git.scottworley.com Git - overonion/blob - overonion

   1 #!/bin/bash
   2
   3 if (( $# != 2));then
   4   echo "usage: overonion e|d keyfile"
   5   exit 1
   6 fi
   7 mode=$1
   8 if [[ "$mode" != e && "$mode" != d ]];then
   9   echo "Use 'e' for encrypt or 'd' for decrypt"
  10   exit 1
  11 fi
  12 keyfile=$2
  13 if [[ ! -e "$keyfile" ]];then
  14   echo "Keyfile not found"
  15   exit 1
  16 fi
  17 if [[ ! -r "$keyfile" ]];then
  18   echo "Cannot read keyfile"
  19   exit 1
  20 fi
  21
  22 num_layers=$(wc -l < "$keyfile")
  23 if (( num_layers < 20 ));then
  24   echo "Keyfile doesn't have enough layers to be an onion"
  25   exit 1
  26 fi
  27
  28 if [[ "$mode" == e ]];then
  29   first_layer=$num_layers
  30   next_layer=-1
  31   openssl_decrypt=""
  32 else
  33   first_layer=1
  34   next_layer=1
  35   openssl_decrypt="-d"
  36 fi
  37
  38 function go() {
  39   layer=$1
  40   if (( layer == 0 || layer > num_layers ));then
  41     cat
  42   else
  43     openssl enc $openssl_decrypt "-$(sed -n "${layer}s/ .*//p" "$keyfile")" \
  44             -pass fd:37 37< <(sed -n "${layer}s/^[^ ]* //p" "$keyfile") |
  45     go $(( layer + next_layer ))
  46   fi
  47 }
  48
  49 go "$first_layer"