pqskey.h

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/* 2025-2026 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
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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.
 * - 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.
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 *   Public Research and Evaluation License (QRCS-PREL), 2025-2026.
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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 PQS_KEY_H
#define PQS_KEY_H
 
#include "pqscommon.h"
#include "qsms.h"


#define PQS_KEY_FINGERPRINT_SIZE 32U

#define PQS_KEY_FINGERPRINT_STRING_SIZE ((PQS_KEY_FINGERPRINT_SIZE * 2U) + PQS_STRING_TERMINATOR_SIZE)

#define PQS_KEY_KNOWN_HOST_LINE_MAX 384U

#define PQS_KEY_HOST_NAME_MAX 256U

#define PQS_KEY_KNOWN_HOST_MAGIC "# PQSKNOWNHOSTS1"

PQS_EXPORT_API bool pqs_key_host_is_valid(const char* host);

PQS_EXPORT_API bool pqs_key_private_file_permissions_are_strict(const char* fpath);

PQS_EXPORT_API void pqs_key_fingerprint(uint8_t output[PQS_KEY_FINGERPRINT_SIZE], const qsms_client_verification_key* pubkey);

PQS_EXPORT_API bool pqs_key_fingerprint_string(char* output, size_t outlen, const qsms_client_verification_key* pubkey);

PQS_EXPORT_API bool pqs_key_fingerprint_file(char* output, size_t outlen, const char* fpath);

PQS_EXPORT_API bool pqs_key_known_host_find(const char* fpath, const char* host, char* fingerprint, size_t fplen);

PQS_EXPORT_API bool pqs_key_known_host_set(const char* fpath, const char* host, const char* fingerprint);

PQS_EXPORT_API bool pqs_key_known_host_remove(const char* fpath, const char* host);

PQS_EXPORT_API bool pqs_key_fingerprint_is_valid(const char* fingerprint);

PQS_EXPORT_API bool pqs_key_known_host_verify(const char* fpath, const char* host, const char* fingerprint);
 
#endif