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/*
* SPDX-License-Identifier: CC0-1.0
*
* Copyright (C) 2025 W. Kosior <koszko@koszko.org>
*/
#include <stdbool.h>
#include <flint/fmpz.h>
#include <gcrypt.h>
#define PQCRYPTO_HASH_SHAKE256_C
#include "pqcrypto_hash_shake256.h"
struct hash_shake256_state {
bool finished;
gcry_md_hd_t hd;
};
static void * hash_shake256_make(void) {
struct hash_shake256_state * state =
malloc(sizeof(struct hash_shake256_state));
if (!state)
abort();
if (gcry_md_open(&state->hd, GCRY_MD_SHAKE256, GCRY_MD_FLAG_SECURE) !=
GPG_ERR_NO_ERROR)
abort();
state->finished = false;
return state;
}
static void hash_shake256_free(void * state) {
struct hash_shake256_state * state_ = state;
gcry_md_close(state_->hd);
free(state_);
}
static void hash_shake256_feed(void * state, void const * data,
size_t data_bytes) {
struct hash_shake256_state * state_ = state;
if (state_->finished)
abort();
gcry_md_write(state_->hd, data, data_bytes);
}
static int hash_shake256_getc(void * state) {
struct hash_shake256_state * state_ = state;
unsigned char extracted;
state_->finished = true;
gcry_md_extract(state_->hd, 0, &extracted, 1);
return extracted;
}
hash_function_t hash_function_shake256 = {
{
.make = hash_shake256_make,
.free = hash_shake256_free,
.feed = hash_shake256_feed,
.getc = hash_shake256_getc,
}
};
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