MadelineProtoDocs/old_docs/API_docs_v91/constructors/passwordKdfAlgoUnknown.md

---
title: passwordKdfAlgoUnknown
description: Unknown KDF (most likely, the client is outdated and does not support the specified KDF algorithm)
image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
---
# Constructor: passwordKdfAlgoUnknown  
[Back to constructors index](index.md)



Unknown KDF (most likely, the client is outdated and does not support the specified KDF algorithm)




### Type: [PasswordKdfAlgo](../types/PasswordKdfAlgo.md)


### Example:

```php
$passwordKdfAlgoUnknown = ['_' => 'passwordKdfAlgoUnknown'];
```  


Or, if you're into Lua:

```lua
passwordKdfAlgoUnknown={_='passwordKdfAlgoUnknown'}

```