From: iceman1001 <iceman@iuse.se>
Date: Thu, 12 Mar 2015 19:33:36 +0000 (+0100)
Subject: FIX:  @marshmellow found out that the CRC-8/Maxim was not always giving the right... 
X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/a8cd503dd5b68ab727fc9ed68f11d68bc6d7b41a

FIX:  @marshmellow found out that the CRC-8/Maxim was not always giving the right checksum. Change POLY from 0x31 -> 0x8C
---

diff --git a/common/crc.c b/common/crc.c
index 153ff11c..1bd0cefe 100644
--- a/common/crc.c
+++ b/common/crc.c
@@ -42,14 +42,12 @@ uint32_t crc_finish(crc_t *crc)
 	return ( crc->state ^ crc->final_xor ) & crc->mask;
 }
 
-int CRC8Maxim(uint8_t *buff, size_t size  ) {
+uint32_t CRC8Maxim(uint8_t *buff, size_t size) {
 	
 	crc_t crc;
-	crc_init(&crc, 8, 0x31, 0x00, 0x00);
-	crc_clear(&crc);
-
-	for ( int i=0; i < size; ++i){
+	crc_init(&crc, 9, 0x8c, 0x00, 0x00);
+	for ( uint8_t i = 0; i < size; ++i){
 		crc_update(&crc, buff[i], 8);
 	}
 	return crc_finish(&crc);
-}
+}
\ No newline at end of file
diff --git a/common/crc.h b/common/crc.h
index eb91196b..8c152fa2 100644
--- a/common/crc.h
+++ b/common/crc.h
@@ -38,7 +38,7 @@ extern void crc_clear(crc_t *crc);
 extern uint32_t crc_finish(crc_t *crc);
 
 // Calculate CRC-8/Maxim checksum
-int CRC8Maxim(uint8_t *buff, size_t size  );
+uint32_t CRC8Maxim(uint8_t *buff, size_t size  );
 
 /* Static initialization of a crc structure */
 #define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \