1*92193ef7SMarek Behún /*
2*92193ef7SMarek Behún * Copied from Linux kernel crypto/crc32c.c
3*92193ef7SMarek Behún * Copyright (c) 2004 Cisco Systems, Inc.
4*92193ef7SMarek Behún * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
5*92193ef7SMarek Behún *
6*92193ef7SMarek Behún * This program is free software; you can redistribute it and/or modify it
7*92193ef7SMarek Behún * under the terms of the GNU General Public License as published by the Free
8*92193ef7SMarek Behún * Software Foundation; either version 2 of the License, or (at your option)
9*92193ef7SMarek Behún * any later version.
10*92193ef7SMarek Behún * SPDX-License-Identifier: GPL-2.0+
11*92193ef7SMarek Behún */
12*92193ef7SMarek Behún
13*92193ef7SMarek Behún #include <common.h>
14*92193ef7SMarek Behún #include <compiler.h>
15*92193ef7SMarek Behún
crc32c_cal(uint32_t crc,const char * data,int length,uint32_t * crc32c_table)16*92193ef7SMarek Behún uint32_t crc32c_cal(uint32_t crc, const char *data, int length,
17*92193ef7SMarek Behún uint32_t *crc32c_table)
18*92193ef7SMarek Behún {
19*92193ef7SMarek Behún while (length--)
20*92193ef7SMarek Behún crc = crc32c_table[(u8)(crc ^ *data++)] ^ (crc >> 8);
21*92193ef7SMarek Behún
22*92193ef7SMarek Behún return crc;
23*92193ef7SMarek Behún }
24*92193ef7SMarek Behún
crc32c_init(uint32_t * crc32c_table,uint32_t pol)25*92193ef7SMarek Behún void crc32c_init(uint32_t *crc32c_table, uint32_t pol)
26*92193ef7SMarek Behún {
27*92193ef7SMarek Behún int i, j;
28*92193ef7SMarek Behún uint32_t v;
29*92193ef7SMarek Behún const uint32_t poly = pol; /* Bit-reflected CRC32C polynomial */
30*92193ef7SMarek Behún
31*92193ef7SMarek Behún for (i = 0; i < 256; i++) {
32*92193ef7SMarek Behún v = i;
33*92193ef7SMarek Behún for (j = 0; j < 8; j++)
34*92193ef7SMarek Behún v = (v >> 1) ^ ((v & 1) ? poly : 0);
35*92193ef7SMarek Behún
36*92193ef7SMarek Behún crc32c_table[i] = v;
37*92193ef7SMarek Behún }
38*92193ef7SMarek Behún }
39