Fix

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>

Author: solracsf

lib/Updater.php

@@ -744,17 +744,20 @@ public function verifyIntegrity(): void {
 			throw new \Exception('Failed to open downloaded file for integrity check');
 		}
 
-		$hash = hash_init('sha512');
+		$data = '';
 		while (!feof($fh)) {
 			$chunk = fread($fh, 8192);
-			hash_update($hash, $chunk);
+			if ($chunk === false) {
+				fclose($fh);
+				throw new \Exception('Error reading file during integrity check');
+			}
+			$data .= $chunk;
 		}
 		fclose($fh);
-		$fileHash = hash_final($hash, true);
 
 		$signature = base64_decode($response['signature']);
 
-		$validSignature = openssl_verify($fileHash, $signature, $certificate, OPENSSL_ALGO_SHA512);
+		$validSignature = openssl_verify($data, $signature, $certificate, OPENSSL_ALGO_SHA512);
 		if ($validSignature !== 1) {
 			throw new \Exception('Signature of update is not valid');
 		}