> 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/android/digital-signature/digital-signature-validation.md).

# Validate Digital Signatures in Android

Learn how to validate signatures in signed documents using the DigitalSignatureListDialog. Add trusted certificates and verify digital signatures easily. The Apryse Android SDK streamlines secure docu

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

![](https://226546913-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0QItsdFBmuuL9ezHimHy%2Fuploads%2Fgit-blob-c5131450d884f5dd9972c73495838c4730f5596f%2Fede1ed768e2d07587b011abfba763b08d9dc03f4-540x960.png?alt=media)

## Adding a trusted certificate

Before you can verify signatures in \`DigitalSignatureListDialog\`, you will need to add your self-signed certificate to the store of trusted certificates using the \`DigitalSignatureUtils.addCertificate(Context, File)\` method. Certificates added this way will be stored internally and referenced by \`DigitalSignatureListDialog\` when validating your signatures.

## Validating digital signatures

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

{% tabs %}
{% tab title="Java" %}
{% code lineNumbers="true" %}

```java
private static void showDigitalSignatureList(ToolManager toolManager, PDFViewCtrl pdfViewCtrl, FragmentManager fragmentManager) {
    DigitalSignatureListDialog dialog = DigitalSignatureListDialog.newInstance();
    dialog.setStyle(DialogFragment.STYLE_NO_TITLE, toolManager.getTheme());
    dialog.setPDFViewCtrl(pdfViewCtrl);
    dialog.show(fragmentManager, "digital_sig_list_dialog");
}
```

{% endcode %}
{% endtab %}

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

```kotlin
private static void showDigitalSignatureList(ToolManager toolManager, PDFViewCtrl pdfViewCtrl, FragmentManager fragmentManager) {
    DigitalSignatureListDialog dialog = DigitalSignatureListDialog.newInstance();
    dialog.setStyle(DialogFragment.STYLE_NO_TITLE, toolManager.getTheme());
    dialog.setPDFViewCtrl(pdfViewCtrl);
    dialog.show(fragmentManager, "digital_sig_list_dialog");
}
```

{% 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://226546913-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0QItsdFBmuuL9ezHimHy%2Fuploads%2Fgit-blob-d15d26015c1cd21e63495da45e38af36327dea5b%2Ff97e59316fd35a3300fc5249e14af5e86311397c-540x960.png?alt=media)


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