crypto/asn1/asn_pack.c

   1 /*
   2  * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/asn1.h>
  13
  14 /* ASN1 packing and unpacking functions */
  15
  16 ASN1_STRING *ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct)
  17 {
  18     ASN1_STRING *octmp;
  19
  20      if (oct == NULL || *oct == NULL) {
  21         if ((octmp = ASN1_STRING_new()) == NULL) {
  22             ASN1err(ASN1_F_ASN1_ITEM_PACK, ERR_R_MALLOC_FAILURE);
  23             return NULL;
  24         }
  25     } else {
  26         octmp = *oct;
  27     }
  28
  29     OPENSSL_free(octmp->data);
  30     octmp->data = NULL;
  31
  32     if ((octmp->length = ASN1_item_i2d(obj, &octmp->data, it)) == 0) {
  33         ASN1err(ASN1_F_ASN1_ITEM_PACK, ASN1_R_ENCODE_ERROR);
  34         goto err;
  35     }
  36     if (octmp->data == NULL) {
  37         ASN1err(ASN1_F_ASN1_ITEM_PACK, ERR_R_MALLOC_FAILURE);
  38         goto err;
  39     }
  40
  41     if (oct != NULL && *oct == NULL)
  42         *oct = octmp;
  43
  44     return octmp;
  45  err:
  46     if (oct == NULL || *oct == NULL)
  47         ASN1_STRING_free(octmp);
  48     return NULL;
  49 }
  50
  51 /* Extract an ASN1 object from an ASN1_STRING */
  52
  53 void *ASN1_item_unpack(const ASN1_STRING *oct, const ASN1_ITEM *it)
  54 {
  55     const unsigned char *p;
  56     void *ret;
  57
  58     p = oct->data;
  59     if ((ret = ASN1_item_d2i(NULL, &p, oct->length, it)) == NULL)
  60         ASN1err(ASN1_F_ASN1_ITEM_UNPACK, ASN1_R_DECODE_ERROR);
  61     return ret;
  62 }