[embassy-usb-dfu] support ed25519 verification

This commit adds the ability to verify that USB DFU updates are correctly signed using ed25519.
This required adding support to embassy-boot for reading from the DFU partition.

2 files changed, 6 insertions, 4 deletions

diff --git a/examples/boot/application/stm32wb-dfu/memory.x b/examples/boot/application/stm32wb-dfu/memory.x
index ff1b800d2..f1e6b053c 100644
--- a/examples/boot/application/stm32wb-dfu/memory.x
+++ b/examples/boot/application/stm32wb-dfu/memory.x
@@ -1,10 +1,10 @@
 MEMORY
 {
   /* NOTE 1 K = 1 KiBi = 1024 bytes */
-  BOOTLOADER                        : ORIGIN = 0x08000000, LENGTH = 24K
-  BOOTLOADER_STATE                  : ORIGIN = 0x08006000, LENGTH = 4K
-  FLASH                             : ORIGIN = 0x08008000, LENGTH = 128K
-  DFU                               : ORIGIN = 0x08028000, LENGTH = 132K
+  BOOTLOADER                        : ORIGIN = 0x08000000, LENGTH = 48K
+  BOOTLOADER_STATE                  : ORIGIN = 0x0800C000, LENGTH = 4K
+  FLASH                             : ORIGIN = 0x0800D000, LENGTH = 120K
+  DFU                               : ORIGIN = 0x0802B000, LENGTH = 120K
   RAM                         (rwx) : ORIGIN = 0x20000000, LENGTH = 32K
 }
 
diff --git a/examples/boot/application/stm32wb-dfu/secrets/key.sec b/examples/boot/application/stm32wb-dfu/secrets/key.sec
new file mode 100644
index 000000000..52e7f125b
--- /dev/null
+++ b/examples/boot/application/stm32wb-dfu/secrets/key.sec
@@ -0,0 +1,2 @@
+untrusted comment: signify secret key
+RWRCSwAAAAATdHQF3B4jEIoNZrjADRp2LbjJjNdNNzKwTCe4IB6mDNq96pe53nbNxwbdCc/T4hrz7W+Kx1MwrZ0Yz5xebSK5Z0Kh/3Cdf039U5f+eoTDS2fIGbohyUbrtwKzjyE0qXI=