Setting regulatory information to wireless drivers via crda is currently broken
in openSUSE Tumbleweed:

  # COUNTRY=DE crda
  Database signature verification failed.
  No country match in regulatory database.
  # regdbdump /usr/lib/crda/regulatory.bin
  Database signature verification failed.

This is because openSUSE Tumbleweed currently ships with crda 1.1.3 and
wireless-regdb 2015.01.30.

Maintainership of wireless-regdb changed from John Linville to Seth Forshee in
December 2014 [1]. Thus the regulatory.bin file provided through wireless-regdb
is now signed by Seth Forshee's public key.

crda 1.1.3, however, contains John Linville's public key compiled-in only.
In crda 3.1.8, Seth's public key got included as well [2].

Thus, crda 3.1.8, already available in the "Hardware" repo at [3] should be
merged into Tumbleweed's main repos to get wireless regulatory setting working
again.

[1]:
https://git.kernel.org/cgit/linux/kernel/git/sforshee/wireless-regdb.git/commit/?id=052d3cb24461a68ad0a44172a4e26795253b97da
[2]:
https://git.kernel.org/cgit/linux/kernel/git/mcgrof/crda.git/commit/?id=805d84ac2e8d193583dedafa4cf885de22a5f92a
[3]: http://download.opensuse.org/repositories/hardware/openSUSE_Tumbleweed/