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/*
This file is part of libmicrohttpd
Copyright (C) 2019 Karlson2k (Evgeny Grin)
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>
#include <stddef.h>
/**
* Digest is kept internally as 8 32-bit words.
*/
#define _SHA256_DIGEST_LENGTH 8
/**
* Size of SHA-256 digest in bytes
*/
#define SHA256_DIGEST_SIZE (_SHA256_DIGEST_LENGTH * 4)
/**
* Size of SHA-256 digest string in chars
*/
#define SHA256_DIGEST_STRING_SIZE ((SHA256_DIGEST_SIZE) * 2 + 1)
/**
* Size of single processing block in bytes
*/
#define SHA256_BLOCK_SIZE 64
struct sha256_ctx
{
uint32_t H[_SHA256_DIGEST_LENGTH]; /**< Intermediate hash value / digest at end of calculation */
uint64_t count; /**< number of bytes, mod 2^64 */
uint8_t buffer[SHA256_BLOCK_SIZE]; /**< SHA256 input data buffer */
};
/**
* Initialise structure for SHA256 calculation.
*
* @param ctx_ must be a `struct sha256_ctx *`
*/
void
MHD_SHA256_init (void *ctx_);
/**
* Process portion of bytes.
*
* @param ctx_ must be a `struct sha256_ctx *`
* @param data bytes to add to hash
* @param length number of bytes in @a data
*/
void
MHD_SHA256_update (void *ctx_,
const uint8_t *data,
size_t length);
/**
* Finalise SHA256 calculation, return digest.
*
* @param ctx_ must be a `struct sha256_ctx *`
* @param[out] digest set to the hash, must be #SHA256_DIGEST_SIZE bytes
*/
void
sha256_finish (void *ctx_,
uint8_t digest[SHA256_DIGEST_SIZE]);
#endif /* MHD_SHA256_H */
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