> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/ios/digital-signature/digital-signature-validation.md).

# Digital Signature Validation on iOS

Validate signatures in signed documents by verifying signers using PTDigitalSignaturesViewController. Learn how to add a trusted certificate and validate digital signatures effectively. The Apryse iOS

You can validate signatures in signed documents by verifying signers using the `PTDigitalSignaturesViewController`.

![](https://4149080208-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgY6xtY9ZQd9XMpvWlGM0%2Fuploads%2Fgit-blob-b93a77c03bc9e14debd091e2d5b3340a24c7ad38%2F874263f2de0111668ed09c3ef6bbf95e2862d310-1170x2532.png?alt=media)

## Adding a trusted certificate

Before you can verify signatures in \`PTDigitalSignaturesViewController\`, you will need to specify the path to your self-signed certificate via the \`PTToolManager\`'s \`digitalSignaturesManager\`: \`toolManager.digitalSignaturesManager.rootCertificateFilePath = \`

## Validating digital signatures

To verify your digital signatures, you can show the `DigitalSignatureListDialog` using the code below:

{% tabs %}
{% tab title="Obj-C" %}
{% code lineNumbers="true" %}

```objc
-(void)showDigitalSignatureListWithToolManager:(PTToolManager*)toolManager
{
    // toolManager must have a reference to the root certificate as described above
    PTDigitalSignaturesViewController *digitalSignaturesViewController = [[PTDigitalSignaturesViewController allocOverridden] initWithToolManager:toolManager];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:digitalSignaturesViewController];
    [self presentViewController:navigationController animated:YES completion:nil];
}
```

{% endcode %}
{% endtab %}

{% tab title="Swift" %}
{% code lineNumbers="true" %}

```swift
func showDigitalSignatureList(with toolManager:PTToolManager)
{
    let digitalSignaturesViewController = PTDigitalSignaturesViewController(toolManager: toolManager)
    let navigationController = UINavigationController(rootViewController: digitalSignaturesViewController)
    documentController.present(navigationController, animated: true, completion: nil)
}
```

{% endcode %}
{% endtab %}
{% endtabs %}

{% tabs %}
{% tab title="Obj-C" %}
{% code lineNumbers="true" %}

```objc
-(void)showDigitalSignatureListWithToolManager:(PTToolManager*)toolManager
{
    // toolManager must have a reference to the root certificate as described above
    PTDigitalSignaturesViewController *digitalSignaturesViewController = [[PTDigitalSignaturesViewController allocOverridden] initWithToolManager:toolManager];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:digitalSignaturesViewController];
    [self presentViewController:navigationController animated:YES completion:nil];
}
```

{% endcode %}
{% endtab %}
{% endtabs %}

In this list, you will be able to view digital signature information such as the signer's name, time of signing, signature validity, etc. Additionally you can tap on Signature Properties to view additional signature details.

![](https://4149080208-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgY6xtY9ZQd9XMpvWlGM0%2Fuploads%2Fgit-blob-f37fb31f4bad936ae8ba22e124467e35366508fd%2F3504128fec7e7fa8630653470d86b972288616e7-1170x2532.png?alt=media)


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