libmicrohttpd2

HTTP server C library (MHD 2.x, alpha)
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sha256_ext_openssl.c (4496B)

      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/sha256_ext_openssl.c
     41  * @brief  Wrapper for SHA-256 calculation performed by OpenSSL library
     42  * @author Christian Grothoff
     43  */
     44 
     45 #include <openssl/evp.h>
     46 #define MHD_SHA256_Context EVP_MD_CTX
     47 #include "sha256_ext.h"
     48 #include "mhd_assert.h"
     49 
     50 
     51 /**
     52  * Initialise structure for SHA-256 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_SHA256_init_one_time (struct mhd_Sha256CtxExt *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_sha256 (),
     70                               NULL))
     71   {
     72     ctx->ext_error = 1; /* Initialization failure */
     73     mhd_SHA256_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_SHA256_update (struct mhd_Sha256CtxExt *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 SHA-256 calculation, return digest, reset hash calculation.
    109  *
    110  * @param ctx the calculation context
    111  * @param[out] digest set to the hash, must be #mhd_SHA256_DIGEST_SIZE bytes
    112  */
    113 void
    114 mhd_SHA256_finish_reset (struct mhd_Sha256CtxExt *ctx,
    115                          uint8_t digest[mhd_SHA256_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   }
    127   else
    128   {
    129     mhd_assert (mhd_SHA256_DIGEST_SIZE == len);
    130     /* Reset for potential reuse */
    131     if (1 != EVP_DigestInit_ex (ctx->handle,
    132                                 EVP_sha256 (),
    133                                 NULL))
    134     {
    135       ctx->ext_error = 1;
    136       mhd_SHA256_deinit (ctx);
    137     }
    138   }
    139 }
    140 
    141 
    142 /**
    143  * Free allocated resources.
    144  *
    145  * @param ctx the calculation context
    146  */
    147 void
    148 mhd_SHA256_deinit (struct mhd_Sha256CtxExt *ctx)
    149 {
    150   if (NULL != ctx->handle)
    151   {
    152     EVP_MD_CTX_free (ctx->handle);
    153     ctx->handle = NULL;
    154   }
    155 }