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39 lines
960 B
C
39 lines
960 B
C
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/*
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* Copied from Linux kernel crypto/crc32c.c
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* Copyright (c) 2004 Cisco Systems, Inc.
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* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <compiler.h>
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uint32_t crc32c_cal(uint32_t crc, const char *data, int length,
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uint32_t *crc32c_table)
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{
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while (length--)
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crc = crc32c_table[(u8)(crc ^ *data++)] ^ (crc >> 8);
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return crc;
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}
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void crc32c_init(uint32_t *crc32c_table, uint32_t pol)
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{
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int i, j;
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uint32_t v;
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const uint32_t poly = pol; /* Bit-reflected CRC32C polynomial */
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for (i = 0; i < 256; i++) {
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v = i;
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for (j = 0; j < 8; j++)
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v = (v >> 1) ^ ((v & 1) ? poly : 0);
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crc32c_table[i] = v;
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}
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}
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