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      1 /*	$NetBSD: der_format.c,v 1.2 2017/01/28 21:31:45 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2005 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include "der_locl.h"
     37 #include <krb5/hex.h>
     38 
     39 __RCSID("$NetBSD: der_format.c,v 1.2 2017/01/28 21:31:45 christos Exp $");
     40 
     41 int
     42 der_parse_hex_heim_integer (const char *p, heim_integer *data)
     43 {
     44     ssize_t len;
     45 
     46     data->length = 0;
     47     data->negative = 0;
     48     data->data = NULL;
     49 
     50     if (*p == '-') {
     51 	p++;
     52 	data->negative = 1;
     53     }
     54 
     55     len = strlen(p);
     56     if (len <= 0) {
     57 	data->data = NULL;
     58 	data->length = 0;
     59 	return EINVAL;
     60     }
     61 
     62     data->length = (len / 2) + 1;
     63     data->data = malloc(data->length);
     64     if (data->data == NULL) {
     65 	data->length = 0;
     66 	return ENOMEM;
     67     }
     68 
     69     len = hex_decode(p, data->data, data->length);
     70     if (len < 0) {
     71 	free(data->data);
     72 	data->data = NULL;
     73 	data->length = 0;
     74 	return EINVAL;
     75     }
     76 
     77     {
     78 	unsigned char *q = data->data;
     79 	while(len > 0 && *q == 0) {
     80 	    q++;
     81 	    len--;
     82 	}
     83 	data->length = len;
     84 	memmove(data->data, q, len);
     85     }
     86     return 0;
     87 }
     88 
     89 int
     90 der_print_hex_heim_integer (const heim_integer *data, char **p)
     91 {
     92     ssize_t len;
     93     char *q;
     94 
     95     len = hex_encode(data->data, data->length, p);
     96     if (len < 0)
     97 	return ENOMEM;
     98 
     99     if (data->negative) {
    100 	len = asprintf(&q, "-%s", *p);
    101 	free(*p);
    102 	if (len < 0)
    103 	    return ENOMEM;
    104 	*p = q;
    105     }
    106     return 0;
    107 }
    108 
    109 int
    110 der_print_heim_oid (const heim_oid *oid, char delim, char **str)
    111 {
    112     struct rk_strpool *p = NULL;
    113     size_t i;
    114 
    115     if (oid->length == 0)
    116 	return EINVAL;
    117 
    118     for (i = 0; i < oid->length ; i++) {
    119 	p = rk_strpoolprintf(p, "%d", oid->components[i]);
    120 	if (p && i < oid->length - 1)
    121 	    p = rk_strpoolprintf(p, "%c", delim);
    122 	if (p == NULL) {
    123 	    *str = NULL;
    124 	    return ENOMEM;
    125 	}
    126     }
    127 
    128     *str = rk_strpoolcollect(p);
    129     if (*str == NULL)
    130 	return ENOMEM;
    131     return 0;
    132 }
    133 
    134 int
    135 der_parse_heim_oid (const char *str, const char *sep, heim_oid *data)
    136 {
    137     char *s, *w, *brkt, *endptr;
    138     unsigned int *c;
    139     long l;
    140 
    141     data->length = 0;
    142     data->components = NULL;
    143 
    144     if (sep == NULL)
    145 	sep = ".";
    146 
    147     s = strdup(str);
    148 
    149     for (w = strtok_r(s, sep, &brkt);
    150 	 w != NULL;
    151 	 w = strtok_r(NULL, sep, &brkt)) {
    152 
    153 	c = realloc(data->components,
    154 		    (data->length + 1) * sizeof(data->components[0]));
    155 	if (c == NULL) {
    156 	    der_free_oid(data);
    157 	    free(s);
    158 	    return ENOMEM;
    159 	}
    160 	data->components = c;
    161 
    162 	l = strtol(w, &endptr, 10);
    163 	if (*endptr != '\0' || l < 0 || l > INT_MAX) {
    164 	    der_free_oid(data);
    165 	    free(s);
    166 	    return EINVAL;
    167 	}
    168 	data->components[data->length++] = (unsigned int)l;
    169     }
    170     free(s);
    171     return 0;
    172 }
    173