blob: 215d40a6502177969266b4e331aab67ea53c894c [file] [log] [blame]
Junio C Hamano944ce252018-05-30 22:25:261<?xml version="1.0" encoding="UTF-8"?>
Junio C Hamanoc6c919b2016-07-06 21:34:152<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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5<head>
6<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
Junio C Hamano944ce252018-05-30 22:25:267<meta name="generator" content="AsciiDoc 8.6.10" />
Junio C Hamanoc6c919b2016-07-06 21:34:158<title>Git signature format</title>
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192div.quoteblock > div.attribution {
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197div.verseblock > pre.content {
198 font-family: inherit;
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203 text-align: left;
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259 list-style-type: lower-roman;
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265div.compact ul, div.compact ol,
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268 margin-top: 0.1em;
269 margin-bottom: 0.1em;
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272tfoot {
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383span.maroon { color: maroon; }
384span.navy { color: navy; }
385span.olive { color: olive; }
386span.purple { color: purple; }
387span.red { color: red; }
388span.silver { color: silver; }
389span.teal { color: teal; }
390span.white { color: white; }
391span.yellow { color: yellow; }
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393span.aqua-background { background: aqua; }
394span.black-background { background: black; }
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399span.lime-background { background: lime; }
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402span.olive-background { background: olive; }
403span.purple-background { background: purple; }
404span.red-background { background: red; }
405span.silver-background { background: silver; }
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417div.unbreakable { page-break-inside: avoid; }
418
419
420/*
421 * xhtml11 specific
422 *
423 * */
424
425div.tableblock {
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427 margin-bottom: 1.5em;
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430 border: 3px solid #527bbd;
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432thead, p.table.header {
433 font-weight: bold;
434 color: #527bbd;
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440div.tableblock > table[frame="void"] {
441 border-style: none;
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449 border-bottom-style: none;
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451
452
453/*
454 * html5 specific
455 *
456 * */
457
458table.tableblock {
459 margin-top: 1.0em;
460 margin-bottom: 1.5em;
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463 font-weight: bold;
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514
515
516/*
517 * manpage specific
518 *
519 * */
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521body.manpage h1 {
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524 border-top: 2px solid silver;
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537
538
539</style>
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543
544/////////////////////////////////////////////////////////////////////
545// Table Of Contents generator
546/////////////////////////////////////////////////////////////////////
547
548/* Author: Mihai Bazon, September 2002
549 * http://students.infoiasi.ro/~mishoo
550 *
551 * Table Of Content generator
552 * Version: 0.4
553 *
554 * Feel free to use this script under the terms of the GNU General Public
555 * License, as long as you do not remove or alter this notice.
556 */
557
558 /* modified by Troy D. Hanson, September 2006. License: GPL */
559 /* modified by Stuart Rackham, 2006, 2009. License: GPL */
560
561// toclevels = 1..4.
562toc: function (toclevels) {
563
564 function getText(el) {
565 var text = "";
566 for (var i = el.firstChild; i != null; i = i.nextSibling) {
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570 text += getText(i);
571 }
572 return text;
573 }
574
575 function TocEntry(el, text, toclevel) {
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577 this.text = text;
578 this.toclevel = toclevel;
579 }
580
581 function tocEntries(el, toclevels) {
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583 var re = new RegExp('[hH]([1-'+(toclevels+1)+'])');
584 // Function that scans the DOM tree for header elements (the DOM2
585 // nodeIterator API would be a better technique but not supported by all
586 // browsers).
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591 if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
592 result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
593 }
594 iterate(i);
595 }
596 }
597 }
598 iterate(el);
599 return result;
600 }
601
602 var toc = document.getElementById("toc");
603 if (!toc) {
604 return;
605 }
606
607 // Delete existing TOC entries in case we're reloading the TOC.
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609 var i;
610 for (i = 0; i < toc.childNodes.length; i++) {
611 var entry = toc.childNodes[i];
612 if (entry.nodeName.toLowerCase() == 'div'
613 && entry.getAttribute("class")
614 && entry.getAttribute("class").match(/^toclevel/))
615 tocEntriesToRemove.push(entry);
616 }
617 for (i = 0; i < tocEntriesToRemove.length; i++) {
618 toc.removeChild(tocEntriesToRemove[i]);
619 }
620
621 // Rebuild TOC entries.
622 var entries = tocEntries(document.getElementById("content"), toclevels);
623 for (var i = 0; i < entries.length; ++i) {
624 var entry = entries[i];
625 if (entry.element.id == "")
626 entry.element.id = "_toc_" + i;
627 var a = document.createElement("a");
628 a.href = "#" + entry.element.id;
629 a.appendChild(document.createTextNode(entry.text));
630 var div = document.createElement("div");
631 div.appendChild(a);
632 div.className = "toclevel" + entry.toclevel;
633 toc.appendChild(div);
634 }
635 if (entries.length == 0)
636 toc.parentNode.removeChild(toc);
637},
638
639
640/////////////////////////////////////////////////////////////////////
641// Footnotes generator
642/////////////////////////////////////////////////////////////////////
643
644/* Based on footnote generation code from:
645 * http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
646 */
647
648footnotes: function () {
649 // Delete existing footnote entries in case we're reloading the footnodes.
650 var i;
651 var noteholder = document.getElementById("footnotes");
652 if (!noteholder) {
653 return;
654 }
655 var entriesToRemove = [];
656 for (i = 0; i < noteholder.childNodes.length; i++) {
657 var entry = noteholder.childNodes[i];
658 if (entry.nodeName.toLowerCase() == 'div' && entry.getAttribute("class") == "footnote")
659 entriesToRemove.push(entry);
660 }
661 for (i = 0; i < entriesToRemove.length; i++) {
662 noteholder.removeChild(entriesToRemove[i]);
663 }
664
665 // Rebuild footnote entries.
666 var cont = document.getElementById("content");
667 var spans = cont.getElementsByTagName("span");
668 var refs = {};
669 var n = 0;
670 for (i=0; i<spans.length; i++) {
671 if (spans[i].className == "footnote") {
672 n++;
673 var note = spans[i].getAttribute("data-note");
674 if (!note) {
675 // Use [\s\S] in place of . so multi-line matches work.
676 // Because JavaScript has no s (dotall) regex flag.
677 note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
678 spans[i].innerHTML =
679 "[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
680 "' title='View footnote' class='footnote'>" + n + "</a>]";
681 spans[i].setAttribute("data-note", note);
682 }
683 noteholder.innerHTML +=
684 "<div class='footnote' id='_footnote_" + n + "'>" +
685 "<a href='#_footnoteref_" + n + "' title='Return to text'>" +
686 n + "</a>. " + note + "</div>";
687 var id =spans[i].getAttribute("id");
688 if (id != null) refs["#"+id] = n;
689 }
690 }
691 if (n == 0)
692 noteholder.parentNode.removeChild(noteholder);
693 else {
694 // Process footnoterefs.
695 for (i=0; i<spans.length; i++) {
696 if (spans[i].className == "footnoteref") {
697 var href = spans[i].getElementsByTagName("a")[0].getAttribute("href");
698 href = href.match(/#.*/)[0]; // Because IE return full URL.
699 n = refs[href];
700 spans[i].innerHTML =
701 "[<a href='#_footnote_" + n +
702 "' title='View footnote' class='footnote'>" + n + "</a>]";
703 }
704 }
705 }
706},
707
708install: function(toclevels) {
709 var timerId;
710
711 function reinstall() {
712 asciidoc.footnotes();
713 if (toclevels) {
714 asciidoc.toc(toclevels);
715 }
716 }
717
718 function reinstallAndRemoveTimer() {
719 clearInterval(timerId);
720 reinstall();
721 }
722
723 timerId = setInterval(reinstall, 500);
724 if (document.addEventListener)
725 document.addEventListener("DOMContentLoaded", reinstallAndRemoveTimer, false);
726 else
727 window.onload = reinstallAndRemoveTimer;
728}
729
730}
731asciidoc.install();
732/*]]>*/
733</script>
734</head>
735<body class="article">
736<div id="header">
737<h1>Git signature format</h1>
738</div>
739<div id="content">
740<div class="sect1">
741<h2 id="_overview">Overview</h2>
742<div class="sectionbody">
743<div class="paragraph"><p>Git uses cryptographic signatures in various places, currently objects (tags,
744commits, mergetags) and transactions (pushes). In every case, the command which
745is about to create an object or transaction determines a payload from that,
746calls gpg to obtain a detached signature for the payload (<code>gpg -bsa</code>) and
747embeds the signature into the object or transaction.</p></div>
748<div class="paragraph"><p>Signatures always begin with <code>-----BEGIN PGP SIGNATURE-----</code>
749and end with <code>-----END PGP SIGNATURE-----</code>, unless gpg is told to
750produce RFC1991 signatures which use <code>MESSAGE</code> instead of <code>SIGNATURE</code>.</p></div>
751<div class="paragraph"><p>The signed payload and the way the signature is embedded depends
752on the type of the object resp. transaction.</p></div>
753</div>
754</div>
755<div class="sect1">
756<h2 id="_tag_signatures">Tag signatures</h2>
757<div class="sectionbody">
758<div class="ulist"><ul>
759<li>
760<p>
761created by: <code>git tag -s</code>
762</p>
763</li>
764<li>
765<p>
766payload: annotated tag object
767</p>
768</li>
769<li>
770<p>
771embedding: append the signature to the unsigned tag object
772</p>
773</li>
774<li>
775<p>
776example: tag <code>signedtag</code> with subject <code>signed tag</code>
777</p>
778</li>
779</ul></div>
780<div class="listingblock">
781<div class="content">
782<pre><code>object 04b871796dc0420f8e7561a895b52484b701d51a
783type commit
784tag signedtag
785tagger C O Mitter &lt;committer@example.com&gt; 1465981006 +0000
786
787signed tag
788
789signed tag message body
790-----BEGIN PGP SIGNATURE-----
791Version: GnuPG v1
792
793iQEcBAABAgAGBQJXYRhOAAoJEGEJLoW3InGJklkIAIcnhL7RwEb/+QeX9enkXhxn
794rxfdqrvWd1K80sl2TOt8Bg/NYwrUBw/RWJ+sg/hhHp4WtvE1HDGHlkEz3y11Lkuh
7958tSxS3qKTxXUGozyPGuE90sJfExhZlW4knIQ1wt/yWqM+33E9pN4hzPqLwyrdods
796q8FWEqPPUbSJXoMbRPw04S5jrLtZSsUWbRYjmJCHzlhSfFWW4eFd37uquIaLUBS0
797rkC3Jrx7420jkIpgFcTI2s60uhSQLzgcCwdA2ukSYIRnjg/zDkj8+3h/GaROJ72x
798lZyI6HWixKJkWw8lE9aAOD9TmTW9sFJwcVAzmAuFX2kUreDUKMZduGcoRYGpD7E=
799=jpXa
800-----END PGP SIGNATURE-----</code></pre>
801</div></div>
802<div class="ulist"><ul>
803<li>
804<p>
805verify with: <code>git verify-tag [-v]</code> or <code>git tag -v</code>
806</p>
807</li>
808</ul></div>
809<div class="listingblock">
810<div class="content">
811<pre><code>gpg: Signature made Wed Jun 15 10:56:46 2016 CEST using RSA key ID B7227189
812gpg: Good signature from "Eris Discordia &lt;discord@example.net&gt;"
813gpg: WARNING: This key is not certified with a trusted signature!
814gpg: There is no indication that the signature belongs to the owner.
815Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189
816object 04b871796dc0420f8e7561a895b52484b701d51a
817type commit
818tag signedtag
819tagger C O Mitter &lt;committer@example.com&gt; 1465981006 +0000
820
821signed tag
822
823signed tag message body</code></pre>
824</div></div>
825</div>
826</div>
827<div class="sect1">
828<h2 id="_commit_signatures">Commit signatures</h2>
829<div class="sectionbody">
830<div class="ulist"><ul>
831<li>
832<p>
833created by: <code>git commit -S</code>
834</p>
835</li>
836<li>
837<p>
838payload: commit object
839</p>
840</li>
841<li>
842<p>
843embedding: header entry <code>gpgsig</code>
844 (content is preceded by a space)
845</p>
846</li>
847<li>
848<p>
849example: commit with subject <code>signed commit</code>
850</p>
851</li>
852</ul></div>
853<div class="listingblock">
854<div class="content">
855<pre><code>tree eebfed94e75e7760540d1485c740902590a00332
856parent 04b871796dc0420f8e7561a895b52484b701d51a
857author A U Thor &lt;author@example.com&gt; 1465981137 +0000
858committer C O Mitter &lt;committer@example.com&gt; 1465981137 +0000
859gpgsig -----BEGIN PGP SIGNATURE-----
860 Version: GnuPG v1
861
862 iQEcBAABAgAGBQJXYRjRAAoJEGEJLoW3InGJ3IwIAIY4SA6GxY3BjL60YyvsJPh/
863 HRCJwH+w7wt3Yc/9/bW2F+gF72kdHOOs2jfv+OZhq0q4OAN6fvVSczISY/82LpS7
864 DVdMQj2/YcHDT4xrDNBnXnviDO9G7am/9OE77kEbXrp7QPxvhjkicHNwy2rEflAA
865 zn075rtEERDHr8nRYiDh8eVrefSO7D+bdQ7gv+7GsYMsd2auJWi1dHOSfTr9HIF4
866 HJhWXT9d2f8W+diRYXGh4X0wYiGg6na/soXc+vdtDYBzIxanRqjg8jCAeo1eOTk1
867 EdTwhcTZlI0x5pvJ3H0+4hA2jtldVtmPM4OTB0cTrEWBad7XV6YgiyuII73Ve3I=
868 =jKHM
869 -----END PGP SIGNATURE-----
870
871signed commit
872
873signed commit message body</code></pre>
874</div></div>
875<div class="ulist"><ul>
876<li>
877<p>
878verify with: <code>git verify-commit [-v]</code> (or <code>git show --show-signature</code>)
879</p>
880</li>
881</ul></div>
882<div class="listingblock">
883<div class="content">
884<pre><code>gpg: Signature made Wed Jun 15 10:58:57 2016 CEST using RSA key ID B7227189
885gpg: Good signature from "Eris Discordia &lt;discord@example.net&gt;"
886gpg: WARNING: This key is not certified with a trusted signature!
887gpg: There is no indication that the signature belongs to the owner.
888Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189
889tree eebfed94e75e7760540d1485c740902590a00332
890parent 04b871796dc0420f8e7561a895b52484b701d51a
891author A U Thor &lt;author@example.com&gt; 1465981137 +0000
892committer C O Mitter &lt;committer@example.com&gt; 1465981137 +0000
893
894signed commit
895
896signed commit message body</code></pre>
897</div></div>
898</div>
899</div>
900<div class="sect1">
901<h2 id="_mergetag_signatures">Mergetag signatures</h2>
902<div class="sectionbody">
903<div class="ulist"><ul>
904<li>
905<p>
906created by: <code>git merge</code> on signed tag
907</p>
908</li>
909<li>
910<p>
911payload/embedding: the whole signed tag object is embedded into
912 the (merge) commit object as header entry <code>mergetag</code>
913</p>
914</li>
915<li>
916<p>
917example: merge of the signed tag <code>signedtag</code> as above
918</p>
919</li>
920</ul></div>
921<div class="listingblock">
922<div class="content">
923<pre><code>tree c7b1cff039a93f3600a1d18b82d26688668c7dea
924parent c33429be94b5f2d3ee9b0adad223f877f174b05d
925parent 04b871796dc0420f8e7561a895b52484b701d51a
926author A U Thor &lt;author@example.com&gt; 1465982009 +0000
927committer C O Mitter &lt;committer@example.com&gt; 1465982009 +0000
928mergetag object 04b871796dc0420f8e7561a895b52484b701d51a
929 type commit
930 tag signedtag
931 tagger C O Mitter &lt;committer@example.com&gt; 1465981006 +0000
932
933 signed tag
934
935 signed tag message body
936 -----BEGIN PGP SIGNATURE-----
937 Version: GnuPG v1
938
939 iQEcBAABAgAGBQJXYRhOAAoJEGEJLoW3InGJklkIAIcnhL7RwEb/+QeX9enkXhxn
940 rxfdqrvWd1K80sl2TOt8Bg/NYwrUBw/RWJ+sg/hhHp4WtvE1HDGHlkEz3y11Lkuh
941 8tSxS3qKTxXUGozyPGuE90sJfExhZlW4knIQ1wt/yWqM+33E9pN4hzPqLwyrdods
942 q8FWEqPPUbSJXoMbRPw04S5jrLtZSsUWbRYjmJCHzlhSfFWW4eFd37uquIaLUBS0
943 rkC3Jrx7420jkIpgFcTI2s60uhSQLzgcCwdA2ukSYIRnjg/zDkj8+3h/GaROJ72x
944 lZyI6HWixKJkWw8lE9aAOD9TmTW9sFJwcVAzmAuFX2kUreDUKMZduGcoRYGpD7E=
945 =jpXa
946 -----END PGP SIGNATURE-----
947
948Merge tag 'signedtag' into downstream
949
950signed tag
951
952signed tag message body
953
954# gpg: Signature made Wed Jun 15 08:56:46 2016 UTC using RSA key ID B7227189
955# gpg: Good signature from "Eris Discordia &lt;discord@example.net&gt;"
956# gpg: WARNING: This key is not certified with a trusted signature!
957# gpg: There is no indication that the signature belongs to the owner.
958# Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189</code></pre>
959</div></div>
960<div class="ulist"><ul>
961<li>
962<p>
963verify with: verification is embedded in merge commit message by default,
964 alternatively with <code>git show --show-signature</code>:
965</p>
966</li>
967</ul></div>
968<div class="listingblock">
969<div class="content">
970<pre><code>commit 9863f0c76ff78712b6800e199a46aa56afbcbd49
971merged tag 'signedtag'
972gpg: Signature made Wed Jun 15 10:56:46 2016 CEST using RSA key ID B7227189
973gpg: Good signature from "Eris Discordia &lt;discord@example.net&gt;"
974gpg: WARNING: This key is not certified with a trusted signature!
975gpg: There is no indication that the signature belongs to the owner.
976Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189
977Merge: c33429b 04b8717
978Author: A U Thor &lt;author@example.com&gt;
979Date: Wed Jun 15 09:13:29 2016 +0000
980
981 Merge tag 'signedtag' into downstream
982
983 signed tag
984
985 signed tag message body
986
987 # gpg: Signature made Wed Jun 15 08:56:46 2016 UTC using RSA key ID B7227189
988 # gpg: Good signature from "Eris Discordia &lt;discord@example.net&gt;"
989 # gpg: WARNING: This key is not certified with a trusted signature!
990 # gpg: There is no indication that the signature belongs to the owner.
991 # Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189</code></pre>
992</div></div>
993</div>
994</div>
995</div>
996<div id="footnotes"><hr /></div>
997<div id="footer">
998<div id="footer-text">
Junio C Hamano2ef0ba32018-01-26 23:13:53999Last updated
Junio C Hamano6b7d2152019-04-16 12:51:151000 2018-01-27 08:11:04 JST
Junio C Hamanoc6c919b2016-07-06 21:34:151001</div>
1002</div>
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1004</html>