Index: lang/en/auth_db.php
===================================================================
--- lang/en/auth_db.php	(wersja 4)
+++ lang/en/auth_db.php	(kopia robocza)
@@ -70,3 +70,9 @@
 $string['auth_dbuserstoremove'] = 'User entries to remove: {$a}';
 $string['pluginname'] = 'External database';
 $string['privacy:metadata'] = 'The External database authentication plugin does not store any personal data.';
+$string['passlibhandlers'] = 'Passlib crypt handlers';
+$string['passlibhandlerhelp'] = '<p>Using \'Passlib crypt handlers\' requires python-passlib libraries installed on the server along with python binary itself and pathtopyton moodle variable set properly. See Passlib documentation for more explanation.</p>';
+$string['pathtopythonnotset'] = 'Path to python not set!';
+$string['pythonpipeerror'] = 'Python pipe error!';
+$string['pythonexecerror'] = 'Python code execute error!';
+
Index: auth.php
===================================================================
--- auth.php	(wersja 4)
+++ auth.php	(kopia robocza)
@@ -138,7 +138,9 @@
                 return (strtolower($fromdb) == sha1($extpassword));
             } else if ($this->config->passtype === 'saltedcrypt') {
                 return password_verify($extpassword, $fromdb);
-            } else {
+            } else if (strpos($this->config->passtype, 'passlib:') === 0) {
+                return $this->passlib_verify($extpassword, $fromdb);
+         } else {
                 return false;
             }
 
@@ -146,6 +148,79 @@
     }
 
     /**
+     * Execude python code using configured pathtopython
+     *
+     * @param string $code
+     * @return string
+     * @throws moodle_exception
+     */
+    public static function python_exec($code)  {
+        global $CFG;
+        if(empty($CFG->pathtopython)) {
+            throw new moodle_exception('pathtopythonnotset', 'auth_db');
+        }
+
+        $proc = proc_open(
+            $CFG->pathtopython,
+            [['pipe', 'r'], ['pipe', 'w'], ['pipe', 'w']],
+            $pipes
+        );
+        if(!is_resource($proc)) { 
+            throw new moodle_exception('pythonpipeerror', 'auth_db');
+        }
+
+        fwrite($pipes[0], $code);
+        fclose($pipes[0]);
+        $stdout = stream_get_contents($pipes[1]);
+        fclose($pipes[1]);
+        $stderr = stream_get_contents($pipes[2]);
+        fclose($pipes[2]);
+
+        $exitcode = proc_close($proc);
+
+        if($exitcode != 0) {
+            debugging($stdout."\n".$stderr."\n");
+            throw new moodle_exception('pythonexecerror', 'auth_db');
+        }
+        return trim($stdout);
+    }
+
+    /**
+     * Verify password using Passlib 
+     *
+     * @param string $password
+     * @param string $hash
+     * @return bool
+     * @throws moodle_exception
+     */
+    function passlib_verify($password, $hash) {
+        $passlibhandler = substr(
+            $this->config->passtype, 
+            strpos($this->config->passtype, ':') + 1
+        );
+        $password = addslashes($password);
+        $hash = addslashes($hash);
+        $code = <<<EOT
+from passlib.handlers.pbkdf2 import $passlibhandler
+print($passlibhandler.verify("$password", "$hash"))
+EOT;
+        return self::python_exec($code) === 'True' ? true : false; 
+}
+    
+    /**
+     * List all Passlib crypt handlers
+     *
+     * @return array
+     */
+    public static function passlib_list_crypt_handlers() {
+        return explode(',', preg_replace('/[\[\]\'\ ]/', '', self::python_exec(<<<EOT
+from passlib.registry import list_crypt_handlers
+print(list_crypt_handlers())
+EOT
+        )));
+    }
+
+    /**
      * Connect to external database.
      *
      * @return ADOConnection
Index: settings.php
===================================================================
--- settings.php	(wersja 4)
+++ settings.php	(kopia robocza)
@@ -96,8 +96,17 @@
     $passtype["saltedcrypt"] = get_string("auth_dbsaltedcrypt", "auth_db");
     $passtype["internal"]    = get_string("internal", "auth");
 
+    $passtype[''] = '--- '.get_string("passlibhandlers", "auth_db").' ---';
+
+    require_once($CFG->dirroot.'/auth/db/auth.php');
+    try {
+        foreach (auth_plugin_db::passlib_list_crypt_handlers() as $passlibhandler) {
+            $passtype['passlib:'.$passlibhandler] = $passlibhandler;
+        }
+    } catch(moodle_exception $e) {}
+
     $settings->add(new admin_setting_configselect('auth_db/passtype',
-        new lang_string('auth_dbpasstype_key', 'auth_db'), new lang_string('auth_dbpasstype', 'auth_db'), 'plaintext', $passtype));
+        new lang_string('auth_dbpasstype_key', 'auth_db'), new lang_string('auth_dbpasstype', 'auth_db').new lang_string('passlibhandlerhelp', 'auth_db'), 'plaintext', $passtype));
 
     // Encoding.
     $settings->add(new admin_setting_configtext('auth_db/extencoding', get_string('auth_dbextencoding', 'auth_db'),