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Issue 20 patch (refactored code of the iso15693 implementation as well as several enhancements) [Adrian Dabrowski "atrox"]

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adam@algroup.co.uk 2010-10-19 14:25:17 +00:00
parent 6c1e2d95f4
commit 9455b51c2a
14 changed files with 1902 additions and 656 deletions
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common/iso15693tools.c Normal file
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//-----------------------------------------------------------------------------
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// ISO15693 CRC & other commons
//-----------------------------------------------------------------------------
#include "proxmark3.h"
#include <stdint.h>
#include <stdlib.h>
//#include "iso15693tools.h"
// The CRC as described in ISO 15693-Part 3-Annex C
// v buffer with data
// n length
// returns crc as 16bit value
uint16_t Iso15693Crc(uint8_t *v, int n)
{
uint32_t reg;
int i, j;
reg = 0xffff;
for(i = 0; i < n; i++) {
reg = reg ^ ((uint32_t)v[i]);
for (j = 0; j < 8; j++) {
if (reg & 0x0001) {
reg = (reg >> 1) ^ 0x8408;
} else {
reg = (reg >> 1);
}
}
}
return ~(uint16_t)(reg & 0xffff);
}
// adds a CRC to a dataframe
// req[] iso15963 frame without crc
// n length without crc
// returns the new length of the dataframe.
int Iso15693AddCrc(uint8_t *req, int n) {
uint16_t crc=Iso15693Crc(req,n);
req[n] = crc & 0xff;
req[n+1] = crc >> 8;
return n+2;
}
int sprintf(char *str, const char *format, ...);
// returns a string representation of the UID
// UID is transmitted and stored LSB first, displayed MSB first
// target char* buffer, where to put the UID, if NULL a static buffer is returned
// uid[] the UID in transmission order
// return: ptr to string
char* Iso15693sprintUID(char *target,uint8_t *uid) {
static char tempbuf[9]="";
if (target==NULL) target=tempbuf;
sprintf(target,"%02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX",
uid[7],uid[6],uid[5],uid[4],uid[3],uid[2],uid[1],uid[0]);
return target;
}