/**
  * @param \HttpDigest\Algorithm\AlgorithmInterface $algorithm
  * @param string|\Psr\Http\Message\StreamInterface $data
  *
  * @return string
  */
 private function getHash(AlgorithmInterface $algorithm, $data)
 {
     if ($data instanceof StreamInterface) {
         $hash = $algorithm->getHashOfStream($data);
     } else {
         $hash = $algorithm->getHash($data);
     }
     if ($algorithm->getDigestSize() / 4 < strlen($hash)) {
         $hash = substr($hash, 0, $algorithm->getDigestSize() / 4);
     }
     return $hash;
 }