| 1 | /* $Id: USBLib.cpp 62490 2016-07-22 18:41:49Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * VirtualBox USB Library, Common Bits.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2016 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 |
|
|---|
| 19 | /*********************************************************************************************************************************
|
|---|
| 20 | * Header Files *
|
|---|
| 21 | *********************************************************************************************************************************/
|
|---|
| 22 | #include <VBox/usblib.h>
|
|---|
| 23 |
|
|---|
| 24 |
|
|---|
| 25 | /**
|
|---|
| 26 | * Calculate the hash of the serial string.
|
|---|
| 27 | *
|
|---|
| 28 | * 64bit FNV1a, chosen because it is designed to hash in to a power of two
|
|---|
| 29 | * space, and is much quicker and simpler than, say, a half MD4.
|
|---|
| 30 | *
|
|---|
| 31 | * @returns the hash.
|
|---|
| 32 | * @param pszSerial The serial string.
|
|---|
| 33 | */
|
|---|
| 34 | USBLIB_DECL(uint64_t) USBLibHashSerial(const char *pszSerial)
|
|---|
| 35 | {
|
|---|
| 36 | if (!pszSerial)
|
|---|
| 37 | pszSerial = "";
|
|---|
| 38 |
|
|---|
| 39 | register const uint8_t *pu8 = (const uint8_t *)pszSerial;
|
|---|
| 40 | register uint64_t u64 = UINT64_C(14695981039346656037);
|
|---|
| 41 | for (;;)
|
|---|
| 42 | {
|
|---|
| 43 | register uint8_t u8 = *pu8;
|
|---|
| 44 | if (!u8)
|
|---|
| 45 | break;
|
|---|
| 46 | u64 = (u64 * UINT64_C(1099511628211)) ^ u8;
|
|---|
| 47 | pu8++;
|
|---|
| 48 | }
|
|---|
| 49 |
|
|---|
| 50 | return u64;
|
|---|
| 51 | }
|
|---|
| 52 |
|
|---|
