sha512_256.h

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/*
     This file is part of GNU libmicrohttpd
     Copyright (C) 2022 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 this library.
     If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef MHD_SHA512_256_H
#define MHD_SHA512_256_H 1

#include "mhd_options.h"
#include <stdint.h>
#ifdef HAVE_STDDEF_H
#include <stddef.h>  /* for size_t */
#endif /* HAVE_STDDEF_H */


#define SHA512_256_WORD_SIZE_BITS 64

#define SHA512_256_BYTES_IN_WORD (SHA512_256_WORD_SIZE_BITS / 8)

#define SHA512_256_HASH_SIZE_WORDS 8

#define SHA512_256_DIGEST_SIZE_WORDS (SHA512_256_HASH_SIZE_WORDS  / 2)

#define SHA512_256_DIGEST_SIZE \
  (SHA512_256_DIGEST_SIZE_WORDS * SHA512_256_BYTES_IN_WORD)

#define SHA512_256_DIGEST_STRING_SIZE ((SHA512_256_DIGEST_SIZE) * 2 + 1)

#define SHA512_256_BLOCK_SIZE_BITS 1024

#define SHA512_256_BLOCK_SIZE (SHA512_256_BLOCK_SIZE_BITS / 8)

#define SHA512_256_BLOCK_SIZE_WORDS \
 (SHA512_256_BLOCK_SIZE_BITS / SHA512_256_WORD_SIZE_BITS)


struct Sha512_256Ctx
{
  uint64_t H[SHA512_256_HASH_SIZE_WORDS];       
  uint64_t buffer[SHA512_256_BLOCK_SIZE_WORDS]; 
  uint64_t count;
  uint64_t count_bits_hi;
};

void
MHD_SHA512_256_init (struct Sha512_256Ctx *ctx);


void
MHD_SHA512_256_update (struct Sha512_256Ctx *ctx,
                       const uint8_t *data,
                       size_t length);


void
MHD_SHA512_256_finish (struct Sha512_256Ctx *ctx,
                       uint8_t digest[SHA512_256_DIGEST_SIZE]);

#endif /* MHD_SHA512_256_H */