swift

Swift / Objective-C

Swift and Objective-C compile to native machine code; function bodies are gone at compile time. What survives in the binary is the type metadata the Objective-C and Swift runtimes need at run time. disrobe extracts that metadata, demangles it, and reverses the two dominant rename obfuscators so a dump of a shielded binary reads with its original names.

Commands

disrobe swift classdump App.app/App --out dump.json
disrobe swift shield-undo map.txt --out renames.json
disrobe swift confidential-decrypt blob.bin --key 0x55 --out strings.json

disrobe macho classdump App.ipa --out dump.json
disrobe macho dump App.app/App
disrobe macho slices universal.bin

Class-dump

classdump reconstructs the type interface from two metadata sources the runtime leaves in the binary.

The Objective-C side walks __objc_classlist, __objc_catlist, and __objc_protolist to recover classes, categories, protocols, ivars, properties, and method selectors with their type encodings.

The Swift side parses the reflection sections (__swift5_types, __swift5_fieldmd, __swift5_proto) and demangles the symbols to recover type names, stored fields, and conformances.

The output is a header-style interface listing. Beside the JSON it writes a .swift source file with all recovered type declarations. disrobe swift classdump handles single-slice inputs; for fat binaries and .ipa containers use disrobe macho classdump, which walks every slice.

Output shape (illustrative):

swift classdump: OK
  input:        App
  cpu/bits:     arm64 / Bits64
  swift types:  24
  reflected:    18
  mangled syms: 312
  demangled:    312
  swift source: ./out/App-swift.swift
  wrote:        ./out/App-swift.json

Rename-undo

shield-undo reverses a SwiftShield run. SwiftShield renames symbols to high-entropy identifiers and emits an obf ==> original mapping in the .dSYM. disrobe parses that mapping and builds the undo lookup, so a subsequent class-dump of the shielded binary reads with the original names.

confidential-decrypt recovers plaintext strings from a SwiftConfidential XOR-obfuscated blob given its single-byte key (--key, default 0x55).

Mach-O commands

disrobe macho dump reports the header, load commands, segments, sections, and any LC_ENCRYPTION_INFO or LC_ENCRYPTION_INFO_64 records. disrobe macho slices walks a fat binary and reports each slice's CPU type, subtype, and offset.

FairPlay-encrypted regions (App Store DRM) are reported detect-only via LC_ENCRYPTION_INFO: the decryption key is not present in the binary, so class-dump of those regions is an information-theoretic wall.