mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-11-24 02:05:01 +00:00
3333e57849
This is the second of several CLs adding a more memory- and code-efficient firmware verification library. BUG=chromium:370082 BRANCH=none TEST=make clean && COV=1 make Change-Id: I1dd571e7511bff18469707d5a2e90068e68e0d6f Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/199841 Reviewed-by: Bill Richardson <wfrichar@chromium.org>
30 lines
660 B
C
30 lines
660 B
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#include "2sysincludes.h"
|
|
#include "2crc8.h"
|
|
|
|
uint8_t vb2_crc8(const void *vptr, uint32_t size)
|
|
{
|
|
const uint8_t *data = vptr;
|
|
unsigned crc = 0;
|
|
uint32_t i, j;
|
|
|
|
/*
|
|
* Calculate CRC-8 directly. A table-based algorithm would be faster,
|
|
* but for only a few bytes it isn't worth the code size.
|
|
*/
|
|
for (j = size; j; j--, data++) {
|
|
crc ^= (*data << 8);
|
|
for(i = 8; i; i--) {
|
|
if (crc & 0x8000)
|
|
crc ^= (0x1070 << 3);
|
|
crc <<= 1;
|
|
}
|
|
}
|
|
|
|
return (uint8_t)(crc >> 8);
|
|
}
|