/* $Id: USBLib.cpp $ */
/** @file
 * VirtualBox USB Library, Common Bits.
 */

/*
 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation, in version 3 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses>.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
 * in the VirtualBox distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 *
 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#include <VBox/usblib.h>


/**
 * Calculate the hash of the serial string.
 *
 * 64bit FNV1a, chosen because it is designed to hash in to a power of two
 * space, and is much quicker and simpler than, say, a half MD4.
 *
 * @returns the hash.
 * @param   pszSerial       The serial string.
 */
USBLIB_DECL(uint64_t) USBLibHashSerial(const char *pszSerial)
{
    if (!pszSerial)
        pszSerial = "";

    const uint8_t *pu8 = (const uint8_t *)pszSerial;
    uint64_t u64 = UINT64_C(14695981039346656037);
    for (;;)
    {
        uint8_t u8 = *pu8;
        if (!u8)
            break;
        u64 = (u64 * UINT64_C(1099511628211)) ^ u8;
        pu8++;
    }

    return u64;
}