GNU SASL is an implementation of the Simple Authentication and Security Layer 
framework and a few common SASL mechanisms.  The library includes support for 
the SASL framework (with authentication functions and application data privacy
and integrity functions) and at least partial support for the CRAM-MD5, 
EXTERNAL, GSSAPI, ANONYMOUS, PLAIN, SECURID, DIGEST-MD5, LOGIN, NTLM and 
KERBEROS_V5 mechanisms.