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draft-carpenter-anima-grasp-ext-sign.html
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<title>GRASP Flood Signing Extension</title>
<meta content="Carsten Bormann" name="author">
<meta content="Brian E. Carpenter" name="author">
<meta content="Toerless Eckert" name="author">
<meta content="Michael Richardson" name="author">
<meta content="
This document clarifies how message formats for the GeneRic Autonomic Signaling Protocol (GRASP) defined by RFC 8990 may be updated by adding new options. It also describes one such option for cryptographically signing an M_FLOOD message, and a method of adding a signature to any GRASP objective.
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}
/* font-family isn't space-separated, but =~ will have to do */
svg[font-family~="monospace" i], svg [font-family~="monospace" i] {
font-family: var(--font-mono);
}
.alignCenter.art-text {
background-color: var(--highlight-color);
border: 1px solid var(--line-color);
border-radius: 3px;
padding: 0.5em 1em 0;
margin-bottom: 0.5em;
}
.alignCenter.art-text pre {
padding: 0;
width: auto;
}
.alignCenter {
margin: 1em 0;
}
.alignCenter > *:first-child {
border: none;
/* this isn't optimal, but it's an existence proof. PrinceXML doesn't
support flexbox yet.
*/
display: table;
margin: 0 auto;
}
/* lists */
ol, ul {
padding: 0;
margin: 0 0 0.5em 2em;
}
:is(ol, ul) :is(ol, ul) {
margin-left: 1em;
}
li {
margin: 0 0 0.25em 0;
}
.ulCompact li {
margin: 0;
}
ul.empty, .ulEmpty {
list-style-type: none;
}
ul.empty li, .ulEmpty li {
margin-top: 0.5em;
}
:is(ul, ol).compact, .ulCompact, .olCompact {
line-height: 100%;
margin: 0 0 0 2em;
}
/* definition lists */
dl {
clear: left;
--indent: 3ch;
/* --indent: attr(indent ch); not supported in any browser, but we can dream */
}
dl > dt {
float: left;
margin-right: 1em;
min-width: 20ch;
}
dl.dlNewline > dt {
float: none;
}
dl > dd {
margin-bottom: .8em;
margin-left: var(--indent) !important; /* stupid element overrides */
min-height: 2ex;
}
:is(dl.compact, .dlCompact) > dd {
margin-bottom: 0;
}
:is(dl.compact, .dlCompact) > dd > :is(:first-child, .break:first-child + *) {
margin-top: 0;
}
:is(dl.compact, .dlCompact) > dd > :is(:last-child) {
margin-bottom: 0;
}
dl > dd > dl {
margin-top: 0.5em;
margin-bottom: 0;
}
dl .break {
display: none;
}
/* links */
a, a[href].selfRef:hover {
text-decoration: none;
}
a[href].selfRef {
color: var(--text-color);
}
a[href] {
color: var(--link-color);
}
a[href]:hover {
text-decoration: underline;
}
a[href].selfRef:hover {
background-color: var(--highlight-color);
}
a.xref {
white-space: nowrap;
}
/* Figures */
tt, code, pre {
background-color: var(--highlight-color);
font: 14px/22px var(--font-mono);
}
tt, code {
/* changing the font for inline elements leads to different ascender
and descender heights; as we want to retain baseline alignment,
remove leading to avoid altering the final height of lines */
line-height: 0;
}
:is(h1, h2, h3, h4, h5, h6) :is(tt, code) {
font-size: 84%;
}
pre {
border: 1px solid var(--line-color);
font-size: 13.5px;
line-height: 16px;
letter-spacing: -0.2px;
margin: 5px;
padding: 5px;
}
img {
max-width: 100%;
}
figure {
margin: 0.5em 0;
padding: 0;
}
figure blockquote {
margin: 0.8em 0.4em 0.4em;
}
figcaption, caption {
font-style: italic;
margin: 0.5em 1.5em;
text-align: left;
}
@media screen {
/* Auto-collapse boilerplate. */
:is(#status-of-memo, #copyright) p {
margin: -2px 0;
max-height: 0;
transition: max-height 2s ease, margin 0.5s ease 0.5s;
overflow: hidden;
}
:is(#status-of-memo, #copyright):hover p,
:is(#status-of-memo, #copyright) h2:target ~ p {
margin: 0.5em 0;
max-height: 500px;
overflow: auto;
}
pre, svg {
display: inline-block;
overflow-x: auto;
}
pre {
max-width: 100%;
width: calc(100% - 22px - 1em);
}
svg {
max-width: calc(100% - 22px - 1em);
}
figure pre {
display: block;
width: calc(100% - 25px);
}
:is(pre, svg) + .pilcrow {
display: inline-block;
vertical-align: text-bottom;
padding-bottom: 8px;
}
}
/* aside, blockquote */
aside, blockquote {
margin-left: 0;
padding: 0 2em;
font-style: italic;
}
blockquote {
margin: 1em 0;
}
cite {
display: block;
text-align: right;
font-style: italic;
}
/* tables */
table {
max-width: 100%;
margin: 0 0 1em;
border-collapse: collapse;
}
table.right {
margin-left: auto;
}
table.center {
margin-left: auto;
margin-right: auto;
}
table.left {
margin-right: auto;
}
thead, tbody {
border: 1px solid var(--line-color);
}
th, td {
text-align: left;
vertical-align: top;
padding: 5px 10px;
}
th {
background-color: var(--line-color);
}
:is(tr:nth-child(2n), thead+tbody > tr:nth-child(2n+1)) > td {
background-color: var(--background-color);
}
:is(tr:nth-child(2n+1), thead+tbody > tr:nth-child(2n)) > td {
background-color: var(--highlight-color);
}
table caption {
margin: 0;
padding: 3px 0 3px 1em;
}
table p {
margin: 0;
}
/* pilcrow */
a.pilcrow {
margin-left: 3px;
opacity: 0.2;
user-select: none;
}
a.pilcrow[href] { color: var(--pilcrow-weak); }
a.pilcrow[href]:hover { text-decoration: none; }
@media not print {
:hover > a.pilcrow {
opacity: 1;
}
a.pilcrow[href]:hover {
color: var(--pilcrow-strong);
background-color: transparent;
}
}
@media print {
a.pilcrow {
display: none;
}
}
/* misc */
hr {
border: 0;
border-top: 1px solid var(--line-color);
}
.bcp14 {
font-variant: small-caps;
font-weight: 600;
font-size: 14.5px;
}
.role {
font-variant: all-small-caps;
}
/* info block */
#identifiers {
margin: 0;
font-size: var(--small-font-size);
line-height: 18px;
--identifier-width: 15ch;
}
#identifiers dt {
width: var(--identifier-width);
min-width: var(--identifier-width);
clear: left;
float: left;
text-align: right;
}
#identifiers dd {
margin: 0;
margin-left: calc(1em + var(--identifier-width)) !important;
min-width: 5em;
}
#identifiers .authors .author {
display: inline-block;
margin-right: 1.5em;
}
#identifiers .authors .org {
font-style: italic;
}
/* The prepared/rendered info at the very bottom of the page */
.docInfo {
color: #999;
font-size: 0.9em;
font-style: italic;
margin-top: 2em;
}
.docInfo .prepared {
float: left;
}
.docInfo .prepared {
float: right;
}
/* table of contents */
#toc {
padding: 0.75em 0 2em 0;
margin-bottom: 1em;
}
#toc nav ul {
margin: 0 0.5em 0 0;
padding: 0;
list-style: none;
}
#toc nav li {
line-height: 1.3em;
margin: 0.75em 0;
padding-left: 1.2em;
text-indent: -1.2em;
}
#toc a.xref {
white-space: normal;
}
/* references */
.references dt {
text-align: right;
font-weight: bold;
min-width: 7em;
}
.references dt:target::before {
content: "⇒";
width: 15px;
margin: 0 10px 0 -25px;
}
.references dd {
margin-left: 8em !important;
overflow: auto;
}
.refInstance {
margin-bottom: 1.25em;
}
.references .ascii {
margin-bottom: 0.25em;
}
/* index */
#rfc\.index\.index + ul {
margin-left: 0;
}
/* authors */
address.vcard {
font-style: normal;
margin: 1em 0;
}
address.vcard .nameRole {
font-weight: 700;
margin-left: 0;
}
address.vcard .label {
margin: 0.5em 0;
}
address.vcard .type {
display: none;
}
.alternative-contact {
margin: 1.5em 0 1em;
}
hr.addr {
border-top: 1px dashed;
margin: 0;
color: #ddd;
max-width: calc(100% - 16px);
}
@media (min-width: 500px) {
#authors-addresses > section {
column-count: 2;
column-gap: 20px;
}
#authors-addresses > section > h2 {
column-span: all;
}
/* hack for break-inside: avoid-column */
#authors-addresses address {
display: inline-block;
break-inside: avoid-column;
}
}
.rfcEditorRemove p:first-of-type {
font-style: italic;
}
.cref {
background-color: rgba(249, 232, 105, 0.3);
padding: 2px 4px;
}
.crefSource {
font-style: italic;
}
/* alternative layout for smaller screens */
@media screen and (max-width: 929px) {
#toc {
position: fixed;
z-index: 2;
top: 0;
right: 0;
padding: 0;
margin: 0;
border-bottom: 1px solid #ccc;
opacity: 0.6;
}
#toc.active {
opacity: 1;
}
#toc h2 {
margin: 0;
padding: 2px 0 2px 6px;
padding-right: 1em;
font-size: 18px;
line-height: 24px;
min-width: 190px;
text-align: right;
background-color: #444;
color: white;
cursor: pointer;
}
#toc h2::before { /* css hamburger */
float: right;
position: relative;
width: 1em;
height: 1px;
left: -164px;
margin: 8px 0 0 0;
background: white none repeat scroll 0 0;
box-shadow: 0 4px 0 0 white, 0 8px 0 0 white;
content: "";
}
#toc nav {
display: none;
background-color: var(--background-color);
padding: 0.5em 1em 1em;
overflow: auto;
overscroll-behavior: contain;
height: calc(100vh - 48px);
border-left: 1px solid #ddd;
}
#toc.active nav {
display: block;
}
/* Make the collapsed ToC header render white on gray also when it's a link */
#toc h2 a,
#toc h2 a:link,
#toc h2 a:focus,
#toc h2 a:hover,
#toc a.toplink,
#toc a.toplink:hover {
color: white;
background-color: #444;
text-decoration: none;
}
#toc a.toplink {
margin-top: 2px;
}
}
/* alternative layout for wide screens */
@media screen and (min-width: 930px) {
body {
padding-right: 360px;
padding-right: calc(min(180px + 20%, 500px));
}
#toc {
position: fixed;
bottom: 0;
right: 0;
right: calc(50vw - 480px);
width: 312px;
margin: 0;
padding: 0;
z-index: 1;
}
#toc h2 {
margin: 0;
padding: 0.25em 1em 1em 0;
}
#toc nav {
display: block;
height: calc(90vh - 84px);
bottom: 0;
padding: 0.5em 0 2em;
overflow: auto;
overscroll-behavior: contain;
scrollbar-width: thin;
}
#toc nav > ul {
margin-bottom: 2em;
}
#toc ul {
margin: 0 0 0 4px;
font-size: var(--small-font-size);
}
#toc ul :is(p, li) {
margin: 2px 0;
line-height: 22px;
}
img { /* future proofing */
max-width: 100%;
height: auto;
}
}
/* pagination */
@media print {
body {
width: 100%;
}
p {
orphans: 3;
widows: 3;
}
#n-copyright-notice {
border-bottom: none;
}
#toc, #n-introduction {
page-break-before: always;
}
#toc {
border-top: none;
padding-top: 0;
}
figure, pre {
page-break-inside: avoid;
}
figure {
overflow: scroll;
}
h1, h2, h3, h4, h5, h6 {
page-break-after: avoid;
}
h2+*, h3+*, h4+*, h5+*, h6+* {
page-break-before: avoid;
}
pre {
white-space: pre-wrap;
word-wrap: break-word;
font-size: 10pt;
}
table {
border: 1px solid #ddd;
}
td {
border-top: 1px solid #ddd;
}
}
@page :first {
padding-top: 0;
@top-left {
content: normal;
border: none;
}
@top-center {
content: normal;
border: none;
}
@top-right {
content: normal;
border: none;
}
}
@page {
size: A4;
margin-bottom: 45mm;
padding-top: 20px;
}
/* Changes introduced to fix issues found during implementation */
/* Separate body from document info even without intervening H1 */
section {
clear: both;
}
/* Top align author divs, to avoid names without organization dropping level with org names */
.author {
vertical-align: top;
}
/* Style section numbers with more space between number and title */
.section-number {
padding-right: 0.5em;
}
/* Add styling for a link in the ToC that points to the top of the document */
a.toplink {
float: right;
margin: 8px 0.5em 0;
}
/* Provide styling for table cell text alignment */
table .text-left {
text-align: left;
}
table .text-center {
text-align: center;
}
table .text-right {
text-align: right;
}
/* Make the alternative author contact information look less like just another
author, and group it closer with the primary author contact information */
.alternative-contact {
margin: 0.5em 0 0.25em 0;
}
address .non-ascii {
margin: 0 0 0 2em;
}
/* With it being possible to set tables with alignment
left, center, and right, { width: 100%; } does not make sense */
table {
width: auto;
}
/* Avoid reference text that sits in a block with very wide left margin,
because of a long floating dt label.*/
.references dd {
overflow: visible;
}
/* Control caption placement */
caption {
caption-side: bottom;
}
/* Limit the width of the author address vcard, so names in right-to-left
script don't end up on the other side of the page. */
address.vcard {
max-width: 20em;
margin-right: auto;
}
/* For address alignment dependent on LTR or RTL scripts */
address div.left {
text-align: left;
}
address div.right {
text-align: right;
}
/* Give the table caption label the same styling as the figcaption */
@media print {
.toplink {
display: none;
}
/* avoid overwriting the top border line with the ToC header */
#toc {
padding-top: 1px;
}
/* Avoid page breaks inside dl and author address entries */
dd {
page-break-before: avoid;
}
.vcard {
page-break-inside: avoid;