code: public void uploadUsers(String hashAlgorithm, byte[] hashKey, List<GitkitUser> users,
                            byte[] saltSeparator, Integer rounds, Integer memoryCost)
            throws GitkitServerException, GitkitClientException {
        rpcHelper.uploadAccount(hashAlgorithm, hashKey, users, saltSeparator, rounds, memoryCost);
    }
docs: Uploads multiple user accounts to Gitkit server.
  
  @param hashAlgorithm hash algorithm. Supported values are HMAC_SHA256, HMAC_SHA1, HMAC_MD5,
  PBKDF_SHA1, MD5 and SCRYPT.
  @param hashKey key of hash algorithm
  @param users list of user accounts to be uploaded
  @param saltSeparator the salt separator
  @param rounds rounds for hash calculation. Used by scrypt and similar algorithms.
  @param memoryCost memory cost for hash calculation. Used by scrypt similar algorithms.
  @throws GitkitClientException for invalid request
  @throws GitkitServerException for server error