Daniel Golle 8174853c78 base-files: introduce sysupgrade signature chain verification
Verify ucert signature chains in sysupgrade images in case ucert is
installed and $CHECK_IMAGE_SIGNARURE = 1.
Also make sure ucert host binary is present and generate a self-signed
ucert in case $TOPDIR/key-build.ucert is missing.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2018-08-08 02:22:54 +02:00
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