This adds the key and cert data used for DIR-X1860 B1 and DIR-X1550 A1 to support de-/encryption their firmware files. Key and cert were extracted from the vendor gpl archive found here: https://ftp.dlink.de/dir/dir-x1550/driver_software/DIR-X1550_sw_reva_GPLcode.tar.gz and tested against vendor firmware for both revisions. Note that images of DIR-X1860 revision A1 are not supported by this and either use a different encryption method or different key/cert. Signed-off-by: Christoph Krapp <achterin@gmail.com> Link: https://github.com/openwrt/firmware-utils/pull/54 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>