This is not necessary anymore, now picotool writes the AES key to otp json files

Fixes #613

This is not necessary anymore, now picotool writes the AES key to otp json files

Fixes #613

This is not necessary anymore, now picotool writes the AES key to otp json files

Fixes #613

This is not necessary anymore, now picotool writes the AES key to otp json files

Fixes #613

* Use key share for AES file

Update CMake tooling to use 128 byte key files (a 4-way share of the 32 byte key).
Also temporarily update the enc_bootloader to deshare this key - the actual fix will need to be in aes.S.

* Improve checking for malicious flash data

Add data_max_size to prevent overwriting the bootloader with data from flash

* Incorporate latest changes to aes.S

Also shrink the space allocated for the bootloader to 32K (plus 8K scratch)

* Encorporated latest encryption code with 4-way shares

Also switch to random default key

* Apply encrypted-example 6de8084b6eda

* Add hello_encrypted example

* Use new `enable_interrupts` function

* Remove update-key.cmake

This is not necessary anymore, now picotool writes the AES key to otp json files

Fixes #613

* Add hello_encrypted to readme

* Update enc_bootloader with latest aes.S (picotool 333d571c)

CK_JITTER is removed as the enc_bootloader runs from XOSC not ROSC

* Add IV salts

* Update with latest aes.S

* Update readmes

This includes the changes from #553

* Add secret file to print out

This is useful for testing decryption with large files

* Add notes about unique AES keys, and not losing keys/salts

* Update readmes

* Fix enc_bootloader example OTP output

* Remove OTP key locking functionality from encrypted examples

* Improve TBYB sequence

Add self check (1 == 1), which is only performed on first boot

* Review fixups

Comments and readme

* Add MbedTLS self-decrypting example