lib/asn1/der_format.c

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