Digital Signature PdfSignature.IsLocked produces invalid signature
Hello, i have an issue that appeared (was working fine before in previous releases)
when i add a second signature and set the PdfSignature.IsLocked=true , the second signature becomes invalid.
can you please check the reason and fix it and even in validation process there is no detection for the signature issue
check attached file
Attachment: pdfv1.3_invalid_112dd2dc.zip
Hi Jacobs,
We were able to reproduce the reported issue with the provided details on our end, and currently, we are analyzing it. We will provide further details on July 4, 2024.
Regards,
Jeyalakshmi T
We have confirmed the issue “Signature is invalid after lock the signature in the document” as a defect in our product and we will include the fix in weekly release on 16th July 2024.
Please use the below feedback link to track the status of the reported bug.
Note: If you require a patch for the reported issue in any of our Essential Studio Main or SP release version, then kindly let us know the version, so that we can provide a patch in that version based on our SLA policy.
Disclaimer: “Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.”
Thanks, that's great ... if possible to include the fix in this weekly release 9th July 2024
Hi jacobs,
We will deliver the custom patch for the issue "Signature is invalid after lock the signature in the document"
tomorrow on 9th July 2024 and the fix will be included in our upcoming weekly release on 16th July 2024
Regards,
Raashith Ahamed S
Hi Jacobs,
We have created the custom NuGet for the issue "Signature is invalid after lock the signature in the document" in the latest version(26.1.41). Kindly download the NuGet from the below link
NuGet Link:
Regards,
Jeyalakshmi T
We have included the fix for this issue "Signature is invalid after lock the signature in the document" in our latest weekly release (26.1.42).Please download the Nuget from the below link
Nuget Link: NuGet Gallery | Syncfusion.Pdf.WinForms 26.1.42
Root Cause: The digital signature is used to ensure the identity of the signer. Also, we enable the lock permission for the signature, so no other changes are allowed to be made to the signed document. We have encountered a problem with adding digest information when locking the signature, which causes the signature to become invalid after locking the signature field.
i confirm that latest version fixed the issue ... thanks
but how can i detect the invalid signature produced by the previous version while validating with new version?
Thank you for the update.
We have an option to detect whether the signature is valid or not using Digital Signature Validation. Currently, we are facing an issue with this API for a particular document. We are working on validating this and will provide further updates on July 23, 2024.
We have confirmed the issue “Signature is valid for invalid signature after validating the signature in pdf” as a defect in our product and we will include the fix in weekly release on 30th July 2024
Please use the below feedback link to track the status of the reported bug.
Note: If you require a patch for the reported issue in any of our Essential Studio Main or SP release version, then kindly let us know the version, so that we can provide a patch in that version based on our SLA policy.
Disclaimer: “Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.”
We were unable to include the fix for the issue "Signature is valid for invalid signature after validating the signature in pdf" as promised in this weekly release. This fix will be included in the next weekly release (6th August 2024).
If you would like to verify the fix before the next release, we can provide you with a custom patch. Please let us know if you are interested.
We apologize for any inconvenience this may have caused and appreciate your understanding.
Regards,
Jeyalakshmi T
thanks for the update ... if you can provide a custom patch on the last released nuget ... that would be great in order to test the fix.
Hi Jacobs,
We have created the custom NuGet for the issue "Signature is valid for invalid signature after validating the signature in pdf" in the latest version (26.2.7). Kindly download the NuGet from the below link
Regards,
Raashith Ahamed
We have included the fix for this issue "Signature is valid for invalid signature after validating the signature in pdf" in our latest weekly release (26.2.8).Please download the Nuget from the below link
Nuget Link: NuGet Gallery | Syncfusion.Pdf.WinForms 26.2.8
Root Cause: When validating the signature, we retrieve properties such as Certified, DocumentModified, SignatureValidity, etc. In this document,isSignatureValid returns true because signature lock is not considered while validating the signature.This issue causes the signature to be marked as valid when it is actually invalid.
i have noticed that you modified the IsDocumentModified to return true in this case ,
but unfortunately now any valid locked document by adobe the IsDocumentModified returns true which is incorrect.
i hope you fix this issue in next weekly release . see attached
Note that this was working properly in version 26.2.7
Attachment: adobelock_c02575fc.zip
Hi Jacob
Thank you for the update.
We have reproduced the reported issue and are currently in the process of validating it. We will provide further details by September 3, 2024.
Regards,
Anantha Gokula Raman J
Due to complexity, The reported issue still need a lot more in-depth research; thus we are looking into them. On 5th September 2024, further information will be updated.
Hi Jacobs,
We have confirmed the issue “IsDocumentModified returns an incorrect result after validating the existing PDF signature.” as a defect in our product and we will include the fix in upcoming Volume 3 main release
Please use the below feedback link to track the status of the reported bug.
Note: If you require a patch for the reported issue in any of our Essential Studio Main or SP release version, then kindly let us know the version, so that we can provide a patch in that version based on our SLA policy.
Disclaimer: “Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.”
Regards,
Raashith Ahamed
Thanks ... can you please provide a patch for current latest version 26.2.13 .net framework
And when will volume 3 be released?
We have planned to provide the custom patch for the mentioned version on September 10th, 2024. The 2024 Volume 3 release is expected in the 3rd week of September. We will let you know once the release has been rolled out.
We have created the custom NuGet for the issue “IsDocumentModified returns an incorrect result after validating the existing PDF signature.” in mentioned version 26.2.13.
Kindly download the NuGet from the below link
NuGet Link:
We are glad to announce that our Essential Studio 2024 Volume 3 Main Release v27.1.48 is rolled out. We have included the fix "IsDocumentModified returns an incorrect result after validating the existing PDF signature." in our Volume 3 release and is available for download under the following link.
Please use the below feedback link to track the status of the reported bug.
We thank you for your support and appreciate your patience in waiting for this release. Please get in touch with us if you would require any further assistance.
- 22 Replies
- 6 Participants
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JA Jacobs
- Jul 1, 2024 01:57 PM UTC
- Sep 19, 2024 12:39 PM UTC
