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 "cifspdu.h"
24#include "cifsglob.h"
25#include "cifs_debug.h"
26#include "cifsproto.h"
27#include "../common/md4.h"
28
29/* following came from the other byteorder.h to avoid include conflicts */
30#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
31#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
32#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
33
34/* produce a md4 message digest from data of length n bytes */
35static int
36mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
37{
38 int rc;
39 struct md4_ctx mctx;
40
41 rc = cifs_md4_init(mctx: &mctx);
42 if (rc) {
43 cifs_dbg(VFS, "%s: Could not init MD4\n", __func__);
44 goto mdfour_err;
45 }
46 rc = cifs_md4_update(mctx: &mctx, data: link_str, len: link_len);
47 if (rc) {
48 cifs_dbg(VFS, "%s: Could not update MD4\n", __func__);
49 goto mdfour_err;
50 }
51 rc = cifs_md4_final(mctx: &mctx, out: md4_hash);
52 if (rc)
53 cifs_dbg(VFS, "%s: Could not finalize MD4\n", __func__);
54
55
56mdfour_err:
57 return rc;
58}
59
60/*
61 * Creates the MD4 Hash of the users password in NT UNICODE.
62 */
63
64int
65E_md4hash(const unsigned char *passwd, unsigned char *p16,
66 const struct nls_table *codepage)
67{
68 int rc;
69 int len;
70 __le16 wpwd[129];
71
72 /* Password cannot be longer than 128 characters */
73 if (passwd) /* Password must be converted to NT unicode */
74 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
75 else {
76 len = 0;
77 *wpwd = 0; /* Ensure string is null terminated */
78 }
79
80 rc = mdfour(md4_hash: p16, link_str: (unsigned char *) wpwd, link_len: len * sizeof(__le16));
81 memzero_explicit(s: wpwd, count: sizeof(wpwd));
82
83 return rc;
84}
85

source code of linux/fs/smb/client/smbencrypt.c