[meta-arago][scarthgap][PATCH RFC 4/4] swupdate: enable authentication for update image

[Anshul Dalal <anshuld@ti.com>]

To ensure the platform can only be updated from an authorised source,
this patch adds signing to the .swu update image using the pre-existing
custMpk keys from ti-secdev.

Signed-off-by: Anshul Dalal <anshuld@ti.com>
---
 .../recipes-swupdate/images/files/sw-description             | 2 ++
 meta-arago-distro/recipes-swupdate/images/update-image.bb    | 4 ++++
 meta-arago-distro/recipes-swupdate/swupdate/files/defconfig  | 1 +
 .../recipes-swupdate/swupdate/files/swupdate.sh              | 2 +-
 .../recipes-swupdate/swupdate/swupdate_%.bbappend            | 5 +++++
 5 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/meta-arago-distro/recipes-swupdate/images/files/sw-description b/meta-arago-distro/recipes-swupdate/images/files/sw-description
index 241bc95c..8a7e5f4d 100644
--- a/meta-arago-distro/recipes-swupdate/images/files/sw-description
+++ b/meta-arago-distro/recipes-swupdate/images/files/sw-description
@@ -13,6 +13,7 @@ software =
 						device = "/dev/mmcblk0p1";
 						type = "raw";
 						compressed = "zlib";
+						sha256 = "$swupdate_get_sha256(@@IMAGE_BASENAME@@-@@MACHINE@@.rootfs.ext4.gz)";
 					},
 				);
 				uboot: (
@@ -30,6 +31,7 @@ software =
 						device = "/dev/mmcblk0p2";
 						type = "raw";
 						compressed = "zlib";
+						sha256 = "$swupdate_get_sha256(@@IMAGE_BASENAME@@-@@MACHINE@@.rootfs.ext4.gz)";
 					},
 				);
 				uboot: (
diff --git a/meta-arago-distro/recipes-swupdate/images/update-image.bb b/meta-arago-distro/recipes-swupdate/images/update-image.bb
index 33b0b74c..6176e5a6 100644
--- a/meta-arago-distro/recipes-swupdate/images/update-image.bb
+++ b/meta-arago-distro/recipes-swupdate/images/update-image.bb
@@ -1,4 +1,5 @@
 inherit swupdate
+inherit ti-secdev
 
 IMAGE_BASENAME ?= "tisdk-default-image"
 
@@ -21,3 +22,6 @@ SWUPDATE_IMAGES_FSTYPES[tisdk-bootstrap-image] = ".rootfs.ext4.gz"
 SWUPDATE_IMAGES_FSTYPES[tisdk-jailhouse-image] = ".rootfs.ext4.gz"
 SWUPDATE_IMAGES_FSTYPES[tisdk-thinlinux-image] = ".rootfs.ext4.gz"
 SWUPDATE_IMAGES_FSTYPES[tisdk-bootstrap-base-image] = ".rootfs.ext4.gz"
+
+SWUPDATE_SIGNING = "RSA"
+SWUPDATE_PRIVATE_KEY = "${TI_SECURE_DEV_PKG}/keys/custMpk.key"
diff --git a/meta-arago-distro/recipes-swupdate/swupdate/files/defconfig b/meta-arago-distro/recipes-swupdate/swupdate/files/defconfig
index 4a2d78c0..0bf605f7 100644
--- a/meta-arago-distro/recipes-swupdate/swupdate/files/defconfig
+++ b/meta-arago-distro/recipes-swupdate/swupdate/files/defconfig
@@ -4,6 +4,7 @@ CONFIG_HW_COMPATIBILITY=y
 CONFIG_UBOOT=y
 CONFIG_SYSTEMD=y
 CONFIG_WEBSERVER=y
+CONFIG_SIGNED_IMAGES=y
 CONFIG_BOOTLOADERHANDLER=y
 CONFIG_CFI=y
 CONFIG_EMMC_HANDLER=y
diff --git a/meta-arago-distro/recipes-swupdate/swupdate/files/swupdate.sh b/meta-arago-distro/recipes-swupdate/swupdate/files/swupdate.sh
index 2083062e..fc32e4cf 100644
--- a/meta-arago-distro/recipes-swupdate/swupdate/files/swupdate.sh
+++ b/meta-arago-distro/recipes-swupdate/swupdate/files/swupdate.sh
@@ -12,4 +12,4 @@ fi
 UBOOT_BOOTCOUNT_ADDR=0x4301c100
 
 devmem2 $UBOOT_BOOTCOUNT_ADDR w 0
-swupdate -H @MACHINE@:1.0 ${SELECTION} -p 'reboot' -f /etc/swupdate.cfg -w "-r /www -p 8080"
+swupdate -H @MACHINE@:1.0 ${SELECTION} -p 'reboot' -f /etc/swupdate.cfg -w "-r /www -p 8080" -k /etc/custMpk.pub
diff --git a/meta-arago-distro/recipes-swupdate/swupdate/swupdate_%.bbappend b/meta-arago-distro/recipes-swupdate/swupdate/swupdate_%.bbappend
index 20f87435..bff44926 100644
--- a/meta-arago-distro/recipes-swupdate/swupdate/swupdate_%.bbappend
+++ b/meta-arago-distro/recipes-swupdate/swupdate/swupdate_%.bbappend
@@ -1,4 +1,5 @@
 inherit swupdate-lib
+inherit ti-secdev
 
 FILESEXTRAPATHS:append := "${THISDIR}/files:"
 
@@ -8,6 +9,8 @@ FILES:${PN} += " \
   ${SWUPDATE_HW_COMPATIBILITY_FILE} \
 "
 
+DEPENDS += "openssl-native"
+
 SRC_URI += " \
     file://defconfig \
     file://swupdate.sh \
@@ -27,4 +30,6 @@ do_install:append () {
   install -d ${D}${sysconfdir}
   install -m 644 ${WORKDIR}/swupdate.cfg ${D}${sysconfdir}
   sed -i "s#@MACHINE@#${MACHINE}#g" ${D}${sysconfdir}/swupdate.cfg
+
+  openssl rsa -in ${TI_SECURE_DEV_PKG}/keys/custMpk.key -pubout -out ${D}/etc/custMpk.pub
 }
-- 
2.52.0