Qualification algorithm: beginnings

MatthiasValvekens · Dec 12, 2023 · a66f596 · a66f596
1 parent 83b2515
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diff --git a/pyhanko/sign/ades/qualified_asn1.py b/pyhanko/sign/ades/qualified_asn1.py
@@ -1,4 +1,4 @@
-from asn1crypto import core
+from asn1crypto import core, x509
 
 from pyhanko.sign.ades.asn1_util import register_x509_extension
 
@@ -93,4 +93,14 @@ class QcStatements(core.SequenceOf):
     _child_spec = QcStatement
 
 
+def get_qc_statements(cert: x509.Certificate) -> QcStatements:
+    for ext in cert['tbs_certificate']['extensions']:
+        if ext['extn_id'].native != 'qc_statements':
+            continue
+        qc_statements: QcStatements = ext['extn_value'].parsed
+        return qc_statements
+    else:
+        return QcStatements()
+
+
 register_x509_extension('1.3.6.1.5.5.7.1.3', 'qc_statements', QcStatements)