# SHA1 replaced with SHA256 for the Storefront SSO feature

{% hint style="danger" %}
**Breaking changes!**\
Сhanges listed below may break some apps' logic.
{% endhint %}

#### What's new

The encryption mechanism for SSO was updated from SHA1 to SHA256 for security enhancement.

{% content-ref url="/spaces/G9n5VxMY9T0Ob3D56PSD/pages/beXS323AibMJ1lg7UkOH" %}
[SSO (Single-Sign-On) for websites](/api-reference/rest-api/storefront-widget-details/sso-single-sign-on-for-websites.md)
{% endcontent-ref %}

#### Changes in API

Payload signing now uses sha256. Code example on PHP:

```php
<?php
    $client_secret = "A1Lu7ANIhKD6A1Lu7ANIhKD6ADsaSdsa"; // example value
    $message = base64_encode("{appClientId: 'my-cool-app', userId:'234', profile: { email:'test@example.com', billingPerson: { name: 'John Doe' } }}"); // example values
    $timestamp = time();
    $hmac = hash_hmac('sha256', "$message $timestamp", $client_secret);
​
    echo "<script> var ecwid_sso_profile = '$message $hmac $timestamp'; </script>";
?>
```

#### Why the changes are breaking

The SHA1 encryption is now discontinued. If the encryption mechanism isn't updated in the code, the SSO will stop working.

#### How to update the app

1. Check if your app uses SSO on the website.
2. Check the code to find the `hash_hmac()` encryption.
3. Update the `'sha1'` with `'sha256'` inside the `hash_hmac()`  method.


---

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