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///////////////////////////////////////////////////////////////////////////////
// esch_cfg.h: Configuration of instances of hash function ESCH.             //
// This file is part of the SPARKLE submission to NIST's LW Crypto Project.  //
// Version 1.1.2 (2020-10-30), see <http://www.cryptolux.org/> for updates.  //
// Authors: The SPARKLE Group (C. Beierle, A. Biryukov, L. Cardoso dos       //
// Santos, J. Groszschaedl, L. Perrin, A. Udovenko, V. Velichkov, Q. Wang).  //
// License: GPLv3 (see LICENSE file), other licenses available upon request. //
// Copyright (C) 2019-2020 University of Luxembourg <http://www.uni.lu/>.    //
// ------------------------------------------------------------------------- //
// This program is free software: you can redistribute it and/or modify it   //
// under the terms of the GNU General Public License as published by the     //
// Free Software Foundation, either version 3 of the License, or (at your    //
// option) any later version. This program 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 General Public License for more details. You should have received a   //
// copy of the GNU General Public License along with this program. If not,   //
// see <http://www.gnu.org/licenses/>.                                       //
///////////////////////////////////////////////////////////////////////////////


#ifndef ESCH_CFG_H
#define ESCH_CFG_H

// Define the ESCH instance here (api.h has to match!). The main instance is
// ESCH256, which has a block size of 128 bits and a digest size of 256 bits.
// Another instance of ESCH is ESCH384.

#define ESCH256

// The identifier SPARKLE_ASSEMBLER determines whether the low-level functions 
// in encrypt.c use the C implementation or an assembler implementation of the
// SPARKLE permutation. Currently, assembler code for SPARKLE exists for the
// AVR and ARM architecture.

#define SPARKLE_ASSEMBLER


///////////////////
#if defined ESCH256
///////////////////

#define ESCH_DIGEST_LEN     256

#define SPARKLE_STATE       384
#define SPARKLE_RATE        128
#define SPARKLE_CAPACITY    256

#define SPARKLE_STEPS_SLIM  7
#define SPARKLE_STEPS_BIG   11


/////////////////////
#elif defined ESCH384
/////////////////////

#define ESCH_DIGEST_LEN     384

#define SPARKLE_STATE       512
#define SPARKLE_RATE        128
#define SPARKLE_CAPACITY    384

#define SPARKLE_STEPS_SLIM  8
#define SPARKLE_STEPS_BIG   12


#else
#error "Invalid definition of ESCH instance."
#endif

#endif  // ESCH_CFG_H