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feac077c1d
BUG=chrome-os-partner:9707 TEST=manual make make runtests You can also test it by clearing the TPM, then manually looking at the TPM regions. In dev-mode, clear the regions and you'll see something like this: localhost ~ # tpmc read 1007 a 1 0 0 0 0 0 0 0 0 0 localhost ~ # tpmc read 1008 d 1 4c 57 52 47 0 0 0 0 0 0 0 0 localhost ~ # Go back to normal mode and reboot, and you'll see something like this: localhost ~ # tpmc read 1007 a 2 0 1 0 1 0 0 0 0 4f localhost ~ # tpmc read 1008 d 2 4c 57 52 47 1 0 1 0 0 0 0 55 localhost ~ # The important things are that the first number is now 2, instead of 1, and the last number is not zero (it's a checksum, so it'll vary depending on the other numbers, which will themselves vary according to the firmware and kernel versions). Change-Id: Ia4040311c2a4b2819792549b883377c8b6b89d48 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/22856 Reviewed-by: Randall Spangler <rspangler@chromium.org>
29 lines
672 B
C
29 lines
672 B
C
/* Copyright (c) 2011 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 "crc8.h"
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/* Return CRC-8 of the data, using x^8 + x^2 + x + 1 polynomial. A
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* table-based algorithm would be faster, but for only a few bytes it isn't
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* worth the code size. */
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uint8_t Crc8(const void* vptr, int len) {
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const uint8_t *data = vptr;
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unsigned crc = 0;
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int i, j;
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for (j = len; 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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