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I met similar (but not exact) error like yours described in fatal-error-sha256-h-no-such-file-or-directory .

After many trials to installed some libraries, I failed.
Lastly, I installed Cryptosuite as guided in the README , it worked.

So I think you should install Cryptosuite.

Installing Cryprosuite doesn't help!

C:\Users\schrjude\Downloads\IRController\IRController.ino: In function 'bool validateHMAC(String, String, String, String)':
IRController:201: error: 'Sha256' was not declared in this scope
Sha256.initHmac((uint8_t*)key.c_str(), key.length()); // key, and length of key in bytes
IRController:206: error: 'HASH_LENGTH' was not declared in this scope
String computedSignature = bin2hex(hash, HASH_LENGTH);
exit status 1
'Sha256' was not declared in this scope

Duplicate of #169 .
Did you install Cryptosuite by " Add .ZIP Library... "? It cannot be installed directly from Library Manager.
Go to Sketch > Include Library and scroll down to see if "Cryptosuite" library is added or not. If Cryptosuite is not added, your installation was unsuccessful .

Yes, i did it so.
Now i erased all this libs and reinstalled it. Your programm compiled now ok!
Thank you!