Decrypt app on a jailbroken iDevice

decrypt.sh

#!/bin/bash

if [ "$#" -lt 1 ]; then
  echo "ERROR: Missing argument." >&2
  echo "Usage: $0 --list|<name>"
  exit 1
fi

if [ "$#" -gt 1 ]; then
  echo "ERROR: Too many arguments." >&2
  echo "Usage: $0 --list|<name>"
  exit 1
fi

for cmd in awk plutil zip; do
  if ! [ -x "$(command -v "$cmd")" ]; then
    echo "ERROR: $cmd not found." >&2
    exit 1
  fi
done

if [ "$1" = "--list" ]; then
  echo /var/containers/Bundle/Application/*/*.app | tr ' ' '\n' | awk -F/ '{ print $NF }' | sed 's/\.app$//' | sort
  exit
fi

for bundle in /var/containers/Bundle/Application/*/"$1".app; do
  echo "Processing: $bundle"
  cd "$(mktemp -d)"
  start=$SECONDS
  cp -r "$bundle/.." Payload
  #find "$bundle" -type f -executable | while read -r bin; do
  for bin in "$bundle/$1"; do
    echo "Decrypting: $bin"
    relpath=${bin%/*.app}
    output="Payload/$1.app/$relpath"
    if [ -x "$(command -v fouldecrypt)" ]; then
      if [ -x "$(command -v sudo)" ]; then
        sudo fouldecrypt "$bin" "$relpath"
      else
        su root -c "fouldecrypt \"$bin\" \"$relpath\""
      fi
    elif [ -x "$(command -v flexdecrypt)" ]; then
      if [ -x "$(command -v sudo)" ]; then
        sudo flexdecrypt "$bin" --output "$output"
      else
        su root -c "flexdecrypt \"$bin\" --output \"$relpath\""
      fi
    else
      echo "ERROR: No decryption tools found, please install fouldecrypt or flexdecrypt." >&2
      exit 1
    fi
  done
  bundleid=$(plutil -key CFBundleIdentifier "$bundle/Info.plist")
  version=$(plutil -key CFBundleShortVersionString "$bundle/Info.plist")
  ipa="/var/mobile/Documents/${bundleid}_${version}.ipa"
  echo "Zipping: $ipa"
  zip -FS -r "$ipa" Payload >/dev/null
  rm -rf "$(realpath .)"
  echo "Completed in $((SECONDS - start))s"
  echo
done