static long hash128to64(long high, long low) {
    long a = (low ^ high) * K3;
    a ^= a >>> 47;
    long b = (high ^ a) * K3;
    b ^= b >>> 47;
    b *= K3;
    return b;
  }

  /**
   * Computes intermediate hash of 32 bytes of byte array from the given offset. Results are
   * returned in the output array - this is 12% faster than allocating new arrays every time.
   */
  private static void weakHashLength32WithSeeds(

        if (len == 0) {
            return; /* CRITICAL */
        }
        digest.update(input, offset, len);
        updates++;
    }

    /**
     * Computes and returns the message digest.
     *
     * @return the computed digest bytes
     */
    public byte[] digest() {
        byte[] b = digest.digest();

        if (LogStream.level >= 5) {
            log.println("digest: ");

	case h.End == -1:
		rangeLength = resourceSize - h.Start

	default:
		return 0, errors.New("Unexpected range specification case")
	}

	return rangeLength, nil
}

// GetOffsetLength computes the start offset and length of the range
// given the size of the resource
func (h *HTTPRangeSpec) GetOffsetLength(resourceSize int64) (start, length int64, err error) {
	if h == nil {

  static long hash128to64(long high, long low) {
    long a = (low ^ high) * K3;
    a ^= a >>> 47;
    long b = (high ^ a) * K3;
    b ^= b >>> 47;
    b *= K3;
    return b;
  }

  /**
   * Computes intermediate hash of 32 bytes of byte array from the given offset. Results are
   * returned in the output array - this is 12% faster than allocating new arrays every time.
   */
  private static void weakHashLength32WithSeeds(

     */
    @Override
    public String getName() {
        final boolean d = domain.length() > 0 && !domain.equals("?");
        return d ? domain + "\\" + username : username;
    }

    /**
     * Computes the 24 byte ANSI password hash given the 8 byte server challenge.
     *
     * @param challenge the server challenge bytes
     * @return the ANSI password hash
     */

     */
    public boolean isPreferredMech(ASN1ObjectIdentifier mechanism) {
        return NtlmContext.NTLMSSP_OID.equals(mechanism);
    }

    /**
     * Computes the 24 byte ANSI password hash given the 8 byte server challenge.
     *
     * @param tc the CIFS context
     * @param chlng the server challenge
     * @return the hash for the given challenge

  //
  // 1) Optimal k = b * ln2
  // 2) p = (1 - e ^ (-kn/m))^k
  // 3) For optimal k: p = 2 ^ (-k) ~= 0.6185^b
  // 4) For optimal k: m = -nlnp / ((ln2) ^ 2)

  /**
   * Computes the optimal number of hash functions (k) for a given false positive probability (p).
   *
   * <p>See http://en.wikipedia.org/wiki/File:Bloom_filter_fp_probability.svg for the formula.
   *

            assertThrows(SmbUnsupportedOperationException.class, () -> transport.calculatePreauthHash(new byte[] { 1, 2, 3 }, 0, 3, null));
        }

        @Test
        @DisplayName("calculatePreauthHash computes SHA-512 chain for SMB 3.1.1")
        void preauthHash_happyPath() throws Exception {
            setField(transport, "smb2", true);
            Smb2NegotiateResponse nego = new Smb2NegotiateResponse(cfg);

  static int checkPositiveAndMakeMultipleOf32(int bits) {
    checkArgument(bits > 0, "Number of bits must be positive");
    return (bits + 31) & ~31;
  }

  /**
   * Returns a hash function which computes its hash code by concatenating the hash codes of the
   * underlying hash functions together. This can be useful if you need to generate hash codes of a
   * specific length.
   *

    assertEquals(expectedMean, IntMath.mean(x, y));
    assertEquals(
        "The mean of x and y should equal the mean of y and x", expectedMean, IntMath.mean(y, x));
  }

  /**
   * Computes the mean in a way that is obvious and resilient to overflow by using BigInteger
   * arithmetic.
   */
  private static int computeMeanSafely(int x, int y) {
    BigInteger bigX = BigInteger.valueOf(x);