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function toHexString(byteArray) {
  return Array.from(byteArray, function(byte) {
    return ('0' + (byte & 0xFF).toString(16)).slice(-2);
  }).join('')
}

function hmac(algorithm, key, message) {
  var mac = javax.crypto.Mac.getInstance(algorithm);
  mac.init(new javax.crypto.spec.SecretKeySpec(key, algorithm));
  return mac.doFinal(message);