1 /*
2 * MIT License
3 *
4 * Copyright (c) 2010-2024 The Waffle Project Contributors: https://github.com/Waffle/waffle/graphs/contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24 package waffle.util;
25
26 /**
27 * Rudimentary NTLM message utility.
28 */
29 public final class NtlmMessage {
30
31 // NTLM messages start with 0x4e544c4d53535000, NTLMSSP signature
32 /** The Constant NTLM_SSP_SIGNATURE. */
33 private static final byte[] NTLM_SSP_SIGNATURE = { 0x4e, 0x54, 0x4c, 0x4d, 0x53, 0x53, 0x50, 0x00 };
34
35 /**
36 * Checks if is ntlm message.
37 *
38 * @param message
39 * the message
40 *
41 * @return true, if is ntlm message
42 */
43 public static boolean isNtlmMessage(final byte[] message) {
44 if (message == null || message.length < NtlmMessage.NTLM_SSP_SIGNATURE.length) {
45 return false;
46 }
47
48 for (int i = 0; i < NtlmMessage.NTLM_SSP_SIGNATURE.length; i++) {
49 if (NtlmMessage.NTLM_SSP_SIGNATURE[i] != message[i]) {
50 return false;
51 }
52 }
53
54 return true;
55 }
56
57 /**
58 * Get NTLM message type.
59 *
60 * @param message
61 * Assuming a valid NTLM message.
62 *
63 * @return Message type.
64 */
65 public static int getMessageType(final byte[] message) {
66 return message[NtlmMessage.NTLM_SSP_SIGNATURE.length];
67 }
68
69 /**
70 * Instantiates a new ntlm message.
71 */
72 private NtlmMessage() {
73 // Prevent Instantiation of object
74 }
75 }