mirror of
https://github.com/Proxmark/proxmark3.git
synced 2025-02-24 18:57:27 -08:00
f028213f0e
Not sure what has changed in the Proxmark firmware, but not quite working the same. hf iclass dump, sometimes does not accurately get the CSN and CC used for Authentication. Other times it fails to execute the procedure to dump the card, or a correct MAC is diagnosed as authentication failure. However, if a MAC is corrected calculated, card contents ca be dumped with hf iclass replay <MAC> It could be down to the antenna? as I am Using the RyscCorp HF Antenna. Requires further testing!
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
//-----------------------------------------------------------------------------
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// ISO15693 CRC & other commons
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//-----------------------------------------------------------------------------
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#include "proxmark3.h"
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#include <stdint.h>
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#include <stdlib.h>
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//#include "iso15693tools.h"
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#define POLY 0x8408
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// The CRC as described in ISO 15693-Part 3-Annex C
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// v buffer with data
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// n length
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// returns crc as 16bit value
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uint16_t Iso15693Crc(uint8_t *v, int n)
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{
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uint32_t reg;
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int i, j;
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reg = 0xffff;
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for(i = 0; i < n; i++) {
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reg = reg ^ ((uint32_t)v[i]);
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for (j = 0; j < 8; j++) {
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if (reg & 0x0001) {
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reg = (reg >> 1) ^ 0x8408;
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} else {
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reg = (reg >> 1);
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}
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}
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}
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return ~(uint16_t)(reg & 0xffff);
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}
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// adds a CRC to a dataframe
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// req[] iso15963 frame without crc
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// n length without crc
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// returns the new length of the dataframe.
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int Iso15693AddCrc(uint8_t *req, int n) {
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uint16_t crc=Iso15693Crc(req,n);
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req[n] = crc & 0xff;
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req[n+1] = crc >> 8;
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return n+2;
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}
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int sprintf(char *str, const char *format, ...);
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// returns a string representation of the UID
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// UID is transmitted and stored LSB first, displayed MSB first
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// target char* buffer, where to put the UID, if NULL a static buffer is returned
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// uid[] the UID in transmission order
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// return: ptr to string
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char* Iso15693sprintUID(char *target,uint8_t *uid) {
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static char tempbuf[2*8+1]="";
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if (target==NULL) target=tempbuf;
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sprintf(target,"%02X%02X%02X%02X%02X%02X%02X%02X",
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uid[7],uid[6],uid[5],uid[4],uid[3],uid[2],uid[1],uid[0]);
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return target;
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}
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//CRC-16 Routine used within iclass
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unsigned short iclass_crc16(char *data_p, unsigned short length)
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{
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unsigned char i;
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unsigned int data;
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unsigned int crc = 0xffff;
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if (length == 0)
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return (~crc);
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do
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{
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for (i=0, data=(unsigned int)0xff & *data_p++;
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i < 8;
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i++, data >>= 1)
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{
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if ((crc & 0x0001) ^ (data & 0x0001))
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crc = (crc >> 1) ^ POLY;
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else crc >>= 1;
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}
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} while (--length);
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crc = ~crc;
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data = crc;
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crc = (crc << 8) | (data >> 8 & 0xff);
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crc = crc ^ 0xBC3;
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return (crc);
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}
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