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: Re: Let us see how to encrypt with Emacs? Date: Fri, 9 Jul 2021 15:35:21 +0300 Message-ID: References: <83mtqvdb4s.fsf@gnu.org> <20210709115239.GB3074@tuxteam.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12137"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) Cc: help-gnu-emacs@gnu.org To: tomas@tuxteam.de Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jul 09 14:39:59 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 1m1pnR-0002yl-8v for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 09 Jul 2021 14:39:57 +0200 Original-Received: from localhost ([::1]:36884 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1pnP-0006Q0-T1 for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 09 Jul 2021 08:39:55 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54422) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1pmi-0006OI-HJ for help-gnu-emacs@gnu.org; Fri, 09 Jul 2021 08:39:12 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:60587) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1pmf-0007ft-PL for help-gnu-emacs@gnu.org; Fri, 09 Jul 2021 08:39:12 -0400 Original-Received: from localhost ([::ffff:197.157.34.164]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000057EBC.0000000060E84369.000039F7; Fri, 09 Jul 2021 05:39:05 -0700 Mail-Followup-To: tomas@tuxteam.de, help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: <20210709115239.GB3074@tuxteam.de> 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:131640 Archived-At: * tomas@tuxteam.de [2021-07-09 14:53]: > On Fri, Jul 09, 2021 at 02:32:10PM +0300, Jean Louis wrote: > > * Eli Zaretskii [2021-07-09 13:40]: > > [...] > > > > No, you don't need to chunk, you just need to pad to a multiple of 64 > > > bytes. > > > > I guess something like this unless I am making an error: > > > > (defun pad-to-multiple-bytes (string max) > > "Return string padded to multiple of MAX bytes." > > (let* ((bytes (string-bytes string)) > > (multiple (truncate (/ bytes max))) > > (multiple (if (zerop multiple) max (* (1+ multiple) max)))) > > (string-pad string multiple))) > > small critiques > > - see the `ceiling' function: it does what you want (perhaps > except at zero. Thanks, now I know for that: (defun pad-to-multiple-bytes (string length) "Return string padded to multiple of MAX bytes." (let* ((bytes (string-bytes string)) (multiple (* (ceiling bytes length) length))) (string-pad string multiple))) > I'm not sure you want to encrypt a zero bytes string at all, but > this might get philosophical) There may be problems which I will never encounter practically. I know. > MAX is an unfortunate variable name for that. Now is length. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/