# Any chance to sign with SHA1?

**URL:** <https://www.finalbuilder.com/forums/t/any-chance-to-sign-with-sha1/7739>\
**Category:** Discussions\
**Created:** [November 5, 2025, 12:50pm UTC](https://www.finalbuilder.com/forums/t/any-chance-to-sign-with-sha1/7739 "2025-11-05T12:50:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![uraabe](https://www.finalbuilder.com/forums/user_avatar/www.finalbuilder.com/uraabe/32/2502_2.png) [@uraabe](https://www.finalbuilder.com/forums/u/uraabe)\
**Post date:** [November 5, 2025, 12:50pm UTC](https://www.finalbuilder.com/forums/t/any-chance-to-sign-with-sha1/7739/1 "2025-11-05T12:50:57Z")

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I have a small number of applications being used on systems with Windows 7 and Windows XP. These are usually isolated (controllers of CNC machines), so signing is not a high priority requirement. Nevertheless I used to (double) sign these files, too, mostly for consistency.

While moving the sign process of all my build configurations to Signotaur, I realized that signing with SHA1 (and thus double signing) is no longer possible.

Rest assured, that won’t make me stop the switch, but I would just like to ask if there is a (hidden) possibility for signing with SHA1.

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**Author:** ![Sparky](https://www.finalbuilder.com/forums/user_avatar/www.finalbuilder.com/sparky/32/10_2.png) [@Sparky](https://www.finalbuilder.com/forums/u/Sparky)\
**Post date:** [November 6, 2025, 10:51am UTC](https://www.finalbuilder.com/forums/t/any-chance-to-sign-with-sha1/7739/2 "2025-11-06T10:51:53Z")

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Hi Uwe,

As you’ve noted, SHA-1 signing isn’t currently supported in Signotaur, and there’s no hidden switch for it.

However, following your request, we’ve started working on adding a dual-signing option (including SHA-1) today, and we’ll have a new version available on Monday.

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<div class="post-metadata">

**Author:** ![Sparky](https://www.finalbuilder.com/forums/user_avatar/www.finalbuilder.com/sparky/32/10_2.png) [@Sparky](https://www.finalbuilder.com/forums/u/Sparky)\
**Post date:** [November 11, 2025, 6:11am UTC](https://www.finalbuilder.com/forums/t/any-chance-to-sign-with-sha1/7739/3 "2025-11-11T06:11:59Z")

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Hi Uwe,

[Version 1.1.0.55](https://www.finalbuilder.com/forums/t/signotaur-v1-1-0-55-released/7740) adds a `--sha1|--add-sha1-signature` command line option to allow dual-signing with an additional SHA-1 signature for legacy Windows versions.