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MAJ 28/11/2024
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<article itemscope itemtype="http://schema.org/Article"><div class="article__header"><header><h1 style="color:Tomato;">JsonWebToken(jwt)</h1></header></div><meta itemprop="headline" content="JsonWebToken(jwt)"><div class="article__info clearfix"><ul class="left-col menu"><li>
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<i class="far fa-calendar-alt"></i>&nbsp;<span title="Création" style="color:#FF00FF">25&nbsp;déc.&nbsp;&nbsp;2019</span>
<span title="Modification" style="color:#00FF7F">26&nbsp;sept.&nbsp;2019</span></li></ul></div><meta itemprop="datePublished" content="2019-09-26T00:00:00+02:00">
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</details><h1 id="jwt-on-php">JWT on PHP</h1>
<ul>
<li>https://medium.com/@crmcmullen/simple-example-using-json-web-tokens-with-php-and-jquery-c648a80854c</li>
<li>https://github.com/crmcmullen/jwtphpjquery/blob/master/index.html</li>
<li>https://medium.com/tag/json-web-token</li>
<li><a href="https://website.simplx.fr/blog/2016/09/27/authentification-api-via-jwt-et-cookies/">Authentification d’API via JWT et les Cookies</a></li>
<li><a href="https://www.ekino.com/articles/securite-avec-jwt-premiere-partie">En toute sécurité avec JWT (1re partie)</a></li>
<li><a href="https://www.ekino.fr/articles/securite-avec-jwt-seconde-partie">En toute sécurité avec JWT (2de partie)</a></li>
<li><a href="https://www.pierre-giraud.com/php-mysql-apprendre-coder-cours/cookie-creation-gestion/">Création et gestion des cookies en PHP</a></li>
<li><a href="https://blog.zend.com/2018/11/06/modern-cryptography-in-php-7-2-with-sodium/">Modern cryptography in PHP 7.2 with Sodium</a></li>
<li>
<p><a href="https://openclassrooms.com/fr/courses/2091901-protegez-vous-efficacement-contre-les-failles-web/2863569-la-csrf">Protégez-vous efficacement contre les failles web</a></p>
<p>index.html</p>
</li>
</ul>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta http-equiv="content-type" content="text/html; charset=utf-8" /&gt;
&lt;title&gt;JWT Example&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div&gt;
&lt;button id="test"&gt;Test if Logged In&lt;/button&gt;
&lt;button id="goodLogin"&gt;Good Login&lt;/button&gt;
&lt;button id="badLogin"&gt;Bad Login&lt;/button&gt;
&lt;button id="logout"&gt;Logout and Clear Token&lt;/button&gt;
&lt;/div&gt;
&lt;script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"&gt;&lt;/script&gt;
&lt;script type="text/javascript"&gt;
$(document).ready(function() {
$('#test').click(function() {
$.ajax({
type: 'GET',
url: 'app_client.php',
dataType: "json",
data: {
token: localStorage.token
},
success: function(data) {
if (typeof data['userId'] !== 'undefined') {
var alertMessage = 'You have a valid token! Here is your user Id: ' + data['userId'];
if (typeof data['exp'] !== 'undefined') {
alertMessage = alertMessage + ' and your token expires: ' + data['exp'];
}
alert(alertMessage);
}
else if (typeof data['error'] !== 'undefined') {
alert('Error: ' + data['error']);
}
else {
alert('Error: Your request has failed.');
}
}
});
});
$('#goodLogin').click(function() {
$.ajax({
type: "POST",
url: "app_client.php",
dataType: "json",
data: {
username: "john.doe",
password: "foobar"
},
success: function(data) {
localStorage.token = data['token'];
alert('Successfully retrieved token from the server! Token: ' + data['token']);
},
error: function() {
alert("Error: Login Failed");
}
});
});
$('#badLogin').click(function() {
$.ajax({
type: "POST",
url: "app_client.php",
dataType: "json",
data: {
username: "john.doe",
password: "foobarfoobar"
},
success: function(data) {
if (typeof data['error'] !== 'undefined') {
alert('Error: ' + data['error']);
localStorage.clear();
}
},
error: function() {
alert('Error: Your request has failed.');
}
});
});
$('#logout').click(function() {
localStorage.clear();
});
});
&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>app_client.php
</code></pre></div></div>
<div class="language-php highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">&lt;?php</span>
<span class="cd">/**
* This file processes the login request and sends back a token response
* if successful.
*/</span>
<span class="nv">$requestMethod</span> <span class="o">=</span> <span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">'REQUEST_METHOD'</span><span class="p">];</span>
<span class="c1">// retrieve the inbound parameters based on request type.</span>
<span class="k">switch</span><span class="p">(</span><span class="nv">$requestMethod</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="s1">'POST'</span><span class="o">:</span>
<span class="nv">$username</span> <span class="o">=</span> <span class="s1">''</span><span class="p">;</span>
<span class="nv">$password</span> <span class="o">=</span> <span class="s1">''</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$_POST</span><span class="p">[</span><span class="s1">'username'</span><span class="p">]))</span> <span class="p">{</span><span class="nv">$username</span> <span class="o">=</span> <span class="nv">$_POST</span><span class="p">[</span><span class="s1">'username'</span><span class="p">];}</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$_POST</span><span class="p">[</span><span class="s1">'password'</span><span class="p">]))</span> <span class="p">{</span><span class="nv">$password</span> <span class="o">=</span> <span class="nv">$_POST</span><span class="p">[</span><span class="s1">'password'</span><span class="p">];}</span>
<span class="k">if</span> <span class="p">((</span><span class="nv">$username</span> <span class="o">==</span> <span class="s1">'john.doe'</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="p">(</span><span class="nv">$password</span> <span class="o">==</span> <span class="s1">'foobar'</span><span class="p">))</span> <span class="p">{</span>
<span class="k">require_once</span><span class="p">(</span><span class="s1">'jwt.php'</span><span class="p">);</span>
<span class="cd">/**
* Create some payload data with user data we would normally retrieve from a
* database with users credentials. Then when the client sends back the token,
* this payload data is available for us to use to retrieve other data
* if necessary.
*/</span>
<span class="nv">$userId</span> <span class="o">=</span> <span class="s1">'USER123456'</span><span class="p">;</span>
<span class="cd">/**
* Uncomment the following line and add an appropriate date to enable the
* "not before" feature.
*/</span>
<span class="c1">// $nbf = strtotime('2021-01-01 00:00:01');</span>
<span class="cd">/**
* Uncomment the following line and add an appropriate date and time to enable the
* "expire" feature.
*/</span>
<span class="c1">// $exp = strtotime('2021-01-01 00:00:01');</span>
<span class="c1">// Get our server-side secret key from a secure location.</span>
<span class="nv">$serverKey</span> <span class="o">=</span> <span class="s1">'5f2b5cdbe5194f10b3241568fe4e2b24'</span><span class="p">;</span>
<span class="c1">// create a token</span>
<span class="nv">$payloadArray</span> <span class="o">=</span> <span class="k">array</span><span class="p">();</span>
<span class="nv">$payloadArray</span><span class="p">[</span><span class="s1">'userId'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$userId</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$nbf</span><span class="p">))</span> <span class="p">{</span><span class="nv">$payloadArray</span><span class="p">[</span><span class="s1">'nbf'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$nbf</span><span class="p">;}</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$exp</span><span class="p">))</span> <span class="p">{</span><span class="nv">$payloadArray</span><span class="p">[</span><span class="s1">'exp'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$exp</span><span class="p">;}</span>
<span class="nv">$token</span> <span class="o">=</span> <span class="no">JWT</span><span class="o">::</span><span class="nf">encode</span><span class="p">(</span><span class="nv">$payloadArray</span><span class="p">,</span> <span class="nv">$serverKey</span><span class="p">);</span>
<span class="c1">// return to caller</span>
<span class="nv">$returnArray</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'token'</span> <span class="o">=&gt;</span> <span class="nv">$token</span><span class="p">);</span>
<span class="nv">$jsonEncodedReturnArray</span> <span class="o">=</span> <span class="nb">json_encode</span><span class="p">(</span><span class="nv">$returnArray</span><span class="p">,</span> <span class="no">JSON_PRETTY_PRINT</span><span class="p">);</span>
<span class="k">echo</span> <span class="nv">$jsonEncodedReturnArray</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">else</span> <span class="p">{</span>
<span class="nv">$returnArray</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'error'</span> <span class="o">=&gt;</span> <span class="s1">'Invalid user ID or password.'</span><span class="p">);</span>
<span class="nv">$jsonEncodedReturnArray</span> <span class="o">=</span> <span class="nb">json_encode</span><span class="p">(</span><span class="nv">$returnArray</span><span class="p">,</span> <span class="no">JSON_PRETTY_PRINT</span><span class="p">);</span>
<span class="k">echo</span> <span class="nv">$jsonEncodedReturnArray</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">break</span><span class="p">;</span>
<span class="k">case</span> <span class="s1">'GET'</span><span class="o">:</span>
<span class="nv">$token</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$_GET</span><span class="p">[</span><span class="s1">'token'</span><span class="p">]))</span> <span class="p">{</span><span class="nv">$token</span> <span class="o">=</span> <span class="nv">$_GET</span><span class="p">[</span><span class="s1">'token'</span><span class="p">];}</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nb">is_null</span><span class="p">(</span><span class="nv">$token</span><span class="p">))</span> <span class="p">{</span>
<span class="k">require_once</span><span class="p">(</span><span class="s1">'jwt.php'</span><span class="p">);</span>
<span class="c1">// Get our server-side secret key from a secure location.</span>
<span class="nv">$serverKey</span> <span class="o">=</span> <span class="s1">'5f2b5cdbe5194f10b3241568fe4e2b24'</span><span class="p">;</span>
<span class="k">try</span> <span class="p">{</span>
<span class="nv">$payload</span> <span class="o">=</span> <span class="no">JWT</span><span class="o">::</span><span class="nf">decode</span><span class="p">(</span><span class="nv">$token</span><span class="p">,</span> <span class="nv">$serverKey</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="s1">'HS256'</span><span class="p">));</span>
<span class="nv">$returnArray</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'userId'</span> <span class="o">=&gt;</span> <span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">userId</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">exp</span><span class="p">))</span> <span class="p">{</span>
<span class="nv">$returnArray</span><span class="p">[</span><span class="s1">'exp'</span><span class="p">]</span> <span class="o">=</span> <span class="nb">date</span><span class="p">(</span><span class="nc">DateTime</span><span class="o">::</span><span class="no">ISO8601</span><span class="p">,</span> <span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">exp</span><span class="p">);;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">catch</span><span class="p">(</span><span class="nc">Exception</span> <span class="nv">$e</span><span class="p">)</span> <span class="p">{</span>
<span class="nv">$returnArray</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'error'</span> <span class="o">=&gt;</span> <span class="nv">$e</span><span class="o">-&gt;</span><span class="nf">getMessage</span><span class="p">());</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">else</span> <span class="p">{</span>
<span class="nv">$returnArray</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'error'</span> <span class="o">=&gt;</span> <span class="s1">'You are not logged in with a valid token.'</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">// return to caller</span>
<span class="nv">$jsonEncodedReturnArray</span> <span class="o">=</span> <span class="nb">json_encode</span><span class="p">(</span><span class="nv">$returnArray</span><span class="p">,</span> <span class="no">JSON_PRETTY_PRINT</span><span class="p">);</span>
<span class="k">echo</span> <span class="nv">$jsonEncodedReturnArray</span><span class="p">;</span>
<span class="k">break</span><span class="p">;</span>
<span class="k">default</span><span class="o">:</span>
<span class="nv">$returnArray</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'error'</span> <span class="o">=&gt;</span> <span class="s1">'You have requested an invalid method.'</span><span class="p">);</span>
<span class="nv">$jsonEncodedReturnArray</span> <span class="o">=</span> <span class="nb">json_encode</span><span class="p">(</span><span class="nv">$returnArray</span><span class="p">,</span> <span class="no">JSON_PRETTY_PRINT</span><span class="p">);</span>
<span class="k">echo</span> <span class="nv">$jsonEncodedReturnArray</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>jwt-php
</code></pre></div></div>
<div class="language-php highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">&lt;?php</span>
<span class="cd">/**
* JSON Web Token implementation, based on this spec:
* https://tools.ietf.org/html/rfc7519
*
* This class library is based on original Firebase/JWT source code written by
* Neuman Vong and Anant Narayanan found here: https://github.com/firebase/php-jwt
*
* @license http://opensource.org/licenses/BSD-3-Clause 3-clause BSD
*
*/</span>
<span class="kd">class</span> <span class="nc">JWT</span> <span class="p">{</span>
<span class="k">public</span> <span class="k">static</span> <span class="nv">$leeway</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="c1">// allows for nbf, iat or exp clock skew</span>
<span class="k">public</span> <span class="k">static</span> <span class="nv">$timestamp</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span> <span class="c1">// allow timestamp to be specified for testing. Defaults to php (time) if null.</span>
<span class="k">public</span> <span class="k">static</span> <span class="nv">$supported_algs</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
<span class="s1">'HS256'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'hash_hmac'</span><span class="p">,</span> <span class="s1">'SHA256'</span><span class="p">),</span>
<span class="s1">'HS512'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'hash_hmac'</span><span class="p">,</span> <span class="s1">'SHA512'</span><span class="p">),</span>
<span class="s1">'HS384'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'hash_hmac'</span><span class="p">,</span> <span class="s1">'SHA384'</span><span class="p">),</span>
<span class="s1">'RS256'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'openssl'</span><span class="p">,</span> <span class="s1">'SHA256'</span><span class="p">),</span>
<span class="s1">'RS384'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'openssl'</span><span class="p">,</span> <span class="s1">'SHA384'</span><span class="p">),</span>
<span class="s1">'RS512'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'openssl'</span><span class="p">,</span> <span class="s1">'SHA512'</span><span class="p">),</span>
<span class="p">);</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Decodes a JWT string into a PHP object.
*
* @param string $token The JSON web token
* @param string|array $key The secret key
* @param array $allowed_algs If the algorithm used is asymmetric, this is the public key list
* of supported verification algorithms. Supported algorithms are:
* 'HS256', 'HS384', 'HS512' and 'RS256'
*
* @return object The JWT's payload as a PHP object
*
*/</span>
<span class="k">public</span> <span class="k">static</span> <span class="k">function</span> <span class="n">decode</span><span class="p">(</span><span class="nv">$token</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="kt">array</span> <span class="nv">$allowed_algs</span> <span class="o">=</span> <span class="k">array</span><span class="p">())</span>
<span class="p">{</span>
<span class="k">if</span> <span class="p">((</span><span class="o">!</span><span class="k">isset</span><span class="p">(</span><span class="nv">$timestamp</span><span class="p">))</span> <span class="o">||</span> <span class="p">(</span><span class="nb">is_null</span><span class="p">(</span><span class="nv">$timestamp</span><span class="p">)))</span> <span class="p">{</span>
<span class="nv">$timestamp</span> <span class="o">=</span> <span class="nb">time</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="k">empty</span><span class="p">(</span><span class="nv">$key</span><span class="p">))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Invalid or missing key.'</span><span class="p">);</span>
<span class="p">}</span>
<span class="nv">$tokenSegments</span> <span class="o">=</span> <span class="nb">explode</span><span class="p">(</span><span class="s1">'.'</span><span class="p">,</span> <span class="nv">$token</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nb">count</span><span class="p">(</span><span class="nv">$tokenSegments</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">3</span><span class="p">)</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Wrong number of segments'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">list</span><span class="p">(</span><span class="nv">$headb64</span><span class="p">,</span> <span class="nv">$bodyb64</span><span class="p">,</span> <span class="nv">$cryptob64</span><span class="p">)</span> <span class="o">=</span> <span class="nv">$tokenSegments</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="kc">null</span> <span class="o">===</span> <span class="p">(</span><span class="nv">$header</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nf">jsonDecode</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nf">urlsafeB64Decode</span><span class="p">(</span><span class="nv">$headb64</span><span class="p">))))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Invalid header encoding'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="kc">null</span> <span class="o">===</span> <span class="nv">$payload</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nf">jsonDecode</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nf">urlsafeB64Decode</span><span class="p">(</span><span class="nv">$bodyb64</span><span class="p">)))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Invalid claims encoding'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="kc">false</span> <span class="o">===</span> <span class="p">(</span><span class="nv">$sig</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nf">urlsafeB64Decode</span><span class="p">(</span><span class="nv">$cryptob64</span><span class="p">)))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Invalid signature encoding'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="k">empty</span><span class="p">(</span><span class="nv">$header</span><span class="o">-&gt;</span><span class="n">alg</span><span class="p">))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Empty algorithm'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="k">empty</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nv">$supported_algs</span><span class="p">[</span><span class="nv">$header</span><span class="o">-&gt;</span><span class="n">alg</span><span class="p">]))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Algorithm not supported'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nb">in_array</span><span class="p">(</span><span class="nv">$header</span><span class="o">-&gt;</span><span class="n">alg</span><span class="p">,</span> <span class="nv">$allowed_algs</span><span class="p">))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Algorithm not allowed'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="nb">is_array</span><span class="p">(</span><span class="nv">$key</span><span class="p">)</span> <span class="o">||</span> <span class="nv">$key</span> <span class="k">instanceof</span> <span class="nc">ArrayAccess</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$header</span><span class="o">-&gt;</span><span class="n">kid</span><span class="p">))</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="k">isset</span><span class="p">(</span><span class="nv">$key</span><span class="p">[</span><span class="nv">$header</span><span class="o">-&gt;</span><span class="n">kid</span><span class="p">]))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">UnexpectedValueException</span><span class="p">(</span><span class="s1">'"kid" invalid, unable to lookup correct key'</span><span class="p">);</span>
<span class="p">}</span>
<span class="nv">$key</span> <span class="o">=</span> <span class="nv">$key</span><span class="p">[</span><span class="nv">$header</span><span class="o">-&gt;</span><span class="n">kid</span><span class="p">];</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">UnexpectedValueException</span><span class="p">(</span><span class="s1">'"kid" empty, unable to lookup correct key'</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="c1">// Check the signature</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="k">static</span><span class="o">::</span><span class="nf">verify</span><span class="p">(</span><span class="s2">"</span><span class="nv">$headb64</span><span class="s2">.</span><span class="nv">$bodyb64</span><span class="s2">"</span><span class="p">,</span> <span class="nv">$sig</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="nv">$header</span><span class="o">-&gt;</span><span class="n">alg</span><span class="p">))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Signature verification failed'</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">// Check if the nbf if it is defined. This is the time that the</span>
<span class="c1">// token can actually be used. If it's not yet that time, abort.</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">nbf</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">nbf</span> <span class="o">&gt;</span> <span class="p">(</span><span class="nv">$timestamp</span> <span class="o">+</span> <span class="k">static</span><span class="o">::</span><span class="nv">$leeway</span><span class="p">))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span>
<span class="s1">'Cannot handle token prior to '</span> <span class="mf">.</span> <span class="nb">date</span><span class="p">(</span><span class="nc">DateTime</span><span class="o">::</span><span class="no">ISO8601</span><span class="p">,</span> <span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">nbf</span><span class="p">)</span>
<span class="p">);</span>
<span class="p">}</span>
<span class="c1">// Check that this token has been created before 'now'. This prevents</span>
<span class="c1">// using tokens that have been created for later use (and haven't</span>
<span class="c1">// correctly used the nbf claim).</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">iat</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">iat</span> <span class="o">&gt;</span> <span class="p">(</span><span class="nv">$timestamp</span> <span class="o">+</span> <span class="k">static</span><span class="o">::</span><span class="nv">$leeway</span><span class="p">))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span>
<span class="s1">'Cannot handle token prior to '</span> <span class="mf">.</span> <span class="nb">date</span><span class="p">(</span><span class="nc">DateTime</span><span class="o">::</span><span class="no">ISO8601</span><span class="p">,</span> <span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">iat</span><span class="p">)</span>
<span class="p">);</span>
<span class="p">}</span>
<span class="c1">// Check if this token has expired.</span>
<span class="k">if</span> <span class="p">(</span><span class="k">isset</span><span class="p">(</span><span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">exp</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="p">(</span><span class="nv">$timestamp</span> <span class="o">-</span> <span class="k">static</span><span class="o">::</span><span class="nv">$leeway</span><span class="p">)</span> <span class="o">&gt;=</span> <span class="nv">$payload</span><span class="o">-&gt;</span><span class="n">exp</span><span class="p">)</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Expired token'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nv">$payload</span><span class="p">;</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Converts and signs a PHP object or array into a JWT string.
*
* @param object|array $payload PHP object or array
* @param string $key The secret key.
* If the algorithm used is asymmetric, this is the private key
* @param string $alg The signing algorithm.
* Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
* @param mixed $keyId
* @param array $head An array with header elements to attach
*
* @return string A signed JWT
*
*/</span>
<span class="k">public</span> <span class="k">static</span> <span class="k">function</span> <span class="n">encode</span><span class="p">(</span><span class="nv">$payload</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="nv">$alg</span> <span class="o">=</span> <span class="s1">'HS256'</span><span class="p">,</span> <span class="nv">$keyId</span> <span class="o">=</span> <span class="kc">null</span><span class="p">,</span> <span class="nv">$head</span> <span class="o">=</span> <span class="kc">null</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$header</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'typ'</span> <span class="o">=&gt;</span> <span class="s1">'JWT'</span><span class="p">,</span> <span class="s1">'alg'</span> <span class="o">=&gt;</span> <span class="nv">$alg</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$keyId</span> <span class="o">!==</span> <span class="kc">null</span><span class="p">)</span> <span class="p">{</span>
<span class="nv">$header</span><span class="p">[</span><span class="s1">'kid'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$keyId</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span> <span class="k">isset</span><span class="p">(</span><span class="nv">$head</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="nb">is_array</span><span class="p">(</span><span class="nv">$head</span><span class="p">)</span> <span class="p">)</span> <span class="p">{</span>
<span class="nv">$header</span> <span class="o">=</span> <span class="nb">array_merge</span><span class="p">(</span><span class="nv">$head</span><span class="p">,</span> <span class="nv">$header</span><span class="p">);</span>
<span class="p">}</span>
<span class="nv">$segments</span> <span class="o">=</span> <span class="k">array</span><span class="p">();</span>
<span class="nv">$segments</span><span class="p">[]</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nf">urlsafeB64Encode</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nf">jsonEncode</span><span class="p">(</span><span class="nv">$header</span><span class="p">));</span>
<span class="nv">$segments</span><span class="p">[]</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nf">urlsafeB64Encode</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nf">jsonEncode</span><span class="p">(</span><span class="nv">$payload</span><span class="p">));</span>
<span class="nv">$signing_input</span> <span class="o">=</span> <span class="nb">implode</span><span class="p">(</span><span class="s1">'.'</span><span class="p">,</span> <span class="nv">$segments</span><span class="p">);</span>
<span class="nv">$signature</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nf">sign</span><span class="p">(</span><span class="nv">$signing_input</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="nv">$alg</span><span class="p">);</span>
<span class="nv">$segments</span><span class="p">[]</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nf">urlsafeB64Encode</span><span class="p">(</span><span class="nv">$signature</span><span class="p">);</span>
<span class="k">return</span> <span class="nb">implode</span><span class="p">(</span><span class="s1">'.'</span><span class="p">,</span> <span class="nv">$segments</span><span class="p">);</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Sign a string with a given key and algorithm.
*
* @param string $msg The message to sign
* @param string|resource $key The secret key
* @param string $alg The signing algorithm.
* Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
*
* @return string An encrypted message
*
*/</span>
<span class="k">public</span> <span class="k">static</span> <span class="k">function</span> <span class="n">sign</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="nv">$alg</span> <span class="o">=</span> <span class="s1">'HS256'</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="k">empty</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nv">$supported_algs</span><span class="p">[</span><span class="nv">$alg</span><span class="p">]))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Algorithm not supported'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">list</span><span class="p">(</span><span class="nv">$function</span><span class="p">,</span> <span class="nv">$algorithm</span><span class="p">)</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nv">$supported_algs</span><span class="p">[</span><span class="nv">$alg</span><span class="p">];</span>
<span class="k">switch</span><span class="p">(</span><span class="nv">$function</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="s1">'hash_hmac'</span><span class="o">:</span>
<span class="k">return</span> <span class="nb">hash_hmac</span><span class="p">(</span><span class="nv">$algorithm</span><span class="p">,</span> <span class="nv">$msg</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="kc">true</span><span class="p">);</span>
<span class="k">case</span> <span class="s1">'openssl'</span><span class="o">:</span>
<span class="nv">$signature</span> <span class="o">=</span> <span class="s1">''</span><span class="p">;</span>
<span class="nv">$success</span> <span class="o">=</span> <span class="nb">openssl_sign</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$signature</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="nv">$algorithm</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nv">$success</span><span class="p">)</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s2">"OpenSSL unable to sign data"</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="k">return</span> <span class="nv">$signature</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Verify a signature with the message, key and method. Not all methods
* are symmetric, so we must have a separate verify and sign method.
*
* @param string $msg The original message (header and body)
* @param string $signature The original signature
* @param string|resource $key For HS*, a string key works. for RS*, must be a resource of an openssl public key
* @param string $alg The algorithm
*
* @return bool
*/</span>
<span class="k">private</span> <span class="k">static</span> <span class="k">function</span> <span class="n">verify</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$signature</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="nv">$alg</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="k">empty</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nv">$supported_algs</span><span class="p">[</span><span class="nv">$alg</span><span class="p">]))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Algorithm not supported'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">list</span><span class="p">(</span><span class="nv">$function</span><span class="p">,</span> <span class="nv">$algorithm</span><span class="p">)</span> <span class="o">=</span> <span class="k">static</span><span class="o">::</span><span class="nv">$supported_algs</span><span class="p">[</span><span class="nv">$alg</span><span class="p">];</span>
<span class="k">switch</span><span class="p">(</span><span class="nv">$function</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="s1">'openssl'</span><span class="o">:</span>
<span class="nv">$success</span> <span class="o">=</span> <span class="nb">openssl_verify</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$signature</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="nv">$algorithm</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$success</span> <span class="o">===</span> <span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
<span class="p">}</span> <span class="k">elseif</span> <span class="p">(</span><span class="nv">$success</span> <span class="o">===</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
<span class="p">}</span>
<span class="c1">// returns 1 on success, 0 on failure, -1 on error.</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span>
<span class="s1">'OpenSSL error: '</span> <span class="mf">.</span> <span class="nb">openssl_error_string</span><span class="p">()</span>
<span class="p">);</span>
<span class="k">case</span> <span class="s1">'hash_hmac'</span><span class="o">:</span>
<span class="k">default</span><span class="o">:</span>
<span class="nv">$hash</span> <span class="o">=</span> <span class="nb">hash_hmac</span><span class="p">(</span><span class="nv">$algorithm</span><span class="p">,</span> <span class="nv">$msg</span><span class="p">,</span> <span class="nv">$key</span><span class="p">,</span> <span class="kc">true</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nb">function_exists</span><span class="p">(</span><span class="s1">'hash_equals'</span><span class="p">))</span> <span class="p">{</span>
<span class="k">return</span> <span class="nb">hash_equals</span><span class="p">(</span><span class="nv">$signature</span><span class="p">,</span> <span class="nv">$hash</span><span class="p">);</span>
<span class="p">}</span>
<span class="nv">$len</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nf">safeStrlen</span><span class="p">(</span><span class="nv">$signature</span><span class="p">),</span> <span class="k">static</span><span class="o">::</span><span class="nf">safeStrlen</span><span class="p">(</span><span class="nv">$hash</span><span class="p">));</span>
<span class="nv">$status</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span><span class="nv">$i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nv">$i</span> <span class="o">&lt;</span> <span class="nv">$len</span><span class="p">;</span> <span class="nv">$i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
<span class="nv">$status</span> <span class="o">|=</span> <span class="p">(</span><span class="nb">ord</span><span class="p">(</span><span class="nv">$signature</span><span class="p">[</span><span class="nv">$i</span><span class="p">])</span> <span class="o">^</span> <span class="nb">ord</span><span class="p">(</span><span class="nv">$hash</span><span class="p">[</span><span class="nv">$i</span><span class="p">]));</span>
<span class="p">}</span>
<span class="nv">$status</span> <span class="o">|=</span> <span class="p">(</span><span class="k">static</span><span class="o">::</span><span class="nf">safeStrlen</span><span class="p">(</span><span class="nv">$signature</span><span class="p">)</span> <span class="o">^</span> <span class="k">static</span><span class="o">::</span><span class="nf">safeStrlen</span><span class="p">(</span><span class="nv">$hash</span><span class="p">));</span>
<span class="k">return</span> <span class="p">(</span><span class="nv">$status</span> <span class="o">===</span> <span class="mi">0</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Decode a JSON string into a PHP object.
*
* @param string $input JSON string
*
* @return object Object representation of JSON string
*
* @throws Exception Provided string was invalid JSON
*/</span>
<span class="k">public</span> <span class="k">static</span> <span class="k">function</span> <span class="n">jsonDecode</span><span class="p">(</span><span class="nv">$input</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="nb">version_compare</span><span class="p">(</span><span class="kc">PHP_VERSION</span><span class="p">,</span> <span class="s1">'5.4.0'</span><span class="p">,</span> <span class="s1">'&gt;='</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="p">(</span><span class="nb">defined</span><span class="p">(</span><span class="s1">'JSON_C_VERSION'</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="kc">PHP_INT_SIZE</span> <span class="o">&gt;</span> <span class="mi">4</span><span class="p">))</span> <span class="p">{</span>
<span class="cd">/** In PHP &gt;=5.4.0, json_decode() accepts an options parameter, that allows you
* to specify that large ints (like Steam Transaction IDs) should be treated as
* strings, rather than the PHP default behaviour of converting them to floats.
*/</span>
<span class="nv">$obj</span> <span class="o">=</span> <span class="nb">json_decode</span><span class="p">(</span><span class="nv">$input</span><span class="p">,</span> <span class="kc">false</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> <span class="no">JSON_BIGINT_AS_STRING</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="cd">/** Not all servers will support that, however, so for older versions we must
* manually detect large ints in the JSON string and quote them (thus converting
*them to strings) before decoding, hence the preg_replace() call.
*/</span>
<span class="nv">$max_int_length</span> <span class="o">=</span> <span class="nb">strlen</span><span class="p">((</span><span class="n">string</span><span class="p">)</span> <span class="kc">PHP_INT_MAX</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">;</span>
<span class="nv">$json_without_bigints</span> <span class="o">=</span> <span class="nb">preg_replace</span><span class="p">(</span><span class="s1">'/:\s*(-?\d{'</span><span class="mf">.</span><span class="nv">$max_int_length</span><span class="mf">.</span><span class="s1">',})/'</span><span class="p">,</span> <span class="s1">': "$1"'</span><span class="p">,</span> <span class="nv">$input</span><span class="p">);</span>
<span class="nv">$obj</span> <span class="o">=</span> <span class="nb">json_decode</span><span class="p">(</span><span class="nv">$json_without_bigints</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="nb">function_exists</span><span class="p">(</span><span class="s1">'json_last_error'</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="nv">$errno</span> <span class="o">=</span> <span class="nb">json_last_error</span><span class="p">())</span> <span class="p">{</span>
<span class="k">static</span><span class="o">::</span><span class="nf">handleJsonError</span><span class="p">(</span><span class="nv">$errno</span><span class="p">);</span>
<span class="p">}</span> <span class="k">elseif</span> <span class="p">(</span><span class="nv">$obj</span> <span class="o">===</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="nv">$input</span> <span class="o">!==</span> <span class="s1">'null'</span><span class="p">)</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Null result with non-null input'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nv">$obj</span><span class="p">;</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Encode a PHP object into a JSON string.
*
* @param object|array $input A PHP object or array
*
* @return string JSON representation of the PHP object or array
*
* @throws Exception Provided object could not be encoded to valid JSON
*/</span>
<span class="k">public</span> <span class="k">static</span> <span class="k">function</span> <span class="n">jsonEncode</span><span class="p">(</span><span class="nv">$input</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$json</span> <span class="o">=</span> <span class="nb">json_encode</span><span class="p">(</span><span class="nv">$input</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nb">function_exists</span><span class="p">(</span><span class="s1">'json_last_error'</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="nv">$errno</span> <span class="o">=</span> <span class="nb">json_last_error</span><span class="p">())</span> <span class="p">{</span>
<span class="k">static</span><span class="o">::</span><span class="nf">handleJsonError</span><span class="p">(</span><span class="nv">$errno</span><span class="p">);</span>
<span class="p">}</span> <span class="k">elseif</span> <span class="p">(</span><span class="nv">$json</span> <span class="o">===</span> <span class="s1">'null'</span> <span class="o">&amp;&amp;</span> <span class="nv">$input</span> <span class="o">!==</span> <span class="kc">null</span><span class="p">)</span> <span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span><span class="s1">'Null result with non-null input'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nv">$json</span><span class="p">;</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Decode a string with URL-safe Base64.
*
* @param string $input A Base64 encoded string
*
* @return string A decoded string
*/</span>
<span class="k">public</span> <span class="k">static</span> <span class="k">function</span> <span class="n">urlsafeB64Decode</span><span class="p">(</span><span class="nv">$input</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$remainder</span> <span class="o">=</span> <span class="nb">strlen</span><span class="p">(</span><span class="nv">$input</span><span class="p">)</span> <span class="o">%</span> <span class="mi">4</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$remainder</span><span class="p">)</span> <span class="p">{</span>
<span class="nv">$padlen</span> <span class="o">=</span> <span class="mi">4</span> <span class="o">-</span> <span class="nv">$remainder</span><span class="p">;</span>
<span class="nv">$input</span> <span class="mf">.</span><span class="o">=</span> <span class="nb">str_repeat</span><span class="p">(</span><span class="s1">'='</span><span class="p">,</span> <span class="nv">$padlen</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nb">base64_decode</span><span class="p">(</span><span class="nb">strtr</span><span class="p">(</span><span class="nv">$input</span><span class="p">,</span> <span class="s1">'-_'</span><span class="p">,</span> <span class="s1">'+/'</span><span class="p">));</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Encode a string with URL-safe Base64.
*
* @param string $input The string you want encoded
*
* @return string The base64 encode of what you passed in
*/</span>
<span class="k">public</span> <span class="k">static</span> <span class="k">function</span> <span class="n">urlsafeB64Encode</span><span class="p">(</span><span class="nv">$input</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="nb">str_replace</span><span class="p">(</span><span class="s1">'='</span><span class="p">,</span> <span class="s1">''</span><span class="p">,</span> <span class="nb">strtr</span><span class="p">(</span><span class="nb">base64_encode</span><span class="p">(</span><span class="nv">$input</span><span class="p">),</span> <span class="s1">'+/'</span><span class="p">,</span> <span class="s1">'-_'</span><span class="p">));</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Helper method to create a JSON error.
*
* @param int $errno An error number from json_last_error()
*
* @return void
*/</span>
<span class="k">private</span> <span class="k">static</span> <span class="k">function</span> <span class="n">handleJsonError</span><span class="p">(</span><span class="nv">$errno</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$messages</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
<span class="no">JSON_ERROR_DEPTH</span> <span class="o">=&gt;</span> <span class="s1">'Maximum stack depth exceeded'</span><span class="p">,</span>
<span class="no">JSON_ERROR_STATE_MISMATCH</span> <span class="o">=&gt;</span> <span class="s1">'Invalid or malformed JSON'</span><span class="p">,</span>
<span class="no">JSON_ERROR_CTRL_CHAR</span> <span class="o">=&gt;</span> <span class="s1">'Unexpected control character found'</span><span class="p">,</span>
<span class="no">JSON_ERROR_SYNTAX</span> <span class="o">=&gt;</span> <span class="s1">'Syntax error, malformed JSON'</span><span class="p">,</span>
<span class="no">JSON_ERROR_UTF8</span> <span class="o">=&gt;</span> <span class="s1">'Malformed UTF-8 characters'</span> <span class="c1">//PHP &gt;= 5.3.3</span>
<span class="p">);</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nc">Exception</span><span class="p">(</span>
<span class="k">isset</span><span class="p">(</span><span class="nv">$messages</span><span class="p">[</span><span class="nv">$errno</span><span class="p">])</span>
<span class="o">?</span> <span class="nv">$messages</span><span class="p">[</span><span class="nv">$errno</span><span class="p">]</span>
<span class="o">:</span> <span class="s1">'Unknown JSON error: '</span> <span class="mf">.</span> <span class="nv">$errno</span>
<span class="p">);</span>
<span class="p">}</span>
<span class="cd">/** ----------------------------------------------------------------------------------------------------------
* Get the number of bytes in cryptographic strings.
*
* @param string
*
* @return int
*/</span>
<span class="k">private</span> <span class="k">static</span> <span class="k">function</span> <span class="n">safeStrlen</span><span class="p">(</span><span class="nv">$str</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="nb">function_exists</span><span class="p">(</span><span class="s1">'mb_strlen'</span><span class="p">))</span> <span class="p">{</span>
<span class="k">return</span> <span class="nb">mb_strlen</span><span class="p">(</span><span class="nv">$str</span><span class="p">,</span> <span class="s1">'8bit'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nb">strlen</span><span class="p">(</span><span class="nv">$str</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div></div>
<hr />
<h2 id="chiffrement-par-clé-secrète">Chiffrement par clé secrète</h2>
<p>Le cryptage par clé secrète (ou cryptage symétrique comme on l’appelle aussi) utilise une seule clé pour crypter et décrypter les données. Voyons comment nous allons mettre en place un tel mécanisme en utilisant Sodium, qui a été introduit dans PHP 7.2. Si vous utilisez une version plus ancienne de PHP, vous pouvez installer sodium via PECL.</p>
<p>Tout d’abord, nous avons besoin d’une clé de cryptage, qui peut être générée en utilisant la fonction <code class="language-plaintext highlighter-rouge">random_bytes()</code>. Habituellement, vous ne le ferez qu’une seule fois et le stockerez comme variable d’environnement. Rappelez-vous que cette clé doit être gardée secrète à tout prix. Une fois que la clé est compromise, les données cryptées le sont aussi.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$key = random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES);
</code></pre></div></div>
<p>Pour crypter la valeur, nous la passons à <code class="language-plaintext highlighter-rouge">sodium_crypto_secretbox()</code> avec notre <code class="language-plaintext highlighter-rouge">$key</code> et un <code class="language-plaintext highlighter-rouge">$nonce</code>. Le nonce est généré en utilisant <code class="language-plaintext highlighter-rouge">random_bytes()</code>, car le même nonce ne doit jamais être réutilisé.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox('This is a secret!', $nonce, $key);
</code></pre></div></div>
<p>Cela pose un problème car nous avons besoin du nonce pour décrypter la valeur plus tard. Heureusement, les nonces n’ont pas besoin d’être gardées secrètes pour que nous puissions les préfixer à notre $ciphertext puis base64_encode() la valeur avant de les enregistrer dans la base de données.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$encoded = base64_encode($nonce . $ciphertext);
var_dump($encoded);
// string 'v6KhzRACVfUCyJKCGQF4VNoPXYfeFY+/pyRZcixz4x/0jLJOo+RbeGBTiZudMLEO7aRvg44HRecC' (length=76)
</code></pre></div></div>
<p>Lorsqu’il s’agit de décrypter la valeur, nous faisons le contraire.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$decoded = base64_decode($encoded);
</code></pre></div></div>
<p>Parce que nous connaissons la longueur de nonce, nous pouvons l’extraire en utilisant <code class="language-plaintext highlighter-rouge">mb_substr()</code> avant de décrypter la valeur.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$nonce = mb_substr($decoded, 0, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '8bit');
$ciphertext = mb_substr($decoded, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit');
$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
var_dump($plaintext);
// string 'This is a secret!' (length=17)
</code></pre></div></div>
<p>Exemples</p>
<div class="language-php highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">&lt;?php</span>
<span class="k">echo</span> <span class="s2">"Chiffrage</span><span class="se">\n</span><span class="s2">"</span><span class="p">;</span>
<span class="nv">$key</span> <span class="o">=</span> <span class="nb">random_bytes</span><span class="p">(</span><span class="no">SODIUM_CRYPTO_SECRETBOX_KEYBYTES</span><span class="p">);</span>
<span class="nv">$nonce</span> <span class="o">=</span> <span class="nb">random_bytes</span><span class="p">(</span><span class="no">SODIUM_CRYPTO_SECRETBOX_NONCEBYTES</span><span class="p">);</span>
<span class="nv">$ciphertext</span> <span class="o">=</span> <span class="nb">sodium_crypto_secretbox</span><span class="p">(</span><span class="s1">'This is a secret!'</span><span class="p">,</span> <span class="nv">$nonce</span><span class="p">,</span> <span class="nv">$key</span><span class="p">);</span>
<span class="nv">$encoded</span> <span class="o">=</span> <span class="nb">base64_encode</span><span class="p">(</span><span class="nv">$nonce</span> <span class="mf">.</span> <span class="nv">$ciphertext</span><span class="p">);</span>
<span class="nb">var_dump</span><span class="p">(</span><span class="nv">$encoded</span><span class="p">);</span>
<span class="k">echo</span> <span class="s2">"Déchiffrage</span><span class="se">\n</span><span class="s2">"</span><span class="p">;</span>
<span class="nv">$decoded</span> <span class="o">=</span> <span class="nb">base64_decode</span><span class="p">(</span><span class="nv">$encoded</span><span class="p">);</span>
<span class="nv">$nonce</span> <span class="o">=</span> <span class="nb">mb_substr</span><span class="p">(</span><span class="nv">$decoded</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="no">SODIUM_CRYPTO_SECRETBOX_NONCEBYTES</span><span class="p">,</span> <span class="s1">'8bit'</span><span class="p">);</span>
<span class="nv">$ciphertext</span> <span class="o">=</span> <span class="nb">mb_substr</span><span class="p">(</span><span class="nv">$decoded</span><span class="p">,</span> <span class="no">SODIUM_CRYPTO_SECRETBOX_NONCEBYTES</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="s1">'8bit'</span><span class="p">);</span>
<span class="nv">$plaintext</span> <span class="o">=</span> <span class="nb">sodium_crypto_secretbox_open</span><span class="p">(</span><span class="nv">$ciphertext</span><span class="p">,</span> <span class="nv">$nonce</span><span class="p">,</span> <span class="nv">$key</span><span class="p">);</span>
<span class="nb">var_dump</span><span class="p">(</span><span class="nv">$plaintext</span><span class="p">);</span>
<span class="nv">$msg</span> <span class="o">=</span> <span class="s1">'This is a super secret message!'</span><span class="p">;</span>
<span class="c1">// Generating an encryption key and a nonce</span>
<span class="nv">$key</span> <span class="o">=</span> <span class="nb">random_bytes</span><span class="p">(</span><span class="no">SODIUM_CRYPTO_SECRETBOX_KEYBYTES</span><span class="p">);</span> <span class="c1">// 256 bit</span>
<span class="nv">$nonce</span> <span class="o">=</span> <span class="nb">random_bytes</span><span class="p">(</span><span class="no">SODIUM_CRYPTO_SECRETBOX_NONCEBYTES</span><span class="p">);</span> <span class="c1">// 24 bytes</span>
<span class="c1">// Encrypt</span>
<span class="nv">$ciphertext</span> <span class="o">=</span> <span class="nb">sodium_crypto_secretbox</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$nonce</span><span class="p">,</span> <span class="nv">$key</span><span class="p">);</span>
<span class="c1">// Decrypt</span>
<span class="nv">$plaintext</span> <span class="o">=</span> <span class="nb">sodium_crypto_secretbox_open</span><span class="p">(</span><span class="nv">$ciphertext</span><span class="p">,</span> <span class="nv">$nonce</span><span class="p">,</span> <span class="nv">$key</span><span class="p">);</span>
<span class="k">echo</span> <span class="nv">$plaintext</span> <span class="o">===</span> <span class="nv">$msg</span> <span class="o">?</span> <span class="s1">'Success'</span> <span class="o">:</span> <span class="s1">'Error'</span><span class="p">;</span>
<span class="nv">$msg</span> <span class="o">=</span> <span class="s1">'This is the message to authenticate!'</span><span class="p">;</span>
<span class="nv">$key</span> <span class="o">=</span> <span class="nb">random_bytes</span><span class="p">(</span><span class="no">SODIUM_CRYPTO_SECRETBOX_KEYBYTES</span><span class="p">);</span> <span class="c1">// 256 bit</span>
<span class="c1">// Generate the Message Authentication Code</span>
<span class="nv">$mac</span> <span class="o">=</span> <span class="nb">sodium_crypto_auth</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$key</span><span class="p">);</span>
<span class="c1">// Altering $mac or $msg, verification will fail</span>
<span class="k">echo</span> <span class="nb">sodium_crypto_auth_verify</span><span class="p">(</span><span class="nv">$mac</span><span class="p">,</span> <span class="nv">$msg</span><span class="p">,</span> <span class="nv">$key</span><span class="p">)</span> <span class="o">?</span> <span class="s1">'Success'</span> <span class="o">:</span> <span class="s1">'Error'</span><span class="p">;</span>
<span class="nv">$password</span> <span class="o">=</span> <span class="s1">'password'</span><span class="p">;</span>
<span class="k">echo</span> <span class="s2">"</span><span class="se">\n</span><span class="s2">Argon2i with Sodium</span><span class="se">\n</span><span class="s2">"</span><span class="p">;</span>
<span class="nv">$hash</span> <span class="o">=</span> <span class="nb">sodium_crypto_pwhash_str</span><span class="p">(</span>
<span class="nv">$password</span><span class="p">,</span>
<span class="no">SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE</span><span class="p">,</span>
<span class="no">SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE</span>
<span class="p">);</span> <span class="c1">// 97 bytes</span>
<span class="k">echo</span> <span class="nb">sodium_crypto_pwhash_str_verify</span><span class="p">(</span><span class="nv">$hash</span><span class="p">,</span> <span class="nv">$password</span><span class="p">)</span> <span class="o">?</span>
<span class="s1">'OK'</span> <span class="o">:</span> <span class="s1">'Error'</span><span class="p">;</span>
<span class="k">echo</span> <span class="s2">"</span><span class="se">\n</span><span class="s2">Argon2i without Sodium</span><span class="se">\n</span><span class="s2">"</span><span class="p">;</span>
<span class="nv">$hash</span> <span class="o">=</span> <span class="nb">password_hash</span><span class="p">(</span><span class="nv">$password</span><span class="p">,</span> <span class="no">PASSWORD_ARGON2I</span><span class="p">);</span> <span class="c1">// 95 bytes</span>
<span class="k">echo</span> <span class="nb">password_verify</span><span class="p">(</span><span class="nv">$password</span><span class="p">,</span> <span class="nv">$hash</span><span class="p">)</span> <span class="o">?</span> <span class="s1">'OK'</span> <span class="o">:</span> <span class="s1">'Error'</span><span class="p">;</span>
<span class="cp">?&gt;</span>
</code></pre></div></div>
<p>C’est tout ce qu’il y a à faire avec le cryptage par clé secrète en PHP, grâce à Sodium !</p>
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if (scrollTop >= headingsPos[i]) {
$activeCur = $tocLi.eq(i);
} else {
$activeCur || ($activeCur = $tocLi.eq(i));
break;
}
}
}
$activeLast && $activeLast.removeClass('active');
($activeLast = $activeCur).addClass('active');
}
function render() {
if(!hasRendered) {
$root.append($tocUl);
$headings.each(function() {
var $this = $(this);
$tocUl.append($('<li></li>').addClass('toc-' + $this.prop('tagName').toLowerCase())
.append($('<a></a>').text($this.text()).attr('href', '#' + $this.prop('id'))));
});
$tocLi = $tocUl.children('li');
$tocUl.on('click', 'a', function(e) {
e.preventDefault();
var $this = $(this);
scrolling = true;
setState($this.parent());
$scroller.scrollToAnchor($this.attr('href'), 400, function() {
scrolling = false;
});
});
}
hasRendered = true;
}
function init() {
var interval, timeout;
if(!hasInit) {
render(); calc(); setState(null, scrolling);
// run calc every 100 millisecond
interval = setInterval(function() {
calc();
}, 100);
timeout = setTimeout(function() {
clearInterval(interval);
}, 45000);
window.pageLoad.then(function() {
setTimeout(function() {
clearInterval(interval);
clearTimeout(timeout);
}, 3000);
});
$scrollTarget.on('scroll', function() {
disabled || setState(null, scrolling);
});
$window.on('resize', window.throttle(function() {
if (!disabled) {
render(); calc(); setState(null, scrolling);
}
}, 100));
}
hasInit = true;
}
setOptions(options);
if (!disabled) {
init();
}
$window.on('resize', window.throttle(function() {
init();
}, 200));
return {
setOptions: setOptions
};
}
$.fn.toc = toc;
});
})();
/*(function () {
})();*/
</script><script>
/* toc must before affix, since affix need to konw toc' height. */(function() {
var SOURCES = window.TEXT_VARIABLES.sources;
var TOC_SELECTOR = window.TEXT_VARIABLES.site.toc.selectors;
window.Lazyload.js(SOURCES.jquery, function() {
var $window = $(window);
var $articleContent = $('.js-article-content');
var $tocRoot = $('.js-toc-root'), $col2 = $('.js-col-aside');
var toc;
var tocDisabled = false;
var hasSidebar = $('.js-page-root').hasClass('layout--page--sidebar');
var hasToc = $articleContent.find(TOC_SELECTOR).length > 0;
function disabled() {
return $col2.css('display') === 'none' || !hasToc;
}
tocDisabled = disabled();
toc = $tocRoot.toc({
selectors: TOC_SELECTOR,
container: $articleContent,
scrollTarget: hasSidebar ? '.js-page-main' : null,
scroller: hasSidebar ? '.js-page-main' : null,
disabled: tocDisabled
});
$window.on('resize', window.throttle(function() {
tocDisabled = disabled();
toc && toc.setOptions({
disabled: tocDisabled
});
}, 100));
});
})();
(function() {
var SOURCES = window.TEXT_VARIABLES.sources;
window.Lazyload.js(SOURCES.jquery, function() {
var $window = $(window), $pageFooter = $('.js-page-footer');
var $pageAside = $('.js-page-aside');
var affix;
var tocDisabled = false;
var hasSidebar = $('.js-page-root').hasClass('layout--page--sidebar');
affix = $pageAside.affix({
offsetBottom: $pageFooter.outerHeight(),
scrollTarget: hasSidebar ? '.js-page-main' : null,
scroller: hasSidebar ? '.js-page-main' : null,
scroll: hasSidebar ? $('.js-page-main').children() : null,
disabled: tocDisabled
});
$window.on('resize', window.throttle(function() {
affix && affix.setOptions({
disabled: tocDisabled
});
}, 100));
window.pageAsideAffix = affix;
});
})();
</script><!---->
</div>
<script>(function () {
var $root = document.getElementsByClassName('root')[0];
if (window.hasEvent('touchstart')) {
$root.dataset.isTouch = true;
document.addEventListener('touchstart', function(){}, false);
}
})();
</script>
</body>
</html>
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