moth/bin/mktokens

#!/usr/bin/perl
use strict;
use warnings;

use Getopt::Std;
use vars qw( $VERSION @VOWELS @CONSONANTS );

$VERSION = '1.0';

# Digest::BubbleBabble from Benjamin Trott, cpan@stupidfool.org
@VOWELS     = split //, q{aeuioy};
@CONSONANTS = split //, q{bcdfghklmnprstvzx};

sub bubblebabble {
    my ($input) = @_;
	my @dgst = map { ord } split //, $input;
    my $dlen = length $input;

    my $seed = 1;
    my $rounds = int($dlen / 2) + 1;
    my $retval = 'x';
    for my $i (0..$rounds-1) {
        if ($i+1 < $rounds || $dlen % 2) {
            my $idx0 = ((($dgst[2 * $i] >> 6) & 3) + $seed) % 6;
            my $idx1 =   ($dgst[2 * $i] >> 2) & 15;
            my $idx2 =  (($dgst[2 * $i] &  3) + $seed / 6) % 6;
            $retval .= $VOWELS[$idx0] . $CONSONANTS[$idx1] . $VOWELS[$idx2];
            if ($i+1 < $rounds) {
                my $idx3 = ($dgst[2 * $i + 1] >> 4) & 15;
                my $idx4 =  $dgst[2 * $i + 1] & 15;
                $retval .= $CONSONANTS[$idx3] . q/-/ . $CONSONANTS[$idx4];
                $seed = ($seed * 5 + $dgst[2 * $i] * 7 +
                                     $dgst[2 * $i + 1]) % 36;
            }
        } else {
            my $idx0 = $seed % 6;
            my $idx1 = 16;
            my $idx2 = $seed / 6;
            $retval .= $VOWELS[$idx0] . $CONSONANTS[$idx1] . $VOWELS[$idx2];
        }
    }
    $retval .= 'x';
    return $retval;
}
# --- END

sub readch {
	my ($chars, $fh) = @_;
	my $retval = '';
	sysread $fh, $retval, $chars;
	return $retval;
}

sub usage {
	my ($msg) = @_;
	print <<'EOB';
Usage: mktokens [options] count
    -c    category name
    -s    size of token hash [default: 8]
EOB
	die "\n[x] $msg\n" if $msg;
	exit 0;
}

my $count = 1;
my $size  = 8;
my $cat   = '';

my %options=();
getopts('c:s:h', \%options);
usage('not enough arguments!') unless scalar @ARGV > 0;
usage() if $options{h};

$cat   = "$options{c}:1:" if $options{c} and $options{c} =~ m/\A ([[:alnum:]_-]+) \Z/msix;
$size  = $options{s}      if $options{s} and $options{s} =~ m/\A (\d+)            \Z/msix;
$count = $ARGV[0]         if $ARGV[0]    and $ARGV[0]    =~ m/\A (\d+)            \Z/msix;

open my $fh, '<', '/dev/urandom';
print {*STDERR} "[+] Generating $count token", ($count > 1 ? 's' : ''), " [$size bytes of entropy]", $cat ? " with prefix '$cat'" : '', $/;
print $cat, bubblebabble(readch($size, $fh)), $/ for (1 .. $count);
close $fh;