for (int i = 0; i < dst.length; i++) {
            dst[i] = (byte) (i & 0xFF);
        }

        int startIndex = 5;
        int bytesWritten = querySecurityDesc.writeParametersWireFormat(dst, startIndex);

        // Check that bytes before startIndex are unchanged
        for (int i = 0; i < startIndex; i++) {
            assertEquals((byte) (i & 0xFF), dst[i]);
        }

    }

    @Test
    @DisplayName("setFileId should update file ID")
    void testSetFileId() throws Exception {
        byte[] newFileId = new byte[16];
        Arrays.fill(newFileId, (byte) 0xFF);

        request.setFileId(newFileId);

        Field fileIdField = Smb2FlushRequest.class.getDeclaredField("fileId");
        fileIdField.setAccessible(true);

    }

    @Test
    @DisplayName("Should handle edge case with all 0xFF session key")
    void testDeriveKeys_AllFFSessionKey() {
        // Given
        byte[] ffSessionKey = new byte[16];
        Arrays.fill(ffSessionKey, (byte) 0xFF);
        int dialect = Smb2Constants.SMB2_DIALECT_0311;

        // When

                buffer[i] = (byte) 0xFF;
            }

            int startIndex = 50;
            echoRequest.writeBytesWireFormat(buffer, startIndex);

            // Check bytes before written area are unchanged
            for (int i = 0; i < startIndex; i++) {
                assertEquals((byte) 0xFF, buffer[i]);
            }

            e.name = readString(buffer, bufferIndex, 16, false);
            bufferIndex += 16;
            e.versionMajor = buffer[bufferIndex] & 0xFF;
            bufferIndex++;
            e.versionMinor = buffer[bufferIndex++] & 0xFF;
            e.type = readInt4(buffer, bufferIndex);
            bufferIndex += 4;
            int off = readInt4(buffer, bufferIndex);
            bufferIndex += 4;

        void testConstructorWithVariousSourceKeys() {
            // Given
            byte[] zeroKey = new byte[SOURCE_KEY_SIZE];
            byte[] maxKey = new byte[SOURCE_KEY_SIZE];
            Arrays.fill(maxKey, (byte) 0xFF);
            byte[] patternKey = new byte[SOURCE_KEY_SIZE];
            for (int i = 0; i < SOURCE_KEY_SIZE; i++) {
                patternKey[i] = (byte) i;
            }

            // When & Then

        bufferIndex += 2;
        if (this.dialectIndex > 10) {
            return bufferIndex - start;
        }
        this.server.securityMode = buffer[bufferIndex] & 0xFF;
        bufferIndex++;
        this.server.security = this.server.securityMode & 0x01;
        this.server.encryptedPasswords = (this.server.securityMode & 0x02) == 0x02;

            }
            // Trivial MIC: 1-byte sum of all unsigned bytes
            int sum = 0;
            for (byte b : data) {
                sum = (sum + (b & 0xFF)) & 0xFF;
            }
            return new byte[] { (byte) sum };
        }

        @Override
        public void verifyMIC(byte[] data, byte[] mic) throws CIFSException {

        }
        final byte[] digest = msgDigest.digest();

        final StringBuilder buffer = new StringBuilder(200);
        for (final byte element : digest) {
            final String tmp = Integer.toHexString(element & 0xff);
            if (tmp.length() == 1) {
                buffer.append('0').append(tmp);
            } else {
                buffer.append(tmp);
            }
        }
        return buffer.toString();
    }

        bufferIndex += 4;
        this.dataDisplacement = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;
        this.setupCount = buffer[bufferIndex] & 0xFF;
        bufferIndex += 2;
        if ((this.setupCount != 0) && log.isDebugEnabled()) {
            log.debug("setupCount is not zero: " + this.setupCount);
        }

        return bufferIndex - start;
    }