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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.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "2sysincludes.h"
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#include "2crc8.h"
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uint8_t vb2_crc8(const void *vptr, uint32_t size)
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{
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const uint8_t *data = vptr;
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unsigned crc = 0;
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uint32_t i, j;
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/*
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* Calculate CRC-8 directly. A table-based algorithm would be faster,
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* but for only a few bytes it isn't worth the code size.
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*/
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for (j = size; j; j--, data++) {
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crc ^= (*data << 8);
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for(i = 8; i; i--) {
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if (crc & 0x8000)
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crc ^= (0x1070 << 3);
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crc <<= 1;
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}
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}
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return (uint8_t)(crc >> 8);
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}
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