final DerivationParameters param = new KDFCounterParameters(sessionKey, null /* prefix */, suffix /* suffix */, r /* r */);
        gen.init(param);

        final byte[] derived = new byte[16];
        gen.generateBytes(derived, 0, 16);
        return derived;
    }

    /**
     * @param string
     * @return null terminated ASCII bytes
     */
    private static byte[] toCBytes(final String string) {

            }
          };
      ClosingFuture<V> derived = new ClosingFuture<>(futureCombiner().call(callable, executor));
      derived.closeables.add(closeables, directExecutor());
      return derived;
    }

    /**
     * Returns a new {@code ClosingFuture} pipeline step derived from the inputs by applying a

            }
          };
      ClosingFuture<V> derived = new ClosingFuture<>(futureCombiner().call(callable, executor));
      derived.closeables.add(closeables, directExecutor());
      return derived;
    }

    /**
     * Returns a new {@code ClosingFuture} pipeline step derived from the inputs by applying a

        // Arrange - use a real cause so message is derived from cause.toString()
        Throwable cause = new IllegalStateException("proto mismatch");
        String expectedMessage = cause.toString();

        // Act
        SMBProtocolDowngradeException ex = new SMBProtocolDowngradeException(cause);

        // Assert - cause preserved, message derived from cause
        assertSame(cause, ex.getCause());

        byte[] derived1 = keyManager.deriveKey(baseKey, "label1", null, 32);
        byte[] derived2 = keyManager.deriveKey(baseKey, "label2", null, 32);
        byte[] derived3 = keyManager.deriveKey(baseKey, "label1", new byte[] { 1, 2, 3 }, 32);

        assertEquals(32, derived1.length, "Derived key should have correct length");
        assertEquals(32, derived2.length, "Derived key should have correct length");

        assertEquals(10, ndrBuffer.getLength());

        ndrBuffer.setLength(20);
        assertEquals(20, ndrBuffer.getLength());

        // Test with derived buffer
        NdrBuffer derived = ndrBuffer.derive(0);
        derived.setLength(5);
        assertEquals(5, derived.getLength());
        assertEquals(5, ndrBuffer.getLength()); // Should affect original's deferred length
    }

    @Test
    void testAdvance() {

        // Then
        assertFalse(Arrays.equals(signingKey1, signingKey2), "Different session keys should produce different derived keys");
    }

    @Test
    @DisplayName("Should derive unique keys for different preauth values")
    void testDeriveKeys_UniquePreauthValues() {
        // Given
        byte[] preauth1 = new byte[64];

        this.start = index = start;
        length = 0;
        deferred = this;
    }

    /**
     * Creates a derived NdrBuffer at the specified index position.
     *
     * @param idx the index position for the derived buffer
     * @return the derived NdrBuffer
     */
    public NdrBuffer derive(final int idx) {
        final NdrBuffer nb = new NdrBuffer(buf, start);
        nb.index = idx;
        nb.deferred = deferred;

            byte[] hash = md.digest(input);
            System.arraycopy(hash, 0, derived, 0, Math.min(length, hash.length));

            // If we need more bytes, hash again with counter
            int counter = 1;
            while (derived.length > hash.length * counter) {
                md.update(input);
                md.update((byte) counter);

    verifySortedSetContents(set, SOME_ITERABLE, null);
  }

  public void testNewTreeSetFromIterableDerived() {
    Iterable<Derived> iterable = asList(new Derived("foo"), new Derived("bar"));
    TreeSet<Derived> set = Sets.newTreeSet(iterable);
    assertThat(set).containsExactly(new Derived("bar"), new Derived("foo")).inOrder();
  }

  public void testNewTreeSetFromIterableNonGeneric() {
    Iterable<LegacyComparable> iterable =