lib: add calculate crc byte by byte
Change-Id: I5cab1f90452b08a464ad7a2d7e75d97187452992 Signed-off-by: Xiang Wang <merle@hardenedlinux.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/36624 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2019 HardenedLinux
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef CRC_BYTE_H
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#define CRC_BYTE_H
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#include <stdint.h>
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/* This function is used to calculate crc7 byte by byte, with polynomial
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* x^7 + x^3 + 1.
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*
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* prev_crc: old crc result (0 for first)
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* data: new byte
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* return value: new crc result
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*/
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uint8_t crc7_byte(uint8_t prev_crc, uint8_t data);
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/* This function is used to calculate crc16 byte by byte, with polynomial
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* x^16 + x^12 + x^5 + 1.
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*
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* prev_crc: old crc result (0 for first)
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* data: new byte
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* return value: new crc result
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*/
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uint16_t crc16_byte(uint16_t prev_crc, uint8_t data);
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#endif /* CRC_BYTE_H */
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@ -249,6 +249,14 @@ postcar-y += string.c
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ramstage-y += string.c
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smm-y += string.c
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decompressor-y += crc_byte.c
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bootblock-y += crc_byte.c
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verstage-y += crc_byte.c
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romstage-y += crc_byte.c
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postcar-y += crc_byte.c
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ramstage-y += crc_byte.c
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smm-y += crc_byte.c
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postcar-y += bootmode.c
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postcar-y += boot_device.c
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postcar-y += cbfs.c
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@ -0,0 +1,38 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2019 HardenedLinux
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <crc_byte.h>
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uint8_t crc7_byte(uint8_t prev_crc, uint8_t data)
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{
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const uint8_t g = 0x89;
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prev_crc ^= data;
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for (int i = 0; i < 8; i++) {
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if (prev_crc & 0x80)
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prev_crc ^= g;
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prev_crc <<= 1;
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}
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return prev_crc;
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}
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uint16_t crc16_byte(uint16_t prev_crc, uint8_t data)
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{
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prev_crc = (uint8_t)(prev_crc >> 8)|(prev_crc << 8);
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prev_crc ^= data;
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prev_crc ^= (uint8_t)(prev_crc & 0xff) >> 4;
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prev_crc ^= (prev_crc << 8) << 4;
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prev_crc ^= ((prev_crc & 0xff) << 4) << 1;
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return prev_crc;
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}
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