Introduction

Re-signing an .ipa file means replacing its signing assets so the app can be installed or distributed under a different valid Apple signing identity and provisioning profile. The reliable workflow is to unpack the archive, replace the embedded provisioning profile, remove old signature artifacts, sign nested items first, sign the main app last, verify the result, and then zip the package back into an .ipa.

Understand what you are changing

An .ipa is a ZIP archive that contains Payload/AppName.app. Inside that app bundle, code signing is tied to:

• the certificate identity in your keychain
• the embedded provisioning profile
• the app entitlements
• signatures on nested frameworks, app extensions, and plug-ins

If any of those parts disagree, installation or launch can fail.

Unpack the .ipa and inspect the app bundle

Start by extracting the archive.

cp MyApp.ipa MyApp.zip
unzip -q MyApp.zip -d resign_work
find resign_work/Payload -maxdepth 2 -type f | sort

Identify the application bundle, which will usually be resign_work/Payload/MyApp.app.

Replace the provisioning profile and remove old signature data

Copy the new provisioning profile into the app bundle as embedded.mobileprovision.

cp NewProfile.mobileprovision \
  resign_work/Payload/MyApp.app/embedded.mobileprovision

Then remove the old code signature directory.

rm -rf resign_work/Payload/MyApp.app/_CodeSignature

If the app contains nested frameworks or extensions, you may also need to remove stale signature directories there before re-signing.

Extract entitlements when needed

Some apps require explicit entitlements that match the new provisioning profile. One practical way to inspect the existing entitlements is:

codesign -d --entitlements :- resign_work/Payload/MyApp.app 2>/dev/null > entitlements.plist

Do not blindly reuse old entitlements if they no longer match the new team, app identifier, or capabilities. Entitlements must be compatible with the new provisioning profile.

Sign nested content before the main app

This order matters. If the app bundle contains frameworks, app extensions, or plug-ins, sign those first and sign the main app last.

A simplified signing example for a framework and the main app looks like this:

1codesign -f -s "Apple Distribution: Example Corp" \
2  resign_work/Payload/MyApp.app/Frameworks/MyFramework.framework
3
4codesign -f -s "Apple Distribution: Example Corp" \
5  --entitlements entitlements.plist \
6  resign_work/Payload/MyApp.app

For real-world apps, sign all nested frameworks, .appex bundles, and plug-ins before the final app signature.

Verify before repackaging

Never skip verification. A codesign command succeeding does not automatically mean the result is installable.

codesign -vvv --deep --strict resign_work/Payload/MyApp.app
security cms -D -i resign_work/Payload/MyApp.app/embedded.mobileprovision > /tmp/profile_check.plist

Check that:

• the signature verifies
• the provisioning profile belongs to the expected team
• the entitlements match the intended capabilities

This is the point where you catch many subtle re-signing mistakes before device installation.

Rebuild the .ipa

Once verification succeeds, zip the payload back into an .ipa.

cd resign_work
zip -qry ../MyApp-resigned.ipa Payload
cd -

The resulting archive can then be tested on the intended devices or distribution path.

Re-signing is not a way around Apple platform rules

Re-signing can adapt an existing app to a new valid signing context, but it does not bypass platform restrictions. If the bundle identifier, capabilities, or embedded content are incompatible with the new profile, re-signing alone will not fix that.

Likewise, do not assume you can freely re-sign any arbitrary third-party app for redistribution. Legal, security, and platform-policy limits still apply.

Common Pitfalls

• Replacing the provisioning profile but forgetting to remove old signature data.
• Signing the main app before nested frameworks or app extensions.
• Reusing entitlements that no longer match the new provisioning profile.
• Verifying only with hope instead of running codesign -vvv --deep --strict.
• Treating re-signing as a universal fix for bundle ID, capability, or policy mismatches.

Summary

• Re-signing an .ipa means updating its signing identity, provisioning profile, and related signature artifacts.
• Unzip the archive, replace embedded.mobileprovision, and clear stale signatures.
• Sign nested frameworks and extensions first, then sign the main app last.
• Verify the signature and profile before rebuilding the .ipa.
• Re-signing works only when the new signing assets are actually compatible with the app bundle.