bin/crack_pdf

   1 #! /bin/bash
   2 usage()
   3 {
   4 cat << EOF
   5 usage $0 options
   6
   7 This script will decrypt any pdf given to it. The correct password has to be passed.
   8
   9 REQUIRES qpdf
  10
  11 OPTIONS:
  12  -h                 Shows this message
  13  -p <password>      The password to be used
  14  -v                 Verbose output
  15 EOF
  16 }
  17
  18 # checks if 'qpdf' is installed
  19 type -P qpdf &>/dev/null || { echo "I require qpdf but it's not installed.  Aborting." >&2; exit 1; }
  20
  21 PWD=
  22
  23 while getopts "hp:v" OPT; do
  24     case $OPT in
  25         h)
  26             usage
  27             exit EXIT_SUCCESS
  28             ;;
  29         p)
  30             PWD=$OPTARG
  31             ;;
  32         v)
  33             VERBOSE=1
  34             ;;
  35         ?)
  36             usage
  37             exit
  38             ;;
  39     esac
  40     shift $((OPTIND-1))
  41 done
  42
  43 ARGS=$@
  44 if [[ -z $ARGS ]] || [[ -z $PWD ]] || ! type -P qpdf &> /dev/null; then
  45     usage
  46     exit
  47 fi
  48
  49 shopt -s nullglob       # w/o this '*.pdf' will return the string if no pdfs are in the folder
  50 for DST in $ARGS; do
  51     if [[ -d $DST ]]; then
  52         for F in $DST/*.pdf; do
  53             [[ $VERBOSE ]] && echo $F
  54             mv $F tmp.pdf
  55             qpdf --password=$PWD --decrypt $F ${F%.pdf}_.pdf || echo "error"
  56
  57         done
  58     elif [[ ${DST##*.} = "pdf" ]] && [[ -f $DST ]]; then
  59         [[ $VERBOSE ]] && echo $DST
  60         qpdf --password=$PWD --decrypt $DST ${DST%.pdf}_.pdf
  61     fi
  62 done