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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Class: Envelope</title>
<script src="scripts/prettify/prettify.js"> </script>
<script src="scripts/prettify/lang-css.js"> </script>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
</head>
<body>
<div id="main">
<h1 class="page-title">Class: Envelope</h1>
<section>
<header>
<h2><span class="attribs"><span class="type-signature"></span></span>Envelope<span class="signature">(params)</span><span class="type-signature"></span></h2>
<div class="class-description"><p>Envelope class</p>
<p>A Univrse Envelope is a structure containing a set of headers, a payload,
and optionally one or more Signatures and Recipients.</p>
<p>An Envelope can be converted to a compact CBOR encoded buffer, a Base64
encoded string, or a Bitcoin OP_RETURN Script. This allows envelopes to be
easily and efficiently transferred between different parties, who in turn can
decode the wrapped payload.</p></div>
</header>
<article>
<div class="container-overview">
<h2>Constructor</h2>
<h4 class="name" id="Envelope"><span class="type-signature"></span>new Envelope<span class="signature">(params)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Instantiates a new Envelope instance with the given params.</p>
<p>Accepted params</p>
<ul>
<li><code>headers</code> - headers object</li>
<li><code>payload</code> - data payload</li>
<li><code>signature</code> - singature instance or array of signatures</li>
<li><code>recipient</code> - recipient instance or array of recipients</li>
</ul>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>params</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="envelope.js.html">envelope.js</a>, <a href="envelope.js.html#line23">line 23</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Classes</h3>
<dl>
<dt><a href="Envelope.fromArray.html">fromArray</a></dt>
<dd></dd>
<dt><a href="Envelope.fromBuffer.html">fromBuffer</a></dt>
<dd></dd>
<dt><a href="Envelope.fromScript.html">fromScript</a></dt>
<dd></dd>
<dt><a href="Envelope.fromString.html">fromString</a></dt>
<dd></dd>
<dt><a href="Envelope.wrap.html">wrap</a></dt>
<dd></dd>
</dl>
<h3 class="subsection-title">Members</h3>
<h4 class="name" id="encodedPayload"><span class="type-signature"></span>encodedPayload<span class="type-signature"> :Buffer</span></h4>
<div class="description">
<p>CBOR encoded payload</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Buffer</span>
</li>
</ul>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="envelope.js.html">envelope.js</a>, <a href="envelope.js.html#line123">line 123</a>
</li></ul></dd>
</dl>
<h4 class="name" id="encodedPayload"><span class="type-signature"></span>encodedPayload<span class="type-signature"> :Buffer</span></h4>
<div class="description">
<p>Sets the payload by decoding the given encoded payload.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Buffer</span>
</li>
</ul>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="envelope.js.html">envelope.js</a>, <a href="envelope.js.html#line132">line 132</a>
</li></ul></dd>
</dl>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="decrypt"><span class="type-signature">(async) </span>decrypt<span class="signature">(key, opts)</span><span class="type-signature"> → {<a href="Envelope.html">Envelope</a>}</span></h4>
<div class="description">
<p>Decrypts the payload using the given key.</p>
<p>If the Envelope contains multiple recipients, it is assumed the key belongs
to the first recipient. Otherwise, see <code>decryptAt()</code>.</p>
<p>An second argument of options can be given for the relevant encryption
algorithm.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>key</code></td>
<td class="type">
<span class="param-type"><a href="Key.html">Key</a></span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>opts</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="envelope.js.html">envelope.js</a>, <a href="envelope.js.html#line149">line 149</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="Envelope.html">Envelope</a></span>
</dd>
</dl>
<h4 class="name" id="decryptAt"><span class="type-signature">(async) </span>decryptAt<span class="signature">(i, key, opts)</span><span class="type-signature"> → {<a href="Envelope.html">Envelope</a>}</span></h4>
<div class="description">
<p>Decrypts the payload by first decrypting the content key at the specified
recipient index.</p>
<p>The Envelope mustcontains multiple recipients.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>i</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>recipient index</p></td>
</tr>
<tr>
<td class="name"><code>key</code></td>
<td class="type">
<span class="param-type"><a href="Key.html">Key</a></span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>opts</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="envelope.js.html">envelope.js</a>, <a href="envelope.js.html#line179">line 179</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="Envelope.html">Envelope</a></span>
</dd>
</dl>
<h4 class="name" id="encrypt"><span class="type-signature">(async) </span>encrypt<span class="signature">(key, headers, opts)</span><span class="type-signature"> → {<a href="Envelope.html">Envelope</a>}</span></h4>
<div class="description">
<p>Encrypts the payload using the given key or array of keys.</p>
<p>A headers object must be given including at least the encryption <code>alg</code>
value.</p>
<p>A third argument of options can be given for the relevant encryption
algorithm.</p>
<p>Where an array of keys is given, the first key is taken as the content key
and used to encrypt the payload. The content key is then encrypted by each
subsequent key and included in the Recipient instances that are attached to
the envelope.</p>
<p>When encrypting to multiple recipients, it is possible to specify different
algorithms for each key by giving an array of two element arrays. The first
element of each pair is the key and the second is a headers object.</p>
<h2>Examples</h2>
<p>Encrypts for a single recipient:</p>
<p>envelope.encrypt(aesKey, { alg: 'A128GCM' })</p>
<p>Encrypts for a multiple recipients using the same algorithm:</p>
<p>envelope.encrypt([aesKey, recKey], { alg: 'A128GCM' })</p>
<p>Encrypts for a multiple recipients using different algorithms:</p>
<p>envelope.encrypt([
aesKey,
[rec1Key, { alg: 'ECDH-ES+A128GCM' }],
[rec2Key, { alg: 'ECDH-ES+A128GCM' }],
], { alg: 'A128GCM' })</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>key</code></td>
<td class="type">
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>headers</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>opts</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="envelope.js.html">envelope.js</a>, <a href="envelope.js.html#line229">line 229</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="Envelope.html">Envelope</a></span>
</dd>
</dl>
<h4 class="name" id="pushRecipient"><span class="type-signature"></span>pushRecipient<span class="signature">(recipient)</span><span class="type-signature"> → {<a href="Envelope.html">Envelope</a>}</span></h4>
<div class="description">
<p>Attaches the given Recipient instance onto the Envelope.</p>
</div>