A small bash script to re-sign iOS applications.

floatsign.sh

# !/bin/bash

# Copyright (c) 2011 Float Mobile Learning
# http://www.floatlearning.com/
#
# Permission is hereby granted, free of charge, to any person obtaining 
# a copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation 
# the rights to use, copy, modify, merge, publish, distribute, sublicense, 
# and/or sell copies of the Software, and to permit persons to whom the 
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included 
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Please let us know about any improvements you make to this script!
# ./sign source identity -p "path/to/profile" -e "path/to/entitlements" target

if [ $# -lt 3 ]; then
	echo "usage: $0 source identity [-p provisioning] [-e entitlements] target" >&2
	exit 1
fi

ORIGINAL_FILE="$1"
CERTIFICATE="$2"
NEW_PROVISION=
ENTITLEMENTS=

OPTIND=3
while getopts p:e: opt; do
	case $opt in
		p)
			NEW_PROVISION="$OPTARG"
			echo "Specified provisioning profile: $NEW_PROVISION" >&2
			;;
		e)
			ENTITLEMENTS="$OPTARG"
			echo "Specified signing entitlements: $ENTITLEMENTS" >&2
			;;
		\?)
			echo "Invalid option: -$OPTARG" >&2
			exit 1
			;;
		:)
			echo "Option -$OPTARG requires an argument." >&2
			exit 1
			;;
	esac
done

shift $((OPTIND-1))

NEW_FILE="$1"

# Check if the supplied file is an ipa or an app file
if [ "${ORIGINAL_FILE##*.}" = "ipa" ]
	then
		# Unzip the old ipa quietly
		unzip -q "$ORIGINAL_FILE" -d temp
elif [ "${ORIGINAL_FILE##*.}" = "app" ]
	then
		# Copy the app file into an ipa-like structure
		mkdir -p "temp/Payload"
		cp -Rf "$ORIGINAL_FILE" "temp/Payload/$ORIGINAL_FILE"
else
	echo "Error: Only can resign .app files and .ipa files." >&2
	exit
fi

# Set the app name
# The app name is the only file within the Payload directory
APP_NAME=$(ls temp/Payload/)
echo "APP_NAME=$APP_NAME" >&2

# Replace the embedded mobile provisioning profile
if [ "$NEW_PROVISION" != "" ]; then
	echo "Adding the new provision: $NEW_PROVISION"
	cp "$NEW_PROVISION" "temp/Payload/$APP_NAME/embedded.mobileprovision"
fi

# Resign the application
echo "Resigning application using certificate: $CERTIFICATE" >&2
if [ "$ENTITLEMENTS" != "" ]; then
	echo "Using Entitlements: $ENTITLEMENTS" >&2
	/usr/bin/codesign -f -s "$CERTIFICATE" --entitlements="$ENTITLEMENTS" "temp/Payload/$APP_NAME"
else
	/usr/bin/codesign -f -s "$CERTIFICATE" "temp/Payload/$APP_NAME"
fi

# Repackage quietly
echo "Repackaging as $NEW_FILE"

# Zip up the contents of the temp folder
# Navigate to the temporary directory (sending the output to null)
# Zip all the contents, saving the zip file in the above directory
# Navigate back to the orignating directory (sending the output to null)
pushd temp > /dev/null
zip -qry ../temp.ipa *
popd > /dev/null

# Move the resulting ipa to the target destination
mv temp.ipa "$NEW_FILE"

# Remove the temp directory
rm -rf "temp"

Would it be possible to modify the script so that it resigns using the same identity? I'm using Xamarin, and it lacks the equivalent of a build script phase, so any scripts modifying the app during build also breaks the signing.

Would it be possible to modify the script so that it resigns using the same identity? I'm using Xamarin, and it lacks the equivalent of a build script phase, so any scripts modifying the app during build also breaks the signing.

Added the option to use another keychain: https://gist.github.com/derFunk/02890dc8a78a56c28491

Does this fake codesign apps?

AirSign (http://www.airsignapp.com) is doing the same but with a GUI.

romainbiard, thanks for the link to AirSign, it worked for me to resign the app.

I was not able to use AirSign, but this script worked like a charm.Good work!

Code-signed IPA runs on iOS7 but not on iOS8. please help me.

the float script doesn’t work on ipas with extensions and plugin. here my solution http://www.xgiovio.com/blog-photos-videos-other/blog/resign-your-ios-ipa-frameworks-and-plugins-included/