/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2013-2021 Todd C. Miller <Todd.Miller@sudo.ws>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

/*

 * This is an open source non-commercial project. Dear PVS-Studio, please check it.

 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com

 */

#include <config.h>

#include <stdlib.h>

#include <errno.h>

#if defined(HAVE_WOLFSSL)

# include <wolfssl/options.h>

#endif

#include <openssl/evp.h>

#include "sudo_compat.h"

#include "sudo_debug.h"

#include "sudo_digest.h"

struct sudo_digest {

    EVP_MD_CTX *ctx;

    const EVP_MD *md;

};

static const EVP_MD *

sudo_digest_type_to_md(int digest_type)

{

    const EVP_MD *md = NULL;

    debug_decl(sudo_digest_type_to_md, SUDO_DEBUG_UTIL);

    switch (digest_type) {

    case SUDO_DIGEST_SHA224:

  md = EVP_sha224();

  break;

    case SUDO_DIGEST_SHA256:

  md = EVP_sha256();

  break;

    case SUDO_DIGEST_SHA384:

  md = EVP_sha384();

  break;

    case SUDO_DIGEST_SHA512:

  md = EVP_sha512();

  break;

    default:

  errno = EINVAL;

  break;

    }

    debug_return_const_ptr(md);

}

struct sudo_digest *

sudo_digest_alloc_v1(int digest_type)

{

    struct sudo_digest *dig;

    EVP_MD_CTX *mdctx = NULL;

    const EVP_MD *md;

    debug_decl(sudo_digest_alloc, SUDO_DEBUG_UTIL);

    md = sudo_digest_type_to_md(digest_type);

    if (md == NULL)

  goto bad;

    mdctx = EVP_MD_CTX_new();

    if (mdctx == NULL || !EVP_DigestInit_ex(mdctx, md, NULL))

  goto bad;

    if ((dig = malloc(sizeof(*dig))) == NULL)

  goto bad;

    dig->md = md;

    dig->ctx = mdctx;

    debug_return_ptr(dig);

bad:

    EVP_MD_CTX_free(mdctx);

    debug_return_ptr(NULL);

}

void

sudo_digest_free_v1(struct sudo_digest *dig)

{

    debug_decl(sudo_digest_free, SUDO_DEBUG_UTIL);

    if (dig != NULL) {

  EVP_MD_CTX_free(dig->ctx);

  free(dig);

    }

    debug_return;

}

void

sudo_digest_reset_v1(struct sudo_digest *dig)

{

    debug_decl(sudo_digest_reset, SUDO_DEBUG_UTIL);

    /* These cannot fail. */

    EVP_MD_CTX_reset(dig->ctx);

    EVP_DigestInit_ex(dig->ctx, dig->md, NULL);

    debug_return;

}

int

sudo_digest_getlen_v1(int digest_type)

{

    const EVP_MD *md;

    debug_decl(sudo_digest_getlen, SUDO_DEBUG_UTIL);

    md = sudo_digest_type_to_md(digest_type);

    if (md == NULL)

  debug_return_int(-1);

    debug_return_int(EVP_MD_size(md));

}

void

sudo_digest_update_v1(struct sudo_digest *dig, const void *data, size_t len)

{

    debug_decl(sudo_digest_update, SUDO_DEBUG_UTIL);

    EVP_DigestUpdate(dig->ctx, data, len);

    debug_return;

}

void

sudo_digest_final_v1(struct sudo_digest *dig, unsigned char *md)

{

    debug_decl(sudo_digest_final, SUDO_DEBUG_UTIL);

    EVP_DigestFinal_ex(dig->ctx, md, NULL);

    debug_return;

}