Cycript: JS/ObjC/Java Hybrid REPL
summary
Cycript is a JavaScript/Objective‑C REPL that now supports Java and runs on Android, adds richer C type signatures and live C interop, and shows concrete tooling: grammar‑assisted tab completion that executes fragments, automatic Clang‑generated bindings for Apple SDKs, heap scavenging via choose to find all instances, and ms_hook to replace native functions. The demo injects into Calculator and SpringBoard, manipulates UI and syscall args, sometimes crashes during low‑level memory work but fundamentally works for rapid closed‑source spelunking.
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chapters (13)
- 0:00Introduction
- 2:33Birth of Cycript
- 5:23What Cycript is
- 9:36Memory and C code
- 13:07Injecting for inspection
- 16:00Bridging Objective-C and JavaScript prototypes
- 20:14Modifying runtime with Substrate
- 23:48Adding Java support
- 28:06Declaring ObjC classes
- 32:20Introspecting iOS apps
- 35:32Swift limits
- 39:08Jailbreak and security
- 41:37Q&A
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