stunnel

The stunnel program is designed to work as an SSL encryption wrapper between remote client and local (inetd-startable) or remote server. It can be used to add SSL functionality to commonly used inetd daemons like POP2, POP3, and IMAP servers without any changes in the programs' code. Stunnel uses the OpenSSL library for cryptography, so it supports whatever cryptographic algorithms are compiled into the library.  Stunnel can benefit from FIPS 140-2 certification of the OpenSSL library, as long as the building process meets its Security Policy. A scanned FIPS 140-2 Validation Certificate document is also available for download on the NIST web page. FIPS 140-2 support is also available in the Windows binary installer.