/src/libtasn1/lib/decoding.c

Source
/*
 * Copyright (C) 2002-2025 Free Software Foundation, Inc.
 *
 * This file is part of LIBTASN1.
 *
 * The LIBTASN1 library is free software; you can redistribute it
 * and/or modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see
 * <https://www.gnu.org/licenses/>.
 */

#include <config.h>

/*****************************************************/
/* File: decoding.c                                  */
/* Description: Functions to manage DER decoding     */
/*****************************************************/

#include <int.h>
#include <parser_aux.h>
#include <gstr.h>
#include <structure.h>
#include <element.h>
#include <limits.h>
#include <intprops.h>
#include "c-ctype.h"

#ifdef DEBUG
# define warn() fprintf(stderr, "%s: %d\n", __func__, __LINE__)
#else
# define warn()
#endif

#define IS_ERR(len, flags) (len < -1 || ((flags & ASN1_DECODE_FLAG_STRICT_DER) && len < 0))

#define HAVE_TWO(x) (x>=2?1:0)

/* Decoding flags (dflags) used in several decoding functions.
 *  DECODE_FLAG_HAVE_TAG: The provided buffer includes a tag
 *  DECODE_FLAG_CONSTRUCTED: The provided buffer is of indefinite encoding (useful
 *                           when no tags are present).
 *  DECODE_FLAG_LEVEL1: Internal flag to indicate a level of recursion for BER strings.
 *  DECODE_FLAG_LEVEL2: Internal flag to indicate two levels of recursion for BER strings.
 *  DECODE_FLAG_LEVEL3: Internal flag to indicate three levels of recursion for BER strings.
 *                      This is the maximum levels of recursion possible to prevent stack
 *                      exhaustion.
 */

#define DECODE_FLAG_HAVE_TAG 1
#define DECODE_FLAG_CONSTRUCTED (1<<1)
#define DECODE_FLAG_LEVEL1 (1<<2)
#define DECODE_FLAG_LEVEL2 (1<<3)
#define DECODE_FLAG_LEVEL3 (1<<4)

#define DECR_LEN(l, s) do { \
    l -= s; \
    if (l < 0) { \
      warn(); \
      result = ASN1_DER_ERROR; \
      goto cleanup; \
    } \
  } while (0)

static int
_asn1_get_indefinite_length_string (const unsigned char *der, int der_len,
            int *len);

static int
_asn1_decode_simple_ber (unsigned int etype, const unsigned char *der,
       unsigned int _der_len, unsigned char **str,
       unsigned int *str_len, unsigned int *ber_len,
       unsigned dflags);

static int
_asn1_decode_simple_der (unsigned int etype, const unsigned char *der,
       unsigned int _der_len, const unsigned char **str,
       unsigned int *str_len, unsigned dflags);

static void
_asn1_error_description_tag_error (asn1_node node, char *ErrorDescription)
{

  Estrcpy (ErrorDescription, ":: tag error near element '");
  _asn1_hierarchical_name (node, ErrorDescription + strlen (ErrorDescription),
         ASN1_MAX_ERROR_DESCRIPTION_SIZE - 40);
  Estrcat (ErrorDescription, "'");

}

/**
 * asn1_get_length_der:
 * @der: DER data to decode.
 * @der_len: Length of DER data to decode.
 * @len: Output variable containing the length of the DER length field.
 *
 * Extract a length field from DER data.
 *
 * Returns: Return the decoded length value, or -1 on indefinite
 *   length, or -2 when the value was too big to fit in a int, or -4
 *   when the decoded length value plus @len would exceed @der_len.
 **/
long
asn1_get_length_der (const unsigned char *der, int der_len, int *len)
{
  unsigned int ans;
  int k, punt, sum;

  *len = 0;
  if (der_len <= 0)
    return 0;

  if (!(der[0] & 128))
    {
      /* short form */
      *len = 1;
      ans = der[0];
    }
  else
    {
      /* Long form */
      k = der[0] & 0x7F;
      punt = 1;
      if (k)
  {     /* definite length method */
    ans = 0;
    while (punt <= k && punt < der_len)
      {
        if (INT_MULTIPLY_OVERFLOW (ans, 256))
    return -2;
        ans *= 256;

        if (INT_ADD_OVERFLOW (ans, ((unsigned) der[punt])))
    return -2;
        ans += der[punt];
        punt++;
      }
  }
      else
  {     /* indefinite length method */
    *len = punt;
    return -1;
  }

      *len = punt;
    }

  sum = ans;
  if (ans >= INT_MAX || INT_ADD_OVERFLOW (sum, (*len)))
    return -2;
  sum += *len;

  if (sum > der_len)
    return -4;

  return ans;
}

/**
 * asn1_get_tag_der:
 * @der: DER data to decode.
 * @der_len: Length of DER data to decode.
 * @cls: Output variable containing decoded class.
 * @len: Output variable containing the length of the DER TAG data.
 * @tag: Output variable containing the decoded tag (may be %NULL).
 *
 * Decode the class and TAG from DER code.
 *
 * Returns: Returns %ASN1_SUCCESS on success, or an error.
 **/
int
asn1_get_tag_der (const unsigned char *der, int der_len,
      unsigned char *cls, int *len, unsigned long *tag)
{
  unsigned int ris;
  int punt;

  if (der == NULL || der_len < 2 || len == NULL)
    return ASN1_DER_ERROR;

  *cls = der[0] & 0xE0;
  if ((der[0] & 0x1F) != 0x1F)
    {
      /* short form */
      *len = 1;
      ris = der[0] & 0x1F;
    }
  else
    {
      /* Long form */
      punt = 1;
      ris = 0;
      while (punt < der_len && der[punt] & 128)
  {

    if (INT_MULTIPLY_OVERFLOW (ris, 128))
      return ASN1_DER_ERROR;
    ris *= 128;

    if (INT_ADD_OVERFLOW (ris, ((unsigned) (der[punt] & 0x7F))))
      return ASN1_DER_ERROR;
    ris += (der[punt] & 0x7F);
    punt++;
  }

      if (punt >= der_len)
  return ASN1_DER_ERROR;

      if (INT_MULTIPLY_OVERFLOW (ris, 128))
  return ASN1_DER_ERROR;
      ris *= 128;

      if (INT_ADD_OVERFLOW (ris, ((unsigned) (der[punt] & 0x7F))))
  return ASN1_DER_ERROR;
      ris += (der[punt] & 0x7F);
      punt++;

      *len = punt;
    }

  if (tag)
    *tag = ris;
  return ASN1_SUCCESS;
}

/**
 * asn1_get_length_ber:
 * @ber: BER data to decode.
 * @ber_len: Length of BER data to decode.
 * @len: Output variable containing the length of the BER length field.
 *
 * Extract a length field from BER data.  The difference to
 * asn1_get_length_der() is that this function will return a length
 * even if the value has indefinite encoding.
 *
 * Returns: Return the decoded length value, or negative value when
 *   the value was too big.
 *
 * Since: 2.0
 **/
long
asn1_get_length_ber (const unsigned char *ber, int ber_len, int *len)
{
  int ret;
  long err;

  ret = asn1_get_length_der (ber, ber_len, len);

  if (ret == -1 && ber_len > 1)
    {       /* indefinite length method */
      err = _asn1_get_indefinite_length_string (ber + 1, ber_len - 1, &ret);
      if (err != ASN1_SUCCESS)
  return -3;
    }

  return ret;
}

/**
 * asn1_get_octet_der:
 * @der: DER data to decode containing the OCTET SEQUENCE.
 * @der_len: The length of the @der data to decode.
 * @ret_len: Output variable containing the encoded length of the DER data.
 * @str: Pre-allocated output buffer to put decoded OCTET SEQUENCE in.
 * @str_size: Length of pre-allocated output buffer.
 * @str_len: Output variable containing the length of the contents of the OCTET SEQUENCE.
 *
 * Extract an OCTET SEQUENCE from DER data. Note that this function
 * expects the DER data past the tag field, i.e., the length and
 * content octets.
 *
 * Returns: Returns %ASN1_SUCCESS on success, or an error.
 **/
int
asn1_get_octet_der (const unsigned char *der, int der_len,
        int *ret_len, unsigned char *str, int str_size,
        int *str_len)
{
  int len_len = 0;

  if (der_len <= 0)
    return ASN1_GENERIC_ERROR;

  *str_len = asn1_get_length_der (der, der_len, &len_len);

  if (*str_len < 0)
    return ASN1_DER_ERROR;

  *ret_len = *str_len + len_len;
  if (str_size >= *str_len)
    {
      if (*str_len > 0 && str != NULL)
  memcpy (str, der + len_len, *str_len);
    }
  else
    {
      return ASN1_MEM_ERROR;
    }

  return ASN1_SUCCESS;
}


/*-
 * _asn1_get_time_der:
 * @type: %ASN1_ETYPE_GENERALIZED_TIME or %ASN1_ETYPE_UTC_TIME
 * @der: DER data to decode containing the time
 * @der_len: Length of DER data to decode.
 * @ret_len: Output variable containing the length of the DER data.
 * @str: Pre-allocated output buffer to put the textual time in.
 * @str_size: Length of pre-allocated output buffer.
 * @flags: Zero or %ASN1_DECODE_FLAG_STRICT_DER
 *
 * Performs basic checks in the DER encoded time object and returns its textual form.
 * The textual form will be in the YYYYMMDD000000Z format for GeneralizedTime
 * and YYMMDD000000Z for UTCTime.
 *
 * Returns: %ASN1_SUCCESS on success, or an error.
 -*/
static int
_asn1_get_time_der (unsigned type, const unsigned char *der, int der_len,
        int *ret_len, char *str, int str_size, unsigned flags)
{
  int len_len, str_len;
  unsigned i;
  unsigned sign_count = 0;
  unsigned dot_count = 0;
  const unsigned char *p;

  if (der_len <= 0 || str == NULL)
    return ASN1_DER_ERROR;

  str_len = asn1_get_length_der (der, der_len, &len_len);
  if (str_len <= 0 || str_size < str_len)
    return ASN1_DER_ERROR;

  /* perform some sanity checks on the data */
  if (str_len < 8)
    {
      warn ();
      return ASN1_TIME_ENCODING_ERROR;
    }

  if ((flags & ASN1_DECODE_FLAG_STRICT_DER)
      && !(flags & ASN1_DECODE_FLAG_ALLOW_INCORRECT_TIME))
    {
      p = &der[len_len];
      for (i = 0; i < (unsigned) (str_len - 1); i++)
  {
    if (c_isdigit (p[i]) == 0)
      {
        if (type == ASN1_ETYPE_GENERALIZED_TIME)
    {
      /* tolerate lax encodings */
      if (p[i] == '.' && dot_count == 0)
        {
          dot_count++;
          continue;
        }

      /* This is not really valid DER, but there are
       * structures using that */
      if (!(flags & ASN1_DECODE_FLAG_STRICT_DER) &&
          (p[i] == '+' || p[i] == '-') && sign_count == 0)
        {
          sign_count++;
          continue;
        }
    }

        warn ();
        return ASN1_TIME_ENCODING_ERROR;
      }
  }

      if (sign_count == 0 && p[str_len - 1] != 'Z')
  {
    warn ();
    return ASN1_TIME_ENCODING_ERROR;
  }
    }
  memcpy (str, der + len_len, str_len);
  str[str_len] = 0;
  *ret_len = str_len + len_len;

  return ASN1_SUCCESS;
}

/**
 * asn1_get_object_id_der:
 * @der: DER data to decode containing the OBJECT IDENTIFIER
 * @der_len: Length of DER data to decode.
 * @ret_len: Output variable containing the length of the DER data.
 * @str: Pre-allocated output buffer to put the textual object id in.
 * @str_size: Length of pre-allocated output buffer.
 *
 * Converts a DER encoded object identifier to its textual form. This
 * function expects the DER object identifier without the tag.
 *
 * Returns: %ASN1_SUCCESS on success, or an error.
 **/
int
asn1_get_object_id_der (const unsigned char *der, int der_len, int *ret_len,
      char *str, int str_size)
{
  int len_len, len, k;
  int leading, parsed;
  char temp[LTOSTR_MAX_SIZE];
  uint64_t val, val1, val0;

  *ret_len = 0;
  if (str && str_size > 0)
    str[0] = 0;     /* no oid */

  if (str == NULL || der_len <= 0)
    return ASN1_GENERIC_ERROR;

  len = asn1_get_length_der (der, der_len, &len_len);

  if (len <= 0 || len + len_len > der_len)
    return ASN1_DER_ERROR;

  /* leading octet can never be 0x80 */
  if (der[len_len] == 0x80)
    return ASN1_DER_ERROR;

  val0 = 0;

  for (k = 0; k < len; k++)
    {
      if (INT_LEFT_SHIFT_OVERFLOW (val0, 7))
  return ASN1_DER_ERROR;

      val0 <<= 7;
      val0 |= der[len_len + k] & 0x7F;
      if (!(der[len_len + k] & 0x80))
  break;
    }
  parsed = ++k;

  /* val0 = (X*40) + Y, X={0,1,2}, Y<=39 when X={0,1} */
  /* X = val, Y = val1 */

  /* check if X == 0  */
  val = 0;
  val1 = val0;
  if (val1 > 39)
    {
      val = 1;
      val1 = val0 - 40;
      if (val1 > 39)
  {
    val = 2;
    val1 = val0 - 80;
  }
    }

  _asn1_str_cpy (str, str_size, _asn1_ltostr (val, temp));
  _asn1_str_cat (str, str_size, ".");
  _asn1_str_cat (str, str_size, _asn1_ltostr (val1, temp));

  val = 0;
  leading = 1;
  for (k = parsed; k < len; k++)
    {
      /* X.690 mandates that the leading byte must never be 0x80
       */
      if (leading != 0 && der[len_len + k] == 0x80)
  return ASN1_DER_ERROR;
      leading = 0;

      /* check for wrap around */
      if (INT_LEFT_SHIFT_OVERFLOW (val, 7))
  return ASN1_DER_ERROR;

      val = val << 7;
      val |= der[len_len + k] & 0x7F;

      if (!(der[len_len + k] & 0x80))
  {
    _asn1_str_cat (str, str_size, ".");
    _asn1_str_cat (str, str_size, _asn1_ltostr (val, temp));
    val = 0;
    leading = 1;
  }
    }

  if (INT_ADD_OVERFLOW (len, len_len))
    return ASN1_DER_ERROR;

  *ret_len = len + len_len;

  return ASN1_SUCCESS;
}

/**
 * asn1_get_bit_der:
 * @der: DER data to decode containing the BIT SEQUENCE.
 * @der_len: Length of DER data to decode.
 * @ret_len: Output variable containing the length of the DER data.
 * @str: Pre-allocated output buffer to put decoded BIT SEQUENCE in.
 * @str_size: Length of pre-allocated output buffer.
 * @bit_len: Output variable containing the size of the BIT SEQUENCE.
 *
 * Extract a BIT SEQUENCE from DER data.
 *
 * Returns: %ASN1_SUCCESS on success, or an error.
 **/
int
asn1_get_bit_der (const unsigned char *der, int der_len,
      int *ret_len, unsigned char *str, int str_size,
      int *bit_len)
{
  int len_len = 0, len_byte;

  if (der_len <= 0)
    return ASN1_GENERIC_ERROR;

  len_byte = asn1_get_length_der (der, der_len, &len_len) - 1;
  if (len_byte < 0)
    return ASN1_DER_ERROR;

  *ret_len = len_byte + len_len + 1;
  *bit_len = len_byte * 8 - der[len_len];

  if (*bit_len < 0)
    return ASN1_DER_ERROR;

  if (str_size >= len_byte)
    {
      if (len_byte > 0 && str)
  memcpy (str, der + len_len + 1, len_byte);
    }
  else
    {
      return ASN1_MEM_ERROR;
    }

  return ASN1_SUCCESS;
}

/* tag_len: the total tag length (explicit+inner)
 * inner_tag_len: the inner_tag length
 */
static int
_asn1_extract_tag_der (asn1_node node, const unsigned char *der, int der_len,
           int *tag_len, int *inner_tag_len, unsigned flags)
{
  asn1_node p;
  int counter, len2, len3, is_tag_implicit;
  int result;
  unsigned long tag, tag_implicit = 0;
  unsigned char class, class2, class_implicit = 0;

  if (der_len <= 0)
    return ASN1_GENERIC_ERROR;

  counter = is_tag_implicit = 0;

  if (node->type & CONST_TAG)
    {
      p = node->down;
      while (p)
  {
    if (type_field (p->type) == ASN1_ETYPE_TAG)
      {
        if (p->type & CONST_APPLICATION)
    class2 = ASN1_CLASS_APPLICATION;
        else if (p->type & CONST_UNIVERSAL)
    class2 = ASN1_CLASS_UNIVERSAL;
        else if (p->type & CONST_PRIVATE)
    class2 = ASN1_CLASS_PRIVATE;
        else
    class2 = ASN1_CLASS_CONTEXT_SPECIFIC;

        if (p->type & CONST_EXPLICIT)
    {
      if (asn1_get_tag_der
          (der + counter, der_len, &class, &len2,
           &tag) != ASN1_SUCCESS)
        return ASN1_DER_ERROR;

      DECR_LEN (der_len, len2);
      counter += len2;

      if (flags & ASN1_DECODE_FLAG_STRICT_DER)
        len3 =
          asn1_get_length_der (der + counter, der_len, &len2);
      else
        len3 =
          asn1_get_length_ber (der + counter, der_len, &len2);
      if (len3 < 0)
        return ASN1_DER_ERROR;

      DECR_LEN (der_len, len2);
      counter += len2;

      if (!is_tag_implicit)
        {
          if ((class != (class2 | ASN1_CLASS_STRUCTURED)) ||
        (tag != strtoul ((char *) p->value, NULL, 10)))
      return ASN1_TAG_ERROR;
        }
      else
        {   /* ASN1_TAG_IMPLICIT */
          if ((class != class_implicit) || (tag != tag_implicit))
      return ASN1_TAG_ERROR;
        }
      is_tag_implicit = 0;
    }
        else
    {   /* ASN1_TAG_IMPLICIT */
      if (!is_tag_implicit)
        {
          if ((type_field (node->type) == ASN1_ETYPE_SEQUENCE) ||
        (type_field (node->type) == ASN1_ETYPE_SEQUENCE_OF)
        || (type_field (node->type) == ASN1_ETYPE_SET)
        || (type_field (node->type) == ASN1_ETYPE_SET_OF))
      class2 |= ASN1_CLASS_STRUCTURED;
          class_implicit = class2;
          tag_implicit = strtoul ((char *) p->value, NULL, 10);
          is_tag_implicit = 1;
        }
    }
      }
    p = p->right;
  }
    }

  if (is_tag_implicit)
    {
      if (asn1_get_tag_der
    (der + counter, der_len, &class, &len2, &tag) != ASN1_SUCCESS)
  return ASN1_DER_ERROR;

      DECR_LEN (der_len, len2);

      if ((class != class_implicit) || (tag != tag_implicit))
  {
    if (type_field (node->type) == ASN1_ETYPE_OCTET_STRING)
      {
        class_implicit |= ASN1_CLASS_STRUCTURED;
        if ((class != class_implicit) || (tag != tag_implicit))
    return ASN1_TAG_ERROR;
      }
    else
      return ASN1_TAG_ERROR;
  }
    }
  else
    {
      unsigned type = type_field (node->type);
      if (type == ASN1_ETYPE_TAG)
  {
    *tag_len = 0;
    if (inner_tag_len)
      *inner_tag_len = 0;
    return ASN1_SUCCESS;
  }

      if (asn1_get_tag_der
    (der + counter, der_len, &class, &len2, &tag) != ASN1_SUCCESS)
  return ASN1_DER_ERROR;

      DECR_LEN (der_len, len2);

      switch (type)
  {
  case ASN1_ETYPE_NULL:
  case ASN1_ETYPE_BOOLEAN:
  case ASN1_ETYPE_INTEGER:
  case ASN1_ETYPE_ENUMERATED:
  case ASN1_ETYPE_OBJECT_ID:
  case ASN1_ETYPE_GENERALSTRING:
  case ASN1_ETYPE_NUMERIC_STRING:
  case ASN1_ETYPE_IA5_STRING:
  case ASN1_ETYPE_TELETEX_STRING:
  case ASN1_ETYPE_PRINTABLE_STRING:
  case ASN1_ETYPE_UNIVERSAL_STRING:
  case ASN1_ETYPE_BMP_STRING:
  case ASN1_ETYPE_UTF8_STRING:
  case ASN1_ETYPE_VISIBLE_STRING:
  case ASN1_ETYPE_BIT_STRING:
  case ASN1_ETYPE_SEQUENCE:
  case ASN1_ETYPE_SEQUENCE_OF:
  case ASN1_ETYPE_SET:
  case ASN1_ETYPE_SET_OF:
  case ASN1_ETYPE_GENERALIZED_TIME:
  case ASN1_ETYPE_UTC_TIME:
    if ((class != _asn1_tags[type].class)
        || (tag != _asn1_tags[type].tag))
      return ASN1_DER_ERROR;
    break;

  case ASN1_ETYPE_OCTET_STRING:
    /* OCTET STRING is handled differently to allow
     * BER encodings (structured class). */
    if (((class != ASN1_CLASS_UNIVERSAL)
         && (class != (ASN1_CLASS_UNIVERSAL | ASN1_CLASS_STRUCTURED)))
        || (tag != ASN1_TAG_OCTET_STRING))
      return ASN1_DER_ERROR;
    break;
  case ASN1_ETYPE_ANY:
    counter -= len2;
    break;
  case ASN1_ETYPE_CHOICE:
    counter -= len2;
    break;
  default:
    return ASN1_DER_ERROR;
    break;
  }
    }

  counter += len2;
  *tag_len = counter;
  if (inner_tag_len)
    *inner_tag_len = len2;
  return ASN1_SUCCESS;

cleanup:
  return result;
}

static int
extract_tag_der_recursive (asn1_node node, const unsigned char *der,
         int der_len, int *ret_len, int *inner_len,
         unsigned flags)
{
  asn1_node p;
  int ris = ASN1_DER_ERROR;

  if (type_field (node->type) == ASN1_ETYPE_CHOICE)
    {
      p = node->down;
      while (p)
  {
    ris =
      _asn1_extract_tag_der (p, der, der_len, ret_len, inner_len,
           flags);
    if (ris == ASN1_SUCCESS)
      break;
    p = p->right;
  }

      *ret_len = 0;
      return ris;
    }
  else
    return _asn1_extract_tag_der (node, der, der_len, ret_len, inner_len,
          flags);
}

static int
_asn1_delete_not_used (asn1_node node)
{
  asn1_node p, p2;

  if (node == NULL)
    return ASN1_ELEMENT_NOT_FOUND;

  p = node;
  while (p)
    {
      if (p->type & CONST_NOT_USED)
  {
    p2 = NULL;
    if (p != node)
      {
        p2 = _asn1_find_left (p);
        if (!p2)
    p2 = _asn1_find_up (p);
      }
    asn1_delete_structure (&p);
    p = p2;
  }

      if (!p)
  break;     /* reach node */

      if (p->down)
  {
    p = p->down;
  }
      else
  {
    if (p == node)
      p = NULL;
    else if (p->right)
      p = p->right;
    else
      {
        while (1)
    {
      p = _asn1_find_up (p);
      if (p == node)
        {
          p = NULL;
          break;
        }
      if (p->right)
        {
          p = p->right;
          break;
        }
    }
      }
  }
    }
  return ASN1_SUCCESS;
}

static int
_asn1_get_indefinite_length_string (const unsigned char *der,
            int der_len, int *len)
{
  int len2, len3, counter, indefinite;
  int result;
  unsigned long tag;
  unsigned char class;

  counter = indefinite = 0;

  while (1)
    {
      if (HAVE_TWO (der_len) && (der[counter] == 0)
    && (der[counter + 1] == 0))
  {
    counter += 2;
    DECR_LEN (der_len, 2);

    indefinite--;
    if (indefinite <= 0)
      break;
    else
      continue;
  }

      if (asn1_get_tag_der
    (der + counter, der_len, &class, &len2, &tag) != ASN1_SUCCESS)
  return ASN1_DER_ERROR;

      DECR_LEN (der_len, len2);
      counter += len2;

      len2 = asn1_get_length_der (der + counter, der_len, &len3);
      if (len2 < -1)
  return ASN1_DER_ERROR;

      if (len2 == -1)
  {
    indefinite++;
    counter += 1;
    DECR_LEN (der_len, 1);
  }
      else
  {
    counter += len2 + len3;
    DECR_LEN (der_len, len2 + len3);
  }
    }

  *len = counter;
  return ASN1_SUCCESS;

cleanup:
  return result;
}

static void
delete_unneeded_choice_fields (asn1_node p)
{
  asn1_node p2;

  while (p->right)
    {
      p2 = p->right;
      asn1_delete_structure (&p2);
    }
}


/**
 * asn1_der_decoding2
 * @element: pointer to an ASN1 structure.
 * @ider: vector that contains the DER encoding.
 * @max_ider_len: pointer to an integer giving the information about the
 *   maximal number of bytes occupied by *@ider. The real size of the DER
 *   encoding is returned through this pointer.
 * @flags: flags controlling the behaviour of the function.
 * @errorDescription: null-terminated string contains details when an
 *   error occurred.
 *
 * Fill the structure *@element with values of a DER encoding string. The
 * structure must just be created with function asn1_create_element().
 *
 * If %ASN1_DECODE_FLAG_ALLOW_PADDING flag is set then the function will ignore
 * padding after the decoded DER data. Upon a successful return the value of
 * *@max_ider_len will be set to the number of bytes decoded.
 *
 * If %ASN1_DECODE_FLAG_STRICT_DER flag is set then the function will
 * not decode any BER-encoded elements.
 *
 * Returns: %ASN1_SUCCESS if DER encoding OK, %ASN1_ELEMENT_NOT_FOUND
 *   if @ELEMENT is %NULL, and %ASN1_TAG_ERROR or
 *   %ASN1_DER_ERROR if the der encoding doesn't match the structure
 *   name (*@ELEMENT deleted).
 **/
int
asn1_der_decoding2 (asn1_node *element, const void *ider, int *max_ider_len,
        unsigned int flags, char *errorDescription)
{
  asn1_node node, p, p2, p3;
  char temp[128];
  int counter, len2, len3, len4, move, ris, tlen;
  struct node_tail_cache_st tcache = { NULL, NULL };
  unsigned char class;
  unsigned long tag;
  int tag_len;
  int indefinite, result, total_len = *max_ider_len, ider_len = *max_ider_len;
  int inner_tag_len;
  unsigned char *ptmp;
  const unsigned char *ptag;
  const unsigned char *der = ider;

  node = *element;

  if (errorDescription != NULL)
    errorDescription[0] = 0;

  if (node == NULL)
    return ASN1_ELEMENT_NOT_FOUND;

  if (node->type & CONST_OPTION)
    {
      result = ASN1_GENERIC_ERROR;
      warn ();
      goto cleanup;
    }

  counter = 0;
  move = DOWN;
  p = node;
  while (1)
    {
      tag_len = 0;
      inner_tag_len = 0;
      ris = ASN1_SUCCESS;
      if (move != UP)
  {
    if (p->type & CONST_SET)
      {
        p2 = _asn1_find_up (p);
        len2 = p2->tmp_ival;
        if (len2 == -1)
    {
      if (HAVE_TWO (ider_len) && !der[counter]
          && !der[counter + 1])
        {
          p = p2;
          move = UP;
          counter += 2;
          DECR_LEN (ider_len, 2);
          continue;
        }
    }
        else if (counter == len2)
    {
      p = p2;
      move = UP;
      continue;
    }
        else if (counter > len2)
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }
        p2 = p2->down;
        while (p2)
    {
      if ((p2->type & CONST_SET) && (p2->type & CONST_NOT_USED))
        {
          ris =
      extract_tag_der_recursive (p2, der + counter,
               ider_len, &len2, NULL,
               flags);
          if (ris == ASN1_SUCCESS)
      {
        p2->type &= ~CONST_NOT_USED;
        p = p2;
        break;
      }
        }
      p2 = p2->right;
    }
        if (p2 == NULL)
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }
      }

    /* the position in the DER structure this starts */
    p->start = counter;
    p->end = total_len - 1;

    if ((p->type & CONST_OPTION) || (p->type & CONST_DEFAULT))
      {
        p2 = _asn1_find_up (p);
        len2 = p2->tmp_ival;
        if (counter == len2)
    {
      if (p->right)
        {
          p2 = p->right;
          move = RIGHT;
        }
      else
        move = UP;

      if (p->type & CONST_OPTION)
        asn1_delete_structure (&p);

      p = p2;
      continue;
    }
      }

    if (type_field (p->type) == ASN1_ETYPE_CHOICE)
      {
        while (p->down)
    {
      ris =
        extract_tag_der_recursive (p->down, der + counter,
                 ider_len, &len2, NULL, flags);

      if (ris == ASN1_SUCCESS)
        {
          delete_unneeded_choice_fields (p->down);
          break;
        }
      else if (ris == ASN1_ERROR_TYPE_ANY)
        {
          result = ASN1_ERROR_TYPE_ANY;
          warn ();
          goto cleanup;
        }
      else
        {
          p2 = p->down;
          asn1_delete_structure (&p2);
        }
    }

        if (p->down == NULL)
    {
      if (!(p->type & CONST_OPTION))
        {
          result = ASN1_DER_ERROR;
          warn ();
          goto cleanup;
        }
    }
        else if (type_field (p->type) != ASN1_ETYPE_CHOICE)
    p = p->down;

        p->start = counter;
      }

    if ((p->type & CONST_OPTION) || (p->type & CONST_DEFAULT))
      {
        p2 = _asn1_find_up (p);
        len2 = p2->tmp_ival;

        if ((len2 != -1) && (counter > len2))
    ris = ASN1_TAG_ERROR;
      }

    if (ris == ASN1_SUCCESS)
      ris =
        extract_tag_der_recursive (p, der + counter, ider_len,
           &tag_len, &inner_tag_len, flags);

    if (ris != ASN1_SUCCESS)
      {
        if (p->type & CONST_OPTION)
    {
      p->type |= CONST_NOT_USED;
      move = RIGHT;
    }
        else if (p->type & CONST_DEFAULT)
    {
      _asn1_set_value (p, NULL, 0);
      move = RIGHT;
    }
        else
    {
      if (errorDescription != NULL)
        _asn1_error_description_tag_error (p, errorDescription);

      result = ASN1_TAG_ERROR;
      warn ();
      goto cleanup;
    }
      }
    else
      {
        DECR_LEN (ider_len, tag_len);
        counter += tag_len;
      }
  }

      if (ris == ASN1_SUCCESS)
  {
    switch (type_field (p->type))
      {
      case ASN1_ETYPE_NULL:
        DECR_LEN (ider_len, 1);
        if (der[counter])
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }
        counter++;
        move = RIGHT;
        break;
      case ASN1_ETYPE_BOOLEAN:
        DECR_LEN (ider_len, 2);

        if (der[counter++] != 1)
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }
        if (der[counter++] == 0)
    _asn1_set_value (p, "F", 1);
        else
    _asn1_set_value (p, "T", 1);
        move = RIGHT;
        break;
      case ASN1_ETYPE_INTEGER:
      case ASN1_ETYPE_ENUMERATED:
        len2 = asn1_get_length_der (der + counter, ider_len, &len3);
        if (len2 < 0)
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }

        DECR_LEN (ider_len, len3 + len2);

        _asn1_set_value (p, der + counter, len3 + len2);
        counter += len3 + len2;
        move = RIGHT;
        break;
      case ASN1_ETYPE_OBJECT_ID:
        result =
    asn1_get_object_id_der (der + counter, ider_len, &len2,
          temp, sizeof (temp));
        if (result != ASN1_SUCCESS)
    {
      warn ();
      goto cleanup;
    }

        DECR_LEN (ider_len, len2);

        tlen = strlen (temp);
        if (tlen > 0)
    _asn1_set_value (p, temp, tlen + 1);

        counter += len2;
        move = RIGHT;
        break;
      case ASN1_ETYPE_GENERALIZED_TIME:
      case ASN1_ETYPE_UTC_TIME:
        result =
    _asn1_get_time_der (type_field (p->type), der + counter,
            ider_len, &len2, temp, sizeof (temp) - 1,
            flags);
        if (result != ASN1_SUCCESS)
    {
      warn ();
      goto cleanup;
    }

        DECR_LEN (ider_len, len2);

        tlen = strlen (temp);
        if (tlen > 0)
    _asn1_set_value (p, temp, tlen);

        counter += len2;
        move = RIGHT;
        break;
      case ASN1_ETYPE_OCTET_STRING:
        if (counter < inner_tag_len)
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }

        ptag = der + counter - inner_tag_len;
        if ((flags & ASN1_DECODE_FLAG_STRICT_DER)
      || !(ptag[0] & ASN1_CLASS_STRUCTURED))
    {
      if (ptag[0] & ASN1_CLASS_STRUCTURED)
        {
          result = ASN1_DER_ERROR;
          warn ();
          goto cleanup;
        }

      len2 = asn1_get_length_der (der + counter, ider_len, &len3);
      if (len2 < 0)
        {
          result = ASN1_DER_ERROR;
          warn ();
          goto cleanup;
        }

      DECR_LEN (ider_len, len3 + len2);

      _asn1_set_value (p, der + counter, len3 + len2);
      counter += len3 + len2;
    }
        else
    {
      unsigned dflags = 0, vlen, ber_len;

      if (ptag[0] & ASN1_CLASS_STRUCTURED)
        dflags |= DECODE_FLAG_CONSTRUCTED;

      result =
        _asn1_decode_simple_ber (type_field (p->type),
               der + counter, ider_len, &ptmp,
               &vlen, &ber_len, dflags);
      if (result != ASN1_SUCCESS)
        {
          warn ();
          goto cleanup;
        }

      DECR_LEN (ider_len, ber_len);

      _asn1_set_value_lv (p, ptmp, vlen);

      counter += ber_len;
      free (ptmp);
    }
        move = RIGHT;
        break;
      case ASN1_ETYPE_GENERALSTRING:
      case ASN1_ETYPE_NUMERIC_STRING:
      case ASN1_ETYPE_IA5_STRING:
      case ASN1_ETYPE_TELETEX_STRING:
      case ASN1_ETYPE_PRINTABLE_STRING:
      case ASN1_ETYPE_UNIVERSAL_STRING:
      case ASN1_ETYPE_BMP_STRING:
      case ASN1_ETYPE_UTF8_STRING:
      case ASN1_ETYPE_VISIBLE_STRING:
      case ASN1_ETYPE_BIT_STRING:
        len2 = asn1_get_length_der (der + counter, ider_len, &len3);
        if (len2 < 0)
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }

        DECR_LEN (ider_len, len3 + len2);

        _asn1_set_value (p, der + counter, len3 + len2);
        counter += len3 + len2;
        move = RIGHT;
        break;
      case ASN1_ETYPE_SEQUENCE:
      case ASN1_ETYPE_SET:
        if (move == UP)
    {
      len2 = p->tmp_ival;
      p->tmp_ival = 0;
      if (len2 == -1)
        {   /* indefinite length method */
          DECR_LEN (ider_len, 2);
          if ((der[counter]) || der[counter + 1])
      {
        result = ASN1_DER_ERROR;
        warn ();
        goto cleanup;
      }
          counter += 2;
        }
      else
        {   /* definite length method */
          if (len2 != counter)
      {
        result = ASN1_DER_ERROR;
        warn ();
        goto cleanup;
      }
        }
      move = RIGHT;
    }
        else
    {   /* move==DOWN || move==RIGHT */
      len3 = asn1_get_length_der (der + counter, ider_len, &len2);
      if (IS_ERR (len3, flags))
        {
          result = ASN1_DER_ERROR;
          warn ();
          goto cleanup;
        }

      DECR_LEN (ider_len, len2);
      counter += len2;

      if (len3 > 0)
        {
          p->tmp_ival = counter + len3;
          move = DOWN;
        }
      else if (len3 == 0)
        {
          p2 = p->down;
          while (p2)
      {
        if (type_field (p2->type) != ASN1_ETYPE_TAG)
          {
            p3 = p2->right;
            asn1_delete_structure (&p2);
            p2 = p3;
          }
        else
          p2 = p2->right;
      }
          move = RIGHT;
        }
      else
        {   /* indefinite length method */
          p->tmp_ival = -1;
          move = DOWN;
        }
    }
        break;
      case ASN1_ETYPE_SEQUENCE_OF:
      case ASN1_ETYPE_SET_OF:
        if (move == UP)
    {
      len2 = p->tmp_ival;
      if (len2 == -1)
        {   /* indefinite length method */
          if (!HAVE_TWO (ider_len)
        || ((der[counter]) || der[counter + 1]))
      {
        result = _asn1_append_sequence_set (p, &tcache);
        if (result != 0)
          {
            warn ();
            goto cleanup;
          }
        p = tcache.tail;
        move = RIGHT;
        continue;
      }

          p->tmp_ival = 0;
          tcache.tail = NULL; /* finished decoding this structure */
          tcache.head = NULL;
          DECR_LEN (ider_len, 2);
          counter += 2;
        }
      else
        {   /* definite length method */
          if (len2 > counter)
      {
        result = _asn1_append_sequence_set (p, &tcache);
        if (result != 0)
          {
            warn ();
            goto cleanup;
          }
        p = tcache.tail;
        move = RIGHT;
        continue;
      }

          p->tmp_ival = 0;
          tcache.tail = NULL; /* finished decoding this structure */
          tcache.head = NULL;

          if (len2 != counter)
      {
        result = ASN1_DER_ERROR;
        warn ();
        goto cleanup;
      }
        }
    }
        else
    {   /* move==DOWN || move==RIGHT */
      len3 = asn1_get_length_der (der + counter, ider_len, &len2);
      if (IS_ERR (len3, flags))
        {
          result = ASN1_DER_ERROR;
          warn ();
          goto cleanup;
        }

      DECR_LEN (ider_len, len2);
      counter += len2;
      if (len3)
        {
          if (len3 > 0)
      { /* definite length method */
        p->tmp_ival = counter + len3;
      }
          else
      { /* indefinite length method */
        p->tmp_ival = -1;
      }

          p2 = p->down;
          if (p2 == NULL)
      {
        result = ASN1_DER_ERROR;
        warn ();
        goto cleanup;
      }

          while ((type_field (p2->type) == ASN1_ETYPE_TAG)
           || (type_field (p2->type) == ASN1_ETYPE_SIZE))
      p2 = p2->right;
          if (p2->right == NULL)
      {
        result = _asn1_append_sequence_set (p, &tcache);
        if (result != 0)
          {
            warn ();
            goto cleanup;
          }
      }
          p = p2;
        }
    }
        move = RIGHT;
        break;
      case ASN1_ETYPE_ANY:
        /* Check indefinite length method in an EXPLICIT TAG */

        if (!(flags & ASN1_DECODE_FLAG_STRICT_DER)
      && (p->type & CONST_TAG) && tag_len == 2
      && (der[counter - 1] == 0x80))
    indefinite = 1;
        else
    indefinite = 0;

        if (asn1_get_tag_der
      (der + counter, ider_len, &class, &len2,
       &tag) != ASN1_SUCCESS)
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }

        DECR_LEN (ider_len, len2);

        len4 =
    asn1_get_length_der (der + counter + len2, ider_len, &len3);
        if (IS_ERR (len4, flags))
    {
      result = ASN1_DER_ERROR;
      warn ();
      goto cleanup;
    }
        if (len4 != -1)  /* definite */
    {
      len2 += len4;

      DECR_LEN (ider_len, len4 + len3);
      _asn1_set_value_lv (p, der + counter, len2 + len3);
      counter += len2 + len3;
    }
        else    /* == -1 */
    {   /* indefinite length */
      ider_len += len2; /* undo DECR_LEN */

      if (counter == 0)
        {
          result = ASN1_DER_ERROR;
          warn ();
          goto cleanup;
        }

      result =
        _asn1_get_indefinite_length_string (der + counter,
              ider_len, &len2);
      if (result != ASN1_SUCCESS)
        {
          warn ();
          goto cleanup;
        }

      DECR_LEN (ider_len, len2);
      _asn1_set_value_lv (p, der + counter, len2);
      counter += len2;

    }

        /* Check if a couple of 0x00 are present due to an EXPLICIT TAG with
           an indefinite length method. */
        if (indefinite)
    {
      DECR_LEN (ider_len, 2);
      if (!der[counter] && !der[counter + 1])
        {
          counter += 2;
        }
      else
        {
          result = ASN1_DER_ERROR;
          warn ();
          goto cleanup;
        }
    }

        move = RIGHT;
        break;
      default:
        move = (move == UP) ? RIGHT : DOWN;
        break;
      }
  }

      if (p)
  {
    p->end = counter - 1;
  }

      if (p == node && move != DOWN)
  break;

      if (move == DOWN)
  {
    if (p->down)
      p = p->down;
    else
      move = RIGHT;
  }
      if ((move == RIGHT) && !(p->type & CONST_SET))
  {
    if (p->right)
      p = p->right;
    else
      move = UP;
  }
      if (move == UP)
  {
    /* If we are parsing a sequence or set and p is a direct
       child of it, no need to traverse the list back to the leftmost node. */
    if (tcache.tail == p)
      p = tcache.head;
    else
      p = _asn1_find_up (p);
  }
    }

  _asn1_delete_not_used (*element);

  if ((ider_len < 0) ||
      (!(flags & ASN1_DECODE_FLAG_ALLOW_PADDING) && (ider_len != 0)))
    {
      warn ();
      result = ASN1_DER_ERROR;
      goto cleanup;
    }

  *max_ider_len = total_len - ider_len;

  return ASN1_SUCCESS;

cleanup:
  asn1_delete_structure (element);
  return result;
}


/**
 * asn1_der_decoding:
 * @element: pointer to an ASN1 structure.
 * @ider: vector that contains the DER encoding.
 * @ider_len: number of bytes of *@ider: @ider[0]..@ider[len-1].
 * @errorDescription: null-terminated string contains details when an
 *   error occurred.
 *
 * Fill the structure *@element with values of a DER encoding
 * string. The structure must just be created with function
 * asn1_create_element().
 *
 * Note that the *@element variable is provided as a pointer for
 * historical reasons.
 *
 * Returns: %ASN1_SUCCESS if DER encoding OK, %ASN1_ELEMENT_NOT_FOUND
 *   if @ELEMENT is %NULL, and %ASN1_TAG_ERROR or
 *   %ASN1_DER_ERROR if the der encoding doesn't match the structure
 *   name (*@ELEMENT deleted).
 **/
int
asn1_der_decoding (asn1_node *element, const void *ider, int ider_len,
       char *errorDescription)
{
  return asn1_der_decoding2 (element, ider, &ider_len, 0, errorDescription);
}

/**
 * asn1_der_decoding_element:
 * @structure: pointer to an ASN1 structure
 * @elementName: name of the element to fill
 * @ider: vector that contains the DER encoding of the whole structure.
 * @len: number of bytes of *der: der[0]..der[len-1]
 * @errorDescription: null-terminated string contains details when an
 *   error occurred.
 *
 * Fill the element named @ELEMENTNAME with values of a DER encoding
 * string.  The structure must just be created with function
 * asn1_create_element().  The DER vector must contain the encoding
 * string of the whole @STRUCTURE.  If an error occurs during the
 * decoding procedure, the *@STRUCTURE is deleted and set equal to
 * %NULL.
 *
 * This function is deprecated and may just be an alias to asn1_der_decoding
 * in future versions. Use asn1_der_decoding() instead.
 *
 * Returns: %ASN1_SUCCESS if DER encoding OK, %ASN1_ELEMENT_NOT_FOUND
 *   if ELEMENT is %NULL or @elementName == NULL, and
 *   %ASN1_TAG_ERROR or %ASN1_DER_ERROR if the der encoding doesn't
 *   match the structure @structure (*ELEMENT deleted).
 **/
int
asn1_der_decoding_element (asn1_node *structure, const char *elementName,
         const void *ider, int len, char *errorDescription)
{
  return asn1_der_decoding (structure, ider, len, errorDescription);
}

/**
 * asn1_der_decoding_startEnd:
 * @element: pointer to an ASN1 element
 * @ider: vector that contains the DER encoding.
 * @ider_len: number of bytes of *@ider: @ider[0]..@ider[len-1]
 * @name_element: an element of NAME structure.
 * @start: the position of the first byte of NAME_ELEMENT decoding
 *   (@ider[*start])
 * @end: the position of the last byte of NAME_ELEMENT decoding
 *  (@ider[*end])
 *
 * Find the start and end point of an element in a DER encoding
 * string. I mean that if you have a der encoding and you have already
 * used the function asn1_der_decoding() to fill a structure, it may
 * happen that you want to find the piece of string concerning an
 * element of the structure.
 *
 * One example is the sequence "tbsCertificate" inside an X509
 * certificate.
 *
 * Note that since libtasn1 3.7 the @ider and @ider_len parameters
 * can be omitted, if the element is already decoded using asn1_der_decoding().
 *
 * Returns: %ASN1_SUCCESS if DER encoding OK, %ASN1_ELEMENT_NOT_FOUND
 *   if ELEMENT is %asn1_node EMPTY or @name_element is not a valid
 *   element, %ASN1_TAG_ERROR or %ASN1_DER_ERROR if the der encoding
 *   doesn't match the structure ELEMENT.
 **/
int
asn1_der_decoding_startEnd (asn1_node element, const void *ider, int ider_len,
          const char *name_element, int *start, int *end)
{
  asn1_node node, node_to_find;
  int result = ASN1_DER_ERROR;

  node = element;

  if (node == NULL)
    return ASN1_ELEMENT_NOT_FOUND;

  node_to_find = asn1_find_node (node, name_element);

  if (node_to_find == NULL)
    return ASN1_ELEMENT_NOT_FOUND;

  *start = node_to_find->start;
  *end = node_to_find->end;

  if (*start == 0 && *end == 0)
    {
      if (ider == NULL || ider_len == 0)
  return ASN1_GENERIC_ERROR;

      /* it seems asn1_der_decoding() wasn't called before. Do it now */
      result = asn1_der_decoding (&node, ider, ider_len, NULL);
      if (result != ASN1_SUCCESS)
  {
    warn ();
    return result;
  }

      node_to_find = asn1_find_node (node, name_element);
      if (node_to_find == NULL)
  return ASN1_ELEMENT_NOT_FOUND;

      *start = node_to_find->start;
      *end = node_to_find->end;
    }

  if (*end < *start)
    return ASN1_GENERIC_ERROR;

  return ASN1_SUCCESS;
}

/**
 * asn1_expand_any_defined_by:
 * @definitions: ASN1 definitions
 * @element: pointer to an ASN1 structure
 *
 * Expands every "ANY DEFINED BY" element of a structure created from
 * a DER decoding process (asn1_der_decoding function). The element
 * ANY must be defined by an OBJECT IDENTIFIER. The type used to
 * expand the element ANY is the first one following the definition of
 * the actual value of the OBJECT IDENTIFIER.
 *
 * Returns: %ASN1_SUCCESS if Substitution OK, %ASN1_ERROR_TYPE_ANY if
 *   some "ANY DEFINED BY" element couldn't be expanded due to a
 *   problem in OBJECT_ID -> TYPE association, or other error codes
 *   depending on DER decoding.
 **/
int
asn1_expand_any_defined_by (asn1_node_const definitions, asn1_node *element)
{
  char name[2 * ASN1_MAX_NAME_SIZE + 2], value[ASN1_MAX_NAME_SIZE];
  int retCode = ASN1_SUCCESS, result;
  int len, len2, len3;
  asn1_node_const p2;
  asn1_node p, p3, aux = NULL;
  char errorDescription[ASN1_MAX_ERROR_DESCRIPTION_SIZE];
  const char *definitionsName;

  if ((definitions == NULL) || (*element == NULL))
    return ASN1_ELEMENT_NOT_FOUND;

  definitionsName = definitions->name;

  p = *element;
  while (p)
    {

      switch (type_field (p->type))
  {
  case ASN1_ETYPE_ANY:
    if ((p->type & CONST_DEFINED_BY) && (p->value))
      {
        /* search the "DEF_BY" element */
        p2 = p->down;
        while ((p2) && (type_field (p2->type) != ASN1_ETYPE_CONSTANT))
    p2 = p2->right;

        if (!p2)
    {
      retCode = ASN1_ERROR_TYPE_ANY;
      break;
    }

        p3 = _asn1_find_up (p);

        if (!p3)
    {
      retCode = ASN1_ERROR_TYPE_ANY;
      break;
    }

        p3 = p3->down;
        while (p3)
    {
      if (!(strcmp (p3->name, p2->name)))
        break;
      p3 = p3->right;
    }

        if ((!p3) || (type_field (p3->type) != ASN1_ETYPE_OBJECT_ID) ||
      (p3->value == NULL))
    {

      p3 = _asn1_find_up (p);
      p3 = _asn1_find_up (p3);

      if (!p3)
        {
          retCode = ASN1_ERROR_TYPE_ANY;
          break;
        }

      p3 = p3->down;

      while (p3)
        {
          if (!(strcmp (p3->name, p2->name)))
      break;
          p3 = p3->right;
        }

      if ((!p3) || (type_field (p3->type) != ASN1_ETYPE_OBJECT_ID)
          || (p3->value == NULL))
        {
          retCode = ASN1_ERROR_TYPE_ANY;
          break;
        }
    }

        /* search the OBJECT_ID into definitions */
        p2 = definitions->down;
        while (p2)
    {
      if ((type_field (p2->type) == ASN1_ETYPE_OBJECT_ID) &&
          (p2->type & CONST_ASSIGN))
        {
          snprintf (name, sizeof (name), "%s.%s", definitionsName,
        p2->name);

          len = ASN1_MAX_NAME_SIZE;
          result =
      asn1_read_value (definitions, name, value, &len);

          if ((result == ASN1_SUCCESS)
        && (!_asn1_strcmp (p3->value, value)))
      {
        p2 = p2->right; /* pointer to the structure to
               use for expansion */
        while ((p2) && (p2->type & CONST_ASSIGN))
          p2 = p2->right;

        if (p2)
          {
            snprintf (name, sizeof (name), "%s.%s",
          definitionsName, p2->name);

            result =
        asn1_create_element (definitions, name, &aux);
            if (result == ASN1_SUCCESS)
        {
          _asn1_cpy_name (aux, p);
          len2 =
            asn1_get_length_der (p->value,
               p->value_len, &len3);
          if (len2 < 0)
            return ASN1_DER_ERROR;

          result =
            asn1_der_decoding (&aux, p->value + len3,
                   len2,
                   errorDescription);
          if (result == ASN1_SUCCESS)
            {

              _asn1_set_right (aux, p->right);
              _asn1_set_right (p, aux);

              result = asn1_delete_structure (&p);
              if (result == ASN1_SUCCESS)
          {
            p = aux;
            aux = NULL;
            break;
          }
              else
          { /* error with asn1_delete_structure */
            asn1_delete_structure (&aux);
            retCode = result;
            break;
          }
            }
          else
            { /* error with asn1_der_decoding */
              retCode = result;
              break;
            }
        }
            else
        { /* error with asn1_create_element */
          retCode = result;
          break;
        }
          }
        else
          { /* error with the pointer to the structure to expand */
            retCode = ASN1_ERROR_TYPE_ANY;
            break;
          }
      }
        }
      p2 = p2->right;
    }    /* end while */

        if (!p2)
    {
      retCode = ASN1_ERROR_TYPE_ANY;
      break;
    }

      }
    break;
  default:
    break;
  }


      if (p->down)
  {
    p = p->down;
  }
      else if (p == *element)
  {
    p = NULL;
    break;
  }
      else if (p->right)
  p = p->right;
      else
  {
    while (1)
      {
        p = _asn1_find_up (p);
        if (p == *element)
    {
      p = NULL;
      break;
    }
        if (p->right)
    {
      p = p->right;
      break;
    }
      }
  }
    }

  return retCode;
}

/**
 * asn1_expand_octet_string:
 * @definitions: ASN1 definitions
 * @element: pointer to an ASN1 structure
 * @octetName: name of the OCTET STRING field to expand.
 * @objectName: name of the OBJECT IDENTIFIER field to use to define
 *    the type for expansion.
 *
 * Expands an "OCTET STRING" element of a structure created from a DER
 * decoding process (the asn1_der_decoding() function).  The type used
 * for expansion is the first one following the definition of the
 * actual value of the OBJECT IDENTIFIER indicated by OBJECTNAME.
 *
 * Returns: %ASN1_SUCCESS if substitution OK, %ASN1_ELEMENT_NOT_FOUND
 *   if @objectName or @octetName are not correct,
 *   %ASN1_VALUE_NOT_VALID if it wasn't possible to find the type to
 *   use for expansion, or other errors depending on DER decoding.
 **/
int
asn1_expand_octet_string (asn1_node_const definitions, asn1_node *element,
        const char *octetName, const char *objectName)
{
  char name[2 * ASN1_MAX_NAME_SIZE + 1], value[ASN1_MAX_NAME_SIZE];
  int retCode = ASN1_SUCCESS, result;
  int len, len2, len3;
  asn1_node_const p2;
  asn1_node aux = NULL;
  asn1_node octetNode = NULL, objectNode = NULL;
  char errorDescription[ASN1_MAX_ERROR_DESCRIPTION_SIZE];

  if ((definitions == NULL) || (*element == NULL))
    return ASN1_ELEMENT_NOT_FOUND;

  octetNode = asn1_find_node (*element, octetName);
  if (octetNode == NULL)
    return ASN1_ELEMENT_NOT_FOUND;
  if (type_field (octetNode->type) != ASN1_ETYPE_OCTET_STRING)
    return ASN1_ELEMENT_NOT_FOUND;
  if (octetNode->value == NULL)
    return ASN1_VALUE_NOT_FOUND;

  objectNode = asn1_find_node (*element, objectName);
  if (objectNode == NULL)
    return ASN1_ELEMENT_NOT_FOUND;

  if (type_field (objectNode->type) != ASN1_ETYPE_OBJECT_ID)
    return ASN1_ELEMENT_NOT_FOUND;

  if (objectNode->value == NULL)
    return ASN1_VALUE_NOT_FOUND;


  /* search the OBJECT_ID into definitions */
  p2 = definitions->down;
  while (p2)
    {
      if ((type_field (p2->type) == ASN1_ETYPE_OBJECT_ID) &&
    (p2->type & CONST_ASSIGN))
  {
    strcpy (name, definitions->name);
    strcat (name, ".");
    strcat (name, p2->name);

    len = sizeof (value);
    result = asn1_read_value (definitions, name, value, &len);

    if ((result == ASN1_SUCCESS)
        && (!_asn1_strcmp (objectNode->value, value)))
      {

        p2 = p2->right; /* pointer to the structure to
           use for expansion */
        while ((p2) && (p2->type & CONST_ASSIGN))
    p2 = p2->right;

        if (p2)
    {
      strcpy (name, definitions->name);
      strcat (name, ".");
      strcat (name, p2->name);

      result = asn1_create_element (definitions, name, &aux);
      if (result == ASN1_SUCCESS)
        {
          _asn1_cpy_name (aux, octetNode);
          len2 =
      asn1_get_length_der (octetNode->value,
               octetNode->value_len, &len3);
          if (len2 < 0)
      return ASN1_DER_ERROR;

          result =
      asn1_der_decoding (&aux, octetNode->value + len3,
             len2, errorDescription);
          if (result == ASN1_SUCCESS)
      {

        _asn1_set_right (aux, octetNode->right);
        _asn1_set_right (octetNode, aux);

        result = asn1_delete_structure (&octetNode);
        if (result == ASN1_SUCCESS)
          {
            aux = NULL;
            break;
          }
        else
          { /* error with asn1_delete_structure */
            asn1_delete_structure (&aux);
            retCode = result;
            break;
          }
      }
          else
      { /* error with asn1_der_decoding */
        retCode = result;
        break;
      }
        }
      else
        {   /* error with asn1_create_element */
          retCode = result;
          break;
        }
    }
        else
    {   /* error with the pointer to the structure to expand */
      retCode = ASN1_VALUE_NOT_VALID;
      break;
    }
      }
  }

      p2 = p2->right;

    }

  if (!p2)
    retCode = ASN1_VALUE_NOT_VALID;

  return retCode;
}

/*-
 * _asn1_decode_simple_der:
 * @etype: The type of the string to be encoded (ASN1_ETYPE_)
 * @der: the encoded string
 * @_der_len: the bytes of the encoded string
 * @str: a pointer to the data
 * @str_len: the length of the data
 * @dflags: DECODE_FLAG_*
 *
 * Decodes a simple DER encoded type (e.g. a string, which is not constructed).
 * The output is a pointer inside the @der.
 *
 * Returns: %ASN1_SUCCESS if successful or an error value.
 -*/
static int
_asn1_decode_simple_der (unsigned int etype, const unsigned char *der,
       unsigned int _der_len, const unsigned char **str,
       unsigned int *str_len, unsigned dflags)
{
  int tag_len, len_len;
  const unsigned char *p;
  int der_len = _der_len;
  unsigned char class;
  unsigned long tag;
  long ret;

  if (der == NULL || der_len == 0)
    return ASN1_VALUE_NOT_VALID;

  if (ETYPE_OK (etype) == 0 || ETYPE_IS_STRING (etype) == 0)
    return ASN1_VALUE_NOT_VALID;

  /* doesn't handle constructed classes */
  class = ETYPE_CLASS (etype);
  if (class != ASN1_CLASS_UNIVERSAL)
    return ASN1_VALUE_NOT_VALID;

  p = der;

  if (dflags & DECODE_FLAG_HAVE_TAG)
    {
      ret = asn1_get_tag_der (p, der_len, &class, &tag_len, &tag);
      if (ret != ASN1_SUCCESS)
  return ret;

      if (class != ETYPE_CLASS (etype) || tag != ETYPE_TAG (etype))
  {
    warn ();
    return ASN1_DER_ERROR;
  }

      p += tag_len;
      der_len -= tag_len;
      if (der_len <= 0)
  return ASN1_DER_ERROR;
    }

  ret = asn1_get_length_der (p, der_len, &len_len);
  if (ret < 0)
    return ASN1_DER_ERROR;

  p += len_len;
  der_len -= len_len;
  if (der_len <= 0)
    return ASN1_DER_ERROR;

  *str_len = ret;
  *str = p;

  return ASN1_SUCCESS;
}

/**
 * asn1_decode_simple_der:
 * @etype: The type of the string to be encoded (ASN1_ETYPE_)
 * @der: the encoded string
 * @_der_len: the bytes of the encoded string
 * @str: a pointer to the data
 * @str_len: the length of the data
 *
 * Decodes a simple DER encoded type (e.g. a string, which is not constructed).
 * The output is a pointer inside the @der.
 *
 * Returns: %ASN1_SUCCESS if successful or an error value.
 **/
int
asn1_decode_simple_der (unsigned int etype, const unsigned char *der,
      unsigned int _der_len, const unsigned char **str,
      unsigned int *str_len)
{
  return _asn1_decode_simple_der (etype, der, _der_len, str, str_len,
          DECODE_FLAG_HAVE_TAG);
}

static int
append (uint8_t **dst, unsigned *dst_size, const unsigned char *src,
  unsigned src_size)
{
  if (src_size == 0)
    return ASN1_SUCCESS;

  *dst = _asn1_realloc (*dst, *dst_size + src_size);
  if (*dst == NULL)
    return ASN1_MEM_ALLOC_ERROR;
  memcpy (*dst + *dst_size, src, src_size);
  *dst_size += src_size;
  return ASN1_SUCCESS;
}

/*-
 * _asn1_decode_simple_ber:
 * @etype: The type of the string to be encoded (ASN1_ETYPE_)
 * @der: the encoded string
 * @_der_len: the bytes of the encoded string
 * @str: a pointer to the data
 * @str_len: the length of the data
 * @ber_len: the total length occupied by BER (may be %NULL)
 * @have_tag: whether a DER tag is included
 *
 * Decodes a BER encoded type. The output is an allocated value
 * of the data. This decodes BER STRINGS only. Other types are
 * decoded as DER.
 *
 * Returns: %ASN1_SUCCESS if successful or an error value.
 -*/
static int
_asn1_decode_simple_ber (unsigned int etype, const unsigned char *der,
       unsigned int _der_len, unsigned char **str,
       unsigned int *str_len, unsigned int *ber_len,
       unsigned dflags)
{
  int tag_len, len_len;
  const unsigned char *p;
  int der_len = _der_len;
  uint8_t *total = NULL;
  unsigned total_size = 0;
  unsigned char class;
  unsigned long tag;
  unsigned char *out = NULL;
  const unsigned char *cout = NULL;
  unsigned out_len;
  long result;

  if (ber_len)
    *ber_len = 0;

  if (der == NULL || der_len == 0)
    {
      warn ();
      return ASN1_VALUE_NOT_VALID;
    }

  if (ETYPE_OK (etype) == 0)
    {
      warn ();
      return ASN1_VALUE_NOT_VALID;
    }

  /* doesn't handle constructed + definite classes */
  class = ETYPE_CLASS (etype);
  if (class != ASN1_CLASS_UNIVERSAL)
    {
      warn ();
      return ASN1_VALUE_NOT_VALID;
    }

  p = der;

  if (dflags & DECODE_FLAG_HAVE_TAG)
    {
      result = asn1_get_tag_der (p, der_len, &class, &tag_len, &tag);
      if (result != ASN1_SUCCESS)
  {
    warn ();
    return result;
  }

      if (tag != ETYPE_TAG (etype))
  {
    warn ();
    return ASN1_DER_ERROR;
  }

      p += tag_len;

      DECR_LEN (der_len, tag_len);

      if (ber_len)
  *ber_len += tag_len;
    }

  /* indefinite constructed */
  if ((((dflags & DECODE_FLAG_CONSTRUCTED) || class == ASN1_CLASS_STRUCTURED)
       && ETYPE_IS_STRING (etype)) && !(dflags & DECODE_FLAG_LEVEL3))
    {
      if (der_len == 0)
  {
    warn ();
    result = ASN1_DER_ERROR;
    goto cleanup;
  }

      if (der_len > 0 && p[0] == 0x80)  /* indefinite */
  {
    len_len = 1;
    DECR_LEN (der_len, len_len);
    p += len_len;

    if (ber_len)
      *ber_len += len_len;

    /* decode the available octet strings */
    do
      {
        unsigned tmp_len;
        unsigned flags = DECODE_FLAG_HAVE_TAG;

        if (dflags & DECODE_FLAG_LEVEL1)
    flags |= DECODE_FLAG_LEVEL2;
        else if (dflags & DECODE_FLAG_LEVEL2)
    flags |= DECODE_FLAG_LEVEL3;
        else
    flags |= DECODE_FLAG_LEVEL1;

        result =
    _asn1_decode_simple_ber (etype, p, der_len, &out, &out_len,
           &tmp_len, flags);
        if (result != ASN1_SUCCESS)
    {
      warn ();
      goto cleanup;
    }

        p += tmp_len;
        DECR_LEN (der_len, tmp_len);

        if (ber_len)
    *ber_len += tmp_len;

        DECR_LEN (der_len, 2); /* we need the EOC */

        result = append (&total, &total_size, out, out_len);
        if (result != ASN1_SUCCESS)
    {
      warn ();
      goto cleanup;
    }

        free (out);
        out = NULL;

        if (p[0] == 0 && p[1] == 0)  /* EOC */
    {
      if (ber_len)
        *ber_len += 2;
      break;
    }

        /* no EOC */
        der_len += 2;

        if (der_len == 2)
    {
      warn ();
      result = ASN1_DER_ERROR;
      goto cleanup;
    }
      }
    while (1);
  }
      else      /* constructed */
  {
    long const_len;

    result = asn1_get_length_ber (p, der_len, &len_len);
    if (result < 0)
      {
        warn ();
        result = ASN1_DER_ERROR;
        goto cleanup;
      }

    DECR_LEN (der_len, len_len);
    p += len_len;

    const_len = result;

    if (ber_len)
      *ber_len += len_len;

    /* decode the available octet strings */
    while (const_len > 0)
      {
        unsigned tmp_len;
        unsigned flags = DECODE_FLAG_HAVE_TAG;

        if (dflags & DECODE_FLAG_LEVEL1)
    flags |= DECODE_FLAG_LEVEL2;
        else if (dflags & DECODE_FLAG_LEVEL2)
    flags |= DECODE_FLAG_LEVEL3;
        else
    flags |= DECODE_FLAG_LEVEL1;

        result =
    _asn1_decode_simple_ber (etype, p, der_len, &out, &out_len,
           &tmp_len, flags);
        if (result != ASN1_SUCCESS)
    {
      warn ();
      goto cleanup;
    }

        p += tmp_len;
        DECR_LEN (der_len, tmp_len);
        DECR_LEN (const_len, tmp_len);

        if (ber_len)
    *ber_len += tmp_len;

        result = append (&total, &total_size, out, out_len);
        if (result != ASN1_SUCCESS)
    {
      warn ();
      goto cleanup;
    }

        free (out);
        out = NULL;
      }
  }
    }
  else if (class == ETYPE_CLASS (etype))
    {
      if (ber_len)
  {
    result = asn1_get_length_der (p, der_len, &len_len);
    if (result < 0)
      {
        warn ();
        result = ASN1_DER_ERROR;
        goto cleanup;
      }
    *ber_len += result + len_len;
  }

      /* non-string values are decoded as DER */
      result =
  _asn1_decode_simple_der (etype, der, _der_len, &cout, &out_len,
         dflags);
      if (result != ASN1_SUCCESS)
  {
    warn ();
    goto cleanup;
  }

      result = append (&total, &total_size, cout, out_len);
      if (result != ASN1_SUCCESS)
  {
    warn ();
    goto cleanup;
  }
    }
  else
    {
      warn ();
      result = ASN1_DER_ERROR;
      goto cleanup;
    }

  *str = total;
  *str_len = total_size;

  return ASN1_SUCCESS;
cleanup:
  free (out);
  free (total);
  return result;
}

/**
 * asn1_decode_simple_ber:
 * @etype: The type of the string to be encoded (ASN1_ETYPE_)
 * @der: the encoded string
 * @_der_len: the bytes of the encoded string
 * @str: a pointer to the data
 * @str_len: the length of the data
 * @ber_len: the total length occupied by BER (may be %NULL)
 *
 * Decodes a BER encoded type. The output is an allocated value
 * of the data. This decodes BER STRINGS only. Other types are
 * decoded as DER.
 *
 * Returns: %ASN1_SUCCESS if successful or an error value.
 **/
int
asn1_decode_simple_ber (unsigned int etype, const unsigned char *der,
      unsigned int _der_len, unsigned char **str,
      unsigned int *str_len, unsigned int *ber_len)
{
  return _asn1_decode_simple_ber (etype, der, _der_len, str, str_len, ber_len,
          DECODE_FLAG_HAVE_TAG);
}

Coverage Report

Created: 2026-02-14 06:49