1/*-
2 * Copyright (c) 2003 Michael Bretterklieber
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/types.h>
31
32#include <netinet/in.h>
33
34#include <ctype.h>
35#include <err.h>
36#include <md4.h>
37#include <stdarg.h>
38#include <stdio.h>
39#include <string.h>
40#include <unistd.h>
41
42#include "crypt.h"
43
44/*
45 * NT HASH = md4(str2unicode(pw))
46 */
47
48/* ARGSUSED */
49char *
50crypt_nthash(const char *pw, const char *salt __unused)
51{
52	size_t unipwLen;
53	int i, j;
54	static char hexconvtab[] = "0123456789abcdef";
55	static const char *magic = "$3$";
56	static char passwd[120];
57	u_int16_t unipw[128];
58	char final[MD4_SIZE*2 + 1];
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	for (i = j = 0; i < MD4_SIZE; i++) {
75		final[j++] = hexconvtab[hash[i] >> 4];
76		final[j++] = hexconvtab[hash[i] & 15];
77	}
78	final[j] = '\0';
79
80	strcpy(passwd, magic);
81	strcat(passwd, "$");
82	strncat(passwd, final, MD4_SIZE*2);
83
84	/* Don't leave anything around in vm they could use. */
85	memset(final, 0, sizeof(final));
86
87	return (passwd);
88}
89