Due to a problem with the File::HomeDir Perl module on recent versions of MacOS, the usual one-step instructions for installing Crypt::HSXKPasswd from CPAN don’t work on Macs ATM (June 2019).


sudo cpan -f -I File::HomeDir
sudo cpan Crypt::HSXKPasswd

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You may have noticed that on this site, links that open in a new tab get a nice icon to indicate that fact, and, links to domains outside of this site automatically open in a new tab and get that icon. This is achieved using a collection of JavaScript code that I have released as open source under the name bartificer.linkToolkit.js, and published on GitHub.

The code was inspired by some examples in the Programming by Stealth series, and, that same series provided the impetus to give the project some final fit and finish before releasing version 1.0 today.

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I’ve just published a release of backup.pl, my simple perl-based generic backup script. You can download the release, and get full documentation on the project’s GitHub page.

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This post is part 25 of 92 in the series Programming by Stealth

This instalment is a little unusual – rather than learning new topics, and then demonstrating them with a few simple examples, we’re going to look at a real-world JavaScript API, see how it works, and in so doing, reinforce what we’ve already learned, and expand our knowledge a little.

The library we’ll be examining is bartificer.linkToolkit.js, a small open source library I released over the weekend. This library bundles some functions for manipulating links in HTML documents. The two main functions of the library are to ensure that links with a target of _blank also specify a rel of noopener (for security reasons), and, to automatically make links leading out of the site open in a new tab, and denoting that fact with an icon appended to the end of the links. You can see the library in use right here on this page!

We’ll be looking at the library from three points of view – the actual JavaScript code, the JSDoc comments, and the documentation produced from those comments, and, project management.

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While it’s very easy to install hsxkpasswd onto your system from CPAN – it’s literally just one command (see below) – it requires administrator access to the machine.

sudo cpan Crypt::HSXKPasswd

This is all well and good if you have administrator access and are sure you want the module installed system-wide. But, what if you don’t have admin access, or, what if you just want to experiment with the module in your own home directory? The answer is perlbrew, a system for running custom versions of Perl inside your home directory. No need for sudo, and what ever you install with perlbrew is entirely contained within your home directory. If you already have perlbrew installed and configured with a version of Perl greater than or equal to 5.16, you can skip to the final step. If not, you’ll need to make your way through all the steps.

Step 1 – Install perlbrew Into Your Home Dir

There are a few different ways of installing perlbrew, but I find the following method the simplest:

curl -L http://install.perlbrew.pl | bash

That should install perlbrew into your home directory, and it should tell you to append some code to the end of your ~/.bash_profile file, which you can do with the following command:

echo 'source ~/perl5/perlbrew/etc/bashrc' >> ~/.bash_profile

Once that’s done, close your Terminal window and open a new one (this is to pick up the new environment variables defined in ~/perl5/perlbrew/etc/bashrc). You’ll know the install has been successful if you can run the perlbrew command:

perlbrew version

Step 2 – Install a Compatible Version of Perl into perlbrew

The joy of perlbrew is that you can have as many versions of Perl installed at any one time as you like, and you can then switch between them with the perlbrew command.

You can install Crypt::HSXKpasswd, and hence the hsxkpasswd terminal command, into any version of Perl greater than or equal to 5.16.

The following command will install Perl 5.16 into perlbrew:

perlbrew install perl-5.16.0

Go off and make yourself a cup of your favourite beverage – this will take a while! 🙂

Once the install finally finishes, you can activate that version of perl (just on your account) with the command:

perlbrew switch perl-5.16.0

It’s important to note that if at any stage you want to disable perlbrew and get back to the default system version of perl, the command to do so is:

perlbrew off

Step 3 – Enable the perlbrew CPAN Client

If you haven’t already done so, enable the perlbrew CPAN client cpanm with the command:

perlbrew install-cpanm

Step 4 – Install Crypt::HSXKPasswd

Once you have perlbrew installed and configured with a compatible version of perl, you can install Crypt::HSXKPasswd with the following simple command:

cpanm Crypt::HSXKPasswd

You’ll know it’s worked if you can run the hsxkpasswd terminal command:

hsxkpasswd --version

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This is the second part of a two-part post – read part 1 here.

In part 1 we learned how to use the command line too hsxkpasswd to generate passwords, and how to use various flags to specify custom password generation configurations, and word sources. In this second part we’ll look at how to save these customisations for future use with .hsxkpasswdrc files.

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Since version 3.5, the Crypt::HSXKPasswd password generating perl module ships with a command line interface to the password generator called hsxkpasswd. This provides a way for non-Perl programers to access the vast majority of the module’s functionality.

The easiest way to install the module, and it’s accompanying terminal command is via CPAN:

sudo cpan Crypt::HSXKPasswd

Once the module is installed, you’ll have access to the hsxkpasswd terminal command.

Getting started is simple, run the command with no arguments at all and it will generate one password using the default settings:

bart-iMac2013:~ bart$ hsxkpasswd
bart-iMac2013:~ bart$

If you want more passwords, pass a number as an argument, and you’ll get that many passwords:

bart-iMac2013:~ bart$ hsxkpasswd 10
bart-iMac2013:~ bart$

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The latest stable release of both the Crypt::HSXKPasswd perl module, and the hsxkpassd terminal command are now available through CPAN: http://search.cpan.org/perldoc?Crypt%3A%3AHSXKPasswd

The library and terminal command are bundled together, and can be installed onto Unix/Linux/Mac OS X computers in the standard CPAN way:

sudo cpan Crypt::HSXKPasswd

When this install finishes, both the terminal command and perl module will be available for use on the system, along with the documentation for both:

man hsxkpasswd
perldoc Crypt::HSXKPasswd

Even though I’ve put a lot of time an effort into creating these tools, I’ve chosen to released them entirely free of charge, and with a very liberal open-source license (BSD). If you find either the terminal command or Perl module useful, please consider making a donation below to help cover my time and costs.

If you find a bug, would like to suggest a change or improvement, or would like to contribute code to the project, please use the project’s GitHub page.

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Firstly, thanks to everyone who runs beta versions of Crypt::HSXKPasswd – every bug you find makes the software that little bit better!

However, now that the software is in CPAN, many of you may well want to move away from the stand-alone beta releases, and start getting the module directly from CPAN. Before you install the module from CPAN, you should remove the beta from your system. You can do that in two easy steps:

  1. Install pm-uninstall from CPAN: sudo cpan App::pmuninstall
  2. Use pm-uninstall to remove the beta version of Crypt::HSXKPasswd: sudo pm-uninstall Crypt::HSXKPasswd

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This is a quick-start guide to using the free and open source Crypt::HSXKPasswd Perl module for generating secure but memorable passwords.

As I write this post the module is not on CPAN yet, and still in beta form. The module can be downloaded from the project’s GitHub page.

This article assumes you have the module installed – you’ll find installation instructions here.

Before we get stuck into some sample code, let’s first summarise the module’s philosophy.

The module is built around the idea of using common words as a kind of lattice around which to build passwords that are long, have a wide coverage of characters, and yet are still memorable. An ideal HSXKPasswd password will contain a mix of upper and lower case letters, some digits, and some symbols.

The module starts building a password by randomly closing a given number of words from a given dictionary. There can then be an optional number of digits added as pseudo words to the front and/or the back of the initial list of words. Next, a symbol can be used to separate the words, and finally a symbol can be used to pad the front and/or back of the password.

Think of it like this:

correct HORSE BATTERY staple
23 correct HORSE BATTERY staple 45

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