/*

 * Copyright 1995-2021 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

 */

/* We need to use some engine deprecated APIs */

#define OPENSSL_SUPPRESS_DEPRECATED

#include <stdio.h>

#include <time.h>

#include <sys/types.h>

#include "internal/cryptlib.h"

#include <openssl/engine.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/buffer.h>

#include <openssl/x509.h>

#include "crypto/x509.h"

#ifndef OPENSSL_NO_DEPRECATED_3_0

int ASN1_digest(i2d_of_void *i2d, const EVP_MD *type, char *data,

                unsigned char *md, unsigned int *len)

{

    int inl;

    unsigned char *str, *p;

    inl = i2d(data, NULL);

    if (inl <= 0) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);

        return 0;

    }

    if ((str = OPENSSL_malloc(inl)) == NULL) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);

        return 0;

    }

    p = str;

    i2d(data, &p);

    if (!EVP_Digest(str, inl, md, len, type, NULL)) {

        OPENSSL_free(str);

        return 0;

    }

    OPENSSL_free(str);

    return 1;

}

#endif

int ossl_asn1_item_digest_ex(const ASN1_ITEM *it, const EVP_MD *md, void *asn,

                             unsigned char *data, unsigned int *len,

                             OSSL_LIB_CTX *libctx, const char *propq)

{

    int i, ret = 0;

    unsigned char *str = NULL;

    EVP_MD *fetched_md = (EVP_MD *)md;

    i = ASN1_item_i2d(asn, &str, it);

    if (i < 0 || str == NULL)

        return 0;

    if (EVP_MD_get0_provider(md) == NULL) {

#if !defined(OPENSSL_NO_ENGINE)

        ENGINE *tmpeng = ENGINE_get_digest_engine(EVP_MD_get_type(md));

        if (tmpeng != NULL)

            ENGINE_finish(tmpeng);

        else

#endif

            fetched_md = EVP_MD_fetch(libctx, EVP_MD_get0_name(md), propq);

    }

    if (fetched_md == NULL)

        goto err;

    ret = EVP_Digest(str, i, data, len, fetched_md, NULL);

err:

    OPENSSL_free(str);

    if (fetched_md != md)

        EVP_MD_free(fetched_md);

    return ret;

}

int ASN1_item_digest(const ASN1_ITEM *it, const EVP_MD *md, void *asn,

                     unsigned char *data, unsigned int *len)

{

    return ossl_asn1_item_digest_ex(it, md, asn, data, len, NULL, NULL);

}