crypt.c revision 238481 
1/*
2 * Copyright (c) 1999
3 *      Mark Murray.  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 MARK MURRAY 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 MARK MURRAY 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: stable/9/lib/libcrypt/crypt.c 238481 2012-07-15 11:39:35Z des $");
29
30#include <sys/types.h>
31#include <string.h>
32#include <libutil.h>
33#include <unistd.h>
34#include "crypt.h"
35
36static const struct {
37	const char *const name;
38	char *(*const func)(const char *, const char *);
39	const char *const magic;
40} crypt_types[] = {
41#ifdef HAS_DES
42	{
43		"des",
44		crypt_des,
45		NULL
46	},
47#endif
48	{
49		"md5",
50		crypt_md5,
51		"$1$"
52	},
53#ifdef HAS_BLOWFISH
54	{
55		"blf",
56		crypt_blowfish,
57		"$2"
58	},
59#endif
60	{
61		"nth",
62		crypt_nthash,
63		"$3$"
64	},
65	{
66		"sha256",
67		crypt_sha256,
68		"$5$"
69	},
70	{
71		"sha512",
72		crypt_sha512,
73		"$6$"
74	},
75	{
76		NULL,
77		NULL,
78		NULL
79	}
80};
81
82#ifdef HAS_DES
83#define CRYPT_DEFAULT	"des"
84#else
85#define CRYPT_DEFAULT	"md5"
86#endif
87
88static int crypt_type = -1;
89
90static void
91crypt_setdefault(void)
92{
93	size_t i;
94
95	if (crypt_type != -1)
96		return;
97	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
98		if (strcmp(CRYPT_DEFAULT, crypt_types[i].name) == 0) {
99			crypt_type = (int)i;
100			return;
101		}
102	}
103	crypt_type = 0;
104}
105
106const char *
107crypt_get_format(void)
108{
109
110	crypt_setdefault();
111	return (crypt_types[crypt_type].name);
112}
113
114int
115crypt_set_format(const char *type)
116{
117	size_t i;
118
119	crypt_setdefault();
120	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
121		if (strcmp(type, crypt_types[i].name) == 0) {
122			crypt_type = (int)i;
123			return (1);
124		}
125	}
126	return (0);
127}
128
129char *
130crypt(const char *passwd, const char *salt)
131{
132	size_t i;
133
134	crypt_setdefault();
135	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
136		if (crypt_types[i].magic != NULL && strncmp(salt,
137		    crypt_types[i].magic, strlen(crypt_types[i].magic)) == 0)
138			return (crypt_types[i].func(passwd, salt));
139	}
140	return (crypt_types[crypt_type].func(passwd, salt));
141}
142