1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/types.h>
30
31#include <netinet/in.h>
32
33#include <ctype.h>
34#include <err.h>
35#include <md4.h>
36#include <stdarg.h>
37#include <stdio.h>
38#include <string.h>
39#include <unistd.h>
40
41#include "crypt.h"
42
43/*
44 * NT HASH = md4(str2unicode(pw))
45 */
46
47/* ARGSUSED */
48int
49crypt_nthash(const char *pw, const char *salt __unused, char *buffer)
50{
51	size_t unipwLen;
52	int i;
53	static const char hexconvtab[] = "0123456789abcdef";
54	static const char *magic = "$3$";
55	u_int16_t unipw[128];
56	u_char hash[MD4_SIZE];
57	const char *s;
58	MD4_CTX	ctx;
59
60	bzero(unipw, sizeof(unipw));
61	/* convert to unicode (thanx Archie) */
62	unipwLen = 0;
63	for (s = pw; unipwLen < sizeof(unipw) / 2 && *s; s++)
64		unipw[unipwLen++] = htons(*s << 8);
65
66	/* Compute MD4 of Unicode password */
67	MD4Init(&ctx);
68	MD4Update(&ctx, (u_char *)unipw, unipwLen*sizeof(u_int16_t));
69	MD4Final(hash, &ctx);
70
71	buffer = stpcpy(buffer, magic);
72	*buffer++ = '$';
73	for (i = 0; i < MD4_SIZE; i++) {
74		*buffer++ = hexconvtab[hash[i] >> 4];
75		*buffer++ = hexconvtab[hash[i] & 15];
76	}
77	*buffer = '\0';
78
79	return (0);
80}
81