1. Mifare read block command

[proxmark3-svn] / armsrc / mifareutil.c

//-----------------------------------------------------------------------------\r
// Merlok, May 2011\r
// Many authors, that makes it possible\r
//\r
// This code is licensed to you under the terms of the GNU GPL, version 2 or,\r
// at your option, any later version. See the LICENSE.txt file for the text of\r
// the license.\r
//-----------------------------------------------------------------------------\r
// code for work with mifare cards.\r
//-----------------------------------------------------------------------------\r
\r
#include "proxmark3.h"\r
#include "apps.h"\r
#include "util.h"\r
#include "string.h"\r
\r
#include "iso14443crc.h"\r
#include "iso14443a.h"\r
#include "crapto1.h"\r
#include "mifareutil.h"\r
\r
uint8_t* mifare_get_bigbufptr(void) {\r
	return (((uint8_t *)BigBuf) + 3560);	// was 3560 - tied to other size changes\r
}\r
\r
int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer)\r
{\r
	uint8_t dcmd[4], ecmd[4];\r
	uint32_t pos, par, res;\r
\r
	dcmd[0] = cmd;\r
	dcmd[1] = data;\r
	AppendCrc14443a(dcmd, 2);\r
	\r
	memcpy(ecmd, dcmd, sizeof(dcmd));\r
	\r
	if (crypted) {\r
		par = 0;\r
		for (pos = 0; pos < 4; pos++)\r
		{\r
			ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];\r
			par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );\r
		}	\r
\r
		ReaderTransmitPar(ecmd, sizeof(ecmd), par);\r
\r
	} else {\r
		ReaderTransmit(dcmd, sizeof(dcmd));\r
	}\r
\r
	int len = ReaderReceive(answer);\r
\r
	if (crypted) {\r
		if (len == 1) {\r
			res = 0;\r
			for (pos = 0; pos < 4; pos++)\r
				res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;\r
				\r
			answer[0] = res;\r
			\r
		} else {\r
			for (pos = 0; pos < len; pos++)\r
			{\r
				answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];\r
			}\r
		}\r
	}\r
	\r
	return len;\r
}\r
\r
int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested) \r
{\r
	// variables\r
  int len;	\r
	uint32_t pos;\r
	uint8_t tmp4[4];\r
  byte_t par = 0;\r
  byte_t ar[4];\r
	uint32_t nt, ntpp; // Supplied tag nonce\r
	\r
	uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };\r
  uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
\r
  // Transmit MIFARE_CLASSIC_AUTH\r
	len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer);\r
//	Dbprintf("rand nonce len: %x", len);  \r
  if (len != 4) return 1;\r
	\r
	ar[0] = 0x55;\r
	ar[1] = 0x41;\r
	ar[2] = 0x49;\r
	ar[3] = 0x92; \r
	\r
	// Save the tag nonce (nt)\r
	nt = bytes_to_num(receivedAnswer, 4);\r
	Dbprintf("uid: %x nt: %x", uid, nt);  \r
\r
	//  ----------------------------- crypto1 create\r
  // Init cipher with key\r
	crypto1_create(pcs, ui64Key);\r
\r
  // Load (plain) uid^nt into the cipher\r
	crypto1_word(pcs, nt ^ uid, 0);\r
\r
	par = 0;\r
  // Generate (encrypted) nr+parity by loading it into the cipher (Nr)\r
  for (pos = 0; pos < 4; pos++)\r
  {\r
    mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];\r
		par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );\r
  }	\r
		\r
  // Skip 32 bits in pseudo random generator\r
  nt = prng_successor(nt,32);\r
\r
	//  ar+parity\r
  for (pos = 4; pos < 8; pos++)\r
  {\r
		nt = prng_successor(nt,8);\r
    mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);\r
		par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );\r
  }	\r
		\r
  // Transmit reader nonce and reader answer\r
  ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);\r
\r
  // Receive 4 bit answer\r
	len = ReaderReceive(receivedAnswer);\r
  if (!len)\r
  {\r
    Dbprintf("Authentication failed. Card timeout.");\r
		return 2;\r
  }\r
	\r
  memcpy(tmp4, receivedAnswer, 4);\r
	ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);\r
	\r
	if (ntpp != bytes_to_num(tmp4, 4)) {\r
    Dbprintf("Authentication failed. Error card response.");\r
		return 3;\r
	}\r
\r
	return 0;\r
}\r
\r
int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) \r
{\r
	// variables\r
  int len;	\r
	uint8_t	bt[2];\r
	\r
  uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
	\r
  // command MIFARE_CLASSIC_READBLOCK\r
	len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);\r
	if (len == 1) {\r
		Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  \r
		return 1;\r
	}\r
	if (len != 18) {\r
		Dbprintf("Cmd Error: card timeout. len: %x", len);  \r
		return 2;\r
	}\r
\r
	memcpy(bt, receivedAnswer + 16, 2);\r
  AppendCrc14443a(receivedAnswer, 16);\r
	if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {\r
		Dbprintf("Cmd CRC response error.");  \r
		return 3;\r
	}\r
	\r
	memcpy(blockData, receivedAnswer, 16);\r
	return 0;\r
}\r
\r
int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) \r
{\r
	// variables\r
  int len, i;	\r
	uint32_t pos;\r
  uint32_t par = 0;\r
  byte_t res;\r
	\r
	uint8_t d_block[18], d_block_enc[18];\r
  uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
	\r
  // command MIFARE_CLASSIC_WRITEBLOCK\r
	len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);\r
\r
	if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK\r
		Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  \r
		return 1;\r
	}\r
	\r
	memcpy(d_block, blockData, 16);\r
	AppendCrc14443a(d_block, 16);\r
	\r
	// crypto\r
	par = 0;\r
  for (pos = 0; pos < 18; pos++)\r
  {\r
    d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];\r
		par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );\r
  }	\r
\r
  ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);\r
\r
  // Receive the response\r
	len = ReaderReceive(receivedAnswer);	\r
\r
	res = 0;\r
	for (i = 0; i < 4; i++)\r
		res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;\r
\r
	if ((len != 1) || (res != 0x0A)) {\r
		Dbprintf("Cmd send data2 Error: %02x", res);  \r
		return 2;\r
	}\r
	\r
	return 0;\r
}\r
\r
int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) \r
{\r
	// variables\r
  int len;	\r
	\r
	// Mifare HALT\r
  uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
\r
	len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);\r
  if (len != 0) {\r
		Dbprintf("halt error. response len: %x", len);  \r
		return 1;\r
	}\r
\r
	return 0;\r
}\r