security/nss/lib/util/oidstring.c

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Mozilla Public License Version
   5  * 1.1 (the "License"); you may not use this file except in compliance with
   6  * the License. You may obtain a copy of the License at
   7  * http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS" basis,
  10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11  * for the specific language governing rights and limitations under the
  12  * License.
  13  *
  14  * The Original Code is the Network Security Services.
  15  *
  16  * The Initial Developer of the Original Code is Nelson B Bolyard
  17  * Portions created by the Initial Developer are Copyright (C) 2007
  18  * the Initial Developer. All Rights Reserved.
  19  *
  20  * Contributor(s):
  21  *
  22  * Alternatively, the contents of this file may be used under the terms of
  23  * either the GNU General Public License Version 2 or later (the "GPL"), or
  24  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  25  * in which case the provisions of the GPL or the LGPL are applicable instead
  26  * of those above. If you wish to allow use of your version of this file only
  27  * under the terms of either the GPL or the LGPL, and not to allow others to
  28  * use your version of this file under the terms of the MPL, indicate your
  29  * decision by deleting the provisions above and replace them with the notice
  30  * and other provisions required by the GPL or the LGPL. If you do not delete
  31  * the provisions above, a recipient may use your version of this file under
  32  * the terms of any one of the MPL, the GPL or the LGPL.
  33  *
  34  * ***** END LICENSE BLOCK ***** */
  35
  36 #include <string.h>
  37 #include "secitem.h"
  38 #include "secport.h"
  39 #include "secerr.h"
  40
  41 /* if to->data is not NULL, and to->len is large enough to hold the result,
  42  * then the resultant OID will be copyed into to->data, and to->len will be
  43  * changed to show the actual OID length.
  44  * Otherwise, memory for the OID will be allocated (from the caller's
  45  * PLArenaPool, if pool is non-NULL) and to->data will receive the address
  46  * of the allocated data, and to->len will receive the OID length.
  47  * The original value of to->data is not freed when a new buffer is allocated.
  48  *
  49  * The input string may begin with "OID." and this still be ignored.
  50  * The length of the input string is given in len.  If len == 0, then
  51  * len will be computed as strlen(from), meaning it must be NUL terminated.
  52  * It is an error if from == NULL, or if *from == '\0'.
  53  */
  54
  55 SECStatus
  56 SEC_StringToOID(PLArenaPool *pool, SECItem *to, const char *from, PRUint32 len)
  57 {
  58     PRUint32 decimal_numbers = 0;
  59     PRUint32 result_bytes = 0;
  60     SECStatus rv;
  61     PRUint8 result[1024];
  62
  63     static const PRUint32 max_decimal = (0xffffffff / 10);
  64     static const char OIDstring[] = {"OID."};
  65
  66     if (!from || !to) {
  67         PORT_SetError(SEC_ERROR_INVALID_ARGS);
  68         return SECFailure;
  69     }
  70     if (!len) {
  71         len = PL_strlen(from);
  72     }
  73     if (len >= 4 && !PL_strncasecmp(from, OIDstring, 4)) {
  74         from += 4; /* skip leading "OID." if present */
  75         len  -= 4;
  76     }
  77     if (!len) {
  78 bad_data:
  79         PORT_SetError(SEC_ERROR_BAD_DATA);
  80         return SECFailure;
  81     }
  82     do {
  83         PRUint32 decimal = 0;
  84         while (len > 0 && isdigit(*from)) {
  85             PRUint32 addend = (*from++ - '0');
  86             --len;
  87             if (decimal > max_decimal)  /* overflow */
  88                 goto bad_data;
  89             decimal = (decimal * 10) + addend;
  90             if (decimal < addend)       /* overflow */
  91                 goto bad_data;
  92         }
  93         if (len != 0 && *from != '.') {
  94             goto bad_data;
  95         }
  96         if (decimal_numbers == 0) {
  97             if (decimal > 2)
  98                 goto bad_data;
  99             result[0] = decimal * 40;
 100             result_bytes = 1;
 101         } else if (decimal_numbers == 1) {
 102             if (decimal > 40)
 103                 goto bad_data;
 104             result[0] += decimal;
 105         } else {
 106             /* encode the decimal number,  */
 107             PRUint8 * rp;
 108             PRUint32 num_bytes = 0;
 109             PRUint32 tmp = decimal;
 110             while (tmp) {
 111                 num_bytes++;
 112                 tmp >>= 7;
 113             }
 114             if (!num_bytes )
 115                 ++num_bytes;  /* use one byte for a zero value */
 116             if (num_bytes + result_bytes > sizeof result)
 117                 goto bad_data;
 118             tmp = num_bytes;
 119             rp = result + result_bytes - 1;
 120             rp[tmp] = (PRUint8)(decimal & 0x7f);
 121             decimal >>= 7;
 122             while (--tmp > 0) {
 123                 rp[tmp] = (PRUint8)(decimal | 0x80);
 124                 decimal >>= 7;
 125             }
 126             result_bytes += num_bytes;
 127         }
 128         ++decimal_numbers;
 129         if (len > 0) { /* skip trailing '.' */
 130             ++from;
 131             --len;
 132         }
 133     } while (len > 0);
 134     /* now result contains result_bytes of data */
 135     if (to->data && to->len >= result_bytes) {
 136         PORT_Memcpy(to->data, result, to->len = result_bytes);
 137         rv = SECSuccess;
 138     } else {
 139         SECItem result_item = {siBuffer, NULL, 0 };
 140         result_item.data = result;
 141         result_item.len  = result_bytes;
 142         rv = SECITEM_CopyItem(pool, to, &result_item);
 143     }
 144     return rv;
 145 }