show_apksignature.sh

#!/bin/bash
#This file is part of The Open GApps script of @mfonville.
#
#    The Open GApps scripts are free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    These scripts are distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#

# Note, for Chrome they changed signatures for Android 7.0 so make sure to pick one of those APKs

SCRIPT="$(readlink -f "$0")"
TOP="$(dirname "$SCRIPT")"
SCRIPTS="$TOP/scripts"

# shellcheck source=scripts/inc.tools.sh
. "$SCRIPTS/inc.tools.sh"
checktools base64 coreutils unzip

for argument in "$@"; do
  file="$(readlink -f "$argument")"
  if [ -f "$file" ]; then
    echo "signature of $file:"
    RSAFILE="META-INF/CERT"
    unzip -l "$file" | grep -q "$RSAFILE.RSA"
    if [ "$?" != "0" ]; then
      RSAFILE="META-INF/GOOGPLAY"
    fi
    unzip -p "$file" "$RSAFILE.RSA" | openssl pkcs7 -inform DER -print_certs | tail -n +4 | head -n -2 | tr -d '\n'
    echo ""
  fi
done