1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2013 Google, Inc
4  */
5 
6 #ifdef USE_HOSTCC
7 #include <arpa/inet.h>
8 #else
9 #include <common.h>
10 #endif
11 #include <u-boot/crc.h>
12 
13 #define POLY	(0x1070U << 3)
14 
_crc8(unsigned short data)15 static unsigned char _crc8(unsigned short data)
16 {
17 	int i;
18 
19 	for (i = 0; i < 8; i++) {
20 		if (data & 0x8000)
21 			data = data ^ POLY;
22 		data = data << 1;
23 	}
24 
25 	return (unsigned char)(data >> 8);
26 }
27 
crc8(unsigned int crc,const unsigned char * vptr,int len)28 unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
29 {
30 	int i;
31 
32 	for (i = 0; i < len; i++)
33 		crc = _crc8((crc ^ vptr[i]) << 8);
34 
35 	return crc;
36 }
37