<!DOCTYPE html> <html class=""> <head> <meta charset="utf-8"> <title>auth.bindTempAuthKey</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <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."> <meta property="og:title" content="auth.bindTempAuthKey"> <meta property="og:image" content=""> <meta property="og:description" content="Binds a temporary authorization key temp_auth_key_id to the permanent authorization key perm_auth_key_id. 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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> <p><div class="clearfix"> <ul class="dev_layer_select slightly-pull-right nav nav-pills"> <li class="dropdown"> <a class="dropdown-toggle" onclick="return dropdownClick(this, event)" href="#">Layer 170 <b class="caret"></b></a> <ul class="dropdown-menu"> <li><a href="?layer=1">1 – Base layer</a></li><li><a href="?layer=2">2 – New userpic notifications</a></li><li><a href="?layer=3">3 – Send message can trigger link change</a></li><li><a href="?layer=4">4 – Check-in chats</a></li><li><a href="?layer=5">5 – Localized SMS, localized notifications</a></li><li><a href="?layer=6">6 – Foursquare integration</a></li><li><a href="?layer=7">7 – Added wallPaperSolid</a></li><li><a href="?layer=8">8 – Added end-to-end encryption</a></li><li><a href="?layer=9">9 – Improved big files upload perfomance</a></li><li><a href="?layer=10">10 – Improved chat participants updates</a></li><li><a href="?layer=11">11 – Improved secret chats</a></li><li><a href="?layer=12">12 – New dynamic support</a></li><li><a href="?layer=13">13 – Audio, video MIME; 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<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> <h4><a class="anchor" href="#calling-api-methods" id="calling-api-methods" name="calling-api-methods"><i class="anchor-icon"></i></a><a href="/api/invoking">Calling API Methods</a></h4> <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> </div> </div> </div> <div class="footer_wrap"> <div class="footer_columns_wrap footer_desktop"> <div class="footer_column footer_column_telegram"> <h5>Telegram</h5> <div class="footer_telegram_description"></div> Telegram is a cloud-based mobile and desktop messaging app with a focus on security and speed. </div> <div class="footer_column"> <h5><a href="//telegram.org/faq">About</a></h5> <ul> <li><a href="//telegram.org/faq">FAQ</a></li> <li><a href="//telegram.org/privacy">Privacy</a></li> <li><a href="//telegram.org/press">Press</a></li> </ul> </div> <div class="footer_column"> <h5><a href="//telegram.org/apps#mobile-apps">Mobile Apps</a></h5> <ul> <li><a href="//telegram.org/dl/ios">iPhone/iPad</a></li> <li><a href="//telegram.org/android">Android</a></li> <li><a href="//telegram.org/dl/web">Mobile Web</a></li> </ul> </div> <div class="footer_column"> <h5><a href="//telegram.org/apps#desktop-apps">Desktop Apps</a></h5> <ul> <li><a href="//desktop.telegram.org/">PC/Mac/Linux</a></li> <li><a href="//macos.telegram.org/">macOS</a></li> <li><a href="//telegram.org/dl/web">Web-browser</a></li> </ul> </div> <div class="footer_column footer_column_platform"> <h5><a href="/">Platform</a></h5> <ul> <li><a href="/api">API</a></li> <li><a href="//translations.telegram.org/">Translations</a></li> <li><a href="//instantview.telegram.org/">Instant View</a></li> </ul> </div> </div> <div class="footer_columns_wrap footer_mobile"> <div class="footer_column"> <h5><a href="//telegram.org/faq">About</a></h5> </div> <div class="footer_column"> <h5><a href="//telegram.org/blog">Blog</a></h5> </div> <div class="footer_column"> <h5><a href="//telegram.org/apps">Apps</a></h5> </div> <div class="footer_column"> <h5><a href="/">Platform</a></h5> </div> <div class="footer_column"> <h5><a href="//telegram.org/press">Press</a></h5> </div> </div> </div> </div> <script src="/js/main.js?47"></script> <script>backToTopInit("Go up"); removePreloadInit(); </script> </body> </html>