LTV & TSA Signature support

[UnsaDev]

Implement TimeStamping feature
#617

[CLAassistant]

All committers have signed the CLA.

[williamdes]

Why did you open this PR since #617 is open?

[UnsaDev]

Hi William, I thought it was easier to restart from the latest TCPDF version. That is the commit, with Hidaw improvements, I have tested.

[williamdes]

Oh okay, I can force push your work to the original PR then

[UnsaDev]

Do whatever you need.
The most important now is his work merge the project for everybody.

[nicolaasuni]

Please consider adding this feature to the new https://github.com/tecnickcom/tc-lib-pdf library instead.

[UnsaDev]

Lib-tc-pdf is too much change at this time for a lot of dev, your new library is too different and would need to remake all the PDF files. TCPDF is not close to be deprecated as your lib-tc-pdf is far from being equivalent.
So I think it's useful for the TCPDF community to merge it in TCPDF too.
Thank you and best regards,

[williamdes]

Please consider adding this feature to the new https://github.com/tecnickcom/tc-lib-pdf library instead.

I think one way forward is a major version of tcpdf that would be based on the new library. As a wrapper of the new library. Allowing users to keep code compatibility.

[UnsaDev]

Be realists guys, except if your days are not as full as ours, this won't be available before months, probably years.
Be pragmatics, you have something working properly, you can't just tell people they may have something one day, maybe.
Don't forget that A bird in the hand is worth two in the bush.

[UnsaDev]

Okay so I understand you won't merge any commit to TCPDF anymore ?
I see your post in an other thread "I am trying to not accept any new feature for TCPDF so I can deprecate it sooner.". It was in October... 2024. Reality is catching you.
The sooner, not always the better...
No problem, I keep my fork.

[williamdes]

Keep this PR nice and clean, the less lines changed in TCPDF main the better. Use PHPStan to get your code clean etc..
Users will use your work at the end
Also, add examples to cover your code

[nicolaasuni]

Thank you very much, @UnsaDev, for taking @hidasw's timestamping work, testing it against the current TCPDF codebase, and producing this updated and consolidated implementation - it is genuinely appreciated.

TCPDF 6 is now deprecated and no further changes will be merged into this repository. Please see the pinned issue Thank You - and the Future of TCPDF for the full explanation and the path forward.

LTV and TSA signature support is already available in tc-lib-pdf (see examples E007-E009). I fully understand the frustration of needing a working solution today rather than waiting, and I appreciate you being direct about that. If there are capabilities your use case requires that are not yet covered in tc-lib-pdf, feel free to open an issue or discussion there.

I am leaving this PR open in case you or anyone else wishes to continue the discussion, but it is unlikely that this PR will ever be merged.

Thank you again for your patience and understanding.