xmlsec1 should be ported to use NSS library for cryptography.
See the tracking bug for details and links on how it could be done.
Details seems to imply a local fork of the code for Fedora, this doesn't
seems viable unless you accept to take the responsability for the forked
package. I won't mess with security related code, see my comment #5 in
the tracking bug,
What is the next step for this bug?