crypto/asn1/asn_pack.c

   1 /* asn_pack.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/asn1.h>
  62
  63 #ifndef NO_ASN1_OLD
  64
  65 /* ASN1 packing and unpacking functions */
  66
  67 /* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */
  68
  69 STACK *ASN1_seq_unpack(const unsigned char *buf, int len,
  70                        d2i_of_void *d2i,void (*free_func)(void *))
  71 {
  72     STACK *sk;
  73     const unsigned char *pbuf;
  74     pbuf =  buf;
  75     if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,
  76                                         V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL)))
  77                  ASN1err(ASN1_F_ASN1_SEQ_UNPACK,ASN1_R_DECODE_ERROR);
  78     return sk;
  79 }
  80
  81 /* Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a
  82  * OPENSSL_malloc'ed buffer
  83  */
  84
  85 unsigned char *ASN1_seq_pack(STACK *safes, int (*i2d)(void *,unsigned char **),
  86                              unsigned char **buf, int *len)
  87 {
  88         int safelen;
  89         unsigned char *safe, *p;
  90         if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE,
  91                                               V_ASN1_UNIVERSAL, IS_SEQUENCE))) {
  92                 ASN1err(ASN1_F_ASN1_SEQ_PACK,ASN1_R_ENCODE_ERROR);
  93                 return NULL;
  94         }
  95         if (!(safe = OPENSSL_malloc (safelen))) {
  96                 ASN1err(ASN1_F_ASN1_SEQ_PACK,ERR_R_MALLOC_FAILURE);
  97                 return NULL;
  98         }
  99         p = safe;
 100         i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL,
 101                                                                  IS_SEQUENCE);
 102         if (len) *len = safelen;
 103         if (buf) *buf = safe;
 104         return safe;
 105 }
 106
 107 /* Extract an ASN1 object from an ASN1_STRING */
 108
 109 void *ASN1_unpack_string (ASN1_STRING *oct, d2i_of_void *d2i)
 110 {
 111         const unsigned char *p;
 112         char *ret;
 113
 114         p = oct->data;
 115         if(!(ret = d2i(NULL, &p, oct->length)))
 116                 ASN1err(ASN1_F_ASN1_UNPACK_STRING,ASN1_R_DECODE_ERROR);
 117         return ret;
 118 }
 119
 120 /* Pack an ASN1 object into an ASN1_STRING */
 121
 122 ASN1_STRING *ASN1_pack_string(void *obj, int (*i2d)(void *,unsigned char **),
 123                               ASN1_STRING **oct)
 124 {
 125         unsigned char *p;
 126         ASN1_STRING *octmp;
 127
 128         if (!oct || !*oct) {
 129                 if (!(octmp = ASN1_STRING_new ())) {
 130                         ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
 131                         return NULL;
 132                 }
 133                 if (oct) *oct = octmp;
 134         } else octmp = *oct;
 135
 136         if (!(octmp->length = i2d(obj, NULL))) {
 137                 ASN1err(ASN1_F_ASN1_PACK_STRING,ASN1_R_ENCODE_ERROR);
 138                 return NULL;
 139         }
 140         if (!(p = OPENSSL_malloc (octmp->length))) {
 141                 ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
 142                 return NULL;
 143         }
 144         octmp->data = p;
 145         i2d (obj, &p);
 146         return octmp;
 147 }
 148
 149 #endif
 150
 151 /* ASN1_ITEM versions of the above */
 152
 153 ASN1_STRING *ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct)
 154 {
 155         ASN1_STRING *octmp;
 156
 157         if (!oct || !*oct) {
 158                 if (!(octmp = ASN1_STRING_new ())) {
 159                         ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
 160                         return NULL;
 161                 }
 162                 if (oct) *oct = octmp;
 163         } else octmp = *oct;
 164
 165         if(octmp->data) {
 166                 OPENSSL_free(octmp->data);
 167                 octmp->data = NULL;
 168         }
 169
 170         if (!(octmp->length = ASN1_item_i2d(obj, &octmp->data, it))) {
 171                 ASN1err(ASN1_F_ASN1_PACK_STRING,ASN1_R_ENCODE_ERROR);
 172                 return NULL;
 173         }
 174         if (!octmp->data) {
 175                 ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
 176                 return NULL;
 177         }
 178         return octmp;
 179 }
 180
 181 /* Extract an ASN1 object from an ASN1_STRING */
 182
 183 void *ASN1_item_unpack(ASN1_STRING *oct, const ASN1_ITEM *it)
 184 {
 185         const unsigned char *p;
 186         void *ret;
 187
 188         p = oct->data;
 189         if(!(ret = ASN1_item_d2i(NULL, &p, oct->length, it)))
 190                 ASN1err(ASN1_F_ASN1_UNPACK_STRING,ASN1_R_DECODE_ERROR);
 191         return ret;
 192 }