// SPDX-License-Identifier: GPL-2.0+

  /*
   * Copyright (c) 2013 Google, Inc

   */

  #ifdef USE_HOSTCC
  #include <arpa/inet.h>
  #else
  #include <common.h>
  #endif
  #include <u-boot/crc.h>

  #define POLY	(0x1070U << 3)
  
  static unsigned char _crc8(unsigned short data)

  {

  	int i;
  
  	for (i = 0; i < 8; i++) {
  		if (data & 0x8000)
  			data = data ^ POLY;
  		data = data << 1;

  	}

  	return (unsigned char)(data >> 8);
  }
  
  unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
  {
  	int i;
  
  	for (i = 0; i < len; i++)
  		crc = _crc8((crc ^ vptr[i]) << 8);
  
  	return crc;

  }