Cleaning Up A Generated DKIM Entry for DNS-Webinterfaces

You want to use DKIM, you brave soul? Have you got everything set up? Consequently you asked one of the handy (online) tools spit out a configuration like this:

    oachkatzlschwoaf._domainkey  IN  TXT ( "v=DKIM1; h=sha265; k=rsa; s=email; "
        "p=YXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYX"
		"kahdkahsdkahsdkahdkahsdkahskdhakdhakhdkahdkahdkahdkahdkahdkadkahkdh"
        "ABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB==" )  ; ----- DKIM key oachkatzlschwoaf for domain example.com

So how do you get this into the DNS via your hosters webinterface?

For one, you need the „selector” as the „name” of your DNS entry. In this example, that would be „oachkatzlschwoaf._domainkey”.

The „value” of the DNS entry would be everything within the parentheses. As there is a 255-byte maximum length for a string within a single TXT or SPF RR record and according to RFC 4408 „Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1” a A domain name MUST NOT have multiple record , the published key has to be broken up into multiple strings.
This is exactly what those generators already do for you.

So the „value” in the DNS entry would look like this one once a DKIM checker queried the DNS and parsed the result:

v=DKIM1;H=sha265;k=rsa;s=email;p=YXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB==

HTH

Tagged as: , , , , , | Author:
[Montag, 20170313, 18:52 | permanent link | 0 Kommentar(e)

Comments are closed for this story.


Disclaimer

„Leyrers Online Pamphlet“ ist die persönliche Website von mir, Martin Leyrer. Die hier veröffentlichten Beiträge spiegeln meine Ideen, Interessen, meinen Humor und fallweise auch mein Leben wider.
The postings on this site are my own and do not represent the positions, strategies or opinions of any former, current or future employer of mine.

Me, Elsewhere

Tag Cloud

2007, 2blog, 2do, 2read, a-trust, a.trust, a1, accessability, acta, advent, age, ai, amazon, ankündigung, apache, apple, audio, austria, backup, barcamp, basteln, bba, big brother awards, birthday, blog, blogging, book, books, browser, Browser_-_Firefox, bruce sterling, buch, bürgerkarte, cars, cartoon, ccc, cfp, christmas, cloud, coding, collection, command line, commandline, computer, computing, concert, conference, copyright, covid19, css, database, date, datenschutz, debian, delicious, demokratie, design, desktop, deutsch, deutschland, dev, developer, development, devops, digitalks, dilbert, disobay, dna, dns, Doctor Who, documentation, domino, Domino, Douglas Adams, download, downloads, drm, dsk, dvd, e-card, e-government, e-mail, e-voting, E71, education, Ein_Tag_im_Leben, elga, email, encryption, essen, eu, EU, event, events, exchange, Extensions, fail, fedora, feedback, film, firefox, flash, flightexpress, food, foto, fsfe, fun, future, games, gaming, geek, geld, git, gleichberechtigung, google, graz, grüne, grüninnen, hack, hacker, handtuch, handy, hardware, HHGTTG, history, how-to, howto, hp, html, humor, ibm, IBM, ical, iCalendar, image, innovation, intel, internet, internet explorer, iot, iphone, ipod, isp, IT, it, itfails, itfailsAT, itfailsDE, java, javascript, job, jobmarket, journalismus, keyboard, knowledge, konzert, language, laptop, law, lego, lenovo, life, links, Linux, linux, linuxwochen, linuxwochenende, live, living, lol, london, lost+found, Lotus, lotus, lotus notes, Lotus Notes, LotusNotes, lotusnotes, Lotusphere, lotusphere, Lotusphere2006, lotusphere2007, lotusphere2008, Lotusphere2008, lustig, m3_bei_der_Arbeit, mac, mail, marketing, mathematik, media, medien, metalab, microsoft, Microsoft, mITtendrin, mobile, mood, motivation, movie, mp3, multimedia, music, musik, männer, nasa, nerd, netwatcher, network, netzpolitik, news, nokia, Notes, notes, Notes+Domino, office, online, OOXML, open source, openoffice, opensource, orf, orlando, os, outlook, patents, pc, pdf, performance, perl, personal, php, picture, pictures, podcast, politics, politik, pr, press, presse, privacy, privatsphäre, productivity, programming, protest, public speaking, qtalk, quintessenz, quote, quotes, radio, rant, recherche, recht, release, review, rezension, rip, rss, science, search, security, server, settings, sf, shaarli, Show-n-tell thursday, sicherheit, silverlight, smtp, SnTT, social media, software, sony, sound, space, spam, sprache, spö, ssh, ssl, standards, storage, story, stupid, summerspecial, sun, surveillance, sysadmin, talk, talks, technology, The Hitchhikers Guide to the Galaxy, theme, think, thinkpad, thunderbird, tip, tipp, tools, topgear, torrent, towel, Towel Day, TowelDay, travel, truth, tv, twitter, ubuntu, ui, uk, unix, update, usa, usb, vds, video, videoüberwachung, vienna, Vim, vim, vintage, vista, vorratsdatenspeicherung, vortrag, wahl, wcm, web, web 2.0, web2.0, web20, Web20, webdesign, werbung, wien, wiener linien, wikileaks, windows, windows 7, wired, wishlist, wissen, Wissen_ist_Macht, wlan, work, workshops, wow, writing, wtf, Wunschzettel, wunschzettel, www, xbox, xml, xp, zensur, zukunft, zune, österreich, övp, übersetzung, überwachung

AFK Readinglist