1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2003 Michael Bretterklieber
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33
34#include <netinet/in.h>
35
36#include <ctype.h>
37#include <err.h>
38#include <md4.h>
39#include <stdarg.h>
40#include <stdio.h>
41#include <string.h>
42#include <unistd.h>
43
44#include "crypt.h"
45
46/*
47 * NT HASH = md4(str2unicode(pw))
48 */
49
50/* ARGSUSED */
51int
52crypt_nthash(const char *pw, const char *salt __unused, char *buffer)
53{
54	size_t unipwLen;
55	int i;
56	static const char hexconvtab[] = "0123456789abcdef";
57	static const char *magic = "$3$";
58	u_int16_t unipw[128];
59	u_char hash[MD4_SIZE];
60	const char *s;
61	MD4_CTX	ctx;
62
63	bzero(unipw, sizeof(unipw));
64	/* convert to unicode (thanx Archie) */
65	unipwLen = 0;
66	for (s = pw; unipwLen < sizeof(unipw) / 2 && *s; s++)
67		unipw[unipwLen++] = htons(*s << 8);
68
69	/* Compute MD4 of Unicode password */
70 	MD4Init(&ctx);
71	MD4Update(&ctx, (u_char *)unipw, unipwLen*sizeof(u_int16_t));
72	MD4Final(hash, &ctx);
73
74	buffer = stpcpy(buffer, magic);
75	*buffer++ = '$';
76	for (i = 0; i < MD4_SIZE; i++) {
77		*buffer++ = hexconvtab[hash[i] >> 4];
78		*buffer++ = hexconvtab[hash[i] & 15];
79	}
80	*buffer = '\0';
81
82	return (0);
83}
84