1 /* $NetBSD: util.c,v 1.3 2021/10/12 15:25:39 nia Exp $ */
2 /*
3 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Niels Provos.
17 * 4. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 #if !defined(lint)
33 __RCSID("$NetBSD: util.c,v 1.3 2021/10/12 15:25:39 nia Exp $");
34 #endif /* not lint */
35
36 #include <sys/types.h>
37 #include <errno.h>
38 #include <limits.h>
39 #include <stddef.h>
40 #include <stdlib.h>
41
42 #include "crypt.h"
43
44 /* traditional unix "B64" encoding */
45 static const unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
46 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
47
48 /* standard base64 encoding, used by Argon2 */
49 static const unsigned char itoabase64[] =
50 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
51
52 crypt_private int
getnum(const char * str,size_t * num)53 getnum(const char *str, size_t *num)
54 {
55 char *ep;
56 unsigned long rv;
57
58 if (str == NULL) {
59 *num = 0;
60 return 0;
61 }
62
63 rv = strtoul(str, &ep, 0);
64
65 if (str == ep || *ep) {
66 errno = EINVAL;
67 return -1;
68 }
69
70 if (errno == ERANGE && rv == ULONG_MAX)
71 return -1;
72 *num = (size_t)rv;
73 return 0;
74 }
75
76 crypt_private void
__crypt_to64(char * s,uint32_t v,int n)77 __crypt_to64(char *s, uint32_t v, int n)
78 {
79
80 while (--n >= 0) {
81 *s++ = itoa64[v & 0x3f];
82 v >>= 6;
83 }
84 }
85
86 crypt_private void
__crypt_tobase64(char * s,uint32_t v,int n)87 __crypt_tobase64(char *s, uint32_t v, int n)
88 {
89
90 while (--n >= 0) {
91 *s++ = itoabase64[v & 0x3f];
92 v >>= 6;
93 }
94 }
95