examples/plugins/stats/js/sha512.js
function rstr_hmac_sha512(key, data)
{
  var bkey = rstr2binb(key);
  if(bkey.length > 32) bkey = binb_sha512(bkey, key.length * 8);

  var ipad = Array(32), opad = Array(32);
  for(var i = 0; i < 32; i++)
  {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }

  var hash = binb_sha512(ipad.concat(rstr2binb(data)), 1024 + data.length * 8);
  return binb2rstr(binb_sha512(opad.concat(hash), 1024 + 512));
}
function rstr_hmac_sha512(key, data)
{
  var bkey = rstr2binb(key);
  if(bkey.length > 32) bkey = binb_sha512(bkey, key.length * 8);

  var ipad = Array(32), opad = Array(32);
  for(var i = 0; i < 32; i++)
  {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }

  var hash = binb_sha512(ipad.concat(rstr2binb(data)), 1024 + data.length * 8);
  return binb2rstr(binb_sha512(opad.concat(hash), 1024 + 512));
}
/*
Calculate the HMAC-SHA-512 of a key and some data (raw strings)