Simple DFA on SM4 round31, round30, round29 and round 28. And recover the master key by these four round keys.
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x14osv_service_v1.proto\x12\x06osv.v1\x1a\x17osv/vulnerability.proto\x1a\x1cgoogle/api/annotations ...