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/*
This file is part of libmicrohttpd
Copyright (C) 2019-2022 Evgeny Grin (Karlson2k)
This library 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/>.
*/
/**
* @file microhttpd/sha256.h
* @brief Calculation of SHA-256 digest
* @author Karlson2k (Evgeny Grin)
*/
#ifndef MHD_SHA256_H
#define MHD_SHA256_H 1
#include "mhd_options.h"
#include <stdint.h>
#ifdef HAVE_STDDEF_H
#include <stddef.h> /* for size_t */
#endif /* HAVE_STDDEF_H */
/**
* Digest is kept internally as 8 32-bit words.
*/
#define SHA256_DIGEST_SIZE_WORDS 8
/**
* Number of bits in single SHA-256 word
*/
#define SHA256_WORD_SIZE_BITS 32
/**
* Number of bytes in single SHA-256 word
* used to process data
*/
#define SHA256_BYTES_IN_WORD (SHA256_WORD_SIZE_BITS / 8)
/**
* Size of SHA-256 digest in bytes
*/
#define SHA256_DIGEST_SIZE (SHA256_DIGEST_SIZE_WORDS * SHA256_BYTES_IN_WORD)
/**
* Size of SHA-256 digest string in chars including termination NUL
*/
#define SHA256_DIGEST_STRING_SIZE ((SHA256_DIGEST_SIZE) * 2 + 1)
/**
* Size of single processing block in bits
*/
#define SHA256_BLOCK_SIZE_BITS 512
/**
* Size of single processing block in bytes
*/
#define SHA256_BLOCK_SIZE (SHA256_BLOCK_SIZE_BITS / 8)
/**
* Size of single processing block in bytes
*/
#define SHA256_BLOCK_SIZE_WORDS (SHA256_BLOCK_SIZE_BITS / SHA256_WORD_SIZE_BITS)
struct Sha256Ctx
{
uint32_t H[SHA256_DIGEST_SIZE_WORDS]; /**< Intermediate hash value / digest at end of calculation */
uint32_t buffer[SHA256_BLOCK_SIZE_WORDS]; /**< SHA256 input data buffer */
uint64_t count; /**< number of bytes, mod 2^64 */
};
/**
* Initialise structure for SHA256 calculation.
*
* @param ctx must be a `struct Sha256Ctx *`
*/
void
MHD_SHA256_init (struct Sha256Ctx *ctx);
/**
* Process portion of bytes.
*
* @param ctx must be a `struct Sha256Ctx *`
* @param data bytes to add to hash
* @param length number of bytes in @a data
*/
void
MHD_SHA256_update (struct Sha256Ctx *ctx,
const uint8_t *data,
size_t length);
/**
* Finalise SHA256 calculation, return digest.
*
* @param ctx must be a `struct Sha256Ctx *`
* @param[out] digest set to the hash, must be #SHA256_DIGEST_SIZE bytes
*/
void
MHD_SHA256_finish (struct Sha256Ctx *ctx,
uint8_t digest[SHA256_DIGEST_SIZE]);
#endif /* MHD_SHA256_H */
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