X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f4a57e861d88657e58ef01cb96ce732d588ca91f..0f6e6b9acbdfe9dd144bc04325ba4c8186da23e5:/common/crc.h

diff --git a/common/crc.h b/common/crc.h
index 8e68f3b3..5a9bcfa7 100644
--- a/common/crc.h
+++ b/common/crc.h
@@ -9,7 +9,10 @@
 #ifndef __CRC_H
 #define __CRC_H
 
-#include <stdint.h>
+#include <stdint.h>		//uint32+
+#include <stdbool.h>	//bool
+#include <stddef.h>
+#include "util.h"	// reflect, bswap_16
 
 typedef struct crc {
 	uint32_t state;
@@ -18,14 +21,26 @@ typedef struct crc {
 	uint32_t initial_value;
 	uint32_t final_xor;
 	uint32_t mask;
+	int topbit;
+	bool refin;    /* Parameter: Reflect input bytes?        */
+	bool refout;   /* Parameter: Reflect output CRC?         */
 } crc_t;
 
+/* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32
+ * polynom is the CRC polynom. initial_value is the initial value of a clean state.
+ * final_xor is XORed onto the state before returning it from crc_result(). 
+ * refin is the setting for reversing (bitwise) the bytes during crc
+ * refot is the setting for reversing (bitwise) the crc byte before returning it.
+ */
+extern void crc_init_ref(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor, bool refin, bool refout);
+	
 /* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32
  * polynom is the CRC polynom. initial_value is the initial value of a clean state.
  * final_xor is XORed onto the state before returning it from crc_result(). */
 extern void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor);
 
-/* Update the crc state. data is the data of length data_width bits (only the the
+
+/* Update the crc state. data is the data of length data_width bits (only the
  * data_width lower-most bits are used).
  */
 extern void crc_update(crc_t *crc, uint32_t data, int data_width);
@@ -36,6 +51,24 @@ extern void crc_clear(crc_t *crc);
 /* Get the result of the crc calculation */
 extern uint32_t crc_finish(crc_t *crc);
 
+// Calculate CRC-8/Maxim checksum
+uint32_t CRC8Maxim(uint8_t *buff, size_t size);
+
+// Calculate CRC-4/Legic checksum
+uint32_t CRC4Legic(uint8_t *buff, size_t size);
+
+// Calculate CRC-8/Legic checksum
+uint32_t CRC8Legic(uint8_t *buff, size_t size);
+
+// Calculate CRC-16/Legic checksum
+// the initial_value is based on the previous legic_Crc8 of the UID.
+// ie:  uidcrc = 0x78  then initial_value == 0x7878
+uint32_t CRC16Legic(uint8_t *buff, size_t size, uint8_t uidcrc);
+
+// test crc 16.
+uint32_t CRC16_DNP(uint8_t *buff, size_t size);
+uint32_t CRC16_CCITT(uint8_t *buff, size_t size);
+
 /* Static initialization of a crc structure */
 #define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \
 	.state = ((_initial_value) & ((1L<<(_order))-1)), \
@@ -43,6 +76,9 @@ extern uint32_t crc_finish(crc_t *crc);
 	.polynom = (_polynom), \
 	.initial_value = (_initial_value), \
 	.final_xor = (_final_xor), \
-	.mask = ((1L<<(_order))-1) }
+	.mask = ((1L<<(_order))-1) \
+	.refin = FALSE, \
+	.refout = FALSE \
+	}
 
 #endif /* __CRC_H */