Code improved for less memory

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

diff --git a/client/loclass/cipher.c b/client/loclass/cipher.c
index 2aae093debc9150d99ab0a5c8fe2c7c36864b080..3b146b109b520fc05eec44c4d06aaffdfdee2205 100644 (file)
--- a/client/loclass/cipher.c
+++ b/client/loclass/cipher.c
@@ -22,7 +22,7 @@
  *
  * This is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
+ * by the Free Software Foundation, or, at your option, any later version. 
  *
  * This file is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -33,7 +33,6 @@
  * along with loclass.  If not, see <http://www.gnu.org/licenses/>.
  * 
  * 
- * 
  ****************************************************************************/
 
 
@@ -114,9 +113,9 @@ uint8_t _select(bool x, bool y, uint8_t r)
        bool r6 = r >> 1 & 0x1;
        bool r7 = r & 0x1;
 
-       bool z0 = (r0 & r2) ^ (r1 & ~r3) ^ (r2 | r4);
+       bool z0 = (r0 & r2) ^ (r1 & !r3) ^ (r2 | r4);
        bool z1 = (r0 | r2) ^ ( r5 | r7) ^ r1 ^ r6 ^ x ^ y;
-       bool z2 = (r3 & ~r5) ^ (r4 & r6 ) ^ r7 ^ x;
+       bool z2 = (r3 & !r5) ^ (r4 & r6 ) ^ r7 ^ x;
 
        // The three bitz z0.. z1 are packed into a uint8_t:
        // 00000ZZZ
@@ -224,42 +223,42 @@ void MAC(uint8_t* k, BitstreamIn input, BitstreamOut out)
 void doMAC(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t mac[4])
 {
        uint8_t cc_nr[13] = { 0 };
-    uint8_t div_key[8];
+       uint8_t div_key[8];
        //cc_nr=(uint8_t*)malloc(length+1);
 
-       memcpy(cc_nr,cc_nr_p,12);
-    memcpy(div_key,div_key_p,8);
+       memcpy(cc_nr, cc_nr_p, 12);
+       memcpy(div_key, div_key_p, 8);
 
        reverse_arraybytes(cc_nr,12);
-       BitstreamIn bitstream = {cc_nr,12 * 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);
+       BitstreamIn bitstream = {cc_nr, 12 * 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);
        //free(cc_nr);
-    return;
+       return;
 }
-void doMAC_N(uint8_t *cc_nr_p,uint8_t cc_nr_size, uint8_t *div_key_p, uint8_t mac[4])
+void doMAC_N(uint8_t *address_data_p, uint8_t address_data_size, uint8_t *div_key_p, uint8_t mac[4])
 {
-    uint8_t *cc_nr;
-    uint8_t div_key[8];
-    cc_nr = (uint8_t*) malloc(cc_nr_size);
-    
-    memcpy(cc_nr,cc_nr_p,cc_nr_size);
-    memcpy(div_key,div_key_p,8);
-    
-    reverse_arraybytes(cc_nr,cc_nr_size);
-    BitstreamIn bitstream = {cc_nr,cc_nr_size * 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);
-    free(cc_nr);
-    return;
+       uint8_t *address_data;
+       uint8_t div_key[8];
+       address_data = (uint8_t*) malloc(address_data_size);
+
+       memcpy(address_data, address_data_p, address_data_size);
+       memcpy(div_key, div_key_p, 8);
+
+       reverse_arraybytes(address_data, address_data_size);
+       BitstreamIn bitstream = {address_data, address_data_size * 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);
+       free(address_data);
+       return;
 }
 
 #ifndef ON_DEVICE