/*

 * Copyright 1998-2020 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stddef.h>

#include <openssl/x509.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include "crypto/evp.h"

ASN1_SEQUENCE(X509_ALGOR) = {

        ASN1_SIMPLE(X509_ALGOR, algorithm, ASN1_OBJECT),

        ASN1_OPT(X509_ALGOR, parameter, ASN1_ANY)

} ASN1_SEQUENCE_END(X509_ALGOR)

ASN1_ITEM_TEMPLATE(X509_ALGORS) =

        ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, algorithms, X509_ALGOR)

ASN1_ITEM_TEMPLATE_END(X509_ALGORS)

IMPLEMENT_ASN1_FUNCTIONS(X509_ALGOR)

IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(X509_ALGORS, X509_ALGORS, X509_ALGORS)

IMPLEMENT_ASN1_DUP_FUNCTION(X509_ALGOR)

int X509_ALGOR_set0(X509_ALGOR *alg, ASN1_OBJECT *aobj, int ptype, void *pval)

{

    if (alg == NULL)

        return 0;

    if (ptype != V_ASN1_UNDEF) {

        if (alg->parameter == NULL)

            alg->parameter = ASN1_TYPE_new();

        if (alg->parameter == NULL)

            return 0;

    }

    ASN1_OBJECT_free(alg->algorithm);

    alg->algorithm = aobj;

    if (ptype == 0)

        return 1;

    if (ptype == V_ASN1_UNDEF) {

        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 **paobj, int *pptype,

                     const void **ppval, const X509_ALGOR *algor)

{

    if (paobj)

        *paobj = algor->algorithm;

    if (pptype) {

        if (algor->parameter == NULL) {

            *pptype = V_ASN1_UNDEF;

            return;

        } else

            *pptype = algor->parameter->type;

        if (ppval)

            *ppval = algor->parameter->value.ptr;

    }

}

/* 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 (md->flags & 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);

}

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);

}

int X509_ALGOR_copy(X509_ALGOR *dest, const X509_ALGOR *src)

{

    if (src == NULL || dest == NULL)

  return 0;

    if (dest->algorithm)

         ASN1_OBJECT_free(dest->algorithm);

    dest->algorithm = NULL;

    if (dest->parameter)

        ASN1_TYPE_free(dest->parameter);

    dest->parameter = NULL;

    if (src->algorithm)

        if ((dest->algorithm = OBJ_dup(src->algorithm)) == NULL)

      return 0;

    if (src->parameter) {

        dest->parameter = ASN1_TYPE_new();

        if (dest->parameter == NULL)

            return 0;

        /* Assuming this is also correct for a BOOL.

         * set does copy as a side effect.

         */

        if (ASN1_TYPE_set1(dest->parameter, 

                src->parameter->type, src->parameter->value.ptr) == 0)

            return 0;

    }

    return 1;

}