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[proxmark3-svn] / armsrc / iso14443a.c

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index 3f49eedb553d0ad470ffbabb7f2984b561263e8f..89ef23d484bfb836b776422c773a2702e2c65c57 100644 (file)
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -81,6 +81,8 @@ typedef struct {
 } tUart;
 
 static uint32_t iso14a_timeout;
+#define MAX_ISO14A_TIMEOUT 524288
+
 int rsamples = 0;
 uint8_t trigger = 0;
 // the block number for the ISO14443-4 PCB
@@ -1875,7 +1877,30 @@ void iso14443a_setup(uint8_t fpga_minor_mode) {
        iso14a_set_timeout(1060); // 10ms default
 }
 
-
+/* Peter Fillmore 2015
+Added card id field to the function
+ info from ISO14443A standard
+b1 = Block Number
+b2 = RFU (always 1)
+b3 = depends on block
+b4 = Card ID following if set to 1
+b5 = depends on block type
+b6 = depends on block type
+b7,b8 = block type.
+Coding of I-BLOCK:
+b8 b7 b6 b5 b4 b3 b2 b1
+0  0  0  x  x  x  1  x
+b5 = chaining bit
+Coding of R-block:
+b8 b7 b6 b5 b4 b3 b2 b1
+1  0  1  x  x  0  1  x
+b5 = ACK/NACK
+Coding of S-block:
+b8 b7 b6 b5 b4 b3 b2 b1
+1  1  x  x  x  0  1  0 
+b5,b6 = 00 - DESELECT
+        11 - WTX 
+*/    
 int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
        uint8_t parity[MAX_PARITY_SIZE];
        uint8_t real_cmd[cmd_len + 4];
@@ -1897,6 +1922,9 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
        } else{
                // S-Block WTX 
                while((data_bytes[0] & 0xF2) == 0xF2) {
+                       uint32_t save_iso14a_timeout = iso14a_timeout;
+                       // temporarily increase timeout
+                       iso14a_timeout = MAX((data_bytes[1] & 0x3f) * iso14a_timeout, MAX_ISO14A_TIMEOUT);
                        // Transmit WTX back 
                        // byte1 - WTXM [1..59]. command FWT=FWT*WTXM
                        data_bytes[1] = data_bytes[1] & 0x3f; // 2 high bits mandatory set to 0b
@@ -1904,9 +1932,11 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
                        AppendCrc14443a(data_bytes, len - 2);
                        // transmit S-Block
                        ReaderTransmit(data_bytes, len, NULL);
-                       // retrieve the result again 
+                       // retrieve the result again (with increased timeout) 
                        len = ReaderReceive(data, parity);
                        data_bytes = data;
+                       // restore timeout
+                       iso14a_timeout = save_iso14a_timeout;
                }
 
                // if we received an I- or R(ACK)-Block with a block number equal to the