https://github.com/DerekSelander/yacd

Decrypts FairPlay applications on iOS 13.4.1 and lower, no jb required
https://github.com/DerekSelander/yacd

Last synced: about 2 months ago
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Decrypts FairPlay applications on iOS 13.4.1 and lower, no jb required

• Host: GitHub
• URL: https://github.com/DerekSelander/yacd
• Owner: DerekSelander
• License: mit
• Created: 2020-08-31T04:27:16.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2024-03-19T21:05:45.000Z (9 months ago)
• Last Synced: 2024-07-31T20:44:14.260Z (4 months ago)
• Language: C
• Size: 2.5 MB
• Stars: 683
• Watchers: 23
• Forks: 131
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• fucking-open-source-ios-apps - yacd
• awesome-hacking-lists - DerekSelander/yacd - Decrypts FairPlay applications on iOS 13.4.1 and lower, no jb required (C)

README

        
# yacd (Yet Another Code Decrypter)

Decrypts FairPlay (App Store) applications on iOS 13.4.1 and lower, no jb required

Use for research purposes only, I didn't publish this for you to sideload Fortnite




  



TLDR: build & run

```

> xcodebuild -project ./PsychicStapler.xcodeproj  -scheme yacd -config Debug -sdk iphoneos -arch arm64 -derivedDataPath /tmp/

# upload to jb'd device, refresh UICache

# open an app, open yacd, decrypt

```

This application uses [@s1guza](https://twitter.com/s1guza)'s [Psychic Paper](https://siguza.github.io/psychicpaper/) exploit to be able to read other process memory and the iOS filesystem.

Many alternatives already exist ([original?](https://github.com/stefanesser/dumpdecrypted), [Frida version](https://github.com/AloneMonkey/frida-ios-dump), [past favorite](https://github.com/BishopFox/bfdecrypt)). This was written primarily for a case where I want to get a decrypted IPA from my iOS device and Airdrop it to a computer

## Compile 

You'll need Xcode 12 for the xcproject

Change around the Singing identity and build for an iOS 13.4.1 or lower device. If successful, you'll see the list of GUI applications on your iOS device.

## Usage

First, launch a 3rd party application, then decrypt it from the yacd app (the app whose icon contains [GQ's sexiest man of 2020](https://en.wikipedia.org/wiki/Anthony_Fauci)). Have a receiving computer with Airdrop available nearby.

## Credits 

* [@s1guza](https://twitter.com/s1guza)'s already mentioned [Psychic Paper](https://siguza.github.io/psychicpaper/)  

* [@rodionovme](https://twitter.com/rodionovme)'s [liblorgnette](https://github.com/rodionovd/liblorgnette) as a starting point

* [https://github.com/ZipArchive/ZipArchive](https://github.com/ZipArchive/ZipArchive)

* [https://github.com/SVProgressHUD/SVProgressHUD](https://github.com/SVProgressHUD/SVProgressHUD)

If you make derivatives of this, cite your sources