From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Newsgroups: gmane.emacs.help Subject: Re: Let us see how to encrypt with Emacs? Date: Fri, 9 Jul 2021 13:52:39 +0200 Message-ID: <20210709115239.GB3074@tuxteam.de> References: <83mtqvdb4s.fsf@gnu.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="oC1+HKm2/end4ao3" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24847"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/1.5.21 (2010-09-15) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jul 09 13:53:26 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 1m1p4Q-0006EH-Cd for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 09 Jul 2021 13:53:26 +0200 Original-Received: from localhost ([::1]:54562 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1p4O-0003PH-TI for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 09 Jul 2021 07:53:24 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:45486) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1p3s-0003Os-Nh for help-gnu-emacs@gnu.org; Fri, 09 Jul 2021 07:52:52 -0400 Original-Received: from mail.tuxteam.de ([5.199.139.25]:44181) by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.90_1) (envelope-from ) id 1m1p3p-0000g7-EB; Fri, 09 Jul 2021 07:52:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tuxteam.de; s=mail; h=From:In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:Date; bh=4m8JR4eoey43rAl7CQB3JQnQuxgPF/H+qBqBjW+2CK8=; b=Lj4GUdSpfw4l1P4/aPAfOUvl4nIzMJhHAojNgr64Dhdv2bfBkmF5MV1AJHCrPoJi7WGCgq0QqHEjfi3F/oHXead38WZPcRw7zxgEUS2YqrxOJ8qqB/YNFKuGefLh2YIhQdL+au1jvyVtdDHi+X4yPEMP2m6mBRy6OrX0UhWg92tLnF7/swz99RriUYXZiBp8ng02hA+bcEiqL/Dp7nOpm1k41Osepiw2gdjNBgrv5Zk7Z50bw1DshJmduZqkLd0oSSr9gOtIXLPwy3cpGBJmm/ecB2UuFAbS+VQkr8AtTk8bV6Rqpb43uDi7rKbgQQHoJCZHo8PBUcLFoCD181pEKg==; Original-Received: from tomas by mail.tuxteam.de with local (Exim 4.80) (envelope-from ) id 1m1p3g-0003t1-0i; Fri, 09 Jul 2021 13:52:40 +0200 Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=5.199.139.25; envelope-from=tomas@tuxteam.de; helo=mail.tuxteam.de X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=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:131634 Archived-At: --oC1+HKm2/end4ao3 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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. >=20 > I guess something like this unless I am making an error: >=20 > (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. I'm not sure you want to encrypt a zero bytes string at all, but this might get philosophical) - MAX is an unfortunate variable name for that. Chunksize, blocksize or some relative or abbrev might be better - Using twice the same var name in a (let* ...) looks confusing. To me, at least. > > What kind of help? To use these functions, you need to learn about > > the various ciphers and what they require. This is something the > > Emacs Lisp reference manual cannot teach you. > >=20 > > > =E2=80=98STRING=E2=80=99 > > > A string as input will be used directly. It may be modified by = the > > > function (unlike most other Emacs Lisp functions) to reduce the > > > chance of exposing sensitive data after the function does its work. > > >=20 > > > I am trying to use list with STRING as following and that does not wo= rk: > > >=20 > > > (gnutls-symmetric-encrypt "CHACHA20-64" (string-pad "MyPassword987" 3= 2) (make-string 16 (random 100)) '(STRING "Text to encrypt")) > >=20 > > What do you mean by "does not work"? >=20 > I get invalid object argument: STRING so I do not understand how to use S= TRING there. No, no. The STRING in the manual is meta-syntactic. It's saying that "when the arg is a string". You are providing a two-element list. Try (warning: untested!): (gnutls-symmetric-encrypt "CHACHA20-64" (string-pad "MyPassword987" 32) (= make-string 16 (random 100)) "Text to encrypt") Cheers - t --oC1+HKm2/end4ao3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAmDoOIcACgkQBcgs9XrR2kb1MwCfaeSsHmEIhc+fJSq8g34JXCey DJ4AnRW+b/jfEmKzYH2mhLY/ck9lC6W4 =YATw -----END PGP SIGNATURE----- --oC1+HKm2/end4ao3--