X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3ad48540d4d77f50cc62d16acb78f17019ef431d..2b61c242127b54c6f8a92bf6991cdf9bd9aa27af:/client/loclass/cipher.c

diff --git a/client/loclass/cipher.c b/client/loclass/cipher.c
index aefb5df5..9c1c2cfd 100644
--- a/client/loclass/cipher.c
+++ b/client/loclass/cipher.c
@@ -1,5 +1,17 @@
 /*****************************************************************************
- * This file is part of iClassCipher. It is a reconstructon of the cipher engine
+ * WARNING
+ *
+ * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY. 
+ * 
+ * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL 
+ * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL, 
+ * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES. 
+ * 
+ * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS. 
+ *
+ *****************************************************************************
+ *
+ * This file is part of loclass. It is a reconstructon of the cipher engine
  * used in iClass, and RFID techology.
  *
  * The implementation is based on the work performed by
@@ -18,9 +30,13 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with IClassCipher.  If not, see <http://www.gnu.org/licenses/>.
+ * along with loclass.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ * 
+ * 
  ****************************************************************************/
 
+
 #include "cipher.h"
 #include "cipherutils.h"
 #include <stdio.h>
@@ -203,22 +219,27 @@ void MAC(uint8_t* k, BitstreamIn input, BitstreamOut out)
 	BitstreamIn input_32_zeroes = {zeroes_32,sizeof(zeroes_32)*8,0};
 	State initState = suc(k,init(k),&input);
 	output(k,initState,&input_32_zeroes,&out);
-}
+}	 
 
-void doMAC(uint8_t cc_nr[12],uint8_t div_key[8], uint8_t mac[4])
+void doMAC(uint8_t *cc_nr_p, int length, uint8_t *div_key_p, uint8_t mac[4])
 {
-	// Reversed "on-the-wire" data
-	uint8_t cc_nr_r[12]  = {0};
-	reverse_arraycopy(cc_nr, cc_nr_r,12);
-	BitstreamIn bitstream = {cc_nr_r,12 * 8,0};
-	uint8_t dest [8]= {0,0,0,0,0,0,0,0};
+    uint8_t *cc_nr;
+    uint8_t div_key[8];
+    cc_nr=(uint8_t*)malloc(length+1);
+    memcpy(cc_nr,cc_nr_p,length);
+    memcpy(div_key,div_key_p,8);
+    
+	reverse_arraybytes(cc_nr,length);
+	BitstreamIn bitstream = {cc_nr,length * 8,0};
+	uint8_t dest []= {0,0,0,0,0,0,0,0};
 	BitstreamOut out = { dest, sizeof(dest)*8, 0 };
 	MAC(div_key,bitstream, out);
-
 	//The output MAC must also be reversed
 	reverse_arraybytes(dest, sizeof(dest));
-	memcpy(mac, dest, 4);
-	return;
+	memcpy(mac,dest,4);
+    //printf("Calculated_MAC\t%02x%02x%02x%02x\n", dest[0],dest[1],dest[2],dest[3]);
+	free(cc_nr);
+    return;
 }
 
 int testMAC()
@@ -232,7 +253,7 @@ int testMAC()
 	uint8_t correct_MAC[4] = {0x1d,0x49,0xC9,0xDA};
 
 	uint8_t calculated_mac[4] = {0};
-	doMAC(cc_nr, div_key, calculated_mac);
+    doMAC(cc_nr, 12,div_key, calculated_mac);
 
 	if(memcmp(calculated_mac, correct_MAC,4) == 0)
 	{
@@ -243,8 +264,8 @@ int testMAC()
 		prnlog("[+] FAILED: MAC calculation failed:");
 		printarr("    Calculated_MAC", calculated_mac, 4);
 		printarr("    Correct_MAC   ", correct_MAC, 4);
-		return 1;
-	}
+	return 1;
+}
 
 	return 0;
 }