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 "../smbfs_common/md4.h"
28
29#ifndef false
30#define false 0
31#endif
32#ifndef true
33#define true 1
34#endif
35
36/* following came from the other byteorder.h to avoid include conflicts */
37#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
38#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
39#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
40
41/* produce a md4 message digest from data of length n bytes */
42static int
43mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
44{
45	int rc;
46	struct md4_ctx mctx;
47
48	rc = cifs_md4_init(&mctx);
49	if (rc) {
50		cifs_dbg(VFS, "%s: Could not init MD4\n", __func__);
51		goto mdfour_err;
52	}
53	rc = cifs_md4_update(&mctx, link_str, link_len);
54	if (rc) {
55		cifs_dbg(VFS, "%s: Could not update MD4\n", __func__);
56		goto mdfour_err;
57	}
58	rc = cifs_md4_final(&mctx, md4_hash);
59	if (rc)
60		cifs_dbg(VFS, "%s: Could not finalize MD4\n", __func__);
61
62
63mdfour_err:
64	return rc;
65}
66
67/*
68 * Creates the MD4 Hash of the users password in NT UNICODE.
69 */
70
71int
72E_md4hash(const unsigned char *passwd, unsigned char *p16,
73	const struct nls_table *codepage)
74{
75	int rc;
76	int len;
77	__le16 wpwd[129];
78
79	/* Password cannot be longer than 128 characters */
80	if (passwd) /* Password must be converted to NT unicode */
81		len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
82	else {
83		len = 0;
84		*wpwd = 0; /* Ensure string is null terminated */
85	}
86
87	rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
88	memzero_explicit(wpwd, sizeof(wpwd));
89
90	return rc;
91}