Sending single sign in tokens using Keybaord HID for TOTP sign in

Finally had some time to create the modules:

HMAC
TOTP

I will add proper READMEs soon.

Usage:

const HMAC = require('https://raw.githubusercontent.c­om/coajaxial/espruino-hmac/master/hmac.j­s');

var hmac = HMAC.SHA1(E.toArrayBuffer('my secret key'));
console.log(hmac.digest(E.toArrayBuffer(­'my message')));

// FixedSHA1 is faster than SHA1, but digested message must always be the same fixed length.
var hmacf = HMAC.FixedSHA1(E.toArrayBuffer('my secret key'), 2); // 2 bytes
console.log(hmacf.digest(E.toArrayBuffer­('bb')));
console.log(hmacf.digest(E.toArrayBuffer­('xx')));

const TOTP = require('https://raw.githubusercontent.c­om/coajaxial/espruino-totp/master/totp.j­s');

const totp = TOTP.create('JBSWY3DPEHPK3PXP');
console.log(totp.generate(getTime(), 6, 30));