EnricoMi commented on code in PR #47339:
URL: https://github.com/apache/arrow/pull/47339#discussion_r2290201443


##########
python/pyarrow/_parquet_encryption.pyx:
##########
@@ -300,20 +306,29 @@ cdef class KmsConnectionConfig(_Weakrefable):
 
 # Callback definitions for CPyKmsClientVtable
 cdef void _cb_wrap_key(
-        handler, const c_string& key_bytes,
+        handler, const CSecureString& key,
         const c_string& master_key_identifier, c_string* out) except *:
+    cdef:
+        cpp_string_view view = key.as_view()
+    key_bytes = PyObject_to_object(
+        PyBytes_FromStringAndSizeNative(view.data(), view.size()))

Review Comment:
   Yes, I deliberately left this piece of work for a separate PR.
   
   Happy to see this as "Likelihood: unlikely, Remediation Cost: expensive to 
repair" as well.



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