1 /* 2 * Copyright (c) 1997 - 2000 Kungliga Tekniska H�gskolan 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 1.11 2000/04/06 17:20:26 assar Exp $"); 37 38 static size_t 39 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 static size_t 51 len_int (int val) 52 { 53 size_t ret = 0; 54 55 if (val == 0) 56 return 1; 57 while (val > 255 || val < -255) { 58 ++ret; 59 val /= 256; 60 } 61 if (val != 0) { 62 ++ret; 63 if ((signed char)val != val) 64 ++ret; 65 val /= 256; 66 } 67 return ret; 68 } 69 70 size_t 71 length_len (size_t len) 72 { 73 if (len < 128) 74 return 1; 75 else 76 return len_unsigned (len) + 1; 77 } 78 79 size_t 80 length_integer (const int *data) 81 { 82 size_t len = len_int (*data); 83 84 return 1 + length_len(len) + len; 85 } 86 87 size_t 88 length_unsigned (const unsigned *data) 89 { 90 size_t len = len_unsigned (*data); 91 92 return 1 + length_len(len) + len; 93 } 94 95 size_t 96 length_general_string (const general_string *data) 97 { 98 char *str = *data; 99 size_t len = strlen(str); 100 return 1 + length_len(len) + len; 101 } 102 103 size_t 104 length_octet_string (const octet_string *k) 105 { 106 return 1 + length_len(k->length) + k->length; 107 } 108 109 size_t 110 length_generalized_time (const time_t *t) 111 { 112 octet_string k; 113 size_t ret; 114 115 time2generalizedtime (*t, &k); 116 ret = 1 + length_len(k.length) + k.length; 117 free (k.data); 118 return ret; 119 } 120