]>
git.zerfleddert.de Git - proxmark3-svn/blob - common/iso15693tools.c
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"
24 // The CRC as described in ISO 15693-Part 3-Annex C
27 // returns crc as 16bit value
28 uint16_t Iso15693Crc(uint8_t *v
, int n
)
34 for(i
= 0; i
< n
; i
++) {
35 reg
= reg
^ ((uint32_t)v
[i
]);
36 for (j
= 0; j
< 8; j
++) {
38 reg
= (reg
>> 1) ^ 0x8408;
45 return ~(uint16_t)(reg
& 0xffff);
48 // adds a CRC to a dataframe
49 // req[] iso15963 frame without crc
50 // n length without crc
51 // returns the new length of the dataframe.
52 int Iso15693AddCrc(uint8_t *req
, int n
) {
53 uint16_t crc
=Iso15693Crc(req
,n
);
60 // returns a string representation of the UID
61 // UID is transmitted and stored LSB first, displayed MSB first
62 // target char* buffer, where to put the UID, if NULL a static buffer is returned
63 // uid[] the UID in transmission order
64 // return: ptr to string
65 char* Iso15693sprintUID(char *target
,uint8_t *uid
) {
66 static char tempbuf
[2*8+1]="";
67 if (target
==NULL
) target
=tempbuf
;
68 sprintf(target
,"%02X%02X%02X%02X%02X%02X%02X%02X",
69 uid
[7],uid
[6],uid
[5],uid
[4],uid
[3],uid
[2],uid
[1],uid
[0]);
73 uint16_t iclass_crc16(char *data_p
, unsigned short length
)
77 uint16_t crc
= 0xffff;
84 for (i
=0, data
=(unsigned int)0xff & *data_p
++;
88 if ((crc
& 0x0001) ^ (data
& 0x0001))
89 crc
= (crc
>> 1) ^ POLY
;
96 crc
= (crc
<< 8) | (data
>> 8 & 0xff);