ecdsa.h

Go to the documentation of this file.

/* 2020-2026 Quantum Resistant Cryptographic Solutions Corporation
 * All Rights Reserved.
 *
 * NOTICE:
 * This software and all accompanying materials are the exclusive property of
 * Quantum Resistant Cryptographic Solutions Corporation (QRCS). The intellectual
 * and technical concepts contained herein are proprietary to QRCS and are
 * protected under applicable Canadian, U.S., and international copyright,
 * patent, and trade secret laws.
 *
 * 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.
 * - This software also includes cryptographic primitives, constructions, and
 *   algorithms designed by QRCS, including but not limited to RCS, SCB, CSX, QMAC, and
 *   related components, which are proprietary to QRCS.
 * - All source code, implementations, protocol compositions, optimizations,
 *   parameter selections, and engineering work contained in this software are
 *   original works of QRCS and are protected under this license.
 *
 * LICENSE AND USE RESTRICTIONS:
 * - This software is licensed under the Quantum Resistant Cryptographic Solutions
 *   Public Research and Evaluation License (QRCS-PREL), 2025-2026.
 * - Permission is granted solely for non-commercial evaluation, academic research,
 *   cryptographic analysis, interoperability testing, and feasibility assessment.
 * - Commercial use, production deployment, commercial redistribution, or
 *   integration into products or services is strictly prohibited without a
 *   separate written license agreement executed with QRCS.
 * - Licensing and authorized distribution are solely at the discretion of QRCS.
 *
 * EXPERIMENTAL CRYPTOGRAPHY NOTICE:
 * Portions of this software may include experimental, novel, or evolving
 * cryptographic designs. Use of this software is entirely at the user's risk.
 *
 * DISCLAIMER:
 * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE, SECURITY, OR NON-INFRINGEMENT. QRCS DISCLAIMS ALL
 * LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING FROM THE USE OR MISUSE OF THIS SOFTWARE.
 *
 * 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
 * are provided in the accompanying LICENSE file or at https://www.qrcscorp.ca.
 *
 * Written by: John G. Underhill
 * Contact: contact@qrcscorp.ca
 */
 
#ifndef QSC_ECDSA_H
#define QSC_ECDSA_H
 
#include "qsccommon.h"
 
QSC_CPLUSPLUS_ENABLED_START

 
#if defined(QSC_ECDSA_S1P256)

#   define QSC_ECDSA_SIGNATURE_SIZE 64U

#   define QSC_ECDSA_PRIVATEKEY_SIZE 96U

#   define QSC_ECDSA_PUBLICKEY_SIZE 64U

#   define QSC_ECDSA_SEED_SIZE 32ULL

#   define QSC_ECDSA_ALGNAME "ECDSAP256"

#   define QSC_ECDSA_SEC1_PUBLICKEY_SIZE 65U

#   define QSC_ECDSA_SPKI_DER_SIZE 91U

#   define QSC_ECDSA_SIGNATURE_DER_MAX_SIZE 72U
 
#elif defined(QSC_ECDSA_S3P384)

#   define QSC_ECDSA_SIGNATURE_SIZE 96U

#   define QSC_ECDSA_PRIVATEKEY_SIZE 144U

#   define QSC_ECDSA_PUBLICKEY_SIZE 96U

#   define QSC_ECDSA_SEED_SIZE 48ULL

#   define QSC_ECDSA_ALGNAME "ECDSAP384"

#   define QSC_ECDSA_SEC1_PUBLICKEY_SIZE 97U

#   define QSC_ECDSA_SPKI_DER_SIZE 120U

#   define QSC_ECDSA_SIGNATURE_DER_MAX_SIZE 104U
 
#elif defined(QSC_ECDSA_S5P521)

#   define QSC_ECDSA_SIGNATURE_SIZE 132U

#   define QSC_ECDSA_PRIVATEKEY_SIZE 198U

#   define QSC_ECDSA_PUBLICKEY_SIZE 132U

#   define QSC_ECDSA_SEED_SIZE 66ULL

#   define QSC_ECDSA_ALGNAME "ECDSAP521"

#   define QSC_ECDSA_SEC1_PUBLICKEY_SIZE 133U

#   define QSC_ECDSA_SPKI_DER_SIZE 158U

#   define QSC_ECDSA_SIGNATURE_DER_MAX_SIZE 139U
 
#else
#   error "The ECDSA parameter set is invalid! Define QSC_ECDSA_S1EC256 or QSC_ECDSA_S3P384."
#endif

QSC_EXPORT_API void qsc_ecdsa_publickey_to_sec1(uint8_t* secpub, const uint8_t* publickey);

QSC_EXPORT_API int32_t qsc_ecdsa_publickey_from_privatekey(uint8_t* publickey, const uint8_t* privatekey);

QSC_EXPORT_API bool qsc_ecdsa_publickey_from_sec1(uint8_t* publickey, const uint8_t* secpub);

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

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

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

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

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