| 1 | /* $Id: USBLib.cpp 56293 2015-06-09 14:23:56Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox USB Library, Common Bits.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2015 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*******************************************************************************
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| 20 | * Header Files *
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| 21 | *******************************************************************************/
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| 22 | #include <VBox/usblib.h>
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| 23 |
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| 24 |
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| 25 | /**
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| 26 | * Calculate the hash of the serial string.
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| 27 | *
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| 28 | * 64bit FNV1a, chosen because it is designed to hash in to a power of two
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| 29 | * space, and is much quicker and simpler than, say, a half MD4.
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| 30 | *
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| 31 | * @returns the hash.
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| 32 | * @param pszSerial The serial string.
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| 33 | */
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| 34 | USBLIB_DECL(uint64_t) USBLibHashSerial(const char *pszSerial)
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| 35 | {
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| 36 | if (!pszSerial)
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| 37 | pszSerial = "";
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| 38 |
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| 39 | register const uint8_t *pu8 = (const uint8_t *)pszSerial;
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| 40 | register uint64_t u64 = UINT64_C(14695981039346656037);
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| 41 | for (;;)
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| 42 | {
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| 43 | register uint8_t u8 = *pu8;
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| 44 | if (!u8)
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| 45 | break;
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| 46 | u64 = (u64 * UINT64_C(1099511628211)) ^ u8;
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| 47 | pu8++;
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| 48 | }
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| 49 |
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| 50 | return u64;
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| 51 | }
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| 52 |
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