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[Launchpad Bug Tracker <1831942@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package u-boot -
2018.07~rc3+dfsg1-0ubuntu3~18.04.1

---------------
u-boot (2018.07~rc3+dfsg1-0ubuntu3~18.04.1) bionic; urgency=low

  * Enable FIT signing support (LP: #1831942)
    - Enable CONFIG_FIT_SIGNATURE so we can sign FIT images.
    - Add libssl-dev to Build-Depends: to enable crypto functionality.
    - Limit key names to keys within the keydir.

 -- Andy Whitcroft <apw@xxxxxxxxxx>  Mon, 10 Jun 2019 20:52:14 +0100

** Changed in: u-boot (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1831942

Title:
  support u-boot Flat Image Tree (FIT) signing support

Status in Launchpad itself:
  In Progress
Status in u-boot package in Ubuntu:
  Fix Released
Status in u-boot source package in Xenial:
  Fix Released
Status in u-boot source package in Bionic:
  Fix Released
Status in u-boot source package in Cosmic:
  Fix Released
Status in u-boot source package in Disco:
  Fix Released
Status in u-boot source package in Eoan:
  Fix Released

Bug description:
  [Impact] the existing mkimage/dumpimage tools are unable to make or
  dump out the contents of a u-boot FIT image.

  [Test Case] run mkimage with no arguments, note that FIT images and
  signing are shown as disabled.  Install the updated version and note
  that FIT images and signing are now shown as enabled.  Run the
  attached TEST-FIT script which will put together a sample image,
  generate some keys, and sign the resulting image contents.  You will
  see "kernel.img: Device Tree Blob version 17,..." if the image is
  created and you will see dumpimage output showing it is not yet signed
  (Sign value: unavailable).  The signatures will then be applied and
  the image redumped and you will see it is now signed (Sign value:
  <hex>).

  [Regression Potential] though this changes the u-boot boot loader
  package, only the build of the u-boot-utils package contents is
  modified.  This primarily enabled FIT_SIGNATURE support in the
  configuration before building those tools.  The majority of the tools
  we ship do not have configuration support even and so should not be
  affected.  mkimage et al are not normally used during a
  kernel/bootloader update and so the risk to a pre-installed system
  should be low.  There is slightly higher risk in the xenial changes as
  the enablement has enabled some additional tool builds, but none of
  those are shipped in the resulting binaries.

  ===

  We need a mechanism for securely signing Flat Image Tree binaries.
  This will be performed in a similar manner to UEFI signing support via
  a custom binary upload to launchpad.  We will also need a u-boot
  update to enable image creation and signing support in mkimage.

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