2 * Copyright (c) 1999 Mark Murray
3 * Copyright (c) 2014 Dag-Erling Smørgrav
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY MARK MURRAY AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL MARK MURRAY OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/types.h>
40 * List of supported crypt(3) formats.
42 * The default algorithm is the last entry in the list (second-to-last
43 * array element since the last is a sentinel). The reason for placing
44 * the default last rather than first is that DES needs to be at the
45 * bottom for the algorithm guessing logic in crypt(3) to work correctly,
46 * and it needs to be the default for backward compatibility.
48 static const struct crypt_format {
49 const char *const name;
50 char *(*const func)(const char *, const char *);
51 const char *const magic;
53 { "md5", crypt_md5, "$1$" },
55 { "blf", crypt_blowfish, "$2" },
57 { "nth", crypt_nthash, "$3$" },
58 { "sha256", crypt_sha256, "$5$" },
59 { "sha512", crypt_sha512, "$6$" },
61 { "des", crypt_des, "_" },
68 static const struct crypt_format *crypt_format =
69 &crypt_formats[(sizeof crypt_formats / sizeof *crypt_formats) - 2];
71 #define DES_SALT_ALPHABET \
72 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
75 * Returns the name of the currently selected format.
78 crypt_get_format(void)
81 return (crypt_format->name);
85 * Selects the format to use for subsequent crypt(3) invocations.
88 crypt_set_format(const char *format)
90 const struct crypt_format *cf;
92 for (cf = crypt_formats; cf->name != NULL; ++cf) {
93 if (strcasecmp(cf->name, format) == 0) {
102 * Hash the given password with the given salt. If the salt begins with a
103 * magic string (e.g. "$6$" for sha512), the corresponding format is used;
104 * otherwise, the currently selected format is used.
107 crypt(const char *passwd, const char *salt)
109 const struct crypt_format *cf;
114 for (cf = crypt_formats; cf->name != NULL; ++cf)
115 if (cf->magic != NULL && strstr(salt, cf->magic) == salt)
116 return (cf->func(passwd, salt));
119 if ((len == 13 || len == 2) && strspn(salt, DES_SALT_ALPHABET) == len)
120 return (crypt_des(passwd, salt));
122 return (crypt_format->func(passwd, salt));