#include "proxmark3.h"
#include "apps.h"
+#include "usb_cdc.h"
#include "lfsampling.h"
#include "pcf7931.h"
#include "util.h"
#include "string.h"
+#include "fpgaloader.h"
#define T0_PCF 8 //period for the pcf7931 in us
#define ALLOC 16
uint8_t bits[256] = {0x00};
uint8_t blocks[8][16];
uint8_t *dest = BigBuf_get_addr();
-
+
int GraphTraceLen = BigBuf_max_traceLen();
if (GraphTraceLen > 18000)
GraphTraceLen = 18000;
-
+
int i, j, lastval, bitidx, half_switch;
int clock = 64;
int tolerance = clock / 8;
for(j = 0; j < 16; ++j) {
blocks[num_blocks][j] =
128 * bits[j*8 + 7]+
- 64 * bits[j*8 + 6] +
+ 64 * bits[j*8 + 6] +
32 * bits[j*8 + 5] +
16 * bits[j*8 + 4] +
8 * bits[j*8 + 3] +
bool IsBlock1PCF7931(uint8_t *block) {
// assuming all RFU bits are set to 0
+
+ uint8_t rb1 = block[14] & 0x80;
+ uint8_t rfb = block[14] & 0x7f;
+ uint8_t rlb = block[15];
+
if (block[10] == 0 && block[11] == 0 && block[12] == 0 && block[13] == 0)
- if((block[14] & 0x7f) <= 9 && block[15] <= 9)
+ // block 1 is sent only if (RLB >= 1 && RFB <= 1) or RB1 enabled
+ if(rfb <= rlb && rfb <= 9 && rlb <= 9 && ((rfb <= 1 && rlb >= 1) || rb1))
return true;
return false;
void ReadPCF7931() {
int found_blocks = 0; // successfully read blocks
- int max_blocks = 8; // readable blocks
+ int max_blocks = 8; // readable blocks
uint8_t memory_blocks[8][17]; // PCF content
-
+
uint8_t single_blocks[8][17]; // PFC blocks with unknown position
int single_blocks_cnt = 0;
- size_t n = 0; // transmitted blocks
+ size_t n = 0; // transmitted blocks
uint8_t tmp_blocks[4][16]; // temporary read buffer
-
+
uint8_t found_0_1 = 0; // flag: blocks 0 and 1 were found
int errors = 0; // error counter
int tries = 0; // tries counter
-
+
memset(memory_blocks, 0, 8*17*sizeof(uint8_t));
memset(single_blocks, 0, 8*17*sizeof(uint8_t));
-
+
int i = 0, j = 0;
do {
i = 0;
-
+
memset(tmp_blocks, 0, 4*16*sizeof(uint8_t));
n = DemodPCF7931((uint8_t**)tmp_blocks);
if(!n)
++errors;
-
- // exit if no block is received
+
+ // exit if no block is received
if (errors >= 10 && found_blocks == 0 && single_blocks_cnt == 0) {
Dbprintf("Error, no tag or bad tag");
return;
}
- // exit if too many errors during reading
+
+ // exit if too many errors during reading
if (tries > 50 && (2*errors > tries)) {
Dbprintf("Error reading the tag");
Dbprintf("Here is the partial content");
goto end;
}
-
+
// our logic breaks if we don't get at least two blocks
if (n < 2) {
+ // skip if all 0s block or no blocks
if (n == 0 || !memcmp(tmp_blocks[0], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16))
continue;
+ // add block to single blocks list
if (single_blocks_cnt < max_blocks) {
for (i = 0; i < single_blocks_cnt; ++i) {
if (!memcmp(single_blocks[i], tmp_blocks[0], 16)) {
}
if (j != 1) {
memcpy(single_blocks[single_blocks_cnt], tmp_blocks[0], 16);
+ print_result("got single block", single_blocks[single_blocks_cnt], 16);
single_blocks_cnt++;
}
j = 0;
}
++tries;
continue;
- }
-
- Dbprintf("(dbg) got %d blocks (%d/%d found) (%d tries, %d errors)", n, found_blocks, (max_blocks == 0 ? found_blocks : max_blocks), tries, errors);
+ }
+
+ Dbprintf("(dbg) got %d blocks (%d/%d found) (%d tries, %d errors)", n, found_blocks, (max_blocks == 0 ? found_blocks : max_blocks), tries, errors);
+ for (i = 0; i < n; ++i)
+ {
+ print_result("got consecutive blocks", tmp_blocks[i], 16);
+ }
i = 0;
- if(!found_0_1) {
+ if(!found_0_1) {
while (i < n - 1) {
if (IsBlock0PCF7931(tmp_blocks[i]) && IsBlock1PCF7931(tmp_blocks[i+1])) {
found_0_1 = 1;
// block 1 tells how many blocks are going to be sent
max_blocks = MAX((memory_blocks[1][14] & 0x7f), memory_blocks[1][15]) + 1;
found_blocks = 2;
-
+
Dbprintf("Found blocks 0 and 1. PCF is transmitting %d blocks.", max_blocks);
-
+
// handle the following blocks
for (j = i + 2; j < n; ++j) {
memcpy(memory_blocks[found_blocks], tmp_blocks[j], 16);
goto end;
}
}
- while (found_blocks != max_blocks);
+ while (found_blocks < max_blocks);
end:
Dbprintf("-----------------------------------------");
Dbprintf("<missing block %d>", i);
}
Dbprintf("-----------------------------------------");
-
+
if (found_blocks < max_blocks) {
Dbprintf("-----------------------------------------");
Dbprintf("Blocks with unknown position:");
Dbprintf("-----------------------------------------");
for (i = 0; i < single_blocks_cnt; ++i)
print_result("Block", single_blocks[i], 16);
-
+
Dbprintf("-----------------------------------------");
}
cmd_send(CMD_ACK,0,0,0,0,0);
AddBytePCF7931(pass[6], tab, l, p);
//programming mode (0 or 1)
AddBitPCF7931(0, tab, l, p);
-
+
//block adress on 6 bits
for (u = 0; u < 6; ++u) {
- if (address & (1 << u)) { // bit 1
+ if (address & (1 << u)) { // bit 1
++parity;
AddBitPCF7931(1, tab, l, p);
- } else { // bit 0
+ } else { // bit 0
AddBitPCF7931(0, tab, l, p);
}
}
-
+
//byte address on 4 bits
for (u = 0; u < 4; ++u)
{
- if (byte & (1 << u)) { // bit 1
+ if (byte & (1 << u)) { // bit 1
parity++;
AddBitPCF7931(1, tab, l, p);
}
- else // bit 0
+ else // bit 0
AddBitPCF7931(0, tab, l, p);
}
-
+
//data on 8 bits
for (u=0; u<8; u++)
{
- if (data&(1<<u)) { // bit 1
+ if (data&(1<<u)) { // bit 1
parity++;
AddBitPCF7931(1, tab, l, p);
- }
- else //bit 0
+ }
+ else //bit 0
AddBitPCF7931(0, tab, l, p);
}
//parity bit
if ((parity % 2) == 0)
- AddBitPCF7931(0, tab, l, p); //even parity
+ AddBitPCF7931(0, tab, l, p); //even parity
else
AddBitPCF7931(1, tab, l, p);//odd parity
void BruteForcePCF7931(uint64_t password, uint8_t tries, uint16_t init_delay, int32_t l, int32_t p) {
uint8_t i = 0;
uint8_t pass_array[7];
-
+
while (password < 0x00FFFFFFFFFFFFFF) {
if (BUTTON_PRESS()) {
Dbprintf("Button pressed, stopping bruteforce ...");
return;
}
-
- pass_array[0] = password & 0xFF;
- pass_array[1] = (password >> 8) & 0xFF;
- pass_array[2] = (password >> 16) & 0xFF;
- pass_array[3] = (password >> 24) & 0xFF;
- pass_array[4] = (password >> 32) & 0xFF;
- pass_array[5] = (password >> 40) & 0xFF;
- pass_array[6] = (password >> 48) & 0xFF;
+
+ num_to_bytes(password, 7, pass_array);
Dbprintf("Trying: %02x %02x %02x %02x %02x %02x %02x ...",
pass_array[0],
pass_array[4],
pass_array[5],
pass_array[6]);
-
+
for (i = 0; i < tries; ++i)
RealWritePCF7931
(
7,
0x01
);
-
- ++password;
+
+ ++password;
}
}
/* Write on a byte of a PCF7931 tag
* @param address : address of the block to write
@param byte : address of the byte to write
- @param data : data to write
+ @param data : data to write
*/
void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, uint8_t pass5, uint8_t pass6, uint8_t pass7, uint16_t init_delay, int32_t l, int32_t p, uint8_t address, uint8_t byte, uint8_t data) {
Dbprintf("Initialization delay : %d us", init_delay);
Dbprintf("Block address : %02x", address);
Dbprintf("Byte address : %02x", byte);
Dbprintf("Data : %02x", data);
-
+
uint8_t password[7] = {pass1, pass2, pass3, pass4, pass5, pass6, pass7};
-
+
RealWritePCF7931 (password, init_delay, l, p, address, byte, data);
}
HIGH(GPIO_SSC_DOUT);
while(tempo != tab[u])
tempo = AT91C_BASE_TC0->TC_CV;
-
+
// stop modulating antenna
LOW(GPIO_SSC_DOUT);
while(tempo != tab[u+1])
}
-/* Add a byte for building the data frame of PCF7931 tags
+/* Add a byte for building the data frame of PCF7931 tags
* @param b : byte to add
* @param tab : array of the data frame
* @param l : offset on low pulse width
bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p) {
uint32_t u;
for (u = 0; u < 8; ++u) {
- if (byte & (1 << u)) { //bit is 1
+ if (byte & (1 << u)) { //bit is 1
if(AddBitPCF7931(1, tab, l, p)==1)return 1;
} else { //bit is 0
if(AddBitPCF7931(0, tab, l, p)==1)return 1;
return 0;
}
-/* Add a bits for building the data frame of PCF7931 tags
+/* Add a bits for building the data frame of PCF7931 tags
* @param b : bit to add
* @param tab : array of the data frame
* @param l : offset on low pulse width
for (u = 0; tab[u] != 0; u += 3){} //we put the cursor at the last value of the array
- if (b == 1) { //add a bit 1
- if (u == 0) tab[u] = 34 * T0_PCF + p;
- else tab[u] = 34 * T0_PCF + tab[u-1] + p;
+ if (b == 1) { //add a bit 1
+ if (u == 0) tab[u] = 34 * T0_PCF + p;
+ else tab[u] = 34 * T0_PCF + tab[u-1] + p;
tab[u+1] = 6 * T0_PCF+tab[u] + l;
tab[u+2] = 88 * T0_PCF+tab[u + 1] - l - p;
return 0;
- } else { //add a bit 0
+ } else { //add a bit 0
- if (u == 0) tab[u] = 98 * T0_PCF + p;
- else tab[u] = 98 * T0_PCF + tab[u-1] + p;
+ if (u == 0) tab[u] = 98 * T0_PCF + p;
+ else tab[u] = 98 * T0_PCF + tab[u-1] + p;
tab[u + 1] = 6 * T0_PCF + tab[u] + l;
tab[u + 2] = 24 * T0_PCF + tab[u + 1] - l - p;
return 0;
}
-
+
return 1;
}
uint32_t u = 0;
for(u = 0; tab[u] != 0; u += 3){} //we put the cursor at the last value of the array
- if (u == 0) tab[u] = a;
- else tab[u] = a + tab[u - 1];
+ if (u == 0) tab[u] = a;
+ else tab[u] = a + tab[u - 1];
tab[u + 1] = b + tab[u];
tab[u + 2] = c + tab[u + 1];
projects / proxmark3-svn / blobdiff