dbus should be ported to use NSS library for cryptography. See the tracking bug for details and links on how it could be done.
AFAIK, we don't use any non-trivial crypt in D-Bus right now [davidz@oneill ~]$ ldd /lib/libdbus-1.so linux-gate.so.1 => (0x00110000) libcap.so.1 => /lib/libcap.so.1 (0x0088d000) libc.so.6 => /lib/libc.so.6 (0x00111000) /lib/ld-linux.so.2 (0xb7fb6000) [davidz@oneill ~]$ ldd /bin/dbus-daemon linux-gate.so.1 => (0x0012d000) libexpat.so.1 => /lib/libexpat.so.1 (0x0012e000) libselinux.so.1 => /lib/libselinux.so.1 (0x0014f000) libpthread.so.0 => /lib/libpthread.so.0 (0x0016a000) libaudit.so.0 => /lib/libaudit.so.0 (0x00183000) libcap.so.1 => /lib/libcap.so.1 (0x00198000) libc.so.6 => /lib/libc.so.6 (0x0019b000) libdl.so.2 => /lib/libdl.so.2 (0x002f4000) /lib/ld-linux.so.2 (0x00110000) There's talk of adding TLS support, for the TCP/IP transport, I know that Lennart needs that for Mango Lassi http://0pointer.de/blog/projects/mango-lassi.html Anyway, closing as NOTABUG since we don't use non-trivial cryptography. Adding the upstream author in case he wants to chip in. Feel free to reopen if I'm wrong. Thanks, David