/* $OpenBSD: x_bignum.c,v 1.12 2022/07/30 13:42:25 jsing Exp $ */

/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL

 * project 2000.

 */

/* ====================================================================

 * Copyright (c) 2000 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 <stdio.h>

#include <openssl/asn1t.h>

#include <openssl/bn.h>

#include "asn1_locl.h"

#include "bytestring.h"

/*

 * Custom primitive type for that reads an ASN.1 INTEGER into a BIGNUM.

 */

static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);

static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);

static void bn_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);

static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,

    const ASN1_ITEM *it);

static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,

    int utype, char *free_cont, const ASN1_ITEM *it);

static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,

    int indent, const ASN1_PCTX *pctx);

static ASN1_PRIMITIVE_FUNCS bignum_pf = {

  .app_data = NULL,

  .flags = 0,

  .prim_new = bn_new,

  .prim_free = bn_free,

  .prim_clear = bn_clear,

  .prim_c2i = bn_c2i,

  .prim_i2c = bn_i2c,

  .prim_print = bn_print,

};

const ASN1_ITEM BIGNUM_it = {

        .itype = ASN1_ITYPE_PRIMITIVE,

        .utype = V_ASN1_INTEGER,

        .templates = NULL,

        .tcount = 0,

        .funcs = &bignum_pf,

        .size = 0,

        .sname = "BIGNUM",

};

const ASN1_ITEM CBIGNUM_it = {

        .itype = ASN1_ITYPE_PRIMITIVE,

        .utype = V_ASN1_INTEGER,

        .templates = NULL,

        .tcount = 0,

        .funcs = &bignum_pf,

        .size = 0,

        .sname = "BIGNUM",

};

static int

bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  if ((*pval = (ASN1_VALUE *)BN_new()) == NULL)

    return 0;

  return 1;

}

static void

bn_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  BN_free((BIGNUM *)*pval);

  *pval = NULL;

}

static void

bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  if (*pval == NULL)

    return;

  bn_clear(pval, it);

}

static int

bn_i2c(ASN1_VALUE **pval, unsigned char *content, int *putype, const ASN1_ITEM *it)

{

  ASN1_INTEGER *aint = NULL;

  unsigned char **pp = NULL;

  const BIGNUM *bn;

  int ret;

  if (*pval == NULL)

    return -1;

  bn = (const BIGNUM *)*pval;

  if ((aint = BN_to_ASN1_INTEGER(bn, NULL)) == NULL)

    return -1;

  if (content != NULL)

    pp = &content;

  ret = i2c_ASN1_INTEGER(aint, pp);

  ASN1_INTEGER_free(aint);

  return ret;

}

static int

bn_c2i(ASN1_VALUE **pval, const unsigned char *content, int len, int utype,

    char *free_content, const ASN1_ITEM *it)

{

  ASN1_INTEGER *aint = NULL;

  BIGNUM *bn;

  CBS cbs;

  int ret = 0;

  bn_clear(pval, it);

  if (len < 0)

    goto err;

  CBS_init(&cbs, content, len);

  if (!c2i_ASN1_INTEGER_cbs(&aint, &cbs))

    goto err;

  if ((bn = ASN1_INTEGER_to_BN(aint, NULL)) == NULL)

    goto err;

  *pval = (ASN1_VALUE *)bn;

  ret = 1;

 err:

  ASN1_INTEGER_free(aint);

  return ret;

}

static int

bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent,

    const ASN1_PCTX *pctx)

{

  const BIGNUM *bn = (BIGNUM *)*pval;

  if (!BN_print(out, bn))

    return 0;

  if (BIO_printf(out, "\n") <= 0)

    return 0;

  return 1;

}