From 60d18d3fe9d1a5db663711063cd0d5c915af377a Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sun, 10 Nov 2013 10:26:47 -0700 Subject: Add crc8 routine Add an implementation of the CRC8 algorithm. This is required by the TPM emulation, but is probably useful to U-Boot in general. Signed-off-by: Simon Glass Signed-off-by: Simon Glass Reviewed-by: Simon Glass --- lib/crc8.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 lib/crc8.c (limited to 'lib/crc8.c') diff --git a/lib/crc8.c b/lib/crc8.c new file mode 100644 index 0000000000..8b68a29e40 --- /dev/null +++ b/lib/crc8.c @@ -0,0 +1,25 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include "linux/crc8.h" + +unsigned int crc8(const unsigned char *vptr, int len) +{ + const unsigned char *data = vptr; + unsigned int crc = 0; + int i, j; + + for (j = len; j; j--, data++) { + crc ^= (*data << 8); + for (i = 8; i; i--) { + if (crc & 0x8000) + crc ^= (0x1070 << 3); + crc <<= 1; + } + } + + return (crc >> 8) & 0xff; +} -- cgit v1.2.1