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#!/usr/bin/perl
use lib '../blib/lib';
use Getopt::Std;
use Crypt::CBC;
use strict vars;
my %options;
getopts('edk:i:o:',\%options) || die <<USAGE;
Usage: aes.pl [options] file1 file2 file3...
AES encrypt/decrypt files using Cipher Block Chaining mode.
Options:
-e encrypt (default)
-d decrypt
-k 'key' provide key on command line
-i file input file
-o file output file
(NB: The Rijndael cipher is the basis for AES)
USAGE
;
@ARGV = $options{'i'} if $options{'i'};
push(@ARGV,'-') unless @ARGV;
open(STDOUT,">$options{'o'}") or die "$options{'o'}: $!"
if $options{'o'};
my $key = $options{'k'} || get_key();
my $cipher = Crypt::CBC->new(-key => $key,
-cipher => 'Rijndael',
-salt => 1,
) || die "Couldn't create CBC object";
my $decrypt = $options{'d'} and !$options{'e'};
$cipher->start($decrypt ? 'decrypt' : 'encrypt');
my $in;
while (@ARGV) {
my $file = shift @ARGV;
open(ARGV,$file) || die "$file: $!";
print $cipher->crypt($in) while read(ARGV,$in,1024);
close ARGV;
}
print $cipher->finish;
sub get_key {
local($|) = 1;
local(*TTY);
open(TTY,"/dev/tty");
my ($key1,$key2);
system "stty -echo </dev/tty";
do {
print STDERR "AES key: ";
chomp($key1 = <TTY>);
print STDERR "\r\nRe-type key: ";
chomp($key2 = <TTY>);
print STDERR "\r\n";
print STDERR "The two keys don't match. Try again.\r\n"
unless $key1 eq $key2;
} until $key1 eq $key2;
system "stty echo </dev/tty";
close(TTY);
$key1;
}
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