xsane should be ported to use NSS library for cryptography.
See the tracking bug for details and links on how it could be done.
Where in xsane does it use cryptography that you think needs to be converted
over to using NSS?
MD5 for authentication against sane server?
Sorry for the long wait. At the moment, I don't have the time to work on this, such a change would have to be done involving upstream. Closing accordingly.