]>
cvs.zerfleddert.de Git - proxmark3-svn/blob - common/iso15693tools.c
add0ba69f8367b4d7ede2b5863014d156d3d5251
1 //-----------------------------------------------------------------------------
2 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
3 // at your option, any later version. See the LICENSE.txt file for the text of
5 //-----------------------------------------------------------------------------
6 // ISO15693 CRC & other commons
7 //-----------------------------------------------------------------------------
10 #include "proxmark3.h"
13 //#include "iso15693tools.h"
15 // The CRC as described in ISO 15693-Part 3-Annex C
18 // returns crc as 16bit value
19 uint16_t Iso15693Crc(uint8_t *v
, int n
)
25 for(i
= 0; i
< n
; i
++) {
26 reg
= reg
^ ((uint32_t)v
[i
]);
27 for (j
= 0; j
< 8; j
++) {
29 reg
= (reg
>> 1) ^ 0x8408;
36 return ~(uint16_t)(reg
& 0xffff);
39 // adds a CRC to a dataframe
40 // req[] iso15963 frame without crc
41 // n length without crc
42 // returns the new length of the dataframe.
43 int Iso15693AddCrc(uint8_t *req
, int n
) {
44 uint16_t crc
=Iso15693Crc(req
,n
);
51 int sprintf(char *str
, const char *format
, ...);
53 // returns a string representation of the UID
54 // UID is transmitted and stored LSB first, displayed MSB first
55 // target char* buffer, where to put the UID, if NULL a static buffer is returned
56 // uid[] the UID in transmission order
57 // return: ptr to string
58 char* Iso15693sprintUID(char *target
,uint8_t *uid
) {
59 static char tempbuf
[2*8+1]="";
60 if (target
==NULL
) target
=tempbuf
;
61 sprintf(target
,"%02X%02X%02X%02X%02X%02X%02X%02X",
62 uid
[7],uid
[6],uid
[5],uid
[4],uid
[3],uid
[2],uid
[1],uid
[0]);