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<h1 id="dev_page_title">auth.bindTempAuthKey</h1>
<div id="dev_page_content"><p>Binds a temporary authorization key <code>temp_auth_key_id</code> to the permanent authorization key <code>perm_auth_key_id</code>. Each permanent key may only be bound to one temporary key at a time, binding a new temporary key overwrites the previous one.</p>
<p>For more information, see <a href="/api/pfs">Perfect Forward Secrecy</a>.</p>
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<li><a href="?layer=1">1 &ndash; Base layer</a></li><li><a href="?layer=2">2 &ndash; New userpic notifications</a></li><li><a href="?layer=3">3 &ndash; Send message can trigger link change</a></li><li><a href="?layer=4">4 &ndash; Check-in chats</a></li><li><a href="?layer=5">5 &ndash; Localized SMS, localized notifications</a></li><li><a href="?layer=6">6 &ndash; Foursquare integration</a></li><li><a href="?layer=7">7 &ndash; Added wallPaperSolid</a></li><li><a href="?layer=8">8 &ndash; Added end-to-end encryption</a></li><li><a href="?layer=9">9 &ndash; Improved big files upload perfomance</a></li><li><a href="?layer=10">10 &ndash; Improved chat participants updates</a></li><li><a href="?layer=11">11 &ndash; Improved secret chats</a></li><li><a href="?layer=12">12 &ndash; New dynamic support</a></li><li><a href="?layer=13">13 &ndash; Audio, video MIME; contacts import retry; new secret actions</a></li><li><a href="?layer=14">14 &ndash; Notify settings sync, blacklist sync</a></li><li><a href="?layer=15">15 &ndash; Modified getHistory offset behaviour</a></li><li><a href="?layer=16">16 &ndash; Split sendCode into 2 parts</a></li><li><a href="?layer=17">17 &ndash; Added custom typing, introduced message flags</a></li><li><a href="?layer=18">18 &ndash; Added usernames</a></li><li><a href="?layer=23">23 &ndash; Stickers for secret chats</a></li><li><a href="?layer=105">105 &ndash; Scheduled messages, Cloud themes</a></li><li><a href="?layer=108">108 &ndash; Login with QR code</a></li><li><a href="?layer=109">109 &ndash; Polls v2</a></li><li><a href="?layer=110">110 &ndash; People Nearby 2.0, Bank card entity</a></li><li><a href="?layer=111">111 &ndash; Folders, Broadcast Stats</a></li><li><a href="?layer=112">112 &ndash; Old featured stickers, generic dice, poll timer, poll solution</a></li><li><a href="?layer=113">113 &ndash; PSA</a></li><li><a href="?layer=114">114 &ndash; Video thumbs for GIFs</a></li><li><a href="?layer=115">115 &ndash; Peek Channel Invite</a></li><li><a href="?layer=116">116 &ndash; Group Stats, Profile Videos</a></li><li><a href="?layer=117">117 &ndash; WebRTC Phone Calls</a></li><li><a href="?layer=118">118 &ndash; Callback with 2FA, Countries list</a></li><li><a href="?layer=119">119 &ndash; Comments in channels, Threads, Anonymous Admins</a></li><li><a href="?layer=120">120 &ndash; Multipins, Message Stats, GeoLive v2</a></li><li><a href="?layer=121">121 &ndash; SVG-based Outlines for Stickers</a></li><li><a href="?layer=122">122 &ndash; Voice Chats</a></li><li><a href="?layer=123">123 &ndash; Voice Chat improvements</a></li><li><a href="?layer=124">124 &ndash; Expiring Invite links</a></li><li><a href="?layer=125">125 &ndash; Voice Chats in Broadcasts</a></li><li><a href="?layer=126">126 &ndash; Ban channels in channels</a></li><li><a href="?layer=127">127 &ndash; Payments in channels</a></li><li><a href="?layer=128">128 &ndash; Microthumbs for User/Chat profile photos</a></li><li><a href="?layer=129">129 &ndash; Video Chats</a></li><li><a href="?layer=130">130 &ndash; Custom placeholder for bot reply keyboards</a></li><li><a href="?layer=131">131 &ndash; Reset 2FA Password after a week</a></li><li><a href="?layer=132">132 &ndash; Chat themes</a></li><li><a href="?layer=133">133 &ndash; 64-bit IDs for User/Chat</a></li><li><a href="?layer=134">134 &ndash; Chat Requests, Shared Media Calendar</a></li><li><a href="?layer=135">135 &ndash; Send Message As a Channel</a></li><li><a href="?layer=136">136 &ndash; Reactions</a></li><li><a href="?layer=137">137 &ndash; Translations</a></li><li><a href="?layer=138">138 &ndash; GIF Sticker Packs</a></li><li><a href="?layer=139">139 &ndash; RTMP streaming</a></li><li><a href="?layer=140">140 &ndash; WebApps, Cloud Ringtones</a></li><li><a href="?layer=142">142 &ndash; TCP Reflectors</a></li><li><a href="?layer=143">143 &ndash; Premium Subscription, Cloud Invoices</a></li><li><a href="?layer=144">144 &ndash; Premium as a Gift, Custom Emoji</a></li><li><a href="?layer=145"><strong>145 &ndash; Custom Reactions, Statuses, Sign In with email</strong></a></li>
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<pre class="page_scheme"><code><a href="/constructor/boolFalse" >boolFalse</a>#bc799737 = <a href="/type/Bool" >Bool</a>;
<a href="/constructor/boolTrue" >boolTrue</a>#997275b5 = <a href="/type/Bool" >Bool</a>;
---functions---
<a href="/method/auth.bindTempAuthKey" class="current_page_link" >auth.bindTempAuthKey</a>#cdd42a05 perm_auth_key_id:<a href="/type/long" >long</a> nonce:<a href="/type/long" >long</a> expires_at:<a href="/type/int" >int</a> encrypted_message:<a href="/type/bytes" >bytes</a> = <a href="/type/Bool" >Bool</a>;</code></pre></p>
<h3><a class="anchor" href="#parameters" id="parameters" name="parameters"><i class="anchor-icon"></i></a>Parameters</h3>
<table class="table">
<thead>
<tr>
<th>Name</th>
<th style="text-align: center;">Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>perm_auth_key_id</strong></td>
<td style="text-align: center;"><a href="/type/long">long</a></td>
<td>Permanent auth_key_id to bind to</td>
</tr>
<tr>
<td><strong>nonce</strong></td>
<td style="text-align: center;"><a href="/type/long">long</a></td>
<td>Random long from <a href="#binding-message-contents">Binding message contents</a></td>
</tr>
<tr>
<td><strong>expires_at</strong></td>
<td style="text-align: center;"><a href="/type/int">int</a></td>
<td>Unix timestamp to invalidate temporary key, see <a href="#binding-message-contents">Binding message contents</a></td>
</tr>
<tr>
<td><strong>encrypted_message</strong></td>
<td style="text-align: center;"><a href="/type/bytes">bytes</a></td>
<td>See <a href="#generating-encrypted-message">Generating encrypted_message</a></td>
</tr>
</tbody>
</table>
<h3><a class="anchor" href="#result" id="result" name="result"><i class="anchor-icon"></i></a>Result</h3>
<p><a href="/type/Bool">Bool</a></p>
<h3><a class="anchor" href="#possible-errors" id="possible-errors" name="possible-errors"><i class="anchor-icon"></i></a>Possible errors</h3>
<table class="table">
<thead>
<tr>
<th>Code</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>400</td>
<td>ENCRYPTED_MESSAGE_INVALID</td>
<td>Encrypted message invalid.</td>
</tr>
<tr>
<td>400</td>
<td>TEMP_AUTH_KEY_ALREADY_BOUND</td>
<td>The passed temporary key is already bound to another <strong>perm_auth_key_id</strong>.</td>
</tr>
<tr>
<td>400</td>
<td>TEMP_AUTH_KEY_EMPTY</td>
<td>No temporary auth key provided.</td>
</tr>
</tbody>
</table>
<h3><a class="anchor" href="#generating-encrypted-message" id="generating-encrypted-message" name="generating-encrypted-message"><i class="anchor-icon"></i></a>Generating encrypted_message</h3>
<p>The client begins by creating a special binding message:</p>
<h3><a class="anchor" href="#binding-message-contents" id="binding-message-contents" name="binding-message-contents"><i class="anchor-icon"></i></a>Binding message contents</h3>
<pre><code>bind_auth_key_inner#75a3f765 nonce:long temp_auth_key_id:long perm_auth_key_id:long temp_session_id:long expires_at:int = BindAuthKeyInner;</code></pre>
<table class="table">
<thead>
<tr>
<th></th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>nonce</strong></td>
<td><a href="/type/long">long</a></td>
<td>Random long</td>
</tr>
<tr>
<td><strong>temp_auth_key_id</strong></td>
<td><a href="/type/long">long</a></td>
<td>Temporary auth_key_id</td>
</tr>
<tr>
<td><strong>perm_auth_key_id</strong></td>
<td><a href="/type/long">long</a></td>
<td>Permanent auth_key_id to bind to</td>
</tr>
<tr>
<td><strong>temp_session_id</strong></td>
<td><a href="/type/long">long</a></td>
<td>Session id, which will be used to invoke <strong>auth.bindTempAuthKey</strong> method</td>
</tr>
<tr>
<td><strong>expires_at</strong></td>
<td><a href="/type/int">int</a></td>
<td>Unix timestamp to invalidate temporary key</td>
</tr>
</tbody>
</table>
<h3><a class="anchor" href="#encrypting-the-binding-message" id="encrypting-the-binding-message" name="encrypting-the-binding-message"><i class="anchor-icon"></i></a>Encrypting the binding message</h3>
<p>This binding message is encrypted in <a href="/mtproto/description">the usual way, but with MTProto v1</a> using the <code>perm_auth_key</code>. In other words, one has to prepend <code>random:int128</code> (it replaces the customary <code>session_id:long</code> and <code>salt:long</code> that are irrelevant in this case), then append the same <code>msg_id</code> that will be used for the request, a <code>seqno</code> equal to zero, and the correct <code>msg_len</code> (40 bytes in this case); after that, one computes the <code>msg_key:int128</code> as SHA1 of the resulting string, appends padding necessary for a 16-byte alignment, encrypts the resulting string using the key derived from <code>perm_auth_key</code> and <code>msg_key</code>, and prepends <code>perm_auth_key_id</code> and <code>msg_key</code> to the encrypted data as usual.</p>
<h3><a class="anchor" href="#binding" id="binding" name="binding"><i class="anchor-icon"></i></a>Binding</h3>
<p>Once <strong>encrypted_message</strong> is ready, an <strong>auth.bindTempAuthKey</strong> request is sent to the server using <code>temp_auth_key</code> and <code>temp_session_id</code>. Don't forget to <a href="/api/invoking#saving-client-info">rewrite client info</a> using <a href="/method/initConnection">initConnection</a> when the binding is completed.</p>
<h3><a class="anchor" href="#bots-can-use-this-method" id="bots-can-use-this-method" name="bots-can-use-this-method"><i class="anchor-icon"></i></a>Bots can use this method</h3>
<h3><a class="anchor" href="#related-pages" id="related-pages" name="related-pages"><i class="anchor-icon"></i></a>Related pages</h3>
<h4><a class="anchor" href="#perfect-forward-secrecy" id="perfect-forward-secrecy" name="perfect-forward-secrecy"><i class="anchor-icon"></i></a><a href="/api/pfs">Perfect Forward Secrecy</a></h4>
<p>Binding temporary authorization key to permanent ones.</p>
<h4><a class="anchor" href="#long" id="long" name="long"><i class="anchor-icon"></i></a><a href="/type/long">long</a></h4>
<p>A basic bare type, elements of which correspond to two-element sequences, representing 64-bit signed numbers (little-endian).</p>
<p><a href="/mtproto/serialize">More on basic types »</a></p>
<h4><a class="anchor" href="#int" id="int" name="int"><i class="anchor-icon"></i></a><a href="/type/int">int</a></h4>
<p>A basic bare type, the values of which correspond to single-element sequences, i.e. numbers from -2^31 to 2^31-1 which in this case represent themselves.</p>
<p><a href="/mtproto/serialize">More on basic types »</a></p>
<h4><a class="anchor" href="#mobile-protocol-detailed-description" id="mobile-protocol-detailed-description" name="mobile-protocol-detailed-description"><i class="anchor-icon"></i></a><a href="/mtproto/description">Mobile Protocol: Detailed Description</a></h4>
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<p>Additional options for calling methods.</p>
<h4><a class="anchor" href="#initconnection" id="initconnection" name="initconnection"><i class="anchor-icon"></i></a><a href="/method/initConnection">initConnection</a></h4>
<p>Initialize connection</p></div>
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