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.venv/Lib/site-packages/joserfc/_rfc7797/util.py

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+from ..registry import Header
+from ..errors import MissingCritHeaderError
+
+
+def is_rfc7797_enabled(header: Header) -> bool:
+    if "b64" not in header:
+        return False
+
+    if header["b64"] is True:
+        return False
+
+    # https://datatracker.ietf.org/doc/html/rfc7797#section-6
+    crit = header.get("crit")
+    if isinstance(crit, list) and "b64" in crit:
+        return True
+
+    raise MissingCritHeaderError("b64")