X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a39944216dd5d765e16917c1092bacc6061b518f..4ac9f07840b0a931cb1d1c7a1dc36510256c7f9f:/common/crc.c

diff --git a/common/crc.c b/common/crc.c
index 540ae668..f9a15234 100644
--- a/common/crc.c
+++ b/common/crc.c
@@ -35,32 +35,24 @@ void crc_clear(crc_t *crc) {
 		crc->state = reflect(crc->state, crc->order);
 }
 
-void crc_update(crc_t *crc, uint32_t indata, int data_width){
-
-	uint32_t poly = crc->polynom;	
-
-	// if requested, return the initial CRC */
-    if (indata == 0)
-        return crc->initial_value;
-		
-	//reflected
+void crc_update2(crc_t *crc, uint32_t data, int data_width){
+	
 	if (crc->refin) 
-		indata = reflect(indata, data_width);
+		data = reflect(data, data_width);
 	
 	// Bring the next byte into the remainder.
-	crc->state ^= indata << (crc->order - data_width);
+	crc->state ^= data << (crc->order - data_width);
 	
 	for( uint8_t bit = data_width; bit > 0; --bit) {		
-		 // Try to divide the current data bit.
+
 		if (crc->state & crc->topbit)
-			crc->state = (crc->state << 1) ^ poly;
+			crc->state = (crc->state << 1) ^ crc->polynom;
 		else
 			crc->state = (crc->state << 1);
 	}
-    return crc ^ model->xorout;
 }
 
-void crc_update2(crc_t *crc, uint32_t data, int data_width)
+void crc_update(crc_t *crc, uint32_t data, int data_width)
 {
 	if (crc->refin) 
 		data = reflect(data, data_width);
@@ -76,7 +68,6 @@ void crc_update2(crc_t *crc, uint32_t data, int data_width)
 	}
 }
 
-
 uint32_t crc_finish(crc_t *crc) {
 	uint32_t val = crc->state;
 	if (crc->refout) val = reflect(val, crc->order);
@@ -104,7 +95,7 @@ uint32_t CRC8Maxim(uint8_t *buff, size_t size) {
 	crc_t crc;
 	crc_init_ref(&crc, 8, 0x31, 0, 0, TRUE, TRUE);	
 	for ( int i=0; i < size; ++i)
-		crc_update(&crc, buff[i], 8);
+		crc_update2(&crc, buff[i], 8);
 	return crc_finish(&crc);
 }
 
@@ -123,7 +114,7 @@ uint32_t CRC8Legic(uint8_t *buff, size_t size) {
 	crc_t crc;
 	crc_init_ref(&crc, 8, 0x63, 0x55, 0, TRUE, TRUE);
 	for ( int i = 0; i < size; ++i)
-		crc_update(&crc, buff[i], 8);
+		crc_update2(&crc, buff[i], 8);
 	return reflect(crc_finish(&crc), 8);
 }
 
@@ -147,7 +138,7 @@ uint32_t CRC16_DNP(uint8_t *buff, size_t size) {
 	crc_t crc;
 	crc_init_ref(&crc, 16, 0x3d65, 0, 0xffff, TRUE, TRUE);
 	for ( int i=0; i < size; ++i)
-		crc_update(&crc, buff[i], 8);
+		crc_update2(&crc, buff[i], 8);
 	
 	return BSWAP_16(crc_finish(&crc));
 }