libmicrohttpd2

HTTP server C library (MHD 2.x, alpha)
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sha256_ext_gnutls.c (4205B)

      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) 2022-2023 Evgeny Grin (Karlson2k)
      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_gnutls.c
     41  * @brief  Wrapper for SHA-256 calculation performed by GnuTLS library
     42  * @author Karlson2k (Evgeny Grin)
     43  */
     44 #include <gnutls/crypto.h>
     45 #define MHD_SHA256_Context struct hash_hd_st
     46 #include "sha256_ext.h"
     47 #include "mhd_assert.h"
     48 
     49 
     50 /**
     51  * Initialise structure for SHA-256 calculation, allocate resources.
     52  *
     53  * This function must not be called more than one time for @a ctx.
     54  *
     55  * @param ctx the calculation context
     56  */
     57 void
     58 mhd_SHA256_init_one_time (struct mhd_Sha256CtxExt *ctx)
     59 {
     60   ctx->handle = NULL;
     61   ctx->ext_error = gnutls_hash_init (&ctx->handle,
     62                                      GNUTLS_DIG_SHA256);
     63   if ( (0 != ctx->ext_error) &&
     64        (NULL != ctx->handle) )
     65   {
     66     /* GnuTLS may return initialisation error and set the handle at the
     67        same time. Such handle cannot be used for calculations.
     68        Note: GnuTLS may also return an error and NOT set the handle. */
     69     gnutls_free (ctx->handle);
     70     ctx->handle = NULL;
     71   }
     72 
     73   /* If handle is NULL, the error must be set */
     74   mhd_assert ((NULL != ctx->handle) || (0 != ctx->ext_error));
     75   /* If error is set, the handle must be NULL */
     76   mhd_assert ((0 == ctx->ext_error) || (NULL == ctx->handle));
     77 }
     78 
     79 
     80 /**
     81  * Process portion of bytes.
     82  *
     83  * @param ctx the calculation context
     84  * @param size number of bytes in @a data, must not be 0
     85  * @param data bytes to add to hash
     86  */
     87 void
     88 mhd_SHA256_update (struct mhd_Sha256CtxExt *ctx,
     89                    size_t size,
     90                    const uint8_t *data)
     91 {
     92   mhd_assert (0 != size);
     93 
     94   if (0 == ctx->ext_error)
     95     ctx->ext_error = gnutls_hash (ctx->handle,
     96                                   data,
     97                                   size);
     98 }
     99 
    100 
    101 /**
    102  * Finalise SHA-256 calculation, return digest, reset hash calculation.
    103  *
    104  * @param ctx the calculation context
    105  * @param[out] digest set to the hash, must be #mhd_SHA256_DIGEST_SIZE bytes
    106  */
    107 void
    108 mhd_SHA256_finish_reset (struct mhd_Sha256CtxExt *ctx,
    109                          uint8_t digest[mhd_SHA256_DIGEST_SIZE])
    110 {
    111   if (0 == ctx->ext_error)
    112     gnutls_hash_output (ctx->handle,
    113                         digest);
    114 }
    115 
    116 
    117 /**
    118  * Free allocated resources.
    119  *
    120  * @param ctx the calculation context
    121  */
    122 void
    123 mhd_SHA256_deinit (struct mhd_Sha256CtxExt *ctx)
    124 {
    125   if (NULL != ctx->handle)
    126   {
    127     gnutls_hash_deinit (ctx->handle,
    128                         NULL);
    129     ctx->handle = NULL;
    130   }
    131 }