• https://github.com/openbsd/src/tree/master/lib/libc/crypt
• https://github.com/rgdaddio/bcrypt-linux-c-cpp
• https://github.com/hilch/Bcrypt.cpp/blob/master/src/bcrypt.cpp
• https://man.openbsd.org/OpenBSD-5.8/crypt.3
• https://github.com/abhay/erlang-bcrypt