From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: About randomity, entropy, random passwords - was Re: Noob dumb question (extending emacs) Date: Mon, 25 Oct 2021 22:56:47 +0300 Message-ID: References: <875ytnzka1.fsf@zoho.eu> <87h7d6zrx9.fsf@zoho.eu> <87fssqxp1s.fsf@zoho.eu> <878rygopki.fsf@zoho.eu> <8735ooopan.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="6755"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Oct 25 22:05:52 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mf6EC-0001TU-0r for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 25 Oct 2021 22:05:52 +0200 Original-Received: from localhost ([::1]:49958 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mf6EA-00076V-B4 for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 25 Oct 2021 16:05:50 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52966) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mf69P-0001mF-B4 for help-gnu-emacs@gnu.org; Mon, 25 Oct 2021 16:00:56 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:45717) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mf69I-0000We-38 for help-gnu-emacs@gnu.org; Mon, 25 Oct 2021 16:00:55 -0400 Original-Received: from localhost ([::ffff:41.75.189.151]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000027F1D.0000000061770CEC.00004580; Mon, 25 Oct 2021 13:00:44 -0700 Mail-Followup-To: help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: <8735ooopan.fsf@zoho.eu> Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:134158 Archived-At: * Emanuel Berg via Users list for the GNU Emacs text editor [2021-10-25 22:53]: > Emanuel Berg via Users list for the GNU Emacs text editor wrote: > > >> (defun rcd-read-urandom (&optional length) > >> "I am also free to modify the Emacs Lisp unlimited times." > >> (shell-command-to-string "head -n 1 /dev/urandom")) > > > > So you had one as well ... > > Check how head does it then ... that's how to get aHEAD in > > software piracy ... > > Wait ... didn't we see it with pwgen? > > You need to write a dynamic module, in C for this. > > /dev/random isn't a regular file ... no can do. I was just testing it, I did not use /dev/urandm ever. It can be done, but that is slow and not portable. This seem to work blazing fast and is portable enough, I expect it to work on any GNU Emacs version. (defun rcd-random-md5-string () (md5 (concat (emacs-uptime) (format-time-string "%N %6N %3N")))) (rcd-random-md5-string) ⇒ "5ae0b5bd4f7bd84a877062b104a8f77f" -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/