The value here gets passesd to :crypto.pbkdf2_hmac and it expects one of these atoms: :sha | :sha224 | :sha256 | :sha384 | :sha512 so it will always exist
The value here gets passesd to :crypto.pbkdf2_hmac and it expects one of these atoms: :sha | :sha224 | :sha256 | :sha384 | :sha512 so it will always exist