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util.c revision 1.3 
      1  1.3  nia /*	$NetBSD: util.c,v 1.3 2021/10/12 15:25:39 nia Exp $	*/
      2  1.2  nia /*
      3  1.2  nia  * Copyright 1997 Niels Provos <provos (at) physnet.uni-hamburg.de>
      4  1.2  nia  * All rights reserved.
      5  1.2  nia  *
      6  1.2  nia  * Redistribution and use in source and binary forms, with or without
      7  1.2  nia  * modification, are permitted provided that the following conditions
      8  1.2  nia  * are met:
      9  1.2  nia  * 1. Redistributions of source code must retain the above copyright
     10  1.2  nia  *    notice, this list of conditions and the following disclaimer.
     11  1.2  nia  * 2. Redistributions in binary form must reproduce the above copyright
     12  1.2  nia  *    notice, this list of conditions and the following disclaimer in the
     13  1.2  nia  *    documentation and/or other materials provided with the distribution.
     14  1.2  nia  * 3. All advertising materials mentioning features or use of this software
     15  1.2  nia  *    must display the following acknowledgement:
     16  1.2  nia  *      This product includes software developed by Niels Provos.
     17  1.2  nia  * 4. The name of the author may not be used to endorse or promote products
     18  1.2  nia  *    derived from this software without specific prior written permission.
     19  1.2  nia  *
     20  1.2  nia  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  1.2  nia  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  1.2  nia  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  1.2  nia  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  1.2  nia  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  1.2  nia  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  1.2  nia  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  1.2  nia  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  1.2  nia  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  1.2  nia  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  1.2  nia  */
     31  1.1  sjg #include <sys/cdefs.h>
     32  1.1  sjg #if !defined(lint)
     33  1.3  nia __RCSID("$NetBSD: util.c,v 1.3 2021/10/12 15:25:39 nia Exp $");
     34  1.1  sjg #endif /* not lint */
     35  1.1  sjg 
     36  1.1  sjg #include <sys/types.h>
     37  1.2  nia #include <errno.h>
     38  1.2  nia #include <limits.h>
     39  1.2  nia #include <stddef.h>
     40  1.2  nia #include <stdlib.h>
     41  1.1  sjg 
     42  1.1  sjg #include "crypt.h"
     43  1.1  sjg 
     44  1.3  nia /* traditional unix "B64" encoding */
     45  1.1  sjg static const unsigned char itoa64[] =		/* 0 ... 63 => ascii - 64 */
     46  1.1  sjg 	"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
     47  1.1  sjg 
     48  1.3  nia /* standard base64 encoding, used by Argon2 */
     49  1.3  nia static const unsigned char itoabase64[] =
     50  1.3  nia 	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
     51  1.3  nia 
     52  1.2  nia crypt_private int
     53  1.2  nia getnum(const char *str, size_t *num)
     54  1.2  nia {
     55  1.2  nia 	char *ep;
     56  1.2  nia 	unsigned long rv;
     57  1.2  nia 
     58  1.2  nia 	if (str == NULL) {
     59  1.2  nia 		*num = 0;
     60  1.2  nia 		return 0;
     61  1.2  nia 	}
     62  1.2  nia 
     63  1.2  nia 	rv = strtoul(str, &ep, 0);
     64  1.2  nia 
     65  1.2  nia 	if (str == ep || *ep) {
     66  1.2  nia 		errno = EINVAL;
     67  1.2  nia 		return -1;
     68  1.2  nia 	}
     69  1.2  nia 
     70  1.2  nia 	if (errno == ERANGE && rv == ULONG_MAX)
     71  1.2  nia 		return -1;
     72  1.2  nia 	*num = (size_t)rv;
     73  1.2  nia 	return 0;
     74  1.2  nia }
     75  1.2  nia 
     76  1.3  nia crypt_private void
     77  1.2  nia __crypt_to64(char *s, uint32_t v, int n)
     78  1.1  sjg {
     79  1.1  sjg 
     80  1.1  sjg 	while (--n >= 0) {
     81  1.1  sjg 		*s++ = itoa64[v & 0x3f];
     82  1.1  sjg 		v >>= 6;
     83  1.1  sjg 	}
     84  1.1  sjg }
     85  1.3  nia 
     86  1.3  nia crypt_private void
     87  1.3  nia __crypt_tobase64(char *s, uint32_t v, int n)
     88  1.3  nia {
     89  1.3  nia 
     90  1.3  nia 	while (--n >= 0) {
     91  1.3  nia 		*s++ = itoabase64[v & 0x3f];
     92  1.3  nia 		v >>= 6;
     93  1.3  nia 	}
     94  1.3  nia }
     95