sntrup761.c

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/**
 * @file sntrup761.c
 * @brief Streamlined NTRU Prime 761 KEM
 *
 * @section License
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Copyright (C) 2010-2025 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneCRYPTO Open.
 *
 * 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 2
 * 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 2.5.0
 **/
 
//Switch to the appropriate trace level
#define TRACE_LEVEL CRYPTO_TRACE_LEVEL
 
//Dependencies
#include "core/crypto.h"
#include "pqc/sntrup761.h"
 
//Check crypto library configuration
#if (SNTRUP761_SUPPORT == ENABLED)
 
//Dependencies (liboqs)
#include <oqs/oqs.h>
 
//Common interface for key encapsulation mechanisms (KEM)
const KemAlgo sntrup761KemAlgo =
{
   "sntrup761",
   SNTRUP761_PUBLIC_KEY_LEN,
   SNTRUP761_SECRET_KEY_LEN,
   SNTRUP761_CIPHERTEXT_LEN,
   SNTRUP761_SHARED_SECRET_LEN,
   (KemAlgoGenerateKeyPair) sntrup761GenerateKeyPair,
   (KemAlgoEncapsulate) sntrup761Encapsulate,
   (KemAlgoDecapsulate) sntrup761Decapsulate
};
 
 
/**
 * @brief Key pair generation
 * @param[in] prngAlgo PRNG algorithm
 * @param[in] prngContext Pointer to the PRNG context
 * @param[out] pk Public key
 * @param[out] sk Secret key
 * @return Error code
 **/
 
error_t sntrup761GenerateKeyPair(const PrngAlgo *prngAlgo, void *prngContext,
   uint8_t *pk, uint8_t *sk)
{
   OQS_STATUS status;
 
   //Key pair generation
   status = OQS_KEM_ntruprime_sntrup761_keypair(pk, sk);
 
   //Return status code
   return (status == OQS_SUCCESS) ? NO_ERROR : ERROR_FAILURE;
}
 
 
/**
 * @brief Encapsulation algorithm
 * @param[in] prngAlgo PRNG algorithm
 * @param[in] prngContext Pointer to the PRNG context
 * @param[out] ct Ciphertext
 * @param[out] ss Shared secret
 * @param[in] pk Public key
 * @return Error code
 **/
 
error_t sntrup761Encapsulate(const PrngAlgo *prngAlgo, void *prngContext,
   uint8_t *ct, uint8_t *ss, const uint8_t *pk)
{
   OQS_STATUS status;
 
   //Encapsulation algorithm
   status = OQS_KEM_ntruprime_sntrup761_encaps(ct, ss, pk);
 
   //Return status code
   return (status == OQS_SUCCESS) ? NO_ERROR : ERROR_FAILURE;
}
 
 
/**
 * @brief Decapsulation algorithm
 * @param[out] ss Shared secret
 * @param[in] ct Ciphertext
 * @param[in] sk Secret key
 * @return Error code
 **/
 
error_t sntrup761Decapsulate(uint8_t *ss, const uint8_t *ct, const uint8_t *sk)
{
   OQS_STATUS status;
 
   //Decapsulation algorithm
   status = OQS_KEM_ntruprime_sntrup761_decaps(ss, ct, sk);
 
   //Return status code
   return (status == OQS_SUCCESS) ? NO_ERROR : ERROR_FAILURE;
}
 
#endif