lib/asn1/der_length.c

   1 /*
   2  * Copyright (c) 1997-2005 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
  36 RCSID("$Id$");
  37
  38 size_t
  39 _heim_len_unsigned (unsigned val)
  40 {
  41     size_t ret = 0;
  42     int last_val_gt_128;
  43
  44     do {
  45         ++ret;
  46         last_val_gt_128 = (val >= 128);
  47         val /= 256;
  48     } while (val);
  49
  50     if(last_val_gt_128)
  51         ret++;
  52
  53     return ret;
  54 }
  55
  56 size_t
  57 _heim_len_int (int val)
  58 {
  59     unsigned char q;
  60     size_t ret = 0;
  61
  62     if (val >= 0) {
  63         do {
  64             q = val % 256;
  65             ret++;
  66             val /= 256;
  67         } while(val);
  68         if(q >= 128)
  69             ret++;
  70     } else {
  71         val = ~val;
  72         do {
  73             q = ~(val % 256);
  74             ret++;
  75             val /= 256;
  76         } while(val);
  77         if(q < 128)
  78             ret++;
  79     }
  80     return ret;
  81 }
  82
  83 static size_t
  84 len_oid (const heim_oid *oid)
  85 {
  86     size_t ret = 1;
  87     int n;
  88
  89     for (n = 2; n < oid->length; ++n) {
  90         unsigned u = oid->components[n];
  91
  92         do {
  93             ++ret;
  94             u /= 128;
  95         } while(u > 0);
  96     }
  97     return ret;
  98 }
  99
 100 size_t
 101 der_length_len (size_t len)
 102 {
 103     if (len < 128)
 104         return 1;
 105     else {
 106         int ret = 0;
 107         do {
 108             ++ret;
 109             len /= 256;
 110         } while (len);
 111         return ret + 1;
 112     }
 113 }
 114
 115 size_t
 116 der_length_integer (const int *data)
 117 {
 118     return _heim_len_int (*data);
 119 }
 120
 121 size_t
 122 der_length_unsigned (const unsigned *data)
 123 {
 124     return _heim_len_unsigned(*data);
 125 }
 126
 127 size_t
 128 der_length_enumerated (const unsigned *data)
 129 {
 130   return _heim_len_int (*data);
 131 }
 132
 133 size_t
 134 der_length_general_string (const heim_general_string *data)
 135 {
 136     return strlen(*data);
 137 }
 138
 139 size_t
 140 der_length_utf8string (const heim_utf8_string *data)
 141 {
 142     return strlen(*data);
 143 }
 144
 145 size_t
 146 der_length_printable_string (const heim_printable_string *data)
 147 {
 148     return strlen(*data);
 149 }
 150
 151 size_t
 152 der_length_ia5_string (const heim_ia5_string *data)
 153 {
 154     return strlen(*data);
 155 }
 156
 157 size_t
 158 der_length_bmp_string (const heim_bmp_string *data)
 159 {
 160     return data->length * 2;
 161 }
 162
 163 size_t
 164 der_length_universal_string (const heim_universal_string *data)
 165 {
 166     return data->length * 4;
 167 }
 168
 169 size_t
 170 der_length_visible_string (const heim_visible_string *data)
 171 {
 172     return strlen(*data);
 173 }
 174
 175 size_t
 176 der_length_octet_string (const heim_octet_string *k)
 177 {
 178     return k->length;
 179 }
 180
 181 size_t
 182 der_length_heim_integer (const heim_integer *k)
 183 {
 184     if (k->length == 0)
 185         return 1;
 186     if (k->negative)
 187         return k->length + (((~(((unsigned char *)k->data)[0])) & 0x80) ? 0 : 1);
 188     else
 189         return k->length + ((((unsigned char *)k->data)[0] & 0x80) ? 1 : 0);
 190 }
 191
 192 size_t
 193 der_length_oid (const heim_oid *k)
 194 {
 195     return len_oid (k);
 196 }
 197
 198 size_t
 199 der_length_generalized_time (const time_t *t)
 200 {
 201     heim_octet_string k;
 202     size_t ret;
 203
 204     _heim_time2generalizedtime (*t, &k, 1);
 205     ret = k.length;
 206     free(k.data);
 207     return ret;
 208 }
 209
 210 size_t
 211 der_length_utctime (const time_t *t)
 212 {
 213     heim_octet_string k;
 214     size_t ret;
 215
 216     _heim_time2generalizedtime (*t, &k, 0);
 217     ret = k.length;
 218     free(k.data);
 219     return ret;
 220 }
 221
 222 size_t
 223 der_length_boolean (const int *k)
 224 {
 225     return 1;
 226 }
 227
 228 size_t
 229 der_length_bit_string (const heim_bit_string *k)
 230 {
 231     return (k->length + 7) / 8 + 1;
 232 }