VerifySignature returns false for valid Signature

[alexbor]

Hi Guys,
I’ve attached the "PW HA 161117.pdf" which contains the e-signed field. If I open the file in the Adobe Acrobat Reader and click on the e-signed field it says: “Signature is valid” (see attached AcrobatReader.png), but the Spire.PDF returns ‘false’ for the PdfSignatureFieldWidget.VerifySignature() method and also returns ‘true’ for the PdfSignatureFieldWidget.VerifyDocModified() method.
Full source code is attached. See MainForm.cs.
I am using the Spire.PDF (version 3.9.431).
For other pdf files the Spire.PDF works as expected.
Is it possible to validate the signature field using the Spire.PDF as it done in the Acrobat Reader?

Alexey

[Jane.Bai]

Hello,

Thanks for your inquiry.
I have reproduced the issue. I will look into it and reply you ASAP.

Sibncerely,
Jane
E-iceblue support team

[Jane.Bai]

Hello alexbor,

The issue is delivered to our dev team for a further investigation and fixing. Once there's any update, I will inform you.
Sorry for the inconvenience caused.

Sincerely,
Jane
E-iceblue support team

[alexbor]

Thank you, waiting for the fix.

Alexey.

[alexbor]

Hello Jane.Bai,

Do you know when the fix will be ready?

Alexey

[Jane.Bai]

Dear Alexey,

Thanks for contacting us.
Sorry there's no significant progress so far.
I will ask our dev team to push it forward. Once there's any update, I will inform you.

Sincerely,
Jane
E-iceblue support team

[alexbor]

Dear Jane,
Sorry for pressing, but I need this be resolved ASAP.

Has the IceBlue encountered this type of problem before?
Do devs know what's causing this issue?

Alexey.

[Jane.Bai]

Hello,

Thanks for contacting us.
Sorry there's still no update due to the complexity of this issue. Actually, a similar issue had been reported before and had been resolved, but since every document has it's own structure and items, the cause might not be the same. Our dev team is still working on it. Once I got any news from our dev team, I will let you know.

Sincerely,
Jane
E-iceblue support team

[PhilW]

Hi Jane,

I'm experiencing the same type of probem.

Are you able to provide any update regarding when a fix is likely to be completed or the current position (i.e. Is it being actively investigated/do you know the root cause of the issue)? This problem is causing additional levels of effort for our operations team as they're having to manually review each set of signed documents.

Many thanks,

Phil

[Jane.Bai]

Hello Phil,

Thanks for contacting us.
Sorry the issue is still under investigation due to it's complexity. If possible, could you please send your sample document to us([email protected])? Maybe we could find a breakthrough point in your document on this issue.

Sincerely,
Jane
E-iceblue support team

[PhilW]

Hi Jane,

The document will be the same as the one provided by Alexey as he works on our offshore dev team.

[Jane.Bai]

Hi Phil,

Thanks for your response.
Our dev team is still looking for solutions, I will notify both you and Alexey when the issue has been resolved.

Sincerely,
Jane
E-iceblue support team

[PhilW]

HI Jane,

Is there any update? This ticket has now been open a while (1 month), do you have any idea when we're likely to get an idea on the resolution or at least a more detailed update of how your dev team are getting on with their investigation?

Phil

[Jane.Bai]

Hello Phil,

Thanks for contacting us.
Sorry the issue is still pending due to the complexity. Considering your urgent situation, we have given the highest priority to your case. Once there are any findings, I will notify you.
We apologize for the inconvenience caused.

Sincerely,
Jane
E-iceblue support team

[PhilW]

Hi Jane,

Is there any update?