mirror of
https://github.com/semaphore-protocol/semaphore.git
synced 2026-04-28 03:00:41 -04:00
300 lines
15 KiB
HTML
300 lines
15 KiB
HTML
<!DOCTYPE HTML>
|
|
<html lang="en" class="sidebar-visible no-js light">
|
|
<head>
|
|
<!-- Book generated using mdBook -->
|
|
<meta charset="UTF-8">
|
|
<title>Contract API - </title>
|
|
|
|
|
|
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
|
|
<meta name="description" content="">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
|
<meta name="theme-color" content="#ffffff" />
|
|
|
|
<link rel="shortcut icon" href="favicon.png">
|
|
<link rel="stylesheet" href="css/variables.css">
|
|
<link rel="stylesheet" href="css/general.css">
|
|
<link rel="stylesheet" href="css/chrome.css">
|
|
<link rel="stylesheet" href="css/print.css" media="print">
|
|
|
|
<!-- Fonts -->
|
|
<link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
|
|
<link href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet" type="text/css">
|
|
<link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:500" rel="stylesheet" type="text/css">
|
|
|
|
<!-- Highlight.js Stylesheets -->
|
|
<link rel="stylesheet" href="highlight.css">
|
|
<link rel="stylesheet" href="tomorrow-night.css">
|
|
<link rel="stylesheet" href="ayu-highlight.css">
|
|
|
|
<!-- Custom theme stylesheets -->
|
|
|
|
|
|
|
|
</head>
|
|
<body>
|
|
<!-- Provide site root to javascript -->
|
|
<script type="text/javascript">
|
|
var path_to_root = "";
|
|
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light";
|
|
</script>
|
|
|
|
<!-- Work around some values being stored in localStorage wrapped in quotes -->
|
|
<script type="text/javascript">
|
|
try {
|
|
var theme = localStorage.getItem('mdbook-theme');
|
|
var sidebar = localStorage.getItem('mdbook-sidebar');
|
|
|
|
if (theme.startsWith('"') && theme.endsWith('"')) {
|
|
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
|
|
}
|
|
|
|
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
|
|
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
|
|
}
|
|
} catch (e) { }
|
|
</script>
|
|
|
|
<!-- Set the theme before any content is loaded, prevents flash -->
|
|
<script type="text/javascript">
|
|
var theme;
|
|
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
|
|
if (theme === null || theme === undefined) { theme = default_theme; }
|
|
var html = document.querySelector('html');
|
|
html.classList.remove('no-js')
|
|
html.classList.remove('light')
|
|
html.classList.add(theme);
|
|
html.classList.add('js');
|
|
</script>
|
|
|
|
<!-- Hide / unhide sidebar before it is displayed -->
|
|
<script type="text/javascript">
|
|
var html = document.querySelector('html');
|
|
var sidebar = 'hidden';
|
|
if (document.body.clientWidth >= 1080) {
|
|
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
|
|
sidebar = sidebar || 'visible';
|
|
}
|
|
html.classList.remove('sidebar-visible');
|
|
html.classList.add("sidebar-" + sidebar);
|
|
</script>
|
|
|
|
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
|
|
<div id="sidebar-scrollbox" class="sidebar-scrollbox">
|
|
<ol class="chapter"><li class="expanded "><a href="about.html"><strong aria-hidden="true">1.</strong> About</a></li><li class="expanded "><a href="howitworks.html"><strong aria-hidden="true">2.</strong> How it works</a></li><li class="expanded "><a href="quickstart.html"><strong aria-hidden="true">3.</strong> Quick start</a></li><li class="expanded "><a href="usage.html"><strong aria-hidden="true">4.</strong> Usage</a></li><li class="expanded "><a href="api.html" class="active"><strong aria-hidden="true">5.</strong> Contract API</a></li><li class="expanded "><a href="libsemaphore.html"><strong aria-hidden="true">6.</strong> libsemaphore</a></li><li class="expanded "><a href="trustedsetup.html"><strong aria-hidden="true">7.</strong> Trusted setup</a></li><li class="expanded "><a href="audit.html"><strong aria-hidden="true">8.</strong> Security audit</a></li><li class="expanded "><a href="creditsandresources.html"><strong aria-hidden="true">9.</strong> Credits and resources</a></li></ol>
|
|
</div>
|
|
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
|
|
</nav>
|
|
|
|
<div id="page-wrapper" class="page-wrapper">
|
|
|
|
<div class="page">
|
|
|
|
<div id="menu-bar" class="menu-bar">
|
|
<div id="menu-bar-sticky-container">
|
|
<div class="left-buttons">
|
|
<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
|
|
<i class="fa fa-bars"></i>
|
|
</button>
|
|
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
|
|
<i class="fa fa-paint-brush"></i>
|
|
</button>
|
|
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
|
|
<li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
|
|
</ul>
|
|
|
|
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
|
|
<i class="fa fa-search"></i>
|
|
</button>
|
|
|
|
</div>
|
|
|
|
<h1 class="menu-title"></h1>
|
|
|
|
<div class="right-buttons">
|
|
<a href="print.html" title="Print this book" aria-label="Print this book">
|
|
<i id="print-button" class="fa fa-print"></i>
|
|
</a>
|
|
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<div id="search-wrapper" class="hidden">
|
|
<form id="searchbar-outer" class="searchbar-outer">
|
|
<input type="search" name="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
|
|
</form>
|
|
<div id="searchresults-outer" class="searchresults-outer hidden">
|
|
<div id="searchresults-header" class="searchresults-header"></div>
|
|
<ul id="searchresults">
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
|
|
<script type="text/javascript">
|
|
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
|
|
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
|
|
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
|
|
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
|
|
});
|
|
</script>
|
|
|
|
<div id="content" class="content">
|
|
<main>
|
|
<h1><a class="header" href="#contract-api" id="contract-api">Contract API</a></h1>
|
|
<h2><a class="header" href="#constructor" id="constructor">Constructor</a></h2>
|
|
<p><strong>Contract ABI</strong>:</p>
|
|
<p><code>constructor(uint8 _treeLevels, uint232 _firstExternalNullifier)</code></p>
|
|
<ul>
|
|
<li><code>_treeLevels</code>: The depth of the identity tree.</li>
|
|
<li><code>_firstExternalNullifier</code>: The first identity nullifier to add.</li>
|
|
</ul>
|
|
<p>The depth of the identity tree determines how many identity commitments may be
|
|
added to this contract: <code>2 ^ _treeLevels</code>. Once the tree is full, further
|
|
insertions will fail with the revert reason <code>IncrementalMerkleTree: tree is full</code>.</p>
|
|
<p>The first external nullifier will be added as an external nullifier to the
|
|
contract, and this external nullifier will be active once the deployment
|
|
completes.</p>
|
|
<h2><a class="header" href="#add-deactivate-or-reactivate-external-nullifiiers" id="add-deactivate-or-reactivate-external-nullifiiers">Add, deactivate, or reactivate external nullifiiers</a></h2>
|
|
<p><strong>Contract ABI</strong>:</p>
|
|
<p><code>addExternalNullifier(uint232 _externalNullifier)</code></p>
|
|
<p>Adds an external nullifier to the contract. Only the owner can do this.
|
|
This external nullifier is active once it is added.</p>
|
|
<ul>
|
|
<li><code>_externalNullifier</code>: The new external nullifier to set.</li>
|
|
</ul>
|
|
<p><code>deactivateExternalNullifier(uint232 _externalNullifier)</code></p>
|
|
<ul>
|
|
<li><code>_externalNullifier</code>: The existing external nullifier to deactivate.</li>
|
|
</ul>
|
|
<p>Deactivate an external nullifier. The external nullifier must already be active
|
|
for this function to work. Only the owner can do this.</p>
|
|
<p><code>reactivateExternalNullifier(uint232 _externalNullifier)</code></p>
|
|
<p>Reactivate an external nullifier. The external nullifier must already be
|
|
inactive for this function to work. Only the owner can do this.</p>
|
|
<ul>
|
|
<li><code>_externalNullifier</code>: The deactivated external nullifier to reactivate.</li>
|
|
</ul>
|
|
<h2><a class="header" href="#insert-identities" id="insert-identities">Insert identities</a></h2>
|
|
<p><strong>Contract ABI</strong>:</p>
|
|
<p><code>function insertIdentity(uint256 _identityCommitment)</code></p>
|
|
<ul>
|
|
<li><code>_identity_commitment</code>: The user's identity commitment, which is the hash of
|
|
their public key and their identity nullifier (a random 31-byte value). It
|
|
should be the output of a Pedersen hash. It is the responsibility of the
|
|
caller to verify this.</li>
|
|
</ul>
|
|
<p><strong>Off-chain <code>libsemaphore</code> helper functions</strong>:</p>
|
|
<p>Use <code>genIdentity()</code> to generate an <code>Identity</code> object, and
|
|
<code>genIdentityCommitment(identity: Identity)</code> to generate the
|
|
<code>_identityCommitment</code> value to pass to the contract.</p>
|
|
<p>To convert <code>identity</code> to a string and back, so that you can store it in a
|
|
database or somewhere safe, use <code>serialiseIdentity()</code> and
|
|
<code>unSerialiseIdentity()</code>.</p>
|
|
<p>See the <a href="./usage.html#insert-identities">Usage section on inserting
|
|
identities</a> for more information.</p>
|
|
<h2><a class="header" href="#broadcast-signals" id="broadcast-signals">Broadcast signals</a></h2>
|
|
<p><strong>Contract ABI</strong>:</p>
|
|
<pre><code>broadcastSignal(
|
|
bytes memory _signal,
|
|
uint256[8] memory _proof,
|
|
uint256 _root,
|
|
uint256 _nullifiersHash,
|
|
uint232 _externalNullifier
|
|
)
|
|
</code></pre>
|
|
<ul>
|
|
<li><code>_signal</code>: the signal to broadcast.</li>
|
|
<li><code>_proof</code>: a zk-SNARK proof (see below).</li>
|
|
<li><code>_root</code>: The root of the identity tree, where the user's identity commitment
|
|
is the last-inserted leaf.</li>
|
|
<li><code>_nullifiersHash</code>: A uniquely derived hash of the external nullifier, user's
|
|
identity nullifier, and the Merkle path index to their identity commitment.
|
|
It ensures that a user cannot broadcast a signal with the same external
|
|
nullifier more than once.</li>
|
|
<li><code>_externalNullifier</code>: The external nullifier at which the signal is
|
|
broadcast.</li>
|
|
</ul>
|
|
<p><strong>Off-chain <code>libsemaphore</code> helper functions</strong>:</p>
|
|
<p>Use <code>libsemaphore</code>'s <code>genWitness()</code>, <code>genProof()</code>, <code>genPublicSignals()</code> and
|
|
finally <code>genBroadcastSignalParams()</code> to generate the parameters to the
|
|
contract's <code>broadcastSignal()</code> function.</p>
|
|
<p>See the <a href="./usage.html#broadcast-signals">Usage section on broadcasting
|
|
signals</a> for more information.</p>
|
|
|
|
</main>
|
|
|
|
<nav class="nav-wrapper" aria-label="Page navigation">
|
|
<!-- Mobile navigation buttons -->
|
|
|
|
<a rel="prev" href="usage.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
|
<i class="fa fa-angle-left"></i>
|
|
</a>
|
|
|
|
|
|
|
|
<a rel="next" href="libsemaphore.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
|
<i class="fa fa-angle-right"></i>
|
|
</a>
|
|
|
|
|
|
<div style="clear: both"></div>
|
|
</nav>
|
|
</div>
|
|
</div>
|
|
|
|
<nav class="nav-wide-wrapper" aria-label="Page navigation">
|
|
|
|
<a href="usage.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
|
<i class="fa fa-angle-left"></i>
|
|
</a>
|
|
|
|
|
|
|
|
<a href="libsemaphore.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
|
<i class="fa fa-angle-right"></i>
|
|
</a>
|
|
|
|
</nav>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<script type="text/javascript">
|
|
window.playpen_copyable = true;
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="mark.min.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="searcher.js" type="text/javascript" charset="utf-8"></script>
|
|
|
|
|
|
<script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="highlight.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="book.js" type="text/javascript" charset="utf-8"></script>
|
|
|
|
<!-- Custom JS scripts -->
|
|
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|