X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/fc52fbd42f576d889826f4a0c60d18fad41bc3af..cfa9c98d573c5a0d35c6ce86501fc6fd57f91b81:/armsrc/pcf7931.c diff --git a/armsrc/pcf7931.c b/armsrc/pcf7931.c index 9aa0d9be..147f6fb8 100644 --- a/armsrc/pcf7931.c +++ b/armsrc/pcf7931.c @@ -13,11 +13,11 @@ size_t DemodPCF7931(uint8_t **outBlocks) { 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; @@ -107,7 +107,7 @@ size_t DemodPCF7931(uint8_t **outBlocks) { 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] + @@ -152,8 +152,14 @@ bool IsBlock0PCF7931(uint8_t *block) { 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; @@ -161,49 +167,52 @@ bool IsBlock1PCF7931(uint8_t *block) { 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)) { @@ -213,18 +222,23 @@ void ReadPCF7931() { } 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; @@ -234,9 +248,9 @@ void ReadPCF7931() { // 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); @@ -284,7 +298,7 @@ void ReadPCF7931() { goto end; } } - while (found_blocks != max_blocks); + while (found_blocks < max_blocks); end: Dbprintf("-----------------------------------------"); @@ -297,14 +311,14 @@ void ReadPCF7931() { Dbprintf("", 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); @@ -332,42 +346,42 @@ static void RealWritePCF7931(uint8_t *pass, uint16_t init_delay, int32_t l, int3 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<> 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], @@ -417,7 +425,7 @@ void BruteForcePCF7931(uint64_t password, uint8_t tries, uint16_t init_delay, in pass_array[4], pass_array[5], pass_array[6]); - + for (i = 0; i < tries; ++i) RealWritePCF7931 ( @@ -429,15 +437,15 @@ void BruteForcePCF7931(uint64_t password, uint8_t tries, uint16_t init_delay, in 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); @@ -446,9 +454,9 @@ void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, ui 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); } @@ -488,7 +496,7 @@ void SendCmdPCF7931(uint32_t * tab) { 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]) @@ -510,7 +518,7 @@ void SendCmdPCF7931(uint32_t * tab) { } -/* 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 @@ -519,7 +527,7 @@ void SendCmdPCF7931(uint32_t * tab) { 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; @@ -529,7 +537,7 @@ bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p) { 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 @@ -540,23 +548,23 @@ bool AddBitPCF7931(bool b, uint32_t * tab, int32_t l, int32_t p) { 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; } @@ -570,8 +578,8 @@ bool AddPatternPCF7931(uint32_t a, uint32_t b, uint32_t c, uint32_t * tab) { 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];