910 lines
42 KiB
HTML
910 lines
42 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta name="generator" content="Asciidoctor 2.0.17">
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<meta name="author" content="brent saner <bts@square-r00t.net>, https://r00t2.io">
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<title>OpenSSH Key Structure Guide</title>
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.admonitionblock td.content>.title,.audioblock>.title,.exampleblock>.title,.imageblock>.title,.listingblock>.title,.literalblock>.title,.stemblock>.title,.openblock>.title,.paragraph>.title,.quoteblock>.title,table.tableblock>.title,.verseblock>.title,.videoblock>.title,.dlist>.title,.olist>.title,.ulist>.title,.qlist>.title,.hdlist>.title{text-rendering:optimizeLegibility;text-align:left;font-family:"Noto Serif","DejaVu Serif",serif;font-size:1rem;font-style:italic}
|
||
|
|
table.tableblock.fit-content>caption.title{white-space:nowrap;width:0}
|
||
|
|
.paragraph.lead>p,#preamble>.sectionbody>[class=paragraph]:first-of-type p{font-size:1.21875em;line-height:1.6;color:rgba(0,0,0,.85)}
|
||
|
|
.admonitionblock>table{border-collapse:separate;border:0;background:none;width:100%}
|
||
|
|
.admonitionblock>table td.icon{text-align:center;width:80px}
|
||
|
|
.admonitionblock>table td.icon img{max-width:none}
|
||
|
|
.admonitionblock>table td.icon .title{font-weight:bold;font-family:"Open Sans","DejaVu Sans",sans-serif;text-transform:uppercase}
|
||
|
|
.admonitionblock>table td.content{padding-left:1.125em;padding-right:1.25em;border-left:1px solid #dddddf;color:rgba(0,0,0,.6);word-wrap:anywhere}
|
||
|
|
.admonitionblock>table td.content>:last-child>:last-child{margin-bottom:0}
|
||
|
|
.exampleblock>.content{border:1px solid #e6e6e6;margin-bottom:1.25em;padding:1.25em;background:#fff;border-radius:4px}
|
||
|
|
.exampleblock>.content>:first-child{margin-top:0}
|
||
|
|
.exampleblock>.content>:last-child{margin-bottom:0}
|
||
|
|
.sidebarblock{border:1px solid #dbdbd6;margin-bottom:1.25em;padding:1.25em;background:#f3f3f2;border-radius:4px}
|
||
|
|
.sidebarblock>:first-child{margin-top:0}
|
||
|
|
.sidebarblock>:last-child{margin-bottom:0}
|
||
|
|
.sidebarblock>.content>.title{color:#7a2518;margin-top:0;text-align:center}
|
||
|
|
.exampleblock>.content>:last-child>:last-child,.exampleblock>.content .olist>ol>li:last-child>:last-child,.exampleblock>.content .ulist>ul>li:last-child>:last-child,.exampleblock>.content .qlist>ol>li:last-child>:last-child,.sidebarblock>.content>:last-child>:last-child,.sidebarblock>.content .olist>ol>li:last-child>:last-child,.sidebarblock>.content .ulist>ul>li:last-child>:last-child,.sidebarblock>.content .qlist>ol>li:last-child>:last-child{margin-bottom:0}
|
||
|
|
.literalblock pre,.listingblock>.content>pre{border-radius:4px;overflow-x:auto;padding:1em;font-size:.8125em}
|
||
|
|
@media screen and (min-width:768px){.literalblock pre,.listingblock>.content>pre{font-size:.90625em}}
|
||
|
|
@media screen and (min-width:1280px){.literalblock pre,.listingblock>.content>pre{font-size:1em}}
|
||
|
|
.literalblock pre,.listingblock>.content>pre:not(.highlight),.listingblock>.content>pre[class=highlight],.listingblock>.content>pre[class^="highlight "]{background:#f7f7f8}
|
||
|
|
.literalblock.output pre{color:#f7f7f8;background:rgba(0,0,0,.9)}
|
||
|
|
.listingblock>.content{position:relative}
|
||
|
|
.listingblock code[data-lang]::before{display:none;content:attr(data-lang);position:absolute;font-size:.75em;top:.425rem;right:.5rem;line-height:1;text-transform:uppercase;color:inherit;opacity:.5}
|
||
|
|
.listingblock:hover code[data-lang]::before{display:block}
|
||
|
|
.listingblock.terminal pre .command::before{content:attr(data-prompt);padding-right:.5em;color:inherit;opacity:.5}
|
||
|
|
.listingblock.terminal pre .command:not([data-prompt])::before{content:"$"}
|
||
|
|
.listingblock pre.highlightjs{padding:0}
|
||
|
|
.listingblock pre.highlightjs>code{padding:1em;border-radius:4px}
|
||
|
|
.listingblock pre.prettyprint{border-width:0}
|
||
|
|
.prettyprint{background:#f7f7f8}
|
||
|
|
pre.prettyprint .linenums{line-height:1.45;margin-left:2em}
|
||
|
|
pre.prettyprint li{background:none;list-style-type:inherit;padding-left:0}
|
||
|
|
pre.prettyprint li code[data-lang]::before{opacity:1}
|
||
|
|
pre.prettyprint li:not(:first-child) code[data-lang]::before{display:none}
|
||
|
|
table.linenotable{border-collapse:separate;border:0;margin-bottom:0;background:none}
|
||
|
|
table.linenotable td[class]{color:inherit;vertical-align:top;padding:0;line-height:inherit;white-space:normal}
|
||
|
|
table.linenotable td.code{padding-left:.75em}
|
||
|
|
table.linenotable td.linenos,pre.pygments .linenos{border-right:1px solid;opacity:.35;padding-right:.5em;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}
|
||
|
|
pre.pygments span.linenos{display:inline-block;margin-right:.75em}
|
||
|
|
.quoteblock{margin:0 1em 1.25em 1.5em;display:table}
|
||
|
|
.quoteblock:not(.excerpt)>.title{margin-left:-1.5em;margin-bottom:.75em}
|
||
|
|
.quoteblock blockquote,.quoteblock p{color:rgba(0,0,0,.85);font-size:1.15rem;line-height:1.75;word-spacing:.1em;letter-spacing:0;font-style:italic;text-align:justify}
|
||
|
|
.quoteblock blockquote{margin:0;padding:0;border:0}
|
||
|
|
.quoteblock blockquote::before{content:"\201c";float:left;font-size:2.75em;font-weight:bold;line-height:.6em;margin-left:-.6em;color:#7a2518;text-shadow:0 1px 2px rgba(0,0,0,.1)}
|
||
|
|
.quoteblock blockquote>.paragraph:last-child p{margin-bottom:0}
|
||
|
|
.quoteblock .attribution{margin-top:.75em;margin-right:.5ex;text-align:right}
|
||
|
|
.verseblock{margin:0 1em 1.25em}
|
||
|
|
.verseblock pre{font-family:"Open Sans","DejaVu Sans",sans-serif;font-size:1.15rem;color:rgba(0,0,0,.85);font-weight:300;text-rendering:optimizeLegibility}
|
||
|
|
.verseblock pre strong{font-weight:400}
|
||
|
|
.verseblock .attribution{margin-top:1.25rem;margin-left:.5ex}
|
||
|
|
.quoteblock .attribution,.verseblock .attribution{font-size:.9375em;line-height:1.45;font-style:italic}
|
||
|
|
.quoteblock .attribution br,.verseblock .attribution br{display:none}
|
||
|
|
.quoteblock .attribution cite,.verseblock .attribution cite{display:block;letter-spacing:-.025em;color:rgba(0,0,0,.6)}
|
||
|
|
.quoteblock.abstract blockquote::before,.quoteblock.excerpt blockquote::before,.quoteblock .quoteblock blockquote::before{display:none}
|
||
|
|
.quoteblock.abstract blockquote,.quoteblock.abstract p,.quoteblock.excerpt blockquote,.quoteblock.excerpt p,.quoteblock .quoteblock blockquote,.quoteblock .quoteblock p{line-height:1.6;word-spacing:0}
|
||
|
|
.quoteblock.abstract{margin:0 1em 1.25em;display:block}
|
||
|
|
.quoteblock.abstract>.title{margin:0 0 .375em;font-size:1.15em;text-align:center}
|
||
|
|
.quoteblock.excerpt>blockquote,.quoteblock .quoteblock{padding:0 0 .25em 1em;border-left:.25em solid #dddddf}
|
||
|
|
.quoteblock.excerpt,.quoteblock .quoteblock{margin-left:0}
|
||
|
|
.quoteblock.excerpt blockquote,.quoteblock.excerpt p,.quoteblock .quoteblock blockquote,.quoteblock .quoteblock p{color:inherit;font-size:1.0625rem}
|
||
|
|
.quoteblock.excerpt .attribution,.quoteblock .quoteblock .attribution{color:inherit;font-size:.85rem;text-align:left;margin-right:0}
|
||
|
|
p.tableblock:last-child{margin-bottom:0}
|
||
|
|
td.tableblock>.content{margin-bottom:1.25em;word-wrap:anywhere}
|
||
|
|
td.tableblock>.content>:last-child{margin-bottom:-1.25em}
|
||
|
|
table.tableblock,th.tableblock,td.tableblock{border:0 solid #dedede}
|
||
|
|
table.grid-all>*>tr>*{border-width:1px}
|
||
|
|
table.grid-cols>*>tr>*{border-width:0 1px}
|
||
|
|
table.grid-rows>*>tr>*{border-width:1px 0}
|
||
|
|
table.frame-all{border-width:1px}
|
||
|
|
table.frame-ends{border-width:1px 0}
|
||
|
|
table.frame-sides{border-width:0 1px}
|
||
|
|
table.frame-none>colgroup+*>:first-child>*,table.frame-sides>colgroup+*>:first-child>*{border-top-width:0}
|
||
|
|
table.frame-none>:last-child>:last-child>*,table.frame-sides>:last-child>:last-child>*{border-bottom-width:0}
|
||
|
|
table.frame-none>*>tr>:first-child,table.frame-ends>*>tr>:first-child{border-left-width:0}
|
||
|
|
table.frame-none>*>tr>:last-child,table.frame-ends>*>tr>:last-child{border-right-width:0}
|
||
|
|
table.stripes-all>*>tr,table.stripes-odd>*>tr:nth-of-type(odd),table.stripes-even>*>tr:nth-of-type(even),table.stripes-hover>*>tr:hover{background:#f8f8f7}
|
||
|
|
th.halign-left,td.halign-left{text-align:left}
|
||
|
|
th.halign-right,td.halign-right{text-align:right}
|
||
|
|
th.halign-center,td.halign-center{text-align:center}
|
||
|
|
th.valign-top,td.valign-top{vertical-align:top}
|
||
|
|
th.valign-bottom,td.valign-bottom{vertical-align:bottom}
|
||
|
|
th.valign-middle,td.valign-middle{vertical-align:middle}
|
||
|
|
table thead th,table tfoot th{font-weight:bold}
|
||
|
|
tbody tr th{background:#f7f8f7}
|
||
|
|
tbody tr th,tbody tr th p,tfoot tr th,tfoot tr th p{color:rgba(0,0,0,.8);font-weight:bold}
|
||
|
|
p.tableblock>code:only-child{background:none;padding:0}
|
||
|
|
p.tableblock{font-size:1em}
|
||
|
|
ol{margin-left:1.75em}
|
||
|
|
ul li ol{margin-left:1.5em}
|
||
|
|
dl dd{margin-left:1.125em}
|
||
|
|
dl dd:last-child,dl dd:last-child>:last-child{margin-bottom:0}
|
||
|
|
li p,ul dd,ol dd,.olist .olist,.ulist .ulist,.ulist .olist,.olist .ulist{margin-bottom:.625em}
|
||
|
|
ul.checklist,ul.none,ol.none,ul.no-bullet,ol.no-bullet,ol.unnumbered,ul.unstyled,ol.unstyled{list-style-type:none}
|
||
|
|
ul.no-bullet,ol.no-bullet,ol.unnumbered{margin-left:.625em}
|
||
|
|
ul.unstyled,ol.unstyled{margin-left:0}
|
||
|
|
li>p:empty:only-child::before{content:"";display:inline-block}
|
||
|
|
ul.checklist>li>p:first-child{margin-left:-1em}
|
||
|
|
ul.checklist>li>p:first-child>.fa-square-o:first-child,ul.checklist>li>p:first-child>.fa-check-square-o:first-child{width:1.25em;font-size:.8em;position:relative;bottom:.125em}
|
||
|
|
ul.checklist>li>p:first-child>input[type=checkbox]:first-child{margin-right:.25em}
|
||
|
|
ul.inline{display:flex;flex-flow:row wrap;list-style:none;margin:0 0 .625em -1.25em}
|
||
|
|
ul.inline>li{margin-left:1.25em}
|
||
|
|
.unstyled dl dt{font-weight:400;font-style:normal}
|
||
|
|
ol.arabic{list-style-type:decimal}
|
||
|
|
ol.decimal{list-style-type:decimal-leading-zero}
|
||
|
|
ol.loweralpha{list-style-type:lower-alpha}
|
||
|
|
ol.upperalpha{list-style-type:upper-alpha}
|
||
|
|
ol.lowerroman{list-style-type:lower-roman}
|
||
|
|
ol.upperroman{list-style-type:upper-roman}
|
||
|
|
ol.lowergreek{list-style-type:lower-greek}
|
||
|
|
.hdlist>table,.colist>table{border:0;background:none}
|
||
|
|
.hdlist>table>tbody>tr,.colist>table>tbody>tr{background:none}
|
||
|
|
td.hdlist1,td.hdlist2{vertical-align:top;padding:0 .625em}
|
||
|
|
td.hdlist1{font-weight:bold;padding-bottom:1.25em}
|
||
|
|
td.hdlist2{word-wrap:anywhere}
|
||
|
|
.literalblock+.colist,.listingblock+.colist{margin-top:-.5em}
|
||
|
|
.colist td:not([class]):first-child{padding:.4em .75em 0;line-height:1;vertical-align:top}
|
||
|
|
.colist td:not([class]):first-child img{max-width:none}
|
||
|
|
.colist td:not([class]):last-child{padding:.25em 0}
|
||
|
|
.thumb,.th{line-height:0;display:inline-block;border:4px solid #fff;box-shadow:0 0 0 1px #ddd}
|
||
|
|
.imageblock.left{margin:.25em .625em 1.25em 0}
|
||
|
|
.imageblock.right{margin:.25em 0 1.25em .625em}
|
||
|
|
.imageblock>.title{margin-bottom:0}
|
||
|
|
.imageblock.thumb,.imageblock.th{border-width:6px}
|
||
|
|
.imageblock.thumb>.title,.imageblock.th>.title{padding:0 .125em}
|
||
|
|
.image.left,.image.right{margin-top:.25em;margin-bottom:.25em;display:inline-block;line-height:0}
|
||
|
|
.image.left{margin-right:.625em}
|
||
|
|
.image.right{margin-left:.625em}
|
||
|
|
a.image{text-decoration:none;display:inline-block}
|
||
|
|
a.image object{pointer-events:none}
|
||
|
|
sup.footnote,sup.footnoteref{font-size:.875em;position:static;vertical-align:super}
|
||
|
|
sup.footnote a,sup.footnoteref a{text-decoration:none}
|
||
|
|
sup.footnote a:active,sup.footnoteref a:active{text-decoration:underline}
|
||
|
|
#footnotes{padding-top:.75em;padding-bottom:.75em;margin-bottom:.625em}
|
||
|
|
#footnotes hr{width:20%;min-width:6.25em;margin:-.25em 0 .75em;border-width:1px 0 0}
|
||
|
|
#footnotes .footnote{padding:0 .375em 0 .225em;line-height:1.3334;font-size:.875em;margin-left:1.2em;margin-bottom:.2em}
|
||
|
|
#footnotes .footnote a:first-of-type{font-weight:bold;text-decoration:none;margin-left:-1.05em}
|
||
|
|
#footnotes .footnote:last-of-type{margin-bottom:0}
|
||
|
|
#content #footnotes{margin-top:-.625em;margin-bottom:0;padding:.75em 0}
|
||
|
|
div.unbreakable{page-break-inside:avoid}
|
||
|
|
.big{font-size:larger}
|
||
|
|
.small{font-size:smaller}
|
||
|
|
.underline{text-decoration:underline}
|
||
|
|
.overline{text-decoration:overline}
|
||
|
|
.line-through{text-decoration:line-through}
|
||
|
|
.aqua{color:#00bfbf}
|
||
|
|
.aqua-background{background:#00fafa}
|
||
|
|
.black{color:#000}
|
||
|
|
.black-background{background:#000}
|
||
|
|
.blue{color:#0000bf}
|
||
|
|
.blue-background{background:#0000fa}
|
||
|
|
.fuchsia{color:#bf00bf}
|
||
|
|
.fuchsia-background{background:#fa00fa}
|
||
|
|
.gray{color:#606060}
|
||
|
|
.gray-background{background:#7d7d7d}
|
||
|
|
.green{color:#006000}
|
||
|
|
.green-background{background:#007d00}
|
||
|
|
.lime{color:#00bf00}
|
||
|
|
.lime-background{background:#00fa00}
|
||
|
|
.maroon{color:#600000}
|
||
|
|
.maroon-background{background:#7d0000}
|
||
|
|
.navy{color:#000060}
|
||
|
|
.navy-background{background:#00007d}
|
||
|
|
.olive{color:#606000}
|
||
|
|
.olive-background{background:#7d7d00}
|
||
|
|
.purple{color:#600060}
|
||
|
|
.purple-background{background:#7d007d}
|
||
|
|
.red{color:#bf0000}
|
||
|
|
.red-background{background:#fa0000}
|
||
|
|
.silver{color:#909090}
|
||
|
|
.silver-background{background:#bcbcbc}
|
||
|
|
.teal{color:#006060}
|
||
|
|
.teal-background{background:#007d7d}
|
||
|
|
.white{color:#bfbfbf}
|
||
|
|
.white-background{background:#fafafa}
|
||
|
|
.yellow{color:#bfbf00}
|
||
|
|
.yellow-background{background:#fafa00}
|
||
|
|
span.icon>.fa{cursor:default}
|
||
|
|
a span.icon>.fa{cursor:inherit}
|
||
|
|
.admonitionblock td.icon [class^="fa icon-"]{font-size:2.5em;text-shadow:1px 1px 2px rgba(0,0,0,.5);cursor:default}
|
||
|
|
.admonitionblock td.icon .icon-note::before{content:"\f05a";color:#19407c}
|
||
|
|
.admonitionblock td.icon .icon-tip::before{content:"\f0eb";text-shadow:1px 1px 2px rgba(155,155,0,.8);color:#111}
|
||
|
|
.admonitionblock td.icon .icon-warning::before{content:"\f071";color:#bf6900}
|
||
|
|
.admonitionblock td.icon .icon-caution::before{content:"\f06d";color:#bf3400}
|
||
|
|
.admonitionblock td.icon .icon-important::before{content:"\f06a";color:#bf0000}
|
||
|
|
.conum[data-value]{display:inline-block;color:#fff!important;background:rgba(0,0,0,.8);border-radius:50%;text-align:center;font-size:.75em;width:1.67em;height:1.67em;line-height:1.67em;font-family:"Open Sans","DejaVu Sans",sans-serif;font-style:normal;font-weight:bold}
|
||
|
|
.conum[data-value] *{color:#fff!important}
|
||
|
|
.conum[data-value]+b{display:none}
|
||
|
|
.conum[data-value]::after{content:attr(data-value)}
|
||
|
|
pre .conum[data-value]{position:relative;top:-.125em}
|
||
|
|
b.conum *{color:inherit!important}
|
||
|
|
.conum:not([data-value]):empty{display:none}
|
||
|
|
dt,th.tableblock,td.content,div.footnote{text-rendering:optimizeLegibility}
|
||
|
|
h1,h2,p,td.content,span.alt,summary{letter-spacing:-.01em}
|
||
|
|
p strong,td.content strong,div.footnote strong{letter-spacing:-.005em}
|
||
|
|
p,blockquote,dt,td.content,span.alt,summary{font-size:1.0625rem}
|
||
|
|
p{margin-bottom:1.25rem}
|
||
|
|
.sidebarblock p,.sidebarblock dt,.sidebarblock td.content,p.tableblock{font-size:1em}
|
||
|
|
.exampleblock>.content{background:#fffef7;border-color:#e0e0dc;box-shadow:0 1px 4px #e0e0dc}
|
||
|
|
.print-only{display:none!important}
|
||
|
|
@page{margin:1.25cm .75cm}
|
||
|
|
@media print{*{box-shadow:none!important;text-shadow:none!important}
|
||
|
|
html{font-size:80%}
|
||
|
|
a{color:inherit!important;text-decoration:underline!important}
|
||
|
|
a.bare,a[href^="#"],a[href^="mailto:"]{text-decoration:none!important}
|
||
|
|
a[href^="http:"]:not(.bare)::after,a[href^="https:"]:not(.bare)::after{content:"(" attr(href) ")";display:inline-block;font-size:.875em;padding-left:.25em}
|
||
|
|
abbr[title]{border-bottom:1px dotted}
|
||
|
|
abbr[title]::after{content:" (" attr(title) ")"}
|
||
|
|
pre,blockquote,tr,img,object,svg{page-break-inside:avoid}
|
||
|
|
thead{display:table-header-group}
|
||
|
|
svg{max-width:100%}
|
||
|
|
p,blockquote,dt,td.content{font-size:1em;orphans:3;widows:3}
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|
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|
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</style>
|
||
|
|
</head>
|
||
|
|
<body class="book toc2 toc-left">
|
||
|
|
<div id="header">
|
||
|
|
<h1>OpenSSH Key Structure Guide</h1>
|
||
|
|
<div class="details">
|
||
|
|
<span id="author" class="author">brent saner <bts@square-r00t.net>, https://r00t2.io</span><br>
|
||
|
|
<span id="revdate">Last updated 2022-03-06 04:09:26 -0500</span>
|
||
|
|
</div>
|
||
|
|
<div id="toc" class="toc2">
|
||
|
|
<div id="toctitle">Table of Contents</div>
|
||
|
|
<ul class="sectlevel1">
|
||
|
|
<li><a href="#purpose">1. Purpose</a></li>
|
||
|
|
<li><a href="#basic_introduction">2. Basic Introduction</a>
|
||
|
|
<ul class="sectlevel2">
|
||
|
|
<li><a href="#legacy">2.1. Legacy</a>
|
||
|
|
<ul class="sectlevel3">
|
||
|
|
<li><a href="#private_keys">2.1.1. Private Keys</a></li>
|
||
|
|
<li><a href="#public_keys">2.1.2. Public Keys</a></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
<li><a href="#new_v1_format">2.2. New "v1" Format</a>
|
||
|
|
<ul class="sectlevel3">
|
||
|
|
<li><a href="#private_keys_2">2.2.1. Private Keys</a></li>
|
||
|
|
<li><a href="#public_keys_2">2.2.2. Public Keys</a></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
<li><a href="#keytype_specific_breakdowns">3. Keytype-Specific Breakdowns</a>
|
||
|
|
<ul class="sectlevel2">
|
||
|
|
<li><a href="#rsa">3.1. RSA</a>
|
||
|
|
<ul class="sectlevel3">
|
||
|
|
<li><a href="#public">3.1.1. Public</a>
|
||
|
|
<ul class="sectlevel4">
|
||
|
|
<li><a href="#structure">3.1.1.1. Structure</a></li>
|
||
|
|
<li><a href="#example">3.1.1.2. Example</a></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
<li><a href="#private">3.1.2. Private</a>
|
||
|
|
<ul class="sectlevel4">
|
||
|
|
<li><a href="#legacy_2">3.1.2.1. Legacy</a></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
<li><a href="#ed25519">3.2. ED25519</a></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div id="content">
|
||
|
|
<div class="sect1">
|
||
|
|
<h2 id="purpose"><a class="link" href="#purpose">1. Purpose</a></h2>
|
||
|
|
<div class="sectionbody">
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>This document attempts to present a much more detailed, thorough, and easily-understood form of the key formats used by OpenSSH. The extent of those formats' canonical documentation is <a href="https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key" target="_blank" rel="noopener">the OpenSSH source tree’s <code>PROTOCOL.key</code></a>, which is a little lacking.</p>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="sect1">
|
||
|
|
<h2 id="basic_introduction"><a class="link" href="#basic_introduction">2. Basic Introduction</a></h2>
|
||
|
|
<div class="sectionbody">
|
||
|
|
<div class="sect2">
|
||
|
|
<h3 id="legacy"><a class="link" href="#legacy">2.1. Legacy</a></h3>
|
||
|
|
<div class="sect3">
|
||
|
|
<h4 id="private_keys"><a class="link" href="#private_keys">2.1.1. Private Keys</a></h4>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>In OpenSSH pre-7.8, private keys are stored in their respective PEM encoding<sup class="footnote">[<a id="_footnoteref_1" class="footnote" href="#_footnotedef_1" title="View footnote.">1</a>]</sup> with no modification. These legacy private keys should be entirely usable by OpenSSL/LibreSSL/GnuTLS etc. natively with no conversion necessary.</p>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="sect3">
|
||
|
|
<h4 id="public_keys"><a class="link" href="#public_keys">2.1.2. Public Keys</a></h4>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>Each public key <strong>file</strong> (<code>*.pub</code>) is written out in the following format:</p>
|
||
|
|
</div>
|
||
|
|
<div class="literalblock">
|
||
|
|
<div class="content">
|
||
|
|
<pre>A B C</pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>Where:</p>
|
||
|
|
</div>
|
||
|
|
<div class="dlist">
|
||
|
|
<dl>
|
||
|
|
<dt class="hdlist1">A</dt>
|
||
|
|
<dd>
|
||
|
|
<p>The key type (e.g. <code>ssh-rsa</code>, <code>ssh-ed25519</code>, etc.)</p>
|
||
|
|
</dd>
|
||
|
|
<dt class="hdlist1">B</dt>
|
||
|
|
<dd>
|
||
|
|
<p>The public key itself, Base64<sup class="footnote">[<a id="_footnoteref_2" class="footnote" href="#_footnotedef_2" title="View footnote.">2</a>]</sup>-encoded</p>
|
||
|
|
</dd>
|
||
|
|
<dt class="hdlist1">C</dt>
|
||
|
|
<dd>
|
||
|
|
<p>The key’s comment</p>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
</div>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>The structures specified in the breakdowns later in this document describe the <em>decoded</em> version of <strong>B</strong> <strong><em>only</em></strong>.</p>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="sect2">
|
||
|
|
<h3 id="new_v1_format"><a class="link" href="#new_v1_format">2.2. New "v1" Format</a></h3>
|
||
|
|
<div class="sect3">
|
||
|
|
<h4 id="private_keys_2"><a class="link" href="#private_keys_2">2.2.1. Private Keys</a></h4>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
<div class="sect3">
|
||
|
|
<h4 id="public_keys_2"><a class="link" href="#public_keys_2">2.2.2. Public Keys</a></h4>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="sect1">
|
||
|
|
<h2 id="keytype_specific_breakdowns"><a class="link" href="#keytype_specific_breakdowns">3. Keytype-Specific Breakdowns</a></h2>
|
||
|
|
<div class="sectionbody">
|
||
|
|
<div class="sect2">
|
||
|
|
<h3 id="rsa"><a class="link" href="#rsa">3.1. RSA</a></h3>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>RSA<sup class="footnote">[<a id="_footnoteref_3" class="footnote" href="#_footnotedef_3" title="View footnote.">3</a>]</sup> is a widely-supported PKI system. It is ubiquitous, but it is recommended to use newer systems (e.g. ED25519) for OpenSSH if all clients and destinations support it.</p>
|
||
|
|
</div>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>The key structures have references to the RSA notations in single quotes. You can find these enumerated in <a href="https://datatracker.ietf.org/doc/html/rfc8017#section-2">RFC 8017 § 2</a>. See also the <a href="https://en.wikipedia.org/wiki/RSA_(cryptosystem)#Key_generation" target="_blank" rel="noopener">Wikipedia article</a>.</p>
|
||
|
|
</div>
|
||
|
|
<div class="sect3">
|
||
|
|
<h4 id="public"><a class="link" href="#public">3.1.1. Public</a></h4>
|
||
|
|
<div class="sect4">
|
||
|
|
<h5 id="structure"><a class="link" href="#structure">3.1.1.1. Structure</a></h5>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>Public keys are stored in the following structure:</p>
|
||
|
|
</div>
|
||
|
|
<div class="listingblock">
|
||
|
|
<div class="title">Key Structure</div>
|
||
|
|
<div class="content">
|
||
|
|
<pre class="rouge highlight"><code data-lang="text"><table class="linenotable"><tbody><tr><td class="linenos gl"><pre class="lineno">1
|
||
|
|
2
|
||
|
|
3
|
||
|
|
4
|
||
|
|
5
|
||
|
|
6
|
||
|
|
</pre></td><td class="code"><pre>0 uint32 allocator for 0.0 (4 bytes)
|
||
|
|
0.0 Public key type string (ASCII bytes; length defined above)
|
||
|
|
1 uint32 allocator for 1.0 (4 bytes)
|
||
|
|
1.0 Public exponent ('e')
|
||
|
|
2 uint32 allocator for 2.0 (4 bytes)
|
||
|
|
2.0 modulus ('n')
|
||
|
|
</pre></td></tr></tbody></table></code></pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="sect4">
|
||
|
|
<h5 id="example"><a class="link" href="#example">3.1.1.2. Example</a></h5>
|
||
|
|
<div class="listingblock">
|
||
|
|
<div class="title"><code>.pub</code> format</div>
|
||
|
|
<div class="content">
|
||
|
|
<pre class="rouge highlight"><code data-lang="text"><table class="linenotable"><tbody><tr><td class="linenos gl"><pre class="lineno">1
|
||
|
|
</pre></td><td class="code"><pre>ssh-rsa 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 This is a comment string
|
||
|
|
</pre></td></tr></tbody></table></code></pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="listingblock">
|
||
|
|
<div class="title">Structure Reference (Hex) (Decoded Base64 component only; <code>AAA…​PBw==</code>)</div>
|
||
|
|
<div class="content">
|
||
|
|
<pre class="rouge highlight"><code data-lang="text"><table class="linenotable"><tbody><tr><td class="linenos gl"><pre class="lineno"> 1
|
||
|
|
2
|
||
|
|
3
|
||
|
|
4
|
||
|
|
5
|
||
|
|
6
|
||
|
|
7
|
||
|
|
8
|
||
|
|
9
|
||
|
|
10
|
||
|
|
11
|
||
|
|
12
|
||
|
|
13
|
||
|
|
14
|
||
|
|
15
|
||
|
|
16
|
||
|
|
17
|
||
|
|
18
|
||
|
|
19
|
||
|
|
20
|
||
|
|
21
|
||
|
|
22
|
||
|
|
</pre></td><td class="code"><pre>0 00000007 (7)
|
||
|
|
0.0 7373682d727361 ("ssh-rsa")
|
||
|
|
1 00000003 (3)
|
||
|
|
1.0 010001 (65537)
|
||
|
|
2 00000201 (513)
|
||
|
|
2.0 00b7cec04601ce2a12f0c924cb9a30eb990066812cb14369193f30b2b9fdd4af
|
||
|
|
cb300c918f2a77d64410f3617ae7c8ca318c257d3c4df4e2c4108bbbe93a8689
|
||
|
|
4ba14b3575f2f72150bc381dcbfb742c7a196866fd3184ace96761adda0fc299
|
||
|
|
2f6c866d7569919fc22d9c4bf0de405a8c76d519aa2a5329dc6825777229a5d0
|
||
|
|
b753a7825a89b95275f9c025e215343c6c88cd6690a221f8ae9ef675ee464dc7
|
||
|
|
d118da410507ea5d6b6489dd60afd8a6646492db3e279f1a78240db8abbda6c5
|
||
|
|
0714c9636650a72081e7fa5d472c1428b07eae5d15b64ea1e2a7508512fe9ab6
|
||
|
|
55f86a313486d3cca1dd8e90acc5c9fba4d6e767507fbab9f3a7f68c748142af
|
||
|
|
2a3701d31a8a9b7511958aa77187ba702ed934d385afcee42380e95e0e7e9bc0
|
||
|
|
f4d23367fc770374167b7f0926fb6fdb6d05aad1cfd191824845b014e18153bf
|
||
|
|
0d1d3c3b1fadbb25a3f1d151f9b684633d8c1690fcd8cad05aac2aeb23dbf19a
|
||
|
|
37e480a008910319c116d47bd924b39942543b88a0f6127952b2d8e1290f3029
|
||
|
|
f542aebe9c0c8e36cf3296865cd6643c8924d566ebf4971809399a1ac096fe1e
|
||
|
|
dc3b5f871bf5ef0b4d44e0ea27620d205142e0bfcf677b4db025532121a3f074
|
||
|
|
5aa4d0586331733257855a5cecbe3ac4403d04ff0cc0c58b7c04904b402125c2
|
||
|
|
bc2a63a20ebb309cc6f3e65db301a058b8dace07e71b38f3f3595433f69b198f
|
||
|
|
07
|
||
|
|
</pre></td></tr></tbody></table></code></pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="sect3">
|
||
|
|
<h4 id="private"><a class="link" href="#private">3.1.2. Private</a></h4>
|
||
|
|
<div class="sect4">
|
||
|
|
<h5 id="legacy_2"><a class="link" href="#legacy_2">3.1.2.1. Legacy</a></h5>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>TODO</p>
|
||
|
|
</div>
|
||
|
|
<div class="paragraph">
|
||
|
|
<p>TODO
|
||
|
|
===== v1</p>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="sect2">
|
||
|
|
<h3 id="ed25519"><a class="link" href="#ed25519">3.2. ED25519</a></h3>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div id="footnotes">
|
||
|
|
<hr>
|
||
|
|
<div class="footnote" id="_footnotedef_1">
|
||
|
|
<a href="#_footnoteref_1">1</a>. <a href="https://datatracker.ietf.org/doc/html/rfc7468" class="bare">https://datatracker.ietf.org/doc/html/rfc7468</a>
|
||
|
|
</div>
|
||
|
|
<div class="footnote" id="_footnotedef_2">
|
||
|
|
<a href="#_footnoteref_2">2</a>. <a href="https://datatracker.ietf.org/doc/html/rfc4648" class="bare">https://datatracker.ietf.org/doc/html/rfc4648</a>
|
||
|
|
</div>
|
||
|
|
<div class="footnote" id="_footnotedef_3">
|
||
|
|
<a href="#_footnoteref_3">3</a>. <a href="https://datatracker.ietf.org/doc/html/rfc8017" class="bare">https://datatracker.ietf.org/doc/html/rfc8017</a>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div id="footer">
|
||
|
|
<div id="footer-text">
|
||
|
|
Last updated 2022-03-06 02:56:10 -0500
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|