packdat/multiple signatures + improvements + eu digital signature compliant

[matheus-kirchesch]

This PR is a continuation of the PR #5, I have made these changes to the custom PDF Sharp on our company private project, but thought of bringing it here also.

[matheus-kirchesch]

@packdat , @julienrffr

[julienrffr]

Hi @matheus-kirchesch
That's awesome, thank you for sharing!
I'll take a look when I have some time for sure.

Could you also open a PR to the original empira's PdfSharp repo? https://github.com/empira/PDFsharp
I guess now we will wait for the original repo to have a stable 6.2 PROD release (as it is now embedding signature feature) before integrating new features on our pdfsharp-extended branch/nuget. So we don't have a divergence too big.

[julienrffr]

can't remember right now but I think there was a reason to have it as an unsigned attribute.

[matheus-kirchesch]

I am not sure what this reason would be, but it makes sense to have it signed, it is the signature time and making it signed means it can not be changed

[matheus-kirchesch]

Hi @matheus-kirchesch That's awesome, thank you for sharing! I'll take a look when I have some time for sure.

Could you also open a PR to the original empira's PdfSharp repo? https://github.com/empira/PDFsharp I guess now we will wait for the original repo to have a stable 6.2 PROD release (as it is now embedding signature feature) before integrating new features on our pdfsharp-extended branch/nuget. So we don't have a divergence too big.

Sure, you mean after they merge this PR? empira#48

[julienrffr]

@matheus-kirchesch 6.2.0 has just been released and it now natively includes the signature part.

I did not check yet if 6.2.0 already supports multiple signatures, but if it's not the case, work from @packdat and yours have to be rebased onto 6.2.0 in order to sync with native signature code.