]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/legicrf.c
Renamed the calccrc8 functions and command.
[proxmark3-svn] / armsrc / legicrf.c
index 86e42c1723ed98797e975a8e8aafae46710528f8..19f12a95bc5817e6ce227c8fc682e8ffa1796fd6 100644 (file)
@@ -1,5 +1,6 @@
 //-----------------------------------------------------------------------------
 // (c) 2009 Henryk Plötz <henryk@ploetzli.ch>
+//     2016 Iceman
 //
 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
 // at your option, any later version. See the LICENSE.txt file for the text of
@@ -85,7 +86,7 @@ static void setup_timer(void) {
 #define FUZZ_EQUAL(value, target, fuzz) ((value) > ((target)-(fuzz)) && (value) < ((target)+(fuzz)))
 
 #ifndef SHORT_COIL
-# define SHORT_COIL    LOW(GPIO_SSC_DOUT);
+# define SHORT_COIL     LOW(GPIO_SSC_DOUT);
 #endif
 #ifndef OPEN_COIL
 # define OPEN_COIL     HIGH(GPIO_SSC_DOUT);
@@ -102,7 +103,7 @@ static void setup_timer(void) {
                WaitTicks( (RWD_TIME_PAUSE) ); \
                OPEN_COIL; \
                WaitTicks((x)); \
-       } while (0) 
+       } while (0); 
 #endif
 
 // ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces. 
@@ -140,14 +141,13 @@ static void frame_clean(struct legic_frame * const f) {
 
 /* Generate Keystream */
 uint32_t get_key_stream(int skip, int count) {
-       uint32_t key = 0;
+
        int i;
 
        // Use int to enlarge timer tc to 32bit
        legic_prng_bc += prng_timer->TC_CV;
 
        // reset the prng timer.
-       ResetTimer(prng_timer);
 
        /* If skip == -1, forward prng time based */
        if(skip == -1) {
@@ -161,55 +161,41 @@ uint32_t get_key_stream(int skip, int count) {
 
        i = (count == 6) ? -1 : legic_read_count;
 
-       /* Write Time Data into LOG */
-       // uint8_t *BigBuf = BigBuf_get_addr();
-       // BigBuf[OFFSET_LOG+128+i] = legic_prng_count();
-       // BigBuf[OFFSET_LOG+256+i*4]   = (legic_prng_bc >> 0) & 0xff;
-       // BigBuf[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff;
-       // BigBuf[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff;
-       // BigBuf[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff;
-       // BigBuf[OFFSET_LOG+384+i] = count;
+       // log
+       //uint8_t cmdbytes[] = {bits,   BYTEx(data, 0), BYTEx(data, 1), BYTEx(send, 0), BYTEx(send, 1), legic_prng_count()};
+       //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE);
 
        /* Generate KeyStream */
-       for(i=0; i<count; i++) {
-               key |= legic_prng_get_bit() << i;
-               legic_prng_forward(1);
-       }
-       return key;
+       return legic_prng_get_bits(count);
 }
 
 /* Send a frame in tag mode, the FPGA must have been set up by
  * LegicRfSimulate
  */
-void frame_send_tag(uint16_t response, uint8_t bits, uint8_t crypt) {
+void frame_send_tag(uint16_t response, uint8_t bits) {
+
+       uint16_t mask = 1;
+       
        /* Bitbang the response */
-       LOW(GPIO_SSC_DOUT);
+       SHORT_COIL;
        AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
 
-       /* Use time to crypt frame */
-       if(crypt) {
-               legic_prng_forward(2); /* TAG_FRAME_WAIT -> shift by 2 */
-               response ^= legic_prng_get_bits(bits);
-       }
+        /* TAG_FRAME_WAIT -> shift by 2 */
+       legic_prng_forward(2);
+       response ^= legic_prng_get_bits(bits);
 
        /* Wait for the frame start */
-       WaitUS( TAG_FRAME_WAIT );
-
-       uint8_t bit = 0;
-       for(int i = 0; i < bits; i++) {
+       WaitTicks( TAG_FRAME_WAIT );
 
-               bit = response & 1;
-               response >>= 1;
-
-               if (bit)
-                       HIGH(GPIO_SSC_DOUT);
+       for (; mask < BITMASK(bits); mask <<= 1) {      
+               if (response & mask)
+                       OPEN_COIL
                else
-                       LOW(GPIO_SSC_DOUT);
-                 
-               WaitUS(100);
+                       SHORT_COIL
+               WaitTicks(TAG_BIT_PERIOD);
    }
-   LOW(GPIO_SSC_DOUT);
+   SHORT_COIL;
 }
 
 /* Send a frame in reader mode, the FPGA must have been set up by
@@ -225,9 +211,9 @@ void frame_sendAsReader(uint32_t data, uint8_t bits){
                                
        for (; mask < BITMASK(bits); mask <<= 1) {      
                if (send & mask)
-                       COIL_PULSE(RWD_TIME_1);
+                       COIL_PULSE(RWD_TIME_1)
                else
-                       COIL_PULSE(RWD_TIME_0);
+                       COIL_PULSE(RWD_TIME_0)
        }
 
        // Final pause to mark the end of the frame
@@ -421,19 +407,15 @@ int legic_read_byte( uint16_t index, uint8_t cmd_sz) {
  * - wait until the tag sends back an ACK ('1' bit unencrypted)
  * - forward the prng based on the timing
  */
-//int legic_write_byte(int byte, int addr, int addr_sz, int PrngCorrection) {
-int legic_write_byte(uint8_t byte, uint16_t addr, uint8_t addr_sz) {
-
-    //do not write UID, CRC at offset 0-4.
-       if (addr <= 4) return 0;
+int legic_write_byte(uint16_t index, uint8_t byte, uint8_t addr_sz) {
 
        // crc
        crc_clear(&legic_crc);
        crc_update(&legic_crc, 0, 1); /* CMD_WRITE */
-       crc_update(&legic_crc, addr, addr_sz);
+       crc_update(&legic_crc, index, addr_sz);
        crc_update(&legic_crc, byte, 8);
        uint32_t crc = crc_finish(&legic_crc);
-       uint32_t crc2 = legic4Crc(LEGIC_WRITE, addr, byte, addr_sz+1);
+       uint32_t crc2 = legic4Crc(LEGIC_WRITE, index, byte, addr_sz+1);
        if ( crc != crc2 ) {
                Dbprintf("crc is missmatch");
                return 1;
@@ -441,25 +423,26 @@ int legic_write_byte(uint8_t byte, uint16_t addr, uint8_t addr_sz) {
        // send write command
        uint32_t cmd = ((crc     <<(addr_sz+1+8)) //CRC
                    |(byte    <<(addr_sz+1))   //Data
-                   |(addr    <<1)             //Address
-                   | LEGIC_WRITE);             //CMD = Write
+                   |(index    <<1)             //index
+                   | LEGIC_WRITE);            //CMD = Write
                                   
     uint32_t cmd_sz = addr_sz+1+8+4;          //crc+data+cmd
 
-    legic_prng_forward(2); /* we wait anyways */
+    legic_prng_forward(2);
        
        WaitTicks(330);
        
        frame_sendAsReader(cmd, cmd_sz);
-   
+
+       // wait for ack
        AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
 
-       // wait for ack
     int t, old_level = 0, edges = 0;
     int next_bit_at = 0;
 
-       WaitUS(TAG_FRAME_WAIT);
+       // ACK 3.6ms = 3600us * 1.5 = 5400ticks.
+       WaitTicks(5360);
 
     for( t = 0; t < 80; ++t) {
         edges = 0;
@@ -471,7 +454,8 @@ int legic_write_byte(uint8_t byte, uint16_t addr, uint8_t addr_sz) {
 
             old_level = level;
         }
-        if(edges > 20 ) { /* expected are 42 edges */
+               /* expected are 42 edges (ONE) */
+        if(edges > 20 ) {
                        int t = timer->TC_CV;
                        int c = t / TAG_BIT_PERIOD;
                        
@@ -481,7 +465,6 @@ int legic_write_byte(uint8_t byte, uint16_t addr, uint8_t addr_sz) {
         }
     }
 
-       ResetTimer(timer);
        return -1;
 }
 
@@ -526,51 +509,16 @@ OUT:
     return 0;
 }
 
-/*int _LegicRfWriter(int offset, int bytes, int addr_sz, uint8_t *BigBuf, int RoundBruteforceValue) {
-       int byte_index=0;
-
-    LED_B_ON();
-       setup_phase_reader(iv);
-    //legic_prng_forward(2);
-       while(byte_index < bytes) {
-               int r;
-
-               //check if the DCF should be changed
-               if ( (offset == 0x05) && (bytes == 0x02) ) {
-                       //write DCF in reverse order (addr 0x06 before 0x05)
-                       r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz, RoundBruteforceValue);
-                       //legic_prng_forward(1);
-                       if(r == 0) {
-                               byte_index++;
-                               r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz, RoundBruteforceValue);
-                       }
-                       //legic_prng_forward(1);
-               }
-               else {
-                       r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz, RoundBruteforceValue);
-               }
-               if((r != 0) || BUTTON_PRESS()) {
-                       Dbprintf("operation aborted @ 0x%03.3x", byte_index);
-       switch_off_tag_rwd();
-                       LED_B_OFF();
-                       LED_C_OFF();
-                       return -1;
-               }
-
-        WDT_HIT();
-               byte_index++;
-        if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
-       }
-    LED_B_OFF();
-    LED_C_OFF();
-    DbpString("write successful");
-    return 0;
-}*/
-
-void LegicRfWriter(uint16_t offset, uint16_t bytes, uint8_t iv) {
+void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
 
-       int byte_index = 0;  
        uint8_t isOK = 1;
+       
+       // UID not is writeable.
+       if ( offset <= 4 ) {
+               isOK = 0;
+               goto OUT;
+       }
+       
        legic_card_select_t card;
        
        LegicCommonInit();
@@ -580,63 +528,40 @@ void LegicRfWriter(uint16_t offset, uint16_t bytes, uint8_t iv) {
                goto OUT;
        }
        
-       switch_off_tag_rwd();
-       
-       switch(card.tagtype) {
-               case 0x0d:
-                       if(offset+bytes > 22) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset + bytes);
-                               return;
-                       }
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset + bytes);
-                       break;
-               case 0x1d:
-                       if(offset+bytes > 0x100) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset + bytes);
-                               return;
-                       }
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset + bytes);
-                       break;
-               case 0x3d:
-                       if(offset+bytes > 0x400) {
-                       Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset + bytes);
-                       return;
-               }
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing 0x%03.3x - 0x%03.3x ...", offset, offset + bytes);
-                       break;
-               default:
-            return;
-       }
+       if (len + offset >= card.cardsize)
+               len = card.cardsize - offset;
 
-    LED_B_ON();
        setup_phase_reader(iv);
-       
-       int r = 0;
-       while(byte_index < bytes) {
 
-               //check if the DCF should be changed
-               if ( ((byte_index+offset) == 0x05) && (bytes >= 0x02) ) {
-                       //write DCF in reverse order (addr 0x06 before 0x05)
-                       r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), card.addrsize);
-
-                       // write second byte on success
-                       if(r == 0) {
-                               byte_index++;
-                               r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), card.addrsize);
-                       }
-               }
-               else {
-                       r = legic_write_byte(cardmem[byte_index+offset], byte_index+offset, card.addrsize);
-               }
+    LED_B_ON();        
+       int r = 0;
+       // how about we write backwards instead. no need for this extra DCF check.      
+       // index = len - cardsize
+       // stops uid 01234, 
+       /*
+       len = 20
+       offset = 5
+       
+       index = 20+5 = 25
+       if ( index > cardsize ) return -1;
+       
+       loop
+               write( cardmem[index], index , card.addrsize);
+               --index;
+       end loop        
+       */
+       uint16_t index = len;
+       while(index > 4) {
+
+               r = legic_write_byte( index, cardmem[ index ], card.addrsize);
                
-               if ((r != 0) || BUTTON_PRESS()) {
-                       Dbprintf("operation aborted @ 0x%03.3x", byte_index);
+               if ( r ) {
+                       Dbprintf("operation aborted @ 0x%03.3x", index);
                        isOK = 0;
                        goto OUT;
                }
-
-        WDT_HIT();
-               byte_index++;
+               --index;
+               WDT_HIT();
        }
 
 OUT:
@@ -645,66 +570,6 @@ OUT:
        LEDsoff();      
 }
 
-void LegicRfRawWriter(int address, int byte, uint8_t iv) {
-
-       int byte_index = 0, addr_sz = 0;
-       
-       LegicCommonInit();
-       
-       if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card");
-       
-       uint32_t tag_type = setup_phase_reader(iv);
-       
-       switch_off_tag_rwd();
-       
-       switch(tag_type) {
-               case 0x0d:
-                       if(address > 22) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM22", address);
-                               return;
-                       }
-                       addr_sz = 5;
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
-                       break;
-               case 0x1d:
-                       if(address > 0x100) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM256", address);
-                               return;
-                       }
-                       addr_sz = 8;
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
-                       break;
-               case 0x3d:
-                       if(address > 0x400) {
-                       Dbprintf("Error: can not write to 0x%03.3x on MIM1024", address);
-                       return;
-               }
-                       addr_sz = 10;
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", address, byte);
-                       break;
-               default:
-                       Dbprintf("No or unknown card found, aborting");
-            return;
-       }
-       
-       Dbprintf("integer value: %d address: %d  addr_sz: %d", byte, address, addr_sz);
-    LED_B_ON();
-       
-       setup_phase_reader(iv);
-               
-       int r = legic_write_byte(byte, address, addr_sz);
-               
-       if((r != 0) || BUTTON_PRESS()) {
-               Dbprintf("operation aborted @ 0x%03.3x (%1d)", byte_index, r);
-               switch_off_tag_rwd();
-               LEDsoff();
-               return;
-       }
-
-    LEDsoff();
-    if ( MF_DBGLEVEL >= 1) DbpString("write successful");
-}
-
 int legic_select_card_iv(legic_card_select_t *p_card, uint8_t iv){
 
        if ( p_card == NULL ) return 1;
@@ -739,8 +604,42 @@ int legic_select_card(legic_card_select_t *p_card){
        return legic_select_card_iv(p_card, 0x01);
 }
 
+//-----------------------------------------------------------------------------
+// Work with emulator memory
+// 
+// Note: we call FpgaDownloadAndGo(FPGA_BITSTREAM_HF) here although FPGA is not
+// involved in dealing with emulator memory. But if it is called later, it might
+// destroy the Emulator Memory.
+//-----------------------------------------------------------------------------
+// arg0 = offset
+// arg1 = num of bytes
+void LegicEMemSet(uint32_t arg0, uint32_t arg1, uint8_t *data) {
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       legic_emlset_mem(data, arg0, arg1);
+}
+// arg0 = offset
+// arg1 = num of bytes
+void LegicEMemGet(uint32_t arg0, uint32_t arg1) {
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       uint8_t buf[USB_CMD_DATA_SIZE] = {0x00};
+       legic_emlget_mem(buf, arg0, arg1);
+       LED_B_ON();
+       cmd_send(CMD_ACK, arg0, arg1, 0, buf, USB_CMD_DATA_SIZE);
+       LED_B_OFF();
+}
+void legic_emlset_mem(uint8_t *data, int offset, int numofbytes) {
+       cardmem = BigBuf_get_EM_addr();
+       memcpy(cardmem + offset, data, numofbytes);
+}
+void legic_emlget_mem(uint8_t *data, int offset, int numofbytes) {
+       cardmem = BigBuf_get_EM_addr();
+       memcpy(data, cardmem + offset, numofbytes);
+}
+
 void LegicRfInfo(void){
 
+       int r;
+       
        uint8_t buf[sizeof(legic_card_select_t)] = {0x00};
        legic_card_select_t *card = (legic_card_select_t*) buf;
        
@@ -753,7 +652,7 @@ void LegicRfInfo(void){
 
        // read UID bytes
        for ( uint8_t i = 0; i < sizeof(card->uid); ++i) {
-               int r = legic_read_byte(i, card->cmdsize);
+               r = legic_read_byte(i, card->cmdsize);
                if ( r == -1 ) {
                        cmd_send(CMD_ACK,0,0,0,0,0);
                        goto OUT;
@@ -761,6 +660,15 @@ void LegicRfInfo(void){
                card->uid[i] = r & 0xFF;
        }
 
+       // MCC byte.
+       r = legic_read_byte(4, card->cmdsize);
+       uint32_t calc_mcc =  CRC8Legic(card->uid, 4);;
+       if ( r != calc_mcc) {
+               cmd_send(CMD_ACK,0,0,0,0,0);
+               goto OUT;
+       }
+       
+       // OK
        cmd_send(CMD_ACK, 1, 0, 0, buf, sizeof(legic_card_select_t));
 
 OUT:
@@ -775,26 +683,26 @@ static void frame_handle_tag(struct legic_frame const * const f)
 {
        uint8_t *BigBuf = BigBuf_get_addr();
 
-   /* First Part of Handshake (IV) */
-   if(f->bits == 7) {
+       /* First Part of Handshake (IV) */
+       if(f->bits == 7) {
+
+               LED_C_ON();
 
-        LED_C_ON();
-        
                // Reset prng timer
                ResetTimer(prng_timer);
-               
-        legic_prng_init(f->data);
-        frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1B */
-        legic_state = STATE_IV;
-        legic_read_count = 0;
-        legic_prng_bc = 0;
-        legic_prng_iv = f->data;
+
+               legic_prng_init(f->data);
+               frame_send_tag(0x3d, 6); /* 0x3d^0x26 = 0x1B */
+               legic_state = STATE_IV;
+               legic_read_count = 0;
+               legic_prng_bc = 0;
+               legic_prng_iv = f->data;
+
+
                ResetTimer(timer);
                WaitUS(280);
-        return;
-   }
+               return;
+       }
 
    /* 0x19==??? */
    if(legic_state == STATE_IV) {
@@ -828,7 +736,7 @@ static void frame_handle_tag(struct legic_frame const * const f)
          //Dbprintf("Data:%03.3x, key:%03.3x, addr: %03.3x, read_c:%u", f->data, key, addr, read_c);
          legic_prng_forward(legic_reqresp_drift);
 
-         frame_send_tag(hash | data, 12, 1);
+         frame_send_tag(hash | data, 12);
 
                 ResetTimer(timer);
          legic_prng_forward(2);
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