lib/libcrypto/asn1/a_dup.c

   1 /* $OpenBSD: a_dup.c,v 1.14 2017/01/29 17:49:22 beck Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60
  61 #include <openssl/asn1.h>
  62 #include <openssl/err.h>
  63
  64 #ifndef NO_OLD_ASN1
  65
  66 void *
  67 ASN1_dup(i2d_of_void *i2d, d2i_of_void *d2i, void *x)
  68 {
  69         unsigned char *b, *p;
  70         const unsigned char *p2;
  71         int i;
  72         char *ret;
  73
  74         if (x == NULL)
  75                 return (NULL);
  76
  77         i = i2d(x, NULL);
  78         b = malloc(i + 10);
  79         if (b == NULL) {
  80                 ASN1error(ERR_R_MALLOC_FAILURE);
  81                 return (NULL);
  82         }
  83         p = b;
  84         i = i2d(x, &p);
  85         p2 = b;
  86         ret = d2i(NULL, &p2, i);
  87         free(b);
  88         return (ret);
  89 }
  90
  91 #endif
  92
  93 /* ASN1_ITEM version of dup: this follows the model above except we don't need
  94  * to allocate the buffer. At some point this could be rewritten to directly dup
  95  * the underlying structure instead of doing and encode and decode.
  96  */
  97
  98 void *
  99 ASN1_item_dup(const ASN1_ITEM *it, void *x)
 100 {
 101         unsigned char *b = NULL;
 102         const unsigned char *p;
 103         long i;
 104         void *ret;
 105
 106         if (x == NULL)
 107                 return (NULL);
 108
 109         i = ASN1_item_i2d(x, &b, it);
 110         if (b == NULL) {
 111                 ASN1error(ERR_R_MALLOC_FAILURE);
 112                 return (NULL);
 113         }
 114         p = b;
 115         ret = ASN1_item_d2i(NULL, &p, i, it);
 116         free(b);
 117         return (ret);
 118 }