### Installing ideviceinstaller on Ubuntu/Debian/Mint

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Instructions to install ideviceinstaller on Ubuntu, Debian, or Mint using apt-get, which is required for testing zsign's installation features.

```bash
sudo apt-get install -y ideviceinstaller
```

--------------------------------

### Installing ideviceinstaller on macOS

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Instructions to install ideviceinstaller on macOS using Homebrew, which is a prerequisite for testing zsign's installation capabilities.

```bash
brew install ideviceinstaller
```

--------------------------------

### Installing EPEL Release for RHEL/CentOS/Alma/Rocky 8

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Instructions to install the EPEL (Extra Packages for Enterprise Linux) release repository for RHEL, CentOS, Alma, or Rocky Linux 8, which is a prerequisite for installing zsign dependencies.

```bash
sudo rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
```

--------------------------------

### Compiling zsign on RHEL/CentOS/Alma/Rocky

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Instructions to install development dependencies like git, gcc-c++, pkg-config, openssl-devel, and minizip1.2-devel using yum, and then compile zsign on RHEL, CentOS, Alma, or Rocky Linux after EPEL is installed.

```bash
sudo yum install -y git gcc-c++ pkg-config openssl-devel minizip1.2-devel
git clone https://github.com/zhlynn/zsign.git
cd zsign/build/linux
make clean && make
```

--------------------------------

### Injecting Dylib into IPA and Re-signing

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of injecting a dynamic library (`demo.dylib`) into an existing IPA file and then re-signing it using a P12 certificate and mobile provisioning profile.

```bash
./zsign -k dev.p12 -p 123 -m dev.prov -l demo.dylib -o output.ipa demo.ipa
```

--------------------------------

### Installing EPEL Release for RHEL/CentOS/Alma/Rocky 9

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Instructions to install the EPEL (Extra Packages for Enterprise Linux) release repository for RHEL, CentOS, Alma, or Rocky Linux 9, which is a prerequisite for installing zsign dependencies.

```bash
sudo rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
```

--------------------------------

### Signing IPA with Private Key and Mobile Provisioning

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of signing an IPA file using a private key (`privkey.pem`), a mobile provisioning profile (`dev.prov`), specifying an output IPA file, and setting the compression level.

```bash
./zsign -k privkey.pem -m dev.prov -o output.ipa -z 9 demo.ipa
```

--------------------------------

### Compiling zsign on Ubuntu/Debian/Mint

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Instructions to compile zsign on Ubuntu, Debian, or Mint, including installing development dependencies like git, g++, pkg-config, libssl-dev, and libminizip-dev, then cloning the repository and building the project.

```bash
sudo apt-get install -y git g++ pkg-config libssl-dev libminizip-dev
git clone https://github.com/zhlynn/zsign.git
cd zsign/build/linux
make clean && make
```

--------------------------------

### Injecting Dylib (LC_LOAD_WEAK_DYLIB) into Mach-O Executable

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of injecting a dynamic library into a Mach-O executable using the `LC_LOAD_WEAK_DYLIB` load command, which allows the application to run even if the dylib is missing.

```bash
./zsign -w -l "@executable_path/demo.dylib" demo.app/execute
```

--------------------------------

### Compiling zsign on macOS

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Instructions to compile zsign on macOS, including installing necessary dependencies like pkg-config, openssl, and minizip, followed by cloning the repository and building the project using make.

```bash
brew install pkg-config openssl minizip
git clone https://github.com/zhlynn/zsign.git
cd zsign/build/macos
make clean && make
```

--------------------------------

### Performing Ad-Hoc Signing on an IPA

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of performing an ad-hoc signature on an IPA file, which allows for signing without a specific provisioning profile, suitable for internal testing.

```bash
./zsign -a -o output.ipa demo.ipa
```

--------------------------------

### Injecting Dylib (LC_LOAD_DYLIB) into Mach-O Executable

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of injecting multiple dynamic libraries into a Mach-O executable using the `LC_LOAD_DYLIB` load command, suitable for direct modification of an app's binary.

```bash
./zsign -a -l "@executable_path/demo1.dylib" -l "@executable_path/demo2.dylib" demo.app/execute
```

--------------------------------

### Signing Application Folder with P12 and Mobile Provisioning (Cached)

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of signing an application folder using a P12 certificate (`dev.p12`) with its password, a mobile provisioning profile (`dev.prov`), and outputting to an IPA, leveraging zsign's caching mechanism for faster re-signing.

```bash
./zsign -k dev.p12 -p 123 -m dev.prov -o output.ipa demo.app
```

--------------------------------

### Changing Bundle ID and Name During IPA Signing

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of signing an IPA while simultaneously modifying its bundle identifier (`com.new.bundle.id`) and bundle name (`NewName`) using a P12 certificate and mobile provisioning profile.

```bash
./zsign -k dev.p12 -p 123 -m dev.prov -b 'com.new.bundle.id' -n 'NewName' -o output.ipa demo.ipa
```

--------------------------------

### Force Signing Application Folder with P12 and Mobile Provisioning (No Cache)

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Example of force-signing an application folder using a P12 certificate (`dev.p12`) with its password and a mobile provisioning profile (`dev.prov`), explicitly bypassing the signing cache.

```bash
./zsign -f -k dev.p12 -p 123 -m dev.prov -o output.ipa demo.app
```

--------------------------------

### Displaying zsign Command-Line Options

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Shows the general usage syntax and a comprehensive list of command-line options for zsign, including parameters for private keys, provisioning profiles, output files, bundle modifications, and dylib injection.

```bash
Usage: zsign [-options] [-k privkey.pem] [-m dev.prov] [-o output.ipa] file|folder
options:
-k, --pkey              Path to private key or p12 file. (PEM or DER format)
-m, --prov              Path to mobile provisioning profile.
-c, --cert              Path to certificate file. (PEM or DER format)
-a, --adhoc             Perform ad-hoc signature only.
-d, --debug             Generate debug output files. (.zsign_debug folder)
-f, --force             Force sign without cache when signing folder.
-o, --output            Path to output ipa file.
-p, --password          Password for private key or p12 file.
-b, --bundle_id         New bundle id to change.
-n, --bundle_name       New bundle name to change.
-r, --bundle_version    New bundle version to change.
-e, --entitlements      New entitlements to change.
-z, --zip_level         Compressed level when output the ipa file. (0-9)
-l, --dylib             Path to inject dylib file. Use -l multiple time to inject multiple dylib files at once.
-w, --weak              Inject dylib as LC_LOAD_WEAK_DYLIB.
-i, --install           Install ipa file using ideviceinstaller command for test.
-t, --temp_folder       Path to temporary folder for intermediate files.
-2, --sha256_only       Serialize a single code directory that uses SHA256.
-C, --check             Check if the file is signed.
-q, --quiet             Quiet operation.
-v, --version           Shows version.
-h, --help              Shows help (this message).
```

--------------------------------

### Checking Mach-O and Code Signature Info with zsign

Source: https://github.com/zhlynn/zsign/blob/master/README.md

Demonstrates how to use zsign to display information about the Mach-O executable and its code signature segments for a given application bundle.

```bash
./zsign demo.app/demo
```

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