Just a dead simple "password cracker" that will brute force your plain lowercased passwords (letters only, no numbers or capitals).

simple-cracker.pl

#!/usr/bin/perl

# Simple password cracker. Tries every combination of plain lowercased
# passwords, from "a", "b", ..., "z", "aa", "ab", ... "az", "ba", "bb" ...

use 5.18.0;
use Time::HiRes qw(time);
use Digest::MD5 qw(md5_hex);

my $victim = $ARGV[0];
if (!defined $victim) {
	print "Hash to crack: ";
	chomp(my $victim = <STDIN>);
}

my $start = time();

my $passwd = 'a';
while (1) {
	if (md5_hex($passwd) eq $victim) {
		my $elapsed = time() - $start;
		say "I FOUND IT! Your password was $passwd";
		say "It took me $elapsed seconds to crack.";
		exit(0);
	}
	$passwd++;
}