/*
 * 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 <openssl/x509.h>

#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/digest.h>
#include <openssl/obj.h>

#include "../asn1/internal.h"


ASN1_SEQUENCE(X509_ALGOR) = {
    ASN1_SIMPLE(X509_ALGOR, algorithm, ASN1_OBJECT),
    ASN1_OPT(X509_ALGOR, parameter, ASN1_ANY),
} ASN1_SEQUENCE_END(X509_ALGOR)

IMPLEMENT_ASN1_FUNCTIONS_const(X509_ALGOR)
IMPLEMENT_ASN1_DUP_FUNCTION_const(X509_ALGOR)

int X509_ALGOR_set0(X509_ALGOR *alg, ASN1_OBJECT *aobj, int ptype, void *pval) {
  if (!alg) {
    return 0;
  }
  if (ptype != V_ASN1_UNDEF) {
    if (alg->parameter == NULL) {
      alg->parameter = ASN1_TYPE_new();
    }
    if (alg->parameter == NULL) {
      return 0;
    }
  }
  if (alg) {
    ASN1_OBJECT_free(alg->algorithm);
    alg->algorithm = aobj;
  }
  if (ptype == 0) {
    return 1;
  }
  if (ptype == V_ASN1_UNDEF) {
    if (alg->parameter) {
      ASN1_TYPE_free(alg->parameter);
      alg->parameter = NULL;
    }
  } else {
    ASN1_TYPE_set(alg->parameter, ptype, pval);
  }
  return 1;
}

void X509_ALGOR_get0(const ASN1_OBJECT **out_obj, int *out_param_type,
                     const void **out_param_value, const X509_ALGOR *alg) {
  if (out_obj != NULL) {
    *out_obj = alg->algorithm;
  }
  if (out_param_type != NULL) {
    int type = V_ASN1_UNDEF;
    const void *value = NULL;
    if (alg->parameter != NULL) {
      type = alg->parameter->type;
      value = asn1_type_value_as_pointer(alg->parameter);
    }
    *out_param_type = type;
    if (out_param_value != NULL) {
      *out_param_value = value;
    }
  }
}

// Set up an X509_ALGOR DigestAlgorithmIdentifier from an EVP_MD

void X509_ALGOR_set_md(X509_ALGOR *alg, const EVP_MD *md) {
  int param_type;

  if (EVP_MD_flags(md) & EVP_MD_FLAG_DIGALGID_ABSENT) {
    param_type = V_ASN1_UNDEF;
  } else {
    param_type = V_ASN1_NULL;
  }

  X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_MD_type(md)), param_type, NULL);
}

// X509_ALGOR_cmp returns 0 if |a| and |b| are equal and non-zero otherwise.
int X509_ALGOR_cmp(const X509_ALGOR *a, const X509_ALGOR *b) {
  int rv;
  rv = OBJ_cmp(a->algorithm, b->algorithm);
  if (rv) {
    return rv;
  }
  if (!a->parameter && !b->parameter) {
    return 0;
  }
  return ASN1_TYPE_cmp(a->parameter, b->parameter);
}