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tasn_new.c

/* tasn_new.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000-2004 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */


#include <stddef.h>
#include <openssl/asn1.h>
#include <openssl/objects.h>
#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <string.h>

static int asn1_item_ex_combine_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
                                                int combine);
static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);

ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
      {
      ASN1_VALUE *ret = NULL;
      if (ASN1_item_ex_new(&ret, it) > 0)
            return ret;
      return NULL;
      }

/* Allocate an ASN1 structure */

int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      return asn1_item_ex_combine_new(pval, it, 0);
      }

static int asn1_item_ex_combine_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
                                                int combine)
      {
      const ASN1_TEMPLATE *tt = NULL;
      const ASN1_COMPAT_FUNCS *cf;
      const ASN1_EXTERN_FUNCS *ef;
      const ASN1_AUX *aux = it->funcs;
      ASN1_aux_cb *asn1_cb;
      ASN1_VALUE **pseqval;
      int i;
      if (aux && aux->asn1_cb)
            asn1_cb = aux->asn1_cb;
      else
            asn1_cb = 0;

      if (!combine) *pval = NULL;

#ifdef CRYPTO_MDEBUG
      if (it->sname)
            CRYPTO_push_info(it->sname);
#endif

      switch(it->itype)
            {

            case ASN1_ITYPE_EXTERN:
            ef = it->funcs;
            if (ef && ef->asn1_ex_new)
                  {
                  if (!ef->asn1_ex_new(pval, it))
                        goto memerr;
                  }
            break;

            case ASN1_ITYPE_COMPAT:
            cf = it->funcs;
            if (cf && cf->asn1_new) {
                  *pval = cf->asn1_new();
                  if (!*pval)
                        goto memerr;
            }
            break;

            case ASN1_ITYPE_PRIMITIVE:
            if (it->templates)
                  {
                  if (!ASN1_template_new(pval, it->templates))
                        goto memerr;
                  }
            else if (!ASN1_primitive_new(pval, it))
                        goto memerr;
            break;

            case ASN1_ITYPE_MSTRING:
            if (!ASN1_primitive_new(pval, it))
                        goto memerr;
            break;

            case ASN1_ITYPE_CHOICE:
            if (asn1_cb)
                  {
                  i = asn1_cb(ASN1_OP_NEW_PRE, pval, it);
                  if (!i)
                        goto auxerr;
                  if (i==2)
                        {
#ifdef CRYPTO_MDEBUG
                        if (it->sname)
                              CRYPTO_pop_info();
#endif
                        return 1;
                        }
                  }
            if (!combine)
                  {
                  *pval = OPENSSL_malloc(it->size);
                  if (!*pval)
                        goto memerr;
                  memset(*pval, 0, it->size);
                  }
            asn1_set_choice_selector(pval, -1, it);
            if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it))
                        goto auxerr;
            break;

            case ASN1_ITYPE_NDEF_SEQUENCE:
            case ASN1_ITYPE_SEQUENCE:
            if (asn1_cb)
                  {
                  i = asn1_cb(ASN1_OP_NEW_PRE, pval, it);
                  if (!i)
                        goto auxerr;
                  if (i==2)
                        {
#ifdef CRYPTO_MDEBUG
                        if (it->sname)
                              CRYPTO_pop_info();
#endif
                        return 1;
                        }
                  }
            if (!combine)
                  {
                  *pval = OPENSSL_malloc(it->size);
                  if (!*pval)
                        goto memerr;
                  memset(*pval, 0, it->size);
                  asn1_do_lock(pval, 0, it);
                  asn1_enc_init(pval, it);
                  }
            for (i = 0, tt = it->templates; i < it->tcount; tt++, i++)
                  {
                  pseqval = asn1_get_field_ptr(pval, tt);
                  if (!ASN1_template_new(pseqval, tt))
                        goto memerr;
                  }
            if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it))
                        goto auxerr;
            break;
      }
#ifdef CRYPTO_MDEBUG
      if (it->sname) CRYPTO_pop_info();
#endif
      return 1;

      memerr:
      ASN1err(ASN1_F_ASN1_ITEM_EX_COMBINE_NEW, ERR_R_MALLOC_FAILURE);
#ifdef CRYPTO_MDEBUG
      if (it->sname) CRYPTO_pop_info();
#endif
      return 0;

      auxerr:
      ASN1err(ASN1_F_ASN1_ITEM_EX_COMBINE_NEW, ASN1_R_AUX_ERROR);
      ASN1_item_ex_free(pval, it);
#ifdef CRYPTO_MDEBUG
      if (it->sname) CRYPTO_pop_info();
#endif
      return 0;

      }

static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      const ASN1_EXTERN_FUNCS *ef;

      switch(it->itype)
            {

            case ASN1_ITYPE_EXTERN:
            ef = it->funcs;
            if (ef && ef->asn1_ex_clear) 
                  ef->asn1_ex_clear(pval, it);
            else *pval = NULL;
            break;


            case ASN1_ITYPE_PRIMITIVE:
            if (it->templates) 
                  asn1_template_clear(pval, it->templates);
            else
                  asn1_primitive_clear(pval, it);
            break;

            case ASN1_ITYPE_MSTRING:
            asn1_primitive_clear(pval, it);
            break;

            case ASN1_ITYPE_COMPAT:
            case ASN1_ITYPE_CHOICE:
            case ASN1_ITYPE_SEQUENCE:
            case ASN1_ITYPE_NDEF_SEQUENCE:
            *pval = NULL;
            break;
            }
      }


int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
      {
      const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
      int ret;
      if (tt->flags & ASN1_TFLG_OPTIONAL)
            {
            asn1_template_clear(pval, tt);
            return 1;
            }
      /* If ANY DEFINED BY nothing to do */

      if (tt->flags & ASN1_TFLG_ADB_MASK)
            {
            *pval = NULL;
            return 1;
            }
#ifdef CRYPTO_MDEBUG
      if (tt->field_name)
            CRYPTO_push_info(tt->field_name);
#endif
      /* If SET OF or SEQUENCE OF, its a STACK */
      if (tt->flags & ASN1_TFLG_SK_MASK)
            {
            STACK_OF(ASN1_VALUE) *skval;
            skval = sk_ASN1_VALUE_new_null();
            if (!skval)
                  {
                  ASN1err(ASN1_F_ASN1_TEMPLATE_NEW, ERR_R_MALLOC_FAILURE);
                  ret = 0;
                  goto done;
                  }
            *pval = (ASN1_VALUE *)skval;
            ret = 1;
            goto done;
            }
      /* Otherwise pass it back to the item routine */
      ret = asn1_item_ex_combine_new(pval, it, tt->flags & ASN1_TFLG_COMBINE);
      done:
#ifdef CRYPTO_MDEBUG
      if (it->sname)
            CRYPTO_pop_info();
#endif
      return ret;
      }

static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
      {
      /* If ADB or STACK just NULL the field */
      if (tt->flags & (ASN1_TFLG_ADB_MASK|ASN1_TFLG_SK_MASK)) 
            *pval = NULL;
      else
            asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
      }


/* NB: could probably combine most of the real XXX_new() behaviour and junk
 * all the old functions.
 */

int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      ASN1_TYPE *typ;
      int utype;

      if (it && it->funcs)
            {
            const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
            if (pf->prim_new)
                  return pf->prim_new(pval, it);
            }

      if (!it || (it->itype == ASN1_ITYPE_MSTRING))
            utype = -1;
      else
            utype = it->utype;
      switch(utype)
            {
            case V_ASN1_OBJECT:
            *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
            return 1;

            case V_ASN1_BOOLEAN:
            if (it)
                  *(ASN1_BOOLEAN *)pval = it->size;
            else
                  *(ASN1_BOOLEAN *)pval = -1;
            return 1;

            case V_ASN1_NULL:
            *pval = (ASN1_VALUE *)1;
            return 1;

            case V_ASN1_ANY:
            typ = OPENSSL_malloc(sizeof(ASN1_TYPE));
            if (!typ)
                  return 0;
            typ->value.ptr = NULL;
            typ->type = -1;
            *pval = (ASN1_VALUE *)typ;
            break;

            default:
            *pval = (ASN1_VALUE *)ASN1_STRING_type_new(utype);
            break;
            }
      if (*pval)
            return 1;
      return 0;
      }

void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      int utype;
      if (it && it->funcs)
            {
            const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
            if (pf->prim_clear)
                  pf->prim_clear(pval, it);
            else 
                  *pval = NULL;
            return;
            }
      if (!it || (it->itype == ASN1_ITYPE_MSTRING))
            utype = -1;
      else
            utype = it->utype;
      if (utype == V_ASN1_BOOLEAN)
            *(ASN1_BOOLEAN *)pval = it->size;
      else *pval = NULL;
      }

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