fix: Correctly check result of function

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

lib/private/Installer.php

@@ -297,7 +297,7 @@ public function downloadApp($appId, $allowUnstable = false) {
 
 				// Check if the signature actually matches the downloaded content
 				$certificate = openssl_get_publickey($app['certificate']);
-				$verified = (bool)openssl_verify(file_get_contents($tempFile), base64_decode($app['releases'][0]['signature']), $certificate, OPENSSL_ALGO_SHA512);
+				$verified = openssl_verify(file_get_contents($tempFile), base64_decode($app['releases'][0]['signature']), $certificate, OPENSSL_ALGO_SHA512) === 1;
 				// PHP 8+ deprecates openssl_free_key and automatically destroys the key instance when it goes out of scope
 				if ((PHP_VERSION_ID < 80000)) {
 					openssl_free_key($certificate);

lib/private/Security/IdentityProof/Signer.php

@@ -93,12 +93,12 @@ public function verify(array $data): bool {
 			$user = $this->userManager->get($userId);
 			if ($user !== null) {
 				$key = $this->keyManager->getKey($user);
-				return (bool)openssl_verify(
+				return openssl_verify(
 					json_encode($data['message']),
 					base64_decode($data['signature']),
 					$key->getPublic(),
 					OPENSSL_ALGO_SHA512
-				);
+				) === 1;
 			}
 		}