proftpd-mod-crypto 1.3.7a+dfsg-12 (armhf binary) in ubuntu impish

 ProFTPD is a powerful modular FTP/SFTP/FTPS server. This File Transfer
 Protocol daemon supports also hidden directories, virtual hosts, and
 per-directory ".ftpaccess" files. It uses a single main configuration
 file, with a syntax similar to Apache.
 .
 Because of the advanced design, anonymous-FTP directories can have
 an arbitrary internal structure (bin, lib, etc, and special files are
 not needed). Advanced features such as multiple password files and
 upload/download ratios are also supported.
 .
 The proftpd-mod-crypto package carries some proftp modules having to do
 with crypto technologies. These modules are linked with libsodium, which
 is not needed by the main binary:
  - mod_sftp.so
  - mod_sql_passwd.so
  - mod_tls.so