eddh.h

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/* 2020-2026 Quantum Resistant Cryptographic Solutions Corporation
 * All Rights Reserved.
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 * CRYPTOGRAPHIC ALGORITHMS AND IMPLEMENTATIONS:
 * - This software includes implementations of cryptographic primitives and
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 *   algorithms designed by QRCS, including but not limited to RCS, SCB, CSX, QMAC, and
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 * Public Research and Evaluation License (QRCS-PREL), 2025-2026. The complete license terms
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 * Written by: John G. Underhill
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 */
 
#ifndef QSC_EDDH_H
#define QSC_EDDH_H
 
#include "qsccommon.h"
 
QSC_CPLUSPLUS_ENABLED_START

 
#if defined(QSC_EDDH_S1EC25519)

#   define QSC_EDDH_PUBLICKEY_SIZE 32U

#   define QSC_EDDH_PRIVATEKEY_SIZE 32U

#   define QSC_EDDH_SHAREDSECRET_SIZE 32U

#   define QSC_EDDH_SEED_SIZE 32U

#   define QSC_EDDH_ALGNAME "EDDH-P25519"
 
#elif defined(QSC_EDDH_S3EC448)

#   define QSC_EDDH_PUBLICKEY_SIZE 56U

#   define QSC_EDDH_PRIVATEKEY_SIZE 56U

#   define QSC_EDDH_SHAREDSECRET_SIZE 56U

#   define QSC_EDDH_SEED_SIZE 56U

#   define QSC_EDDH_ALGNAME "EDDH-P448"
 
#else
#   error "No EDDH parameter set defined. Define QSC_EDDH_S1EC25519 or QSC_EDDH_S3EC448."
#endif

QSC_EXPORT_API void qsc_eddh_public_from_private(uint8_t* publickey, const uint8_t* privatekey);

QSC_EXPORT_API bool qsc_eddh_generate_keypair(uint8_t* publickey, uint8_t* privatekey, bool (*rng_generate)(uint8_t*, size_t));

QSC_EXPORT_API bool qsc_eddh_generate_seeded_keypair(uint8_t* publickey, uint8_t* privatekey, const uint8_t* seed);

QSC_EXPORT_API bool qsc_eddh_key_exchange(uint8_t* secret, const uint8_t* privatekey, const uint8_t* publickey);
 
QSC_CPLUSPLUS_ENABLED_END
 
#endif