1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copied from Linux kernel crypto/crc32c.c 4 * Copyright (c) 2004 Cisco Systems, Inc. 5 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 */ 12 13 #include <common.h> 14 #include <compiler.h> 15 16 uint32_t crc32c_cal(uint32_t crc, const char *data, int length, 17 uint32_t *crc32c_table) 18 { 19 while (length--) 20 crc = crc32c_table[(u8)(crc ^ *data++)] ^ (crc >> 8); 21 22 return crc; 23 } 24 25 void crc32c_init(uint32_t *crc32c_table, uint32_t pol) 26 { 27 int i, j; 28 uint32_t v; 29 const uint32_t poly = pol; /* Bit-reflected CRC32C polynomial */ 30 31 for (i = 0; i < 256; i++) { 32 v = i; 33 for (j = 0; j < 8; j++) 34 v = (v >> 1) ^ ((v & 1) ? poly : 0); 35 36 crc32c_table[i] = v; 37 } 38 } 39