ISPP.dll and signature

Pascal Quélen

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Jun 10, 2025, 12:46:42 AM6/10/25

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Hi,

I have modified ISPP.dll to support pascal script for pre processing.
I use modified ISPP since long time and i recompile my ISPP for each new innosetup version.
Since ISPP signature is checked with ISPP.dll.issig i can't do it now because my new ISPP is rejected by innosetup.

Is it possible to modify ISPP and use it with inno setup with the new signature mecanism ?
Is it possible to recompile ISPP.dll without recompiling InnoSetup ?

Martijn Laan

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Jun 10, 2025, 1:15:42 AM6/10/25

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It the current version it's not possible to turn of this verification but in the next version it will be.

Greetings,

Martijn

Op di 10 jun , Pascal Quélen <pascal...@gmail.com> schreef:

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Gavin Lambert

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Jun 10, 2025, 1:27:13 AM6/10/25

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On Tuesday, June 10, 2025 at 5:15:42 PM UTC+12 Martijn Laan wrote:

It the current version it's not possible to turn of this verification but in the next version it will be.

Perhaps rather than (or as well as) turning it off, there could be an IDE setting or similar to let the compiler trust additional signatures?

Martijn Laan

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Jun 10, 2025, 1:52:16 AM6/10/25

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The two public keys it trusts are hardcoded and protected by the Authenticode signature. Allowing non-protected keys would render the verification useless.

Do note that if you would rebuild not just ISPP.dll but also the IDE by using the build script then automatically one of the two built-in keys will be your own instead of one of mine.

Greetings,

Martijn

Op di 10 jun , Gavin Lambert <i...@mirality.co.nz> schreef:

On Tuesday, June 10, 2025 at 5:15:42 PM UTC+12 Martijn Laan wrote:

It the current version it's not possible to turn of this verification but in the next version it will be.

Perhaps rather than (or as well as) turning it off, there could be an IDE setting or similar to let the compiler trust additional signatures?

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t.sl...@gmail.com

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Jun 20, 2025, 6:03:23 AM6/20/25

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Hello.

We had the same issue with signatures in Graphical Installer for Inno Setup.

At this moment we rebuilt the .dll completely without this feature.

When new version is released we can reconsider this approach.

Martijn Laan

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Jun 20, 2025, 9:21:55 AM6/20/25

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Hi,

Op vrijdag 20 juni 2025 om 12:03 schreef t.sl...@gmail.com <t.sl...@gmail.com>:

We had the same issue with signatures in Graphical Installer for Inno Setup.

Can you elaborate which issue you had and why? Does Graphical Installer modify one of the Inno Setup files?

At this moment we rebuilt the .dll completely without this feature.

Which .dll?

Greetings,

Martijn

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