projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 85d8bf57 MB |
1 | /* |
| 2 | * Copied from Linux kernel crypto/crc32c.c | |
| 3 | * Copyright (c) 2004 Cisco Systems, Inc. | |
| 4 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify it | |
| 7 | * under the terms of the GNU General Public License as published by the Free | |
| 8 | * Software Foundation; either version 2 of the License, or (at your option) | |
| 9 | * any later version. | |
| 10 | * SPDX-License-Identifier: GPL-2.0+ | |
| 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 | } |