crypto/heimdal-0.6.3/lib/asn1/der_length.c

   1 /*
   2  * Copyright (c) 1997 - 2001 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
  36 RCSID("$Id: der_length.c,v 1.12.6.2 2004/02/12 18:45:51 joda Exp $");
  37
  38 size_t
  39 _heim_len_unsigned (unsigned val)
  40 {
  41   size_t ret = 0;
  42
  43   do {
  44     ++ret;
  45     val /= 256;
  46   } while (val);
  47   return ret;
  48 }
  49
  50 size_t
  51 _heim_len_int (int val)
  52 {
  53     unsigned char q;
  54     size_t ret = 0;
  55
  56     if (val >= 0) {
  57         do {
  58             q = val % 256;
  59             ret++;
  60             val /= 256;
  61         } while(val);
  62         if(q >= 128)
  63             ret++;
  64     } else {
  65         val = ~val;
  66         do {
  67             q = ~(val % 256);
  68             ret++;
  69             val /= 256;
  70         } while(val);
  71         if(q < 128)
  72             ret++;
  73     }
  74     return ret;
  75 }
  76
  77 static size_t
  78 len_oid (const oid *oid)
  79 {
  80     size_t ret = 1;
  81     int n;
  82
  83     for (n = 2; n < oid->length; ++n) {
  84         unsigned u = oid->components[n];
  85
  86         ++ret;
  87         u /= 128;
  88         while (u > 0) {
  89             ++ret;
  90             u /= 128;
  91         }
  92     }
  93     return ret;
  94 }
  95
  96 size_t
  97 length_len (size_t len)
  98 {
  99     if (len < 128)
 100         return 1;
 101     else
 102         return _heim_len_unsigned (len) + 1;
 103 }
 104
 105 size_t
 106 length_integer (const int *data)
 107 {
 108     size_t len = _heim_len_int (*data);
 109
 110   return 1 + length_len(len) + len;
 111 }
 112
 113 size_t
 114 length_unsigned (const unsigned *data)
 115 {
 116   size_t len = _heim_len_unsigned (*data);
 117
 118   return 1 + length_len(len) + len;
 119 }
 120
 121 size_t
 122 length_enumerated (const unsigned *data)
 123 {
 124     size_t len = _heim_len_int (*data);
 125
 126   return 1 + length_len(len) + len;
 127 }
 128
 129 size_t
 130 length_general_string (const general_string *data)
 131 {
 132   char *str = *data;
 133   size_t len = strlen(str);
 134   return 1 + length_len(len) + len;
 135 }
 136
 137 size_t
 138 length_octet_string (const octet_string *k)
 139 {
 140   return 1 + length_len(k->length) + k->length;
 141 }
 142
 143 size_t
 144 length_oid (const oid *k)
 145 {
 146   size_t len = len_oid (k);
 147
 148   return 1 + length_len(len) + len;
 149 }
 150
 151 size_t
 152 length_generalized_time (const time_t *t)
 153 {
 154   octet_string k;
 155   size_t ret;
 156
 157   time2generalizedtime (*t, &k);
 158   ret = 1 + length_len(k.length) + k.length;
 159   free (k.data);
 160   return ret;
 161 }