Added helper scripts to create test update images, config for enc-uart

use case

Author: danielinux

config/examples/stm32wb-uart-flash-encryption.config

@@ -0,0 +1,28 @@
+ARCH?=ARM
+TARGET?=stm32wb
+SIGN?=ECC256
+HASH?=SHA256
+DEBUG?=0
+VTOR?=1
+CORTEX_M0?=0
+NO_ASM?=0
+EXT_FLASH?=1
+SPI_FLASH?=0
+NO_XIP?=0
+UART_FLASH?=1
+ALLOW_DOWNGRADE?=0
+NVM_FLASH_WRITEONCE?=1
+WOLFBOOT_VERSION?=0
+V?=0
+NO_MPU?=0
+SPMATH?=1
+RAM_CODE?=0
+DUALBANK_SWAP?=0
+IMAGE_HEADER_SIZE?=256
+PKA?=0
+WOLFTPM?=0
+WOLFBOOT_PARTITION_SIZE?=0x20000
+WOLFBOOT_SECTOR_SIZE?=0x1000
+WOLFBOOT_PARTITION_BOOT_ADDRESS?=0x08010000
+WOLFBOOT_PARTITION_UPDATE_ADDRESS?=0x0
+WOLFBOOT_PARTITION_SWAP_ADDRESS?=0x20000

tools/scripts/prepare_encrypted_update.sh

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+#!/bin/bash
+# SIZE is WOLFBOOT_PARTITION_SIZE - 5
+SIZE=131067 
+VERSION=8
+APP=test-app/image_v"$VERSION"_signed_and_encrypted.bin
+
+# Create test key
+echo -n "0123456789abcdef0123456789abcdef" > enc_key.der
+
+./tools/keytools/sign.py --encrypt enc_key.der test-app/image.bin ecc256.der $VERSION
+dd if=/dev/zero bs=$SIZE count=1 2>/dev/null | tr "\000" "\377" > update.bin
+dd if=$APP of=update.bin bs=1 conv=notrunc
+printf "pBOOT"  >> update.bin
+
+

tools/scripts/prepare_update.sh

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+#!/bin/bash
+# SIZE is WOLFBOOT_PARTITION_SIZE - 5
+SIZE=131067
+VERSION=8
+APP=test-app/image_v"$VERSION"_signed.bin
+./tools/keytools/sign.py test-app/image.bin ecc256.der $VERSION
+dd if=/dev/zero bs=$SIZE count=1 2>/dev/null | tr "\000" "\377" > update.bin
+dd if=$APP of=update.bin bs=1 conv=notrunc
+printf "pBOOT"  >> update.bin
+