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/*
This file is part of GNU libmicrohttpd
Copyright (C) 2022-2023 Evgeny Grin (Karlson2k)
GNU libmicrohttpd is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with GNU libmicrohttpd.
If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file microhttpd/md5_ext.c
* @brief Wrapper for MD5 calculation performed by TLS library
* @author Karlson2k (Evgeny Grin)
*/
#include <gnutls/crypto.h>
#include "md5_ext.h"
#include "mhd_assert.h"
/**
* Initialise structure for MD5 calculation, allocate resources.
*
* This function must not be called more than one time for @a ctx.
*
* @param ctx the calculation context
*/
void
MHD_MD5_init_one_time (struct Md5CtxExt *ctx)
{
ctx->handle = NULL;
ctx->ext_error = gnutls_hash_init (&ctx->handle,
GNUTLS_DIG_MD5);
if ((0 != ctx->ext_error) && (NULL != ctx->handle))
{
/* GnuTLS may return initialisation error and set the handle at the
same time. Such handle cannot be used for calculations.
Note: GnuTLS may also return an error and NOT set the handle. */
gnutls_free (ctx->handle);
ctx->handle = NULL;
}
/* If handle is NULL, the error must be set */
mhd_assert ((NULL != ctx->handle) || (0 != ctx->ext_error));
/* If error is set, the handle must be NULL */
mhd_assert ((0 == ctx->ext_error) || (NULL == ctx->handle));
}
/**
* Process portion of bytes.
*
* @param ctx the calculation context
* @param data bytes to add to hash
* @param length number of bytes in @a data
*/
void
MHD_MD5_update (struct Md5CtxExt *ctx,
const uint8_t *data,
size_t length)
{
if (0 == ctx->ext_error)
ctx->ext_error = gnutls_hash (ctx->handle, data, length);
}
/**
* Finalise MD5 calculation, return digest, reset hash calculation.
*
* @param ctx the calculation context
* @param[out] digest set to the hash, must be #MD5_DIGEST_SIZE bytes
*/
void
MHD_MD5_finish_reset (struct Md5CtxExt *ctx,
uint8_t digest[MD5_DIGEST_SIZE])
{
if (0 == ctx->ext_error)
gnutls_hash_output (ctx->handle, digest);
}
/**
* Free allocated resources.
*
* @param ctx the calculation context
*/
void
MHD_MD5_deinit (struct Md5CtxExt *ctx)
{
if (NULL != ctx->handle)
gnutls_hash_deinit (ctx->handle, NULL);
}
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