X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a66fca86b9f81e07161e89c101338968eda9d6c5..3400a4358db11337382065c26e58539d28ade5ef:/client/loclass/cipher.c

diff --git a/client/loclass/cipher.c b/client/loclass/cipher.c
index d7c9abda..463ba9be 100644
--- a/client/loclass/cipher.c
+++ b/client/loclass/cipher.c
@@ -21,17 +21,32 @@
  * along with IClassCipher.  If not, see <http://www.gnu.org/licenses/>.
  ****************************************************************************/
 
+#include "cipher.h"
+#include "cipherutils.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 #include <stdint.h>
-#include "loclass/cipher.h"
-#include "loclass/cipherutils.h"
-#include "loclass/ikeys.h"
-
+#include <time.h>
+#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 ) ∈ F 8/2 ;
+* 	2. the right register r = (r 0 . . . r 7 ) ∈ F 8/2 ;
+* 	3. the top register t = (t 0 . . . t 15 ) ∈ F 16/2 .
+* 	4. the bottom register b = (b 0 . . . b 7 ) ∈ 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 → F 2
 *	is defined as
@@ -160,8 +175,6 @@ 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 +203,53 @@ 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