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For design context, see go/cros-unibuild-signing This adds support for multiple, shared firmware images from a unified build that needs to be signed with different OEM specific keys. It uses a signer_config.csv file (that is generated by pack_firmware.py) to determine which images need to be signed with which keys. BUG=b:64842314 TEST=./build_image --board=coral dev && ./mod_image_for_recovery.sh --board=coral && ~/trunk/src/platform/vboot_reference/scripts/image_signing/sign_official_build.sh recovery ../build/images/coral/latest/recovery_image.bin ../platform/vboot_reference/tests/devkeys BRANCH=None Change-Id: Id3711bbe73dfe652184bc046b5f642c30b8d1627 Reviewed-on: https://chromium-review.googlesource.com/626718 Commit-Ready: C Shapiro <shapiroc@google.com> Tested-by: C Shapiro <shapiroc@google.com> Reviewed-by: C Shapiro <shapiroc@google.com>