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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
4 // the license.
5 //-----------------------------------------------------------------------------
6 // ISO15693 CRC & other commons
7 //-----------------------------------------------------------------------------
8
9
10 #include "proxmark3.h"
11 #include <stdint.h>
12 #include <stdlib.h>
13 //#include "iso15693tools.h"
14
15 // The CRC as described in ISO 15693-Part 3-Annex C
16 // v buffer with data
17 // n length
18 // returns crc as 16bit value
19 uint16_t Iso15693Crc(uint8_t *v, int n)
20 {
21 uint32_t reg;
22 int i, j;
23
24 reg = 0xffff;
25 for(i = 0; i < n; i++) {
26 reg = reg ^ ((uint32_t)v[i]);
27 for (j = 0; j < 8; j++) {
28 if (reg & 0x0001) {
29 reg = (reg >> 1) ^ 0x8408;
30 } else {
31 reg = (reg >> 1);
32 }
33 }
34 }
35
36 return ~(uint16_t)(reg & 0xffff);
37 }
38
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);
45 req[n] = crc & 0xff;
46 req[n+1] = crc >> 8;
47 return n+2;
48 }
49
50
51 int sprintf(char *str, const char *format, ...);
52
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]);
63 return target;
64 }
65
66
67
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