From a5dcf644a98256063f520250f86df2b4c9d2ec29 Mon Sep 17 00:00:00 2001
From: Matthias Valvekens <matthias@mvalvekens.be>
Date: Tue, 24 Oct 2023 01:09:30 +0200
Subject: [PATCH] Correct definition of PdfMacIntegrityInfo

---
 pyhanko/pdf_utils/crypt/_iso32004_asn1.py | 2 +-
 pyhanko/pdf_utils/crypt/pdfmac.py         | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/pyhanko/pdf_utils/crypt/_iso32004_asn1.py b/pyhanko/pdf_utils/crypt/_iso32004_asn1.py
index b7c94abc..d861f913 100644
--- a/pyhanko/pdf_utils/crypt/_iso32004_asn1.py
+++ b/pyhanko/pdf_utils/crypt/_iso32004_asn1.py
@@ -12,7 +12,7 @@
 
 class PdfMacIntegrityInfo(Sequence):
     _fields = [
-        ('version', Integer, {'default': 0}),
+        ('version', Integer),
         ('data_digest', OctetString),
         ('signature_digest', OctetString, {'implicit': 0, 'optional': True}),
     ]
diff --git a/pyhanko/pdf_utils/crypt/pdfmac.py b/pyhanko/pdf_utils/crypt/pdfmac.py
index 63c0fc89..4dec38c0 100644
--- a/pyhanko/pdf_utils/crypt/pdfmac.py
+++ b/pyhanko/pdf_utils/crypt/pdfmac.py
@@ -1,7 +1,7 @@
 import os
 import secrets
 from hmac import compare_digest
-from typing import FrozenSet, Optional, Tuple, Type
+from typing import Any, Dict, FrozenSet, Optional, Tuple, Type
 
 from asn1crypto import algos, cms, core
 from asn1crypto.core import VOID
@@ -210,9 +210,10 @@ def _get_mac_keying_info(
     def _format_message(
         self, document_digest: bytes, signature_digest: Optional[bytes]
     ) -> Tuple[bytes, bytes]:
-        message_kwargs = {'data_digest': document_digest}
+        message_kwargs: Dict[str, Any] = {'data_digest': document_digest}
         if signature_digest is not None:
             message_kwargs['signature_digest'] = signature_digest
+        message_kwargs['version'] = 0
 
         message = PdfMacIntegrityInfo(message_kwargs)
         message_bytes = message.dump()