From: Martin Holst Swende Date: Thu, 15 Jan 2015 14:16:34 +0000 (+0100) Subject: Implemented new FPGA mode for iclass tag simulation. Reduces arm-side size of transfe... X-Git-Tag: v2.0.0-rc1~55 X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/645c960f6111f4820c78c76f209479c3f369a8ac?ds=sidebyside Implemented new FPGA mode for iclass tag simulation. Reduces arm-side size of transfer/memory by a factor of 8. Makes for easier arm-side encoding of messages, for when we start needing to do that on the fly instead of using precalculated messages --- diff --git a/armsrc/apps.h b/armsrc/apps.h index ea70144e..6a3fa186 100644 --- a/armsrc/apps.h +++ b/armsrc/apps.h @@ -134,6 +134,8 @@ void SetAdcMuxFor(uint32_t whichGpio); #define FPGA_HF_SIMULATOR_MODULATE_BPSK (1<<0) #define FPGA_HF_SIMULATOR_MODULATE_212K (2<<0) #define FPGA_HF_SIMULATOR_MODULATE_424K (4<<0) +#define FPGA_HF_SIMULATOR_MODULATE_424K_8BIT 0x5//101 + // Options for ISO14443A #define FPGA_HF_ISO14443A_SNIFFER (0<<0) #define FPGA_HF_ISO14443A_TAGSIM_LISTEN (1<<0) diff --git a/armsrc/iclass.c b/armsrc/iclass.c index 64abc84a..329e1765 100644 --- a/armsrc/iclass.c +++ b/armsrc/iclass.c @@ -857,57 +857,93 @@ static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen) } } +static uint8_t encode4Bits(const uint8_t b) +{ + uint8_t c = b & 0xF; + // OTA, the least significant bits first + // The columns are + // 1 - Bit value to send + // 2 - Reversed (big-endian) + // 3 - Encoded + // 4 - Hex values + + switch(c){ + // 1 2 3 4 + case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55 + case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95 + case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65 + case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5 + case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59 + case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99 + case 9: return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69 + case 8: return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9 + case 7: return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56 + case 6: return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96 + case 5: return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66 + case 4: return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6 + case 3: return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a + case 2: return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a + case 1: return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a + default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa + + } +} //----------------------------------------------------------------------------- // Prepare tag messages //----------------------------------------------------------------------------- static void CodeIClassTagAnswer(const uint8_t *cmd, int len) { - //So far a dummy implementation, not used - //int lastProxToAirDuration =0; + + /* + * SOF comprises 3 parts; + * * An unmodulated time of 56.64 us + * * 24 pulses of 423.75 KHz (fc/32) + * * A logic 1, which starts with an unmodulated time of 18.88us + * followed by 8 pulses of 423.75kHz (fc/32) + * + * + * EOF comprises 3 parts: + * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated + * time of 18.88us. + * - 24 pulses of fc/32 + * - An unmodulated time of 56.64 us + * + * + * A logic 0 starts with 8 pulses of fc/32 + * followed by an unmodulated time of 256/fc (~18,88us). + * + * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by + * 8 pulses of fc/32 (also 18.88us) + * + * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag, + * works like this. + * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us). + * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us + * + * In thist mode the SOF can be written as 00011101 = 0x1D + * The EOF can be written as 10111000 = 0xb8 + * A logic 1 is 01 + * A logic 0 is 10 + * + * */ + int i; ToSendReset(); // Send SOF - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0xff;//Proxtoair duration starts here - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0x1D; for(i = 0; i < len; i++) { - int j; uint8_t b = cmd[i]; - - // Data bits - for(j = 0; j < 8; j++) { - if(b & 1) { - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0xff; - } else { - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0x00; - } - b >>= 1; - } + ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half + ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half } // Send EOF - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0x00; - + ToSend[++ToSendMax] = 0xB8; //lastProxToAirDuration = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end - // Convert from last byte pos to length ToSendMax++; } @@ -920,18 +956,9 @@ static void CodeIClassTagSOF() ToSendReset(); // Send SOF - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0xff; - ToSend[++ToSendMax] = 0x00; - ToSend[++ToSendMax] = 0xff; - + ToSend[++ToSendMax] = 0x1D; // lastProxToAirDuration = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning - // Convert from last byte pos to length ToSendMax++; } @@ -984,6 +1011,7 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain memcpy(csn_crc, datain+(i*8), 8); if(doIClassSimulation(csn_crc,1,mac_responses+i*8)) { + cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8); return; // Button pressed } } @@ -1036,23 +1064,23 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader int trace_data_size = 0; //uint8_t sof = 0x0f; - // Respond SOF -- takes 8 bytes + // Respond SOF -- takes 1 bytes uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); int resp1Len; // Anticollision CSN (rotated CSN) - // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit) - uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 10); + // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte) + uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 2); int resp2Len; // CSN - // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit) - uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 190); + // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte) + uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 30); int resp3Len; // e-Purse - // 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit) - uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 370); + // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/byte) + uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 60); int resp4Len; // + 1720.. @@ -1195,7 +1223,7 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader A legit tag has about 380us. **/ if(modulated_response_size > 0) { - SendIClassAnswer(modulated_response, modulated_response_size, timeout); + SendIClassAnswer(modulated_response, modulated_response_size, 1); t2r_time = GetCountSspClk(); } @@ -1232,7 +1260,8 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay) int i = 0, d=0;//, u = 0, d = 0; uint8_t b = 0; - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K); + //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K_8BIT); AT91C_BASE_SSC->SSC_THR = 0x00; FpgaSetupSsc(); @@ -1256,7 +1285,8 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay) AT91C_BASE_SSC->SSC_THR = b; } - if (i > respLen +4) break; +// if (i > respLen +4) break; + if (i > respLen +1) break; } return 0; diff --git a/fpga/fpga_hf.bit b/fpga/fpga_hf.bit index 5389428c..8b0c7a37 100644 Binary files a/fpga/fpga_hf.bit and b/fpga/fpga_hf.bit differ diff --git a/fpga/hi_simulate.v b/fpga/hi_simulate.v index c04ade80..0768c29d 100644 --- a/fpga/hi_simulate.v +++ b/fpga/hi_simulate.v @@ -50,12 +50,38 @@ begin else if(~(| adc_d[7:5])) after_hysteresis = 1'b0; end + // Divide 13.56 MHz by 32 to produce the SSP_CLK // The register is bigger to allow higher division factors of up to /128 -reg [6:0] ssp_clk_divider; +reg [10:0] ssp_clk_divider; + always @(posedge adc_clk) ssp_clk_divider <= (ssp_clk_divider + 1); -assign ssp_clk = ssp_clk_divider[4]; + +reg ssp_clk; +reg ssp_frame; +always @(negedge adc_clk) +begin + //If we're in 101, we only need a new bit every 8th carrier bit (53Hz). Otherwise, get next bit at 424Khz + if(mod_type == 3'b101) + begin + if(ssp_clk_divider[7:0] == 8'b00000000) + ssp_clk <= 1'b0; + if(ssp_clk_divider[7:0] == 8'b10000000) + ssp_clk <= 1'b1; + + end + else + begin + if(ssp_clk_divider[4:0] == 5'd0)//[4:0] == 5'b00000) + ssp_clk <= 1'b1; + if(ssp_clk_divider[4:0] == 5'd16) //[4:0] == 5'b10000) + ssp_clk <= 1'b0; + end +end + + +//assign ssp_clk = ssp_clk_divider[4]; // Divide SSP_CLK by 8 to produce the byte framing signal; the phase of // this is arbitrary, because it's just a bitstream. @@ -69,12 +95,13 @@ reg [2:0] ssp_frame_divider_from_arm; always @(negedge ssp_clk) ssp_frame_divider_from_arm <= (ssp_frame_divider_from_arm + 1); -reg ssp_frame; + + always @(ssp_frame_divider_to_arm or ssp_frame_divider_from_arm or mod_type) if(mod_type == 3'b000) // not modulating, so listening, to ARM ssp_frame = (ssp_frame_divider_to_arm == 3'b000); else - ssp_frame = (ssp_frame_divider_from_arm == 3'b000); + ssp_frame = (ssp_frame_divider_from_arm == 3'b000); // Synchronize up the after-hysteresis signal, to produce DIN. reg ssp_din; @@ -90,7 +117,7 @@ always @(mod_type or ssp_clk or ssp_dout) modulating_carrier <= ssp_dout ^ ssp_clk_divider[3]; // XOR means BPSK else if(mod_type == 3'b010) modulating_carrier <= ssp_dout & ssp_clk_divider[5]; // switch 212kHz subcarrier on/off - else if(mod_type == 3'b100) + else if(mod_type == 3'b100 || mod_type == 3'b101) modulating_carrier <= ssp_dout & ssp_clk_divider[4]; // switch 424kHz modulation on/off else modulating_carrier <= 1'b0; // yet unused @@ -106,7 +133,7 @@ assign pwr_oe4 = modulating_carrier; // This one is always on, so that we can watch the carrier. assign pwr_oe3 = 1'b0; -assign dbg = after_hysteresis; +assign dbg = modulating_carrier; //reg dbg; //always @(ssp_dout) // dbg <= ssp_dout;