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cvs.zerfleddert.de Git - proxmark3-svn/blob - common/iso15693tools.c
0f7a250bf94c54651ec048474c3ced3d2b56c0f9
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"
18 // The CRC as described in ISO 15693-Part 3-Annex C
21 // returns crc as 16bit value
22 uint16_t Iso15693Crc(uint8_t *v
, int n
)
28 for(i
= 0; i
< n
; i
++) {
29 reg
= reg
^ ((uint32_t)v
[i
]);
30 for (j
= 0; j
< 8; j
++) {
32 reg
= (reg
>> 1) ^ 0x8408;
39 return ~(uint16_t)(reg
& 0xffff);
42 // adds a CRC to a dataframe
43 // req[] iso15963 frame without crc
44 // n length without crc
45 // returns the new length of the dataframe.
46 int Iso15693AddCrc(uint8_t *req
, int n
) {
47 uint16_t crc
=Iso15693Crc(req
,n
);
54 int sprintf(char *str
, const char *format
, ...);
56 // returns a string representation of the UID
57 // UID is transmitted and stored LSB first, displayed MSB first
58 // target char* buffer, where to put the UID, if NULL a static buffer is returned
59 // uid[] the UID in transmission order
60 // return: ptr to string
61 char* Iso15693sprintUID(char *target
,uint8_t *uid
) {
62 static char tempbuf
[2*8+1]="";
63 if (target
==NULL
) target
=tempbuf
;
64 sprintf(target
,"%02X%02X%02X%02X%02X%02X%02X%02X",
65 uid
[7],uid
[6],uid
[5],uid
[4],uid
[3],uid
[2],uid
[1],uid
[0]);
69 unsigned short iclass_crc16(char *data_p
, unsigned short length
)
73 unsigned int crc
= 0xffff;
80 for (i
=0, data
=(unsigned int)0xff & *data_p
++;
84 if ((crc
& 0x0001) ^ (data
& 0x0001))
85 crc
= (crc
>> 1) ^ POLY
;
92 crc
= (crc
<< 8) | (data
>> 8 & 0xff);