/* $OpenBSD: a_enum.c,v 1.26 2022/08/10 12:06:28 tb Exp $ */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <limits.h>

#include <string.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/bn.h>

#include <openssl/buffer.h>

#include <openssl/err.h>

#include "asn1_locl.h"

#include "bytestring.h"

/*

 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.

 * for comments on encoding see a_int.c

 */

const ASN1_ITEM ASN1_ENUMERATED_it = {

  .itype = ASN1_ITYPE_PRIMITIVE,

  .utype = V_ASN1_ENUMERATED,

  .sname = "ASN1_ENUMERATED",

};

ASN1_ENUMERATED *

ASN1_ENUMERATED_new(void)

{

  return (ASN1_ENUMERATED *)ASN1_item_new(&ASN1_ENUMERATED_it);

}

static void

asn1_aenum_clear(ASN1_ENUMERATED *aenum)

{

  freezero(aenum->data, aenum->length);

  memset(aenum, 0, sizeof(*aenum));

  aenum->type = V_ASN1_ENUMERATED;

}

void

ASN1_ENUMERATED_free(ASN1_ENUMERATED *a)

{

  ASN1_item_free((ASN1_VALUE *)a, &ASN1_ENUMERATED_it);

}

int

ASN1_ENUMERATED_get_int64(int64_t *out_val, const ASN1_ENUMERATED *aenum)

{

  CBS cbs;

  *out_val = 0;

  if (aenum == NULL || aenum->length < 0)

    return 0;

  if (aenum->type != V_ASN1_ENUMERATED &&

      aenum->type != V_ASN1_NEG_ENUMERATED) {

    ASN1error(ASN1_R_WRONG_INTEGER_TYPE);

    return 0;

  }

  CBS_init(&cbs, aenum->data, aenum->length);

  return asn1_aint_get_int64(&cbs, (aenum->type == V_ASN1_NEG_ENUMERATED),

      out_val);

}

int

ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *aenum, int64_t val)

{

  uint64_t uval;

  asn1_aenum_clear(aenum);

  uval = (uint64_t)val;

  if (val < 0) {

    aenum->type = V_ASN1_NEG_ENUMERATED;

    uval = -uval;

  }

  return asn1_aint_set_uint64(uval, &aenum->data, &aenum->length);

}

long

ASN1_ENUMERATED_get(const ASN1_ENUMERATED *aenum)

{

  int64_t val;

  if (aenum == NULL)

    return 0;

  if (!ASN1_ENUMERATED_get_int64(&val, aenum))

    return -1;

  if (val < LONG_MIN || val > LONG_MAX) {

    /* hmm... a bit ugly, return all ones */

    return -1;

  }

  return (long)val;

}

int

ASN1_ENUMERATED_set(ASN1_ENUMERATED *aenum, long val)

{

  return ASN1_ENUMERATED_set_int64(aenum, val);

}

ASN1_ENUMERATED *

BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai)

{

  ASN1_ENUMERATED *ret;

  int len, j;

  if (ai == NULL)

    ret = ASN1_ENUMERATED_new();

  else

    ret = ai;

  if (ret == NULL) {

    ASN1error(ERR_R_NESTED_ASN1_ERROR);

    goto err;

  }

  if (BN_is_negative(bn))

    ret->type = V_ASN1_NEG_ENUMERATED;

  else

    ret->type = V_ASN1_ENUMERATED;

  j = BN_num_bits(bn);

  len = ((j == 0) ? 0 : ((j / 8) + 1));

  if (ret->length < len + 4) {

    unsigned char *new_data = realloc(ret->data, len + 4);

    if (!new_data) {

      ASN1error(ERR_R_MALLOC_FAILURE);

      goto err;

    }

    ret->data = new_data;

  }

  ret->length = BN_bn2bin(bn, ret->data);

  /* Correct zero case */

  if (!ret->length) {

    ret->data[0] = 0;

    ret->length = 1;

  }

  return (ret);

 err:

  if (ret != ai)

    ASN1_ENUMERATED_free(ret);

  return (NULL);

}

BIGNUM *

ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn)

{

  BIGNUM *ret;

  if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)

    ASN1error(ASN1_R_BN_LIB);

  else if (ai->type == V_ASN1_NEG_ENUMERATED)

    BN_set_negative(ret, 1);

  return (ret);

}

/* Based on a_int.c: equivalent ENUMERATED functions */

int

i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a)

{

  int i, n = 0;

  static const char h[] = "0123456789ABCDEF";

  char buf[2];

  if (a == NULL)

    return (0);

  if (a->length == 0) {

    if (BIO_write(bp, "00", 2) != 2)

      goto err;

    n = 2;

  } else {

    for (i = 0; i < a->length; i++) {

      if ((i != 0) && (i % 35 == 0)) {

        if (BIO_write(bp, "\\\n", 2) != 2)

          goto err;

        n += 2;

      }

      buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];

      buf[1] = h[((unsigned char)a->data[i]) & 0x0f];

      if (BIO_write(bp, buf, 2) != 2)

        goto err;

      n += 2;

    }

  }

  return (n);

 err:

  return (-1);

}

int

a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)

{

  int ret = 0;

  int i, j,k, m,n, again, bufsize;

  unsigned char *s = NULL, *sp;

  unsigned char *bufp;

  int first = 1;

  size_t num = 0, slen = 0;

  bs->type = V_ASN1_ENUMERATED;

  bufsize = BIO_gets(bp, buf, size);

  for (;;) {

    if (bufsize < 1)

      goto err_sl;

    i = bufsize;

    if (buf[i-1] == '\n')

      buf[--i] = '\0';

    if (i == 0)

      goto err_sl;

    if (buf[i-1] == '\r')

      buf[--i] = '\0';

    if (i == 0)

      goto err_sl;

    if (buf[i - 1] == '\\') {

      i--;

      again = 1;

    } else

      again = 0;

    buf[i] = '\0';

    if (i < 2)

      goto err_sl;

    bufp = (unsigned char *)buf;

    if (first) {

      first = 0;

      if ((bufp[0] == '0') && (buf[1] == '0')) {

        bufp += 2;

        i -= 2;

      }

    }

    k = 0;

    if (i % 2 != 0) {

      ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);

      goto err;

    }

    i /= 2;

    if (num + i > slen) {

      sp = realloc(s, num + i);

      if (sp == NULL) {

        ASN1error(ERR_R_MALLOC_FAILURE);

        goto err;

      }

      s = sp;

      slen = num + i;

    }

    for (j = 0; j < i; j++, k += 2) {

      for (n = 0; n < 2; n++) {

        m = bufp[k + n];

        if ((m >= '0') && (m <= '9'))

          m -= '0';

        else if ((m >= 'a') && (m <= 'f'))

          m = m - 'a' + 10;

        else if ((m >= 'A') && (m <= 'F'))

          m = m - 'A' + 10;

        else {

          ASN1error(ASN1_R_NON_HEX_CHARACTERS);

          goto err;

        }

        s[num + j] <<= 4;

        s[num + j] |= m;

      }

    }

    num += i;

    if (again)

      bufsize = BIO_gets(bp, buf, size);

    else

      break;

  }

  bs->length = num;

  bs->data = s;

  return (1);

 err_sl:

  ASN1error(ASN1_R_SHORT_LINE);

 err:

  free(s);

  return (ret);

}

int

i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **out)

{

  return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_ENUMERATED_it);

}

ASN1_ENUMERATED *

d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, const unsigned char **in, long len)

{

  return (ASN1_ENUMERATED *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,

      &ASN1_ENUMERATED_it);

}