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<meta property="description" content="Binds a temporary authorization key temp_auth_key_id to the permanent authorization key perm_auth_key_id. Each permanent key may only be bound to one temporary key at a time, binding a new temporary key overwrites the previous one.">
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<meta property="og:description" content="Binds a temporary authorization key temp_auth_key_id to the permanent authorization key perm_auth_key_id. Each permanent key may only be bound to one temporary key at a time, binding a new temporary key overwrites the previous one.">
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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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<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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