diff --git a/lib/Handler/ISignEngineHandler.php b/lib/Handler/ISignEngineHandler.php
index 5b69794a78..4c77a35d6b 100644
--- a/lib/Handler/ISignEngineHandler.php
+++ b/lib/Handler/ISignEngineHandler.php
@@ -17,10 +17,6 @@ public function setCertificate(string $certificate): self;
 	public function getCertificate(): string;
 	public function setPassword(string $password): self;
 	public function getPassword(): string;
-	/**
-	 * Sign a file
-	 *
-	 * @return string|\OCP\Files\Node string of signed file or Node of signed file
-	 */
-	public function sign();
+	public function sign(): File;
+	public function getSignedContent(): string;
 }
diff --git a/lib/Handler/JSignPdfHandler.php b/lib/Handler/JSignPdfHandler.php
index d6d8fd3c1f..a68dc25fcf 100644
--- a/lib/Handler/JSignPdfHandler.php
+++ b/lib/Handler/JSignPdfHandler.php
@@ -13,6 +13,7 @@
 use OCA\Libresign\AppInfo\Application;
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Service\Install\InstallService;
+use OCP\Files\File;
 use OCP\IAppConfig;
 use Psr\Log\LoggerInterface;
 
@@ -92,10 +93,13 @@ private function getHashAlgorithm(): string {
 		return 'SHA256';
 	}
 
-	/**
-	 * @psalm-suppress MixedReturnStatement
-	 */
-	public function sign(): string {
+	public function sign(): File {
+		$signedContent = $this->getSignedContent();
+		$this->getInputFile()->putContent($signedContent);
+		return $this->getInputFile();
+	}
+
+	public function getSignedContent(): string {
 		$param = $this->getJSignParam()
 			->setCertificate($this->getCertificate())
 			->setPdf($this->getInputFile()->getContent())
diff --git a/lib/Handler/Pkcs12Handler.php b/lib/Handler/Pkcs12Handler.php
index 35c28dd3e6..2557781f7b 100644
--- a/lib/Handler/Pkcs12Handler.php
+++ b/lib/Handler/Pkcs12Handler.php
@@ -423,7 +423,7 @@ public function sign(): File {
 			->setInputFile($this->getInputFile())
 			->setPassword($this->getPassword())
 			->setVisibleElements($this->getVisibleElements())
-			->sign();
+			->getSignedContent();
 		$this->getInputFile()->putContent($signedContent);
 		return $this->getInputFile();
 	}
diff --git a/lib/Handler/Pkcs7Handler.php b/lib/Handler/Pkcs7Handler.php
index 32df18b2ba..6c8f9bb9d0 100644
--- a/lib/Handler/Pkcs7Handler.php
+++ b/lib/Handler/Pkcs7Handler.php
@@ -9,19 +9,11 @@
 namespace OCA\Libresign\Handler;
 
 use OCP\Files\File;
-use OCP\Files\Node;
 
 /**
  * @codeCoverageIgnore
  */
 class Pkcs7Handler extends SignEngineHandler {
-	/**
-	 * @psalm-suppress MixedReturnStatement
-	 *
-	 * @param Node $fileToSign
-	 * @param Node $certificate
-	 * @param string $passphrase
-	 */
 	public function sign(): File {
 		$p7sFile = $this->getP7sFile();
 		openssl_pkcs12_read($this->getCertificate(), $certificateData, $this->getPassword());
@@ -36,6 +28,10 @@ public function sign(): File {
 		return $p7sFile;
 	}
 
+	public function getSignedContent(): string {
+		return $this->sign()->getContent();
+	}
+
 	public function getP7sFile(): File {
 		$newName = $this->getInputFile()->getName() . '.p7s';
 		$p7sFile = $this->getInputFile()
diff --git a/lib/Handler/SignEngineHandler.php b/lib/Handler/SignEngineHandler.php
index 0897107f41..2ef6b13402 100644
--- a/lib/Handler/SignEngineHandler.php
+++ b/lib/Handler/SignEngineHandler.php
@@ -66,4 +66,8 @@ public function setVisibleElements(array $visibleElements): self {
 	public function getVisibleElements(): array {
 		return $this->visibleElements;
 	}
+
+	public function getSignedContent(): string {
+		return $this->sign()->getContent();
+	}
 }
diff --git a/tests/Unit/Handler/JSignPdfHandlerTest.php b/tests/Unit/Handler/JSignPdfHandlerTest.php
index 496d6a5ad7..17efc08adc 100644
--- a/tests/Unit/Handler/JSignPdfHandlerTest.php
+++ b/tests/Unit/Handler/JSignPdfHandlerTest.php
@@ -38,7 +38,7 @@ public function testSignExistingFileSuccess():void {
 		$this->class->setInputFile($inputFile);
 		$this->class->setCertificate('');
 		$this->class->setPassword('password');
-		$actual = $this->class->sign();
+		$actual = $this->class->getSignedContent();
 		$this->assertEquals('content', $actual);
 	}
 }