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      1 /*	$NetBSD: util.c,v 1.3 2021/10/12 15:25:39 nia Exp $	*/
      2 /*
      3  * Copyright 1997 Niels Provos <provos (at) 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
     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
     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
     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