lib/crc8.c

   1 /*
   2  * Copyright (c) 2013 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include "linux/crc8.h"
   8
   9 unsigned int crc8(const unsigned char *vptr, int len)
  10 {
  11         const unsigned char *data = vptr;
  12         unsigned int crc = 0;
  13         int i, j;
  14
  15         for (j = len; j; j--, data++) {
  16                 crc ^= (*data << 8);
  17                 for (i = 8; i; i--) {
  18                         if (crc & 0x8000)
  19                                 crc ^= (0x1070 << 3);
  20                         crc <<= 1;
  21                 }
  22         }
  23
  24         return (crc >> 8) & 0xff;
  25 }