MadelineProtoDocs/old_docs/API_docs_v25/constructors/cdnPublicKey.md

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2020-06-16 17:50:25 +02:00
---
title: cdnPublicKey
description: Public key to use **only** during handshakes to [CDN](https://core.telegram.org/cdn) DCs.
image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
---
# Constructor: cdnPublicKey
[Back to constructors index](index.md)
Public key to use **only** during handshakes to [CDN](https://core.telegram.org/cdn) DCs.
### Attributes:
| Name | Type | Required | Description |
|----------|---------------|----------|-------------|
|dc\_id|[int](../types/int.md) | Yes|[CDN DC](https://core.telegram.org/cdn) ID|
|public\_key|[string](../types/string.md) | Yes|RSA public key|
### Type: [CdnPublicKey](../types/CdnPublicKey.md)
### Example:
```php
$cdnPublicKey = ['_' => 'cdnPublicKey', 'dc_id' => int, 'public_key' => 'string'];
```
Or, if you're into Lua:
```lua
cdnPublicKey={_='cdnPublicKey', dc_id=int, public_key='string'}
```