xref: /freebsd/lib/libcrypt/crypt.c (revision 0fcefb433d1265c4e6d4275eae7478cda1bf6a34)
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("$FreeBSD$");
29 
30 #include <sys/types.h>
31 #include <string.h>
32 #include <libutil.h>
33 #include <unistd.h>
34 #include "crypt.h"
35 
36 static 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 #define CRYPT_DEFAULT	"sha512"
83 
84 static int crypt_type = -1;
85 
86 static void
87 crypt_setdefault(void)
88 {
89 	size_t i;
90 
91 	if (crypt_type != -1)
92 		return;
93 	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
94 		if (strcmp(CRYPT_DEFAULT, crypt_types[i].name) == 0) {
95 			crypt_type = (int)i;
96 			return;
97 		}
98 	}
99 	crypt_type = 0;
100 }
101 
102 const char *
103 crypt_get_format(void)
104 {
105 
106 	crypt_setdefault();
107 	return (crypt_types[crypt_type].name);
108 }
109 
110 int
111 crypt_set_format(const char *type)
112 {
113 	size_t i;
114 
115 	crypt_setdefault();
116 	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
117 		if (strcmp(type, crypt_types[i].name) == 0) {
118 			crypt_type = (int)i;
119 			return (1);
120 		}
121 	}
122 	return (0);
123 }
124 
125 char *
126 crypt(const char *passwd, const char *salt)
127 {
128 	size_t i;
129 
130 	crypt_setdefault();
131 	for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
132 		if (crypt_types[i].magic != NULL && strncmp(salt,
133 		    crypt_types[i].magic, strlen(crypt_types[i].magic)) == 0)
134 			return (crypt_types[i].func(passwd, salt));
135 	}
136 	return (crypt_types[crypt_type].func(passwd, salt));
137 }
138