/*

 * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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

 */

/*

 * DSA low level APIs are deprecated for public use, but still ok for

 * internal use.

 */

#include "internal/deprecated.h"

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/bn.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/asn1.h>

#include <openssl/rsa.h>

#include <openssl/dsa.h>

#include <openssl/ec.h>

#include "crypto/evp.h"

EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,

                        long length)

{

    EVP_PKEY *ret;

    EVP_PKEY *copy = NULL;

    if ((a == NULL) || (*a == NULL)) {

        if ((ret = EVP_PKEY_new()) == NULL) {

            ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);

            return NULL;

        }

    } else {

        ret = *a;

#ifndef OPENSSL_NO_EC

        if (evp_pkey_is_provided(ret)

            && EVP_PKEY_get_base_id(ret) == EVP_PKEY_EC) {

            if (!evp_pkey_copy_downgraded(&copy, ret))

                goto err;

        }

#endif

    }

    if ((type != EVP_PKEY_get_id(ret) || copy != NULL)

        && !EVP_PKEY_set_type(ret, type)) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);

        goto err;

    }

    switch (EVP_PKEY_get_base_id(ret)) {

    case EVP_PKEY_RSA:

        if ((ret->pkey.rsa = d2i_RSAPublicKey(NULL, pp, length)) == NULL) {

            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

            goto err;

        }

        break;

#ifndef OPENSSL_NO_DSA

    case EVP_PKEY_DSA:

        if (!d2i_DSAPublicKey(&ret->pkey.dsa, pp, length)) {

            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

            goto err;

        }

        break;

#endif

#ifndef OPENSSL_NO_EC

    case EVP_PKEY_EC:

        if (copy != NULL) {

            /* use downgraded parameters from copy */

            ret->pkey.ec = copy->pkey.ec;

            copy->pkey.ec = NULL;

        }

        if (!o2i_ECPublicKey(&ret->pkey.ec, pp, length)) {

            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

            goto err;

        }

        break;

#endif

    default:

        ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);

        goto err;

    }

    if (a != NULL)

        (*a) = ret;

    EVP_PKEY_free(copy);

    return ret;

 err:

    if (a == NULL || *a != ret)

        EVP_PKEY_free(ret);

    EVP_PKEY_free(copy);

    return NULL;

}