crc32c.c 960 B

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  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. #include <common.h>
  13. #include <compiler.h>
  14. uint32_t crc32c_cal(uint32_t crc, const char *data, int length,
  15. uint32_t *crc32c_table)
  16. {
  17. while (length--)
  18. crc = crc32c_table[(u8)(crc ^ *data++)] ^ (crc >> 8);
  19. return crc;
  20. }
  21. void crc32c_init(uint32_t *crc32c_table, uint32_t pol)
  22. {
  23. int i, j;
  24. uint32_t v;
  25. const uint32_t poly = pol; /* Bit-reflected CRC32C polynomial */
  26. for (i = 0; i < 256; i++) {
  27. v = i;
  28. for (j = 0; j < 8; j++)
  29. v = (v >> 1) ^ ((v & 1) ? poly : 0);
  30. crc32c_table[i] = v;
  31. }
  32. }