X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/e17660d5f7dfa44447068e7897ee6454157d2ae1..577b1c27f5baab911609412a5dc15a95b92504d9:/armsrc/mifarecmd.c

diff --git a/armsrc/mifarecmd.c b/armsrc/mifarecmd.c
index 00fd638c..ca513cec 100644
--- a/armsrc/mifarecmd.c
+++ b/armsrc/mifarecmd.c
@@ -20,6 +20,9 @@
 #include "parity.h"
 #include "crc.h"
 
+#define HARDNESTED_AUTHENTICATION_TIMEOUT 848			// card times out 1ms after wrong authentication (according to NXP documentation)
+#define HARDNESTED_PRE_AUTHENTICATION_LEADTIME 400		// some (non standard) cards need a pause after select before they are ready for first authentication 
+
 // the block number for the ISO14443-4 PCB
 static uint8_t pcb_blocknum = 0;
 // Deselect card by sending a s-block. the crc is precalced for speed
@@ -677,7 +680,7 @@ void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags,
 		}
 
 		if (slow) {
-			timeout = GetCountSspClk() + PRE_AUTHENTICATION_LEADTIME;
+			timeout = GetCountSspClk() + HARDNESTED_PRE_AUTHENTICATION_LEADTIME;
 			while(GetCountSspClk() < timeout);
 		}
 
@@ -694,11 +697,12 @@ void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags,
 			continue;
 		}
 
-		// send a dummy byte as reader response in order to trigger the cards authentication timeout
-		uint8_t dummy_answer = 0;
-		ReaderTransmit(&dummy_answer, 1, NULL);
-		timeout = GetCountSspClk() + AUTHENTICATION_TIMEOUT;
+		// send an incomplete dummy response in order to trigger the card's authentication failure timeout
+		uint8_t dummy_answer[1] = {0};
+		ReaderTransmit(dummy_answer, 1, NULL);
 
+		timeout = GetCountSspClk() + HARDNESTED_AUTHENTICATION_TIMEOUT;
+		
 		num_nonces++;
 		if (num_nonces % 2) {
 			memcpy(buf+i, receivedAnswer, 4);
@@ -1145,7 +1149,7 @@ static bool isBlockTrailer(int blockN) {
 	if (blockN >= 128 && blockN <= 256) {
 		return ((blockN & 0x0F) == 0x0F);
 	}
-	return FALSE;
+	return false;
 }
 
 void MifareCWipe(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){