falcon.h

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/* 2020-2026 Quantum Resistant Cryptographic Solutions Corporation
 * All Rights Reserved.
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 * This software and all accompanying materials are the exclusive property of
 * Quantum Resistant Cryptographic Solutions Corporation (QRCS). The intellectual
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 * CRYPTOGRAPHIC ALGORITHMS AND IMPLEMENTATIONS:
 * - This software includes implementations of cryptographic primitives and
 *   algorithms that are standardized or in the public domain, such as AES
 *   and SHA-3, which are not proprietary to QRCS.
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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.
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 * Portions of this software may include experimental, novel, or evolving
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 * ARISING FROM THE USE OR MISUSE OF THIS SOFTWARE.
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 * FULL LICENSE:
 * This software is subject to the Quantum Resistant Cryptographic Solutions
 * Public Research and Evaluation License (QRCS-PREL), 2025-2026. The complete license terms
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 * Written by: John G. Underhill
 * Contact: contact@qrcscorp.ca
 */
#ifndef QSC_FALCON_H
#define QSC_FALCON_H

 
#include "qsccommon.h"
 
#if defined(QSC_FALCON_S3SHAKE256F512)

#   define QSC_FALCON_PRIVATEKEY_SIZE 1281

#   define QSC_FALCON_PUBLICKEY_SIZE 897

#   define QSC_FALCON_SIGNATURE_SIZE 658

#   define QSC_FALCON_ALGNAME "FALCON-P512"
 
#elif defined(QSC_FALCON_S5SHAKE256F1024)

#   define QSC_FALCON_PRIVATEKEY_SIZE 2305

#   define QSC_FALCON_PUBLICKEY_SIZE 1793

#   define QSC_FALCON_SIGNATURE_SIZE 1276

#   define QSC_FALCON_ALGNAME "FALCON-P1024"
 
#else
#   error "The Falcon parameter set is invalid!"
#endif

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

QSC_EXPORT_API bool qsc_falcon_sign(uint8_t* signedmsg, size_t* smsglen, const uint8_t* message, size_t msglen, const uint8_t* privatekey, bool (*rng_generate)(uint8_t*, size_t));

QSC_EXPORT_API bool qsc_falcon_verify(uint8_t* message, size_t* msglen, const uint8_t* signedmsg, size_t smsglen, const uint8_t* publickey);
 
#endif