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-rw-r--r--python/olm/group_session.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/python/olm/group_session.py b/python/olm/group_session.py
index 814ce27..737d9ef 100644
--- a/python/olm/group_session.py
+++ b/python/olm/group_session.py
@@ -283,7 +283,12 @@ class InboundGroupSession(object):
message_index
)
self._check_error(ret)
- return bytes_to_native_str(ffi.unpack(export_buffer, export_length))
+ export_str = bytes_to_native_str(ffi.unpack(export_buffer, export_length))
+
+ # clear out copies of the key
+ lib.memset(export_buffer, 0, export_length)
+
+ return export_str
@classmethod
def import_session(cls, session_key):
@@ -313,6 +318,7 @@ class InboundGroupSession(object):
)
obj._check_error(ret)
finally:
+ # clear out copies of the key
if byte_session_key is not session_key:
for i in range(0, len(byte_session_key)):
byte_session_key[i] = 0