At present this tool only checks the configuration signing. Have it also
look at each of the images in the configuration and confirm that they
verify.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de> (v1)

It is more common to have 0 mean OK, and -ve mean error. Change this
function to work the same way to avoid confusion.

Signed-off-by: Simon Glass <sjg@chromium.org>

These tools crash if no arguments are provided. Add checks to avoid this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>

When adding hashes or signatures, the target FDT may be full. Detect this
and automatically try again after making 1KB of space.

Signed-off-by: Simon Glass <sjg@chromium.org>

Make the error handling common, and make sure the file is always closed
on error. Rename the parameter to be more description and add comments.

Signed-off-by: Simon Glass <sjg@chromium.org>

It is trivial to crash fit_check_sign by invoking with an
absolute path in a deeply nested directory.  This is exposed
by vboot_test.sh.

Signed-off-by: Michael van der Westhuizen <michael@smart-africa.com>
Acked-by: Simon Glass <sjg@chromium.org>

add host tool "fit_check_sign" which verifies, if a fit image is
signed correct.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Simon Glass <sjg@chromium.org>