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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 Unix SMB/Netbios implementation.
4 Version 1.9.
5 SMB parameters and setup
6 Copyright (C) Andrew Tridgell 1992-2000
7 Copyright (C) Luke Kenneth Casson Leighton 1996-2000
8 Modified by Jeremy Allison 1995.
9 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
10 Modified by Steve French (sfrench@us.ibm.com) 2002-2003
11
12*/
13
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/fips.h>
17#include <linux/fs.h>
18#include <linux/string.h>
19#include <linux/kernel.h>
20#include <linux/random.h>
21#include "cifs_fs_sb.h"
22#include "cifs_unicode.h"
23#include "cifsglob.h"
24#include "cifs_debug.h"
25#include "cifsproto.h"
26#include "../common/md4.h"
27
28/* following came from the other byteorder.h to avoid include conflicts */
29#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
30#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
31#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
32
33/* produce a md4 message digest from data of length n bytes */
34static int
35mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
36{
37 int rc;
38 struct md4_ctx mctx;
39
40 rc = cifs_md4_init(&mctx);
41 if (rc) {
42 cifs_dbg(VFS, "%s: Could not init MD4\n", __func__);
43 goto mdfour_err;
44 }
45 rc = cifs_md4_update(&mctx, link_str, link_len);
46 if (rc) {
47 cifs_dbg(VFS, "%s: Could not update MD4\n", __func__);
48 goto mdfour_err;
49 }
50 rc = cifs_md4_final(&mctx, md4_hash);
51 if (rc)
52 cifs_dbg(VFS, "%s: Could not finalize MD4\n", __func__);
53
54
55mdfour_err:
56 return rc;
57}
58
59/*
60 * Creates the MD4 Hash of the users password in NT UNICODE.
61 */
62
63int
64E_md4hash(const unsigned char *passwd, unsigned char *p16,
65 const struct nls_table *codepage)
66{
67 int rc;
68 int len;
69 __le16 wpwd[129];
70
71 /* Password cannot be longer than 128 characters */
72 if (passwd) /* Password must be converted to NT unicode */
73 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
74 else {
75 len = 0;
76 *wpwd = 0; /* Ensure string is null terminated */
77 }
78
79 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
80 memzero_explicit(wpwd, sizeof(wpwd));
81
82 return rc;
83}