From 403f44b32ad3fb92c293894ae5cdfea28be64103 Mon Sep 17 00:00:00 2001
From: Tilman Hausherr <tilman@apache.org>
Date: Fri, 9 Aug 2024 15:37:48 +0000
Subject: [PATCH] PDFBOX-5866: also truncate the O and U entries, as suggested
 by Michael Klink

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1919783 13f79535-47bb-0310-9956-ffa450edef68
---
 .../pdmodel/encryption/PDEncryption.java       | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/PDEncryption.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/PDEncryption.java
index 3a3c0a3d3a0..d356b20633e 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/PDEncryption.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/PDEncryption.java
@@ -277,6 +277,15 @@ public byte[] getOwnerKey() throws IOException
         if( owner != null )
         {
             o = owner.getBytes();
+            int r = getRevision();
+            if (r <= 4)
+            {
+                o = Arrays.copyOf(o, 32);
+            }
+            else if (r == 6)
+            {
+                o = Arrays.copyOf(o, 48);
+            }
         }
         return o;
     }
@@ -307,6 +316,15 @@ public byte[] getUserKey() throws IOException
         if( user != null )
         {
             u = user.getBytes();
+            int r = getRevision();
+            if (r <= 4)
+            {
+                u = Arrays.copyOf(u, 32);
+            }
+            else if (r == 6)
+            {
+                u = Arrays.copyOf(u, 48);
+            }
         }
         return u;
     }