libmicrohttpd2

HTTP server C library (MHD 2.x, alpha)
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md5_ext_openssl.c (4404B)

      1 /* SPDX-License-Identifier: LGPL-2.1-or-later OR (GPL-2.0-or-later WITH eCos-exception-2.0) */
      2 /*
      3   This file is part of GNU libmicrohttpd.
      4   Copyright (C) 2025 Christian Grothoff
      5 
      6   GNU libmicrohttpd is free software; you can redistribute it and/or
      7   modify it under the terms of the GNU Lesser General Public
      8   License as published by the Free Software Foundation; either
      9   version 2.1 of the License, or (at your option) any later version.
     10 
     11   GNU libmicrohttpd is distributed in the hope that it will be useful,
     12   but WITHOUT ANY WARRANTY; without even the implied warranty of
     13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14   Lesser General Public License for more details.
     15 
     16   Alternatively, you can redistribute GNU libmicrohttpd and/or
     17   modify it under the terms of the GNU General Public License as
     18   published by the Free Software Foundation; either version 2 of
     19   the License, or (at your option) any later version, together
     20   with the eCos exception, as follows:
     21 
     22     As a special exception, if other files instantiate templates or
     23     use macros or inline functions from this file, or you compile this
     24     file and link it with other works to produce a work based on this
     25     file, this file does not by itself cause the resulting work to be
     26     covered by the GNU General Public License. However the source code
     27     for this file must still be made available in accordance with
     28     section (3) of the GNU General Public License v2.
     29 
     30     This exception does not invalidate any other reasons why a work
     31     based on this file might be covered by the GNU General Public
     32     License.
     33 
     34   You should have received copies of the GNU Lesser General Public
     35   License and the GNU General Public License along with this library;
     36   if not, see <https://www.gnu.org/licenses/>.
     37 */
     38 
     39 /**
     40  * @file microhttpd/md5_ext_openssl.c
     41  * @brief  Wrapper for MD5 calculation performed by OpenSSL library
     42  * @author Christian grothoff
     43  */
     44 
     45 #include <openssl/evp.h>
     46 #define MHD_MD5_Context EVP_MD_CTX
     47 #include "md5_ext.h"
     48 #include "mhd_assert.h"
     49 
     50 
     51 /**
     52  * Initialise structure for MD5 calculation, allocate resources.
     53  *
     54  * This function must not be called more than one time for @a ctx.
     55  *
     56  * @param ctx the calculation context
     57  */
     58 void
     59 mhd_MD5_init_one_time (struct mhd_Md5CtxExt *ctx)
     60 {
     61   ctx->ext_error = 0;
     62   ctx->handle = EVP_MD_CTX_new ();
     63   if (NULL == ctx->handle)
     64   {
     65     ctx->ext_error = 1; /* Allocation failure */
     66     return;
     67   }
     68   if (1 != EVP_DigestInit_ex (ctx->handle,
     69                               EVP_md5 (),
     70                               NULL))
     71   {
     72     ctx->ext_error = 1; /* Initialization failure */
     73     mhd_MD5_deinit (ctx);
     74   }
     75 
     76   /* If handle is NULL, the error must be set */
     77   mhd_assert ((NULL != ctx->handle) || (0 != ctx->ext_error));
     78   /* If error is set, the handle must be NULL */
     79   mhd_assert ((0 == ctx->ext_error) || (NULL == ctx->handle));
     80 }
     81 
     82 
     83 /**
     84  * Process portion of bytes.
     85  *
     86  * @param ctx the calculation context
     87  * @param size number of bytes in @a data, must not be 0
     88  * @param data bytes to add to hash
     89  */
     90 void
     91 mhd_MD5_update (struct mhd_Md5CtxExt *ctx,
     92                 size_t size,
     93                 const uint8_t *data)
     94 {
     95   mhd_assert (0 != size);
     96 
     97   if (0 == ctx->ext_error)
     98   {
     99     if (1 != EVP_DigestUpdate (ctx->handle,
    100                                data,
    101                                size))
    102       ctx->ext_error = 1;
    103   }
    104 }
    105 
    106 
    107 /**
    108  * Finalise MD5 calculation, return digest, reset hash calculation.
    109  *
    110  * @param ctx the calculation context
    111  * @param[out] digest set to the hash, must be #mhd_MD5_DIGEST_SIZE bytes
    112  */
    113 void
    114 mhd_MD5_finish_reset (struct mhd_Md5CtxExt *ctx,
    115                       uint8_t digest[mhd_MD5_DIGEST_SIZE])
    116 {
    117   unsigned int len;
    118 
    119   if (0 != ctx->ext_error)
    120     return;
    121   if (1 != EVP_DigestFinal_ex (ctx->handle,
    122                                digest,
    123                                &len))
    124   {
    125     ctx->ext_error = 1;
    126     return;
    127   }
    128   mhd_assert (mhd_MD5_DIGEST_SIZE == len);
    129   /* Reset for potential reuse */
    130   if (1 != EVP_DigestInit_ex (ctx->handle,
    131                               EVP_md5 (),
    132                               NULL))
    133   {
    134     ctx->ext_error = 1;
    135     mhd_MD5_deinit (ctx);
    136   }
    137 }
    138 
    139 
    140 /**
    141  * Free allocated resources.
    142  *
    143  * @param[in] ctx the calculation context
    144  */
    145 void
    146 mhd_MD5_deinit (struct mhd_Md5CtxExt *ctx)
    147 {
    148   if (NULL != ctx->handle)
    149   {
    150     EVP_MD_CTX_free (ctx->handle);
    151     ctx->handle = NULL;
    152   }
    153 }