If you have an outdated ESP32 core, you will probably see the message like this while compiling the code:

ResolveLibrary(sha/sha_parallel_engine.h)
  -> candidates: []ESP32_Code:59:85: fatal error: sha/sha_parallel_engine.h: No such file or directory
 #include "sha/sha_parallel_engine.h" // Include hardware accelerated hashing library
                  ^
compilation terminated.

To solve that, you can either:

Update your ESP32 core (recommended for the future)

Open Arduino IDE > File > Preferences > In the Additional boards URL field put:
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json

After doing that, update your ESP32 core: Arduino IDE > Tools > Board > Boards Manager > Type esp32 > Install version 2.0.1

You should now be able to compile the code without any problems.

Or use the older library version

Go to line 59 of the ESP32_Code.ino that says

#include "sha/sha_parallel_engine.h" // Include hardware accelerated hashing library

Comment it:

//#include "sha/sha_parallel_engine.h" // Include hardware accelerated hashing library

And enable the old library (uncomment line 58):

#include "hwcrypto/sha.h"

You should now be able to compile the code. Keep in mind using the old library will yield to worse performance.