2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1999 Mark Murray
5 * Copyright (c) 2014 Dag-Erling Smørgrav
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY MARK MURRAY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL MARK MURRAY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/types.h>
42 * List of supported crypt(3) formats.
44 * The default algorithm is the last entry in the list (second-to-last
45 * array element since the last is a sentinel). The reason for placing
46 * the default last rather than first is that DES needs to be at the
47 * bottom for the algorithm guessing logic in crypt(3) to work correctly,
48 * and it needs to be the default for backward compatibility.
50 static const struct crypt_format {
52 int (*func)(const char *, const char *, char *);
55 { "md5", crypt_md5, "$1$" },
57 { "blf", crypt_blowfish, "$2" },
59 { "nth", crypt_nthash, "$3$" },
60 { "sha256", crypt_sha256, "$5$" },
61 { "sha512", crypt_sha512, "$6$" },
63 { "des", crypt_des, "_" },
70 static const struct crypt_format *crypt_format =
71 &crypt_formats[(sizeof crypt_formats / sizeof *crypt_formats) - 2];
73 #define DES_SALT_ALPHABET \
74 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
77 * Returns the name of the currently selected format.
80 crypt_get_format(void)
83 return (crypt_format->name);
87 * Selects the format to use for subsequent crypt(3) invocations.
90 crypt_set_format(const char *format)
92 const struct crypt_format *cf;
94 for (cf = crypt_formats; cf->name != NULL; ++cf) {
95 if (strcasecmp(cf->name, format) == 0) {
104 * Hash the given password with the given salt. If the salt begins with a
105 * magic string (e.g. "$6$" for sha512), the corresponding format is used;
106 * otherwise, the currently selected format is used.
109 crypt_r(const char *passwd, const char *salt, struct crypt_data *data)
111 const struct crypt_format *cf;
112 int (*func)(const char *, const char *, char *);
117 for (cf = crypt_formats; cf->name != NULL; ++cf)
118 if (cf->magic != NULL && strstr(salt, cf->magic) == salt) {
124 if ((len == 13 || len == 2) && strspn(salt, DES_SALT_ALPHABET) == len) {
129 func = crypt_format->func;
131 if (func(passwd, salt, data->__buf) != 0)
133 return (data->__buf);
137 crypt(const char *passwd, const char *salt)
139 static struct crypt_data data;
141 return (crypt_r(passwd, salt, &data));