X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a66fca86b9f81e07161e89c101338968eda9d6c5..9a9bcea82baed04c6986d02f671b836e2875dc79:/client/loclass/cipher.c
diff --git a/client/loclass/cipher.c b/client/loclass/cipher.c
index d7c9abda..1a774568 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
@@ -18,20 +30,39 @@
* 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 .
+ * along with loclass. If not, see .
+ *
+ *
+ *
****************************************************************************/
+
+#include "cipher.h"
+#include "cipherutils.h"
#include
#include
#include
#include
#include
-#include "loclass/cipher.h"
-#include "loclass/cipherutils.h"
-#include "loclass/ikeys.h"
-
+#include
+//#include "fileutils.h"
uint8_t keytable[] = { 0,0,0,0,0,0,0,0};
+/**
+* Definition 1 (Cipher state). A cipher state of iClass s is an element of F 40/2
+* consisting of the following four components:
+* 1. the left register l = (l 0 . . . l 7 ) â F 8/2 ;
+* 2. the right register r = (r 0 . . . r 7 ) â F 8/2 ;
+* 3. the top register t = (t 0 . . . t 15 ) â F 16/2 .
+* 4. the bottom register b = (b 0 . . . b 7 ) â F 8/2 .
+**/
+typedef struct {
+ uint8_t l;
+ uint8_t r;
+ uint8_t b;
+ uint16_t t;
+} State;
+
/**
* Definition 2. The feedback function for the top register T : F 16/2 â F 2
* is defined as
@@ -160,8 +191,6 @@ void output(uint8_t* k,State s, BitstreamIn* in, BitstreamOut* out)
{
return;
}
- //printf("bitsleft %d" , bitsLeft(in));
- //printf(" %0d", s.r >> 2 & 1);
pushBit(out,(s.r >> 2) & 1);
//Remove first bit
uint8_t x0 = headBit(in);
@@ -190,71 +219,53 @@ 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 printarr(char * name, uint8_t* arr, int len)
+void doMAC(uint8_t *cc_nr_p, int length, uint8_t *div_key_p, uint8_t mac[4])
{
- int i ;
- printf("uint8_t %s[] = {", name);
- for(i =0 ; i< len ; i++)
- {
- printf("0x%02x,",*(arr+i));
- }
- printf("};\n");
+ 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);
+ //printf("Calculated_MAC\t%02x%02x%02x%02x\n", dest[0],dest[1],dest[2],dest[3]);
+ free(cc_nr);
+ return;
}
int testMAC()
{
+ prnlog("[+] Testing MAC calculation...");
//From the "dismantling.IClass" paper:
uint8_t cc_nr[] = {0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0,0,0,0};
- // But actually, that must be reversed, it's "on-the-wire" data
- reverse_arraybytes(cc_nr,sizeof(cc_nr));
-
//From the paper
- uint8_t div_key[] = {0xE0,0x33,0xCA,0x41,0x9A,0xEE,0x43,0xF9};
- uint8_t correct_MAC[] = {0x1d,0x49,0xC9,0xDA};
+ uint8_t div_key[8] = {0xE0,0x33,0xCA,0x41,0x9A,0xEE,0x43,0xF9};
+ uint8_t correct_MAC[4] = {0x1d,0x49,0xC9,0xDA};
- BitstreamIn bitstream = {cc_nr,sizeof(cc_nr) * 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));
+ uint8_t calculated_mac[4] = {0};
+ doMAC(cc_nr, 12,div_key, calculated_mac);
- if(false && memcmp(dest, correct_MAC,4) == 0)
+ if(memcmp(calculated_mac, correct_MAC,4) == 0)
{
- printf("MAC calculation OK!\n");
+ prnlog("[+] MAC calculation OK!");
}else
{
- printf("MAC calculation failed\n");
- printarr("Calculated_MAC", dest, 4);
- printarr("Correct_MAC ", correct_MAC, 4);
+ prnlog("[+] FAILED: MAC calculation failed:");
+ printarr(" Calculated_MAC", calculated_mac, 4);
+ printarr(" Correct_MAC ", correct_MAC, 4);
return 1;
}
+
return 0;
}
-
-int calc_iclass_mac(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t *mac)
-{
- uint8_t cc_nr[12];
- uint8_t div_key[8];
- memcpy(cc_nr,cc_nr_p,12);
- memcpy(div_key,div_key_p,8);
-
- reverse_arraybytes(cc_nr,sizeof(cc_nr));
- BitstreamIn bitstream = {cc_nr,sizeof(cc_nr) * 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));
-
- printf("Calculated_MAC\t%02x%02x%02x%02x\n", dest[0],dest[1],dest[2],dest[3]);
- memcpy(mac,dest,4);
-
- return 1;
-}
\ No newline at end of file