Updated the README.txt

[proxmark3-svn] / client / loclass / cipher.c

diff --git a/client/loclass/cipher.c b/client/loclass/cipher.c
index 463ba9be81af08da5d0abc3030feb7d2801a80ab..9c1c2cfd4cbd63c09d6c1b6fa7d11049922c9bb1 100644 (file)
--- 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>
@@ -203,7 +219,7 @@ 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_p, int length, uint8_t *div_key_p, uint8_t mac[4])
 {
@@ -212,17 +228,17 @@ void doMAC(uint8_t *cc_nr_p, int length, uint8_t *div_key_p, uint8_t mac[4])
     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);
+    
+       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);
     //printf("Calculated_MAC\t%02x%02x%02x%02x\n", dest[0],dest[1],dest[2],dest[3]);
-    free(cc_nr);
+       free(cc_nr);
     return;
 }
 
@@ -248,8 +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;
 }