# Method: auth.bindTempAuthKey

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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.

For more information, see Perfect Forward Secrecy.

# Parameters:

Name Type Description Required
perm_auth_key_id long Permanent auth_key_id to bind to Yes
nonce long Random long from Binding message contents Yes
expires_at int Unix timestamp to invalidate temporary key, see Binding message contents Yes
encrypted_message bytes See Generating encrypted_message Yes

# Return type: Bool

# Can bots use this method: YES

# MadelineProto Example (now async for huge speed and parallelism!):

if (!file_exists('madeline.php')) {
    copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';

$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();

$Bool = $MadelineProto->auth->bindTempAuthKey(['perm_auth_key_id' => long, 'nonce' => long, 'expires_at' => int, 'encrypted_message' => 'bytes', ]);

Or, if you’re into Lua:

Bool = auth.bindTempAuthKey({perm_auth_key_id=long, nonce=long, expires_at=int, encrypted_message='bytes', })

# Errors

Code Type Description
400 ENCRYPTED_MESSAGE_INVALID Encrypted message invalid
400 INPUT_REQUEST_TOO_LONG The request is too big
400 TEMP_AUTH_KEY_EMPTY No temporary auth key provided
-503 Timeout Timeout while fetching data
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