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gstreamer-plugins-base should be ported to use NSS library for cryptography. See the tracking bug for details and links on how it could be done.
Which specific parts of gstreamer-plugins-base did you have in mind?
gst-libs/gst/cdda contains SHA-1 code, but this bug can be probably closed-wontfix as using SHA-1 in cdda is not security relevant.
I filed http://bugzilla.gnome.org/show_bug.cgi?id=53631 about removing the sha1.[ch] copy, and using glib's version instead.