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/* sntrup761.h - Streamlined NTRU Prime sntrup761 key-encapsulation method
* Copyright (C) 2023 Simon Josefsson <simon@josefsson.org>
*
* This file is part of Libgcrypt.
*
* Libgcrypt 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.
*
* Libgcrypt 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 program; if not, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* For a description of the algorithm, see:
* https://ntruprime.cr.yp.to/
*/
/*
* Derived from public domain source, written by (in alphabetical order):
* - Daniel J. Bernstein
* - Chitchanok Chuengsatiansup
* - Tanja Lange
* - Christine van Vredendaal
*/
#ifndef SNTRUP761_H
#define SNTRUP761_H
#include <string.h>
#include <stdint.h>
#ifdef _GCRYPT_IN_LIBGCRYPT
/**** Start of the glue code to libgcrypt ****/
#include "gcrypt-int.h"
static inline void
crypto_hash_sha512 (unsigned char *out,
const unsigned char *in, size_t inlen)
{
_gcry_md_hash_buffer (GCRY_MD_SHA512, out, in, inlen);
}
#define sntrup761_keypair _gcry_sntrup761_keypair
#define sntrup761_enc _gcry_sntrup761_enc
#define sntrup761_dec _gcry_sntrup761_dec
/**** End of the glue code ****/
#else
#define SNTRUP761_SECRETKEY_SIZE 1763
#define SNTRUP761_PUBLICKEY_SIZE 1158
#define SNTRUP761_CIPHERTEXT_SIZE 1039
#define SNTRUP761_SIZE 32
#endif
typedef void sntrup761_random_func (void *ctx, size_t length, uint8_t *dst);
void
sntrup761_keypair (uint8_t *pk, uint8_t *sk,
void *random_ctx, sntrup761_random_func *random);
void
sntrup761_enc (uint8_t *c, uint8_t *k, const uint8_t *pk,
void *random_ctx, sntrup761_random_func *random);
void
sntrup761_dec (uint8_t *k, const uint8_t *c, const uint8_t *sk);
#endif /* SNTRUP761_H */
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