7

How can I remove the code signature from a binary so that I can patch it without the binary refusing to run afterwards?

Needless to say, I'm not the original creator of the binary, nor I have the certs that were used to sign the binary.

  • if the app's name I want to remove the code signature is a two words with space between them, how should I type it? Thanks in advance – user34480 Sep 24 at 2:29
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There are tools for that, as well as a codesign flag --remove-signature

First two should work the same. The codesign flag is undocumented and so YMMV (A user reported in a comment the codesign produced a corrupt executable).

You should use any of them with caution and backup the application before using them.

| improve this answer | |
  • Would you recommend me using one of those 3 tools in particular or any of those would work exactly the same for me and my use case? – alexandernst Sep 30 '16 at 12:13
  • Added the question to address your questions here – NirIzr Sep 30 '16 at 12:24
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    codesign --remove-signature seems to create malformed executables, at least in some cases. – zneak Sep 6 '17 at 16:20
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    @zneak thanks for sharing your experience. Edited my answer to note that. – NirIzr Sep 6 '17 at 16:27
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Another blunt way that seemed to work for me on Catalina (note that this strips all attributes):

xattr -cr /path/to/your/program.app

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codesign --remove-signature /path/to/binaryAppName

Tested it on macOS 10.15.3 Catalina, works perfectly.

You can edit the hex values of the now removed code signature binaries and it will launch on macOS with out a hitch.

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  • This answer doesn't offer any new information. The accepted answer (from 2016) already discusses the codesign --remove-signature approach – julian Mar 19 at 15:40

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