totp : rework and add SHA256/512 (#151)

* totp : rework and add SHA256/512

* totp : comment code

* totp : fix SHA224/SHA384 and examples

* totp : fix bug in totp_face_lfs

* totp : init_totp_record to SHA1

* totp : move TOTP-MCU to TOTP, update README and example

* totp : SHAX, use size_t n instead of harcoded 8

* clarify what to put in TOTP face

Co-authored-by: Emilien <Emilien>
Co-authored-by: joeycastillo <joeycastillo@utexas.edu>

movement/lib/TOTP/TOTP.h

@@ -0,0 +1,21 @@
+#ifndef TOTP_H_
+#define TOTP_H_
+
+#include <inttypes.h>
+#include "time.h"
+
+typedef enum {
+    SHA1,
+    SHA224,
+    SHA256,
+    SHA384,
+    SHA512
+} hmac_alg;
+
+void TOTP(uint8_t* hmacKey, uint8_t keyLength, uint32_t timeStep, hmac_alg algorithm);
+void setTimezone(uint8_t timezone);
+uint32_t getCodeFromTimestamp(uint32_t timeStamp);
+uint32_t getCodeFromTimeStruct(struct tm time);
+uint32_t getCodeFromSteps(uint32_t steps);
+
+#endif // TOTP_H_