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https://github.com/Proxmark/proxmark3.git
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add : writing on PCF7931 tags
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Dake
parent
5d01f50ae1
commit
dc4300bafb
6 changed files with 388 additions and 7 deletions
283
armsrc/lfops.c
283
armsrc/lfops.c
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@ -16,8 +16,7 @@
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#include "string.h"
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#include "lfdemod.h"
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#include "lfsampling.h"
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#include "usb_cdc.h"
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#include "usb_cdc.h" //test
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/**
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* Function to do a modulation and then get samples.
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@ -214,6 +213,8 @@ void ReadTItag(void)
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}
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}
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void WriteTIbyte(uint8_t b)
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{
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int i = 0;
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@ -310,12 +311,17 @@ void AcquireTiType(void)
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}
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}
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// arguments: 64bit data split into 32bit idhi:idlo and optional 16bit crc
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// if crc provided, it will be written with the data verbatim (even if bogus)
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// if not provided a valid crc will be computed from the data and written.
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void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
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{
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FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
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FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
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if(crc == 0) {
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crc = update_crc16(crc, (idlo)&0xff);
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crc = update_crc16(crc, (idlo>>8)&0xff);
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@ -1705,6 +1711,8 @@ int DemodPCF7931(uint8_t **outBlocks) {
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if(num_blocks == 4) break;
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}
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memcpy(outBlocks, Blocks, 16*num_blocks);
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
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return num_blocks;
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}
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@ -1828,14 +1836,21 @@ void ReadPCF7931() {
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Dbprintf("Memory content:");
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Dbprintf("-----------------------------------------");
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for(i=0; i<max_blocks; i++) {
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if(Blocks[i][ALLOC]==1)
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if(Blocks[i][ALLOC]==1){
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Dbprintf("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
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Blocks[i][0], Blocks[i][1], Blocks[i][2], Blocks[i][3], Blocks[i][4], Blocks[i][5], Blocks[i][6], Blocks[i][7],
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Blocks[i][8], Blocks[i][9], Blocks[i][10], Blocks[i][11], Blocks[i][12], Blocks[i][13], Blocks[i][14], Blocks[i][15]);
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else
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if(i==3){
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if(Blocks[3][0] == 0xAA)
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Dbprintf("Solde actuel : %d centimes, solde précédent : %d centimes", (Blocks[3][1] << 8 | Blocks[3][2]), (Blocks[3][6] << 8 | Blocks[3][7]));
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else
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Dbprintf("Solde actuel : %d centimes, solde précédent : %d centimes", (Blocks[3][6] << 8 | Blocks[3][7]), (Blocks[3][1] << 8 | Blocks[3][2]));
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}
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}else
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Dbprintf("<missing block %d>", i);
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}
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Dbprintf("-----------------------------------------");
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return ;
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}
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@ -2058,3 +2073,261 @@ void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
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LED_D_OFF();
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}
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#define T0_PCF 8 //period for the pcf7931 in us
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/* Write on a byte of a PCF7931 tag
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* @param address : address of the block to write
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@param byte : address of the byte to write
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@param data : data to write
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*/
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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)
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{
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uint32_t tab[1024]={0}; // data times frame
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uint32_t u = 0;
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uint8_t parity = 0;
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bool comp = 0;
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//BUILD OF THE DATA FRAME
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//alimentation of the tag (time for initializing)
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AddPatternPCF7931(init_delay, 0, 8192/2*T0_PCF, tab);
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//PMC
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Dbprintf("Initialization delay : %d us", init_delay);
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AddPatternPCF7931(8192/2*T0_PCF + 319*T0_PCF+70, 3*T0_PCF, 29*T0_PCF, tab);
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Dbprintf("Offsets : %d us on the low pulses width, %d us on the low pulses positions", l, p);
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//password indication bit
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AddBitPCF7931(1, tab, l, p);
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//password (on 56 bits)
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Dbprintf("Password (LSB first on each byte) : %02x %02x %02x %02x %02x %02x %02x", pass1,pass2,pass3,pass4,pass5,pass6,pass7);
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AddBytePCF7931(pass1, tab, l, p);
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AddBytePCF7931(pass2, tab, l, p);
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AddBytePCF7931(pass3, tab, l, p);
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AddBytePCF7931(pass4, tab, l, p);
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AddBytePCF7931(pass5, tab, l, p);
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AddBytePCF7931(pass6, tab, l, p);
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AddBytePCF7931(pass7, tab, l, p);
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//programming mode (0 or 1)
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AddBitPCF7931(0, tab, l, p);
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//block adress on 6 bits
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Dbprintf("Block address : %02x", address);
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for (u=0; u<6; u++)
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{
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if (address&(1<<u)) { // bit 1
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parity++;
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AddBitPCF7931(1, tab, l, p);
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} else{ // bit 0
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AddBitPCF7931(0, tab, l, p);
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}
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}
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//byte address on 4 bits
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Dbprintf("Byte address : %02x", byte);
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for (u=0; u<4; u++)
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{
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if (byte&(1<<u)) { // bit 1
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parity++;
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AddBitPCF7931(1, tab, l, p);
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} else{ // bit 0
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AddBitPCF7931(0, tab, l, p);
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}
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}
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//data on 8 bits
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Dbprintf("Data : %02x", data);
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for (u=0; u<8; u++)
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{
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if (data&(1<<u)) { // bit 1
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parity++;
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AddBitPCF7931(1, tab, l, p);
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} else{ //bit 0
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AddBitPCF7931(0, tab, l, p);
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}
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}
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//parity bit
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if((parity%2)==0){
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AddBitPCF7931(0, tab, l, p); //even parity
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}else{
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AddBitPCF7931(1, tab, l, p);//odd parity
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}
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//time access memory
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AddPatternPCF7931(5120+2680, 0, 0, tab);
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//conversion of the scale time
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for(u=0;u<500;u++){
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tab[u]=(tab[u] * 3)/2;
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}
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//compennsation of the counter reload
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while (!comp){
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comp = 1;
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for(u=0;tab[u]!=0;u++){
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if(tab[u] > 0xFFFF){
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tab[u] -= 0xFFFF;
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comp = 0;
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}
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}
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}
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SendCmdPCF7931(tab);
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}
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/* Send a trame to a PCF7931 tags
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* @param tab : array of the data frame
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*/
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void SendCmdPCF7931(uint32_t * tab){
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uint16_t u=0;
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uint16_t tempo=0;
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Dbprintf("SENDING DATA FRAME...");
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FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
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FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
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FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU );
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LED_A_ON();
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// steal this pin from the SSP and use it to control the modulation
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AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
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AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
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//initialization of the timer
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AT91C_BASE_PMC->PMC_PCER |= (0x1 << 12) | (0x1 << 13) | (0x1 << 14);
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AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
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AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
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AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; //clock at 48/32 MHz
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AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;
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AT91C_BASE_TCB->TCB_BCR = 1;
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tempo = AT91C_BASE_TC0->TC_CV;
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for(u=0;tab[u]!= 0;u+=3){
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// modulate antenna
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HIGH(GPIO_SSC_DOUT);
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while(tempo != tab[u]){
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tempo = AT91C_BASE_TC0->TC_CV;
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}
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// stop modulating antenna
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LOW(GPIO_SSC_DOUT);
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while(tempo != tab[u+1]){
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tempo = AT91C_BASE_TC0->TC_CV;
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}
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// modulate antenna
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HIGH(GPIO_SSC_DOUT);
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while(tempo != tab[u+2]){
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tempo = AT91C_BASE_TC0->TC_CV;
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}
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}
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LED_A_OFF();
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
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SpinDelay(200);
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AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
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DbpString("FINISH !");
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DbpString("(Could be usefull to send the same trame many times)");
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LED(0xFFFF, 1000);
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}
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/* Add a byte for building the data frame of PCF7931 tags
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* @param b : byte to add
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* @param tab : array of the data frame
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* @param l : offset on low pulse width
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* @param p : offset on low pulse positioning
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*/
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bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p){
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uint32_t u;
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for (u=0; u<8; u++)
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{
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if (byte&(1<<u)) { //bit à 1
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if(AddBitPCF7931(1, tab, l, p)==1)return 1;
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} else { //bit à 0
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if(AddBitPCF7931(0, tab, l, p)==1)return 1;
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}
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}
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return 0;
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}
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/* Add a bits for building the data frame of PCF7931 tags
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* @param b : bit to add
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* @param tab : array of the data frame
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* @param l : offset on low pulse width
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* @param p : offset on low pulse positioning
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*/
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bool AddBitPCF7931(bool b, uint32_t * tab, int32_t l, int32_t p){
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uint8_t u = 0;
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for(u=0;tab[u]!=0;u+=3){} //we put the cursor at the last value of the array
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if(b==1){ //add a bit 1
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if(u==0) tab[u] = 34*T0_PCF+p;
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else tab[u] = 34*T0_PCF+tab[u-1]+p;
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tab[u+1] = 6*T0_PCF+tab[u]+l;
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tab[u+2] = 88*T0_PCF+tab[u+1]-l-p;
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return 0;
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}else{ //add a bit 0
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if(u==0) tab[u] = 98*T0_PCF+p;
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else tab[u] = 98*T0_PCF+tab[u-1]+p;
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tab[u+1] = 6*T0_PCF+tab[u]+l;
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tab[u+2] = 24*T0_PCF+tab[u+1]-l-p;
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return 0;
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}
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return 1;
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}
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/* Add a custom pattern in the data frame
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* @param a : delay of the first high pulse
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* @param b : delay of the low pulse
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* @param c : delay of the last high pulse
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* @param tab : array of the data frame
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*/
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bool AddPatternPCF7931(uint32_t a, uint32_t b, uint32_t c, uint32_t * tab){
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uint32_t u = 0;
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for(u=0;tab[u]!=0;u+=3){} //we put the cursor at the last value of the array
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if(u==0) tab[u] = a;
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else tab[u] = a + tab[u-1];
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tab[u+1] = b+tab[u];
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tab[u+2] = c+tab[u+1];
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return 0;
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}
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