")
{
System.Console.WriteLine(" Signature verification: The revision of the document that was covered by this signature has not been altered; however, there have been subsequent changes to the document.");
System.Console.WriteLine(string.Format(" Subsequent changes: {0}.", subsequentChangesMessage));
}
else
{
System.Console.WriteLine(" Signature verification: Document has not been modified since this signature was applied.");
}
}
}
// if signature verification is NOT successful
else
{
System.Console.WriteLine(" Signature verification: Document has been modified or corrupted since it was signed.");
}
// if signature has embedded timestamp
if (signature.HasEmbeddedTimeStamp)
{
if (embeddedTimestampVerifyResult)
System.Console.WriteLine(" Timestamp verification: Timestamp is valid.");
else
System.Console.WriteLine(" Timestamp verification: Timestamp is valid.");
}
// print certificate verification details
// if certificate chain is present
if (certificateChain != null)
{
// if certificate verification is successful
if (certificateVerifyResult)
{
System.Console.WriteLine(" Certificate verification: Signer's certificate is valid.");
}
// if certificate verification is NOT successful
else
{
// print certificate verification status
System.Console.WriteLine(" Certificate verification: Signer's certificate is invalid:");
foreach (System.Security.Cryptography.X509Certificates.X509ChainStatus status in certificateChain.ChainStatus)
System.Console.Write(string.Format(" {0}: {1}", status.Status, status.StatusInformation));
}
}
// if timestamp certificate chain is present
if (timestampCertificateChain != null)
{
// if timestamp certificate verification is successful
if (embeddedTimestampCertificateVerifyResult)
{
System.Console.WriteLine(" Timestamp certificate verification: Signer's certificate is valid.");
}
// if timestamp certificate verification is NOT successful
else
{
// print certificate verification status
System.Console.WriteLine(" Timestamp certificate verification: Signer's certificate is invalid:");
foreach (System.Security.Cryptography.X509Certificates.X509ChainStatus status in timestampCertificateChain.ChainStatus)
System.Console.Write(string.Format(" {0}: {1}", status.Status, status.StatusInformation));
}
}
// if signature is not verified
if (!signatureVerifyResult)
return false;
// if signature does NOT cover the whole document and page content was modified
if (!signatureCoversWholeDocument && pageContentModified)
return false;
// if signature certificate is NOT verified
if (!certificateVerifyResult)
return false;
if (signature.HasEmbeddedTimeStamp)
{
// if timestamp is NOT verified
if (!embeddedTimestampVerifyResult)
return false;
// if timestamp certifiacet is NOT verified
if (!embeddedTimestampCertificateVerifyResult)
return false;
}
// sigature is VALID
return true;
}
Inheritance Hierarchy
System.Object
Vintasoft.Imaging.Pdf.Tree.PdfTreeNodeBase
Vintasoft.Imaging.Pdf.Tree.DigitalSignatures.PdfSignatureInformation
Requirements
Target Platforms: .NET9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5
See Also
Reference
PdfSignatureInformation Members
Vintasoft.Imaging.Pdf.Tree.DigitalSignatures Namespace
PdfPkcsSignature
SignatureInfo