From a0c58aad2c718ed58a13f06d954f058079e61752 Mon Sep 17 00:00:00 2001
From: Sucukdeluxe <Sucukdeluxe@users.noreply.github.com>
Date: Sun, 1 Mar 2026 02:03:37 +0100
Subject: [PATCH] Release v1.4.36 with tolerant DLC padding

- Local DLC decryption no longer throws on invalid PKCS7 padding
- Instead tries to parse the decrypted data as-is (Node.js base64
  decoder is lenient with trailing garbage bytes)
- This fixes large DLCs that previously failed locally and then
  hit dcrypt.it's 413 size limit on both endpoints
- Empty decryption result returns [] instead of throwing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 package.json          |  2 +-
 src/main/container.ts | 19 +++++++++++--------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/package.json b/package.json
index 7fc1eac..bccb8cc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "real-debrid-downloader",
-  "version": "1.4.35",
+  "version": "1.4.36",
   "description": "Real-Debrid Downloader Desktop (Electron + React + TypeScript)",
   "main": "build/main/main/main.js",
   "author": "Sucukdeluxe",
diff --git a/src/main/container.ts b/src/main/container.ts
index 6549ee5..2027134 100644
--- a/src/main/container.ts
+++ b/src/main/container.ts
@@ -145,18 +145,21 @@ async function decryptDlcLocal(filePath: string): Promise<ParsedPackageInput[]>
   let decrypted = Buffer.concat([decipher.update(encrypted), decipher.final()]);
 
   if (decrypted.length === 0) {
-    throw new Error("DLC-Entschlüsselung lieferte keine Daten");
+    return [];
   }
   const pad = decrypted[decrypted.length - 1];
-  if (pad <= 0 || pad > 16 || pad > decrypted.length) {
-    throw new Error("Ungültiges DLC-Padding");
-  }
-  for (let index = 1; index <= pad; index += 1) {
-    if (decrypted[decrypted.length - index] !== pad) {
-      throw new Error("Ungültiges DLC-Padding");
+  if (pad > 0 && pad <= 16 && pad <= decrypted.length) {
+    let validPad = true;
+    for (let index = 1; index <= pad; index += 1) {
+      if (decrypted[decrypted.length - index] !== pad) {
+        validPad = false;
+        break;
+      }
+    }
+    if (validPad) {
+      decrypted = decrypted.subarray(0, decrypted.length - pad);
     }
   }
-  decrypted = decrypted.subarray(0, decrypted.length - pad);
 
   const xmlData = Buffer.from(decrypted.toString("utf8"), "base64").toString("utf8");
   return parsePackagesFromDlcXml(xmlData);