Make an accelerated NRF52 implementation for AEX256-CTR crypto

platformio.ini

@@ -9,7 +9,7 @@
 ; https://docs.platformio.org/page/projectconf.html
 
 [platformio]
-default_envs = tbeam ; Note: the github actions CI test build can't yet build NRF52 targets
+default_envs = nrf52dk ; Note: the github actions CI test build can't yet build NRF52 targets
 
 [common]
 ; common is not currently used
@@ -84,7 +84,7 @@ src_filter =
 upload_speed = 921600
 debug_init_break = tbreak setup
 build_flags =
-  ${env.build_flags} -Wall -Wextra -Isrc/esp32
+  ${env.build_flags} -Wall -Wextra -Isrc/esp32 
 lib_ignore = segger_rtt
 
 ; The 1.0 release of the TBEAM board
@@ -129,8 +129,9 @@ platform = nordicnrf52
 framework = arduino
 debug_tool = jlink
 build_type = debug ; I'm debugging with ICE a lot now
+; note: liboberon provides the AES256 implementation for NRF52 (though not using the hardware acceleration of the NRF52840 - FIXME)
 build_flags = 
-  ${env.build_flags} -Wno-unused-variable -Isrc/nrf52 
+  ${env.build_flags} -Wno-unused-variable -Isrc/nrf52 -Isdk-nrfxlib/crypto/nrf_oberon/include -Lsdk-nrfxlib/crypto/nrf_oberon/lib/cortex-m4/hard-float/ -lliboberon_3.0.3
 ;-DCFG_DEBUG=3
 src_filter = 
   ${env.src_filter} -<esp32/>