pqsuser.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
 * 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
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 * - This software is licensed under the Quantum Resistant Cryptographic Solutions
 *   Public Research and Evaluation License (QRCS-PREL), 2025-2026.
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 * EXPERIMENTAL CRYPTOGRAPHY NOTICE:
 * Portions of this software may include experimental, novel, or evolving
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 * 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 PQS_USER_H
#define PQS_USER_H
 
#include "pqs.h"


#define PQS_USER_DATABASE_MAGIC "PQSUSERDB1"

#define PQS_USER_DEFAULT_SHELL_PROFILE "default"

PQS_EXPORT_API typedef struct pqs_user_record
{
    char username[PQS_USERNAME_MAX];                
    char shellprofile[PQS_SHELL_PROFILE_NAME_MAX];  
    uint8_t salt[PQS_USER_SALT_SIZE];               
    uint8_t verifier[PQS_USER_VERIFIER_SIZE];       
    uint64_t created;                                
    uint64_t modified;                              
    uint32_t failures;                              
    pqs_user_privileges privilege;                 
    bool enabled;                                    
} pqs_user_record;

PQS_EXPORT_API typedef struct pqs_user_store
{
    pqs_user_record records[PQS_USER_DATABASE_MAX]; 
    char path[QSC_SYSTEM_MAX_PATH];                 
    size_t count;                                   
    bool initialized;                               
} pqs_user_store;

PQS_EXPORT_API bool pqs_user_store_add(pqs_user_store* store, const char* username, const char* passphrase, pqs_user_privileges privilege);

PQS_EXPORT_API bool pqs_user_store_enable(pqs_user_store* store, const char* username, bool enabled);

PQS_EXPORT_API const pqs_user_record* pqs_user_store_find(const pqs_user_store* store, const char* username);

PQS_EXPORT_API pqs_user_record* pqs_user_store_find_mutable(pqs_user_store* store, const char* username);

PQS_EXPORT_API bool pqs_user_store_initialize(pqs_user_store* store, const char* path);

PQS_EXPORT_API bool pqs_user_store_remove(pqs_user_store* store, const char* username);

PQS_EXPORT_API bool pqs_user_store_save(const pqs_user_store* store);

PQS_EXPORT_API bool pqs_user_store_set_privilege(pqs_user_store* store, const char* username, pqs_user_privileges privilege);

PQS_EXPORT_API bool pqs_user_store_set_shell_profile(pqs_user_store* store, const char* username, const char* shellprofile);

PQS_EXPORT_API bool pqs_user_store_set_passphrase(pqs_user_store* store, const char* username, const char* passphrase);

PQS_EXPORT_API bool pqs_user_name_is_valid(const char* username);

PQS_EXPORT_API bool pqs_user_passphrase_is_valid(const char* passphrase);

PQS_EXPORT_API const char* pqs_user_privilege_to_string(pqs_user_privileges privilege);

PQS_EXPORT_API pqs_user_privileges pqs_user_privilege_from_string(const char* value);

PQS_EXPORT_API bool pqs_user_verify_passphrase(const pqs_user_record* record, const char* passphrase);

PQS_EXPORT_API bool pqs_user_verify_passphrase_timing_neutral(const pqs_user_record* record, const char* username, const char* passphrase);
 
#endif