Add ChromeOS futility tool and automatic signing

futility is built from these sources:
https://github.com/jcadduono/platform_external_vboot_reference
Commit reference 4b06fdee95

Signed-off-by: James Christopher Adduono <[email protected]>

nethunter-installer/boot-patcher/boot-patcher.sh

@@ -229,6 +229,24 @@ samsung_tag() {
 	fi
 }
 
+# sign the boot image with futility if it was a ChromeOS boot image
+sign_chromeos() {
+	[ -f "$split_img/boot.img-chromeos" ] || return
+	print "Signing ChromeOS boot image..."
+	cd "$tmp"
+	mv boot-new.img boot-new-unsigned.img
+	echo " " > empty
+	# sign the new boot image (using AOSP dev kernel test-keys)
+	"$bin/chromeos/futility" vbutil_kernel \
+		--pack boot-new.img \
+		--vmlinuz boot-new-unsigned.img \
+		--config empty --bootloader empty \
+		--verbose --arch "$ARCH" --version 1 \
+		--keyblock "$bin/chromeos/kernel.keyblock" \
+		--signprivate "$bin/chromeos/kernel_data_key.vbprivk" \
+		--flags 0x1 || abort "Failed to sign ChromeOS boot image!"
+}
+
 # backup old boot image
 backup_boot() {
 	[ "$boot_backup" ] || return
@@ -293,6 +311,8 @@ build_boot
 
 samsung_tag
 
+sign_chromeos
+
 verify_size
 
 backup_boot