TOTP

lib/Arduino-TOTP-RFC6238-generator/README.md

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+# Arduino libary for TOTP generation
+
+Example use:
+
+     // Seed value - as per the QR code; which is in fact a base32 encoded
+     // byte array (i.e. it is binary).
+     //
+     const char * seed = "ORUGKU3FMNZGK5CTMVSWI===";
+   
+     // Example of the same thing - but as usually formatted when shown
+     // as the 'alternative text to enter'
+     //
+     // const char * seed = "ORU GKU 3FM NZG K5C TMV SWI";
+   
+     String * otp = TOTP::currentOTP(seed);
+   
+     Serial.print(ctime(&t));
+     Serial.print("   TOTP at this time is: ");
+     Serial.println(*otp);
+     Serial.println();
+  
+This assumes a normal RFC compliant TOTP. It is possible that the Qr code provides
+different values for the interval (default is 30 seconds), epoch or the hash (sha1). 
+These can be passwd as optional arguments.