chg: trying to generalize the EMV build

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

diff --git a/client/loclass/elite_crack.c b/client/loclass/elite_crack.c
index 29b7f04d4f3dec2ec1dc1316ae28a185dad0775d..ebe82297c24407069893545b54efcfacb5b41289 100644 (file)
--- a/client/loclass/elite_crack.c
+++ b/client/loclass/elite_crack.c
@@ -154,9 +154,15 @@ void hash1(uint8_t csn[] , uint8_t k[])
        k[5] = ~rl( csn[5]+k[3] )+1;
        k[6] = rr( csn[6]+(k[4]^0x3c) );
        k[7] = rl( csn[7]+(k[5]^0xc3) );
-       int i;
-       for(i = 7; i >=0; i--)
-               k[i] = k[i] & 0x7F;
+       
+       k[7] &= 0x7F;
+       k[6] &= 0x7F;
+       k[5] &= 0x7F;
+       k[4] &= 0x7F;
+       k[3] &= 0x7F;
+       k[2] &= 0x7F;
+       k[1] &= 0x7F;
+       k[0] &= 0x7F;
 }
 /**
 Definition 14. Define the rotate key function rk : (F 82 ) 8 × N → (F 82 ) 8 as
@@ -165,15 +171,12 @@ rk(x [0] . . . x [7] , n + 1) = rk(rl(x [0] ) . . . rl(x [7] ), n)
 **/
 void rk(uint8_t *key, uint8_t n, uint8_t *outp_key)
 {
-
     memcpy(outp_key, key, 8);
-
     uint8_t j;
-
-    while(n-- > 0)
+    while(n-- > 0) {
         for(j=0; j < 8 ; j++)
             outp_key[j] = rl(outp_key[j]);
-
+       }
     return;
 }
 
@@ -222,9 +225,9 @@ void hash2(uint8_t *key64, uint8_t *outp_keytable)
     uint8_t temp_output[8]={0};
     //calculate complement of key
     int i;
-    for(i=0;i<8;i++)
+    for (i=0; i<8; i++)
         key64_negated[i]= ~key64[i];
-
+       
     // Once again, key is on iclass-format
     desencrypt_iclass(key64, key64_negated, z[0]);
 
@@ -238,26 +241,21 @@ void hash2(uint8_t *key64, uint8_t *outp_keytable)
     desdecrypt_iclass(z[0], key64_negated, y[0]);
     printvar("y0  ",  y[0],8);
 
-    for(i=1; i<8; i++)
-    {
-
+    for (i=1; i<8; i++) {
         // z [i] = DES dec (rk(K cus , i), z [i−1] )
         rk(key64, i, temp_output);
         //y [i] = DES enc (rk(K cus , i), y [i−1] )
 
         desdecrypt_iclass(temp_output,z[i-1], z[i]);
         desencrypt_iclass(temp_output,y[i-1], y[i]);
-
     }
-    if(outp_keytable != NULL)
-    {
-        for(i = 0 ; i < 8 ; i++)
-        {
+
+    if (outp_keytable != NULL) {
+        for(i = 0 ; i < 8 ; i++) {
             memcpy(outp_keytable+i*16,y[i],8);
             memcpy(outp_keytable+8+i*16,z[i],8);
         }
-    }else
-    {
+    } else {
         printarr_human_readable("hash2", outp_keytable,128);
     }
 }
@@ -283,6 +281,7 @@ int _readFromDump(uint8_t dump[], dumpdata* item, uint8_t i)
        size_t itemsize = sizeof(dumpdata);
        //dumpdata item =  {0};
        memcpy(item,dump+i*itemsize, itemsize);
+
        if(true)
        {
                printvar("csn", item->csn,8);
@@ -317,7 +316,6 @@ int bruteforceItem(dumpdata item, uint16_t keytable[])
        uint8_t key_index[8] = {0};
        hash1(item.csn, key_index);
 
-
        /*
         * Determine which bytes to retrieve. A hash is typically
         * 01010000454501
@@ -333,23 +331,21 @@ int bruteforceItem(dumpdata item, uint16_t keytable[])
        uint8_t bytes_to_recover[3] = {0};
        uint8_t numbytes_to_recover = 0 ;
        int i;
-       for(i =0 ; i < 8 ; i++)
-       {
-               if(keytable[key_index[i]] & (CRACKED | BEING_CRACKED)) continue;
+       for (i=0; i<8; i++)     {
+               if (keytable[key_index[i]] & (CRACKED | BEING_CRACKED)) continue;
+               
                bytes_to_recover[numbytes_to_recover++] = key_index[i];
                keytable[key_index[i]] |= BEING_CRACKED;
 
-               if(numbytes_to_recover > 3)
-               {
+               if (numbytes_to_recover > 3) {
                        prnlog("The CSN requires > 3 byte bruteforce, not supported");
-                       printvar("CSN", item.csn,8);
-                       printvar("HASH1", key_index,8);
+                       printvar("CSN", item.csn, 8);
+                       printvar("HASH1", key_index, 8);
 
                        //Before we exit, reset the 'BEING_CRACKED' to zero
                        keytable[bytes_to_recover[0]]  &= ~BEING_CRACKED;
                        keytable[bytes_to_recover[1]]  &= ~BEING_CRACKED;
                        keytable[bytes_to_recover[2]]  &= ~BEING_CRACKED;
-
                        return 1;
                }
        }
@@ -373,61 +369,57 @@ int bruteforceItem(dumpdata item, uint16_t keytable[])
 
        while(!found && !(brute & endmask))
        {
-
                //Update the keytable with the brute-values
-               for(i =0 ; i < numbytes_to_recover; i++)
-               {
+               for (i=0; i < numbytes_to_recover; i++) {
                        keytable[bytes_to_recover[i]] &= 0xFF00;
                        keytable[bytes_to_recover[i]] |= (brute >> (i*8) & 0xFF);
                }
 
                // Piece together the key
-               key_sel[0] = keytable[key_index[0]] & 0xFF;key_sel[1] = keytable[key_index[1]] & 0xFF;
-               key_sel[2] = keytable[key_index[2]] & 0xFF;key_sel[3] = keytable[key_index[3]] & 0xFF;
-               key_sel[4] = keytable[key_index[4]] & 0xFF;key_sel[5] = keytable[key_index[5]] & 0xFF;
-               key_sel[6] = keytable[key_index[6]] & 0xFF;key_sel[7] = keytable[key_index[7]] & 0xFF;
+               key_sel[0] = keytable[key_index[0]] & 0xFF;
+               key_sel[1] = keytable[key_index[1]] & 0xFF;
+               key_sel[2] = keytable[key_index[2]] & 0xFF;
+               key_sel[3] = keytable[key_index[3]] & 0xFF;
+               key_sel[4] = keytable[key_index[4]] & 0xFF;
+               key_sel[5] = keytable[key_index[5]] & 0xFF;
+               key_sel[6] = keytable[key_index[6]] & 0xFF;
+               key_sel[7] = keytable[key_index[7]] & 0xFF;
 
                //Permute from iclass format to standard format
-               permutekey_rev(key_sel,key_sel_p);
+               permutekey_rev(key_sel, key_sel_p);
                //Diversify
                diversifyKey(item.csn, key_sel_p, div_key);
                //Calc mac
-               doMAC(item.cc_nr, div_key,calculated_MAC);
+               doMAC(item.cc_nr, div_key, calculated_MAC);
 
-               if(memcmp(calculated_MAC, item.mac, 4) == 0)
-               {
+               if(memcmp(calculated_MAC, item.mac, 4) == 0) {
                        for(i =0 ; i < numbytes_to_recover; i++)
                                prnlog("=> %d: 0x%02x", bytes_to_recover[i],0xFF & keytable[bytes_to_recover[i]]);
                        found = true;
                        break;
                }
+               
                brute++;
-               if((brute & 0xFFFF) == 0)
-               {
+               if ((brute & 0xFFFF) == 0) {
                        printf("%d",(brute >> 16) & 0xFF);
                        fflush(stdout);
                }
        }
-       if(! found)
-       {
+       if (!found) {
                prnlog("Failed to recover %d bytes using the following CSN",numbytes_to_recover);
                printvar("CSN",item.csn,8);
                errors++;
+
                //Before we exit, reset the 'BEING_CRACKED' to zero
-               for(i =0 ; i < numbytes_to_recover; i++)
-               {
+               for (i=0; i < numbytes_to_recover; i++){
                        keytable[bytes_to_recover[i]]  &= 0xFF;
                        keytable[bytes_to_recover[i]]  |= CRACK_FAILED;
                }
-
-       }else
-       {
-               for(i =0 ; i < numbytes_to_recover; i++)
-               {
+       } else {
+               for (i=0; i < numbytes_to_recover; i++){
                        keytable[bytes_to_recover[i]]  &= 0xFF;
                        keytable[bytes_to_recover[i]]  |= CRACKED;
                }
-
        }
        return errors;
 }
@@ -551,7 +543,7 @@ int bruteforceDump(uint8_t dump[], size_t dumpsize, uint16_t keytable[])
 int bruteforceFile(const char *filename, uint16_t keytable[])
 {
        FILE *f = fopen(filename, "rb");
-       if(!f) {
+       if (!f) {
                prnlog("Failed to read from file '%s'", filename);
                return 1;
        }
@@ -562,20 +554,15 @@ int bruteforceFile(const char *filename, uint16_t keytable[])
 
        if (fsize < 0) {
                prnlog("Error, when getting filesize");
-               if (f) {
-                       fclose(f);
-                       f = NULL;
-               }
+               if (f) fclose(f);
                return 1;
        }
 
        uint8_t *dump = malloc(fsize);
        size_t bytes_read = fread(dump, 1, fsize, f);
 
-       if (f) {
-               fclose(f);
-               f = NULL;
-       }
+       if (f) fclose(f);
+       
     if (bytes_read < fsize) {
         prnlog("Error, could only read %d bytes (should be %d)",bytes_read, fsize );
     }
@@ -627,14 +614,13 @@ int _testBruteforce()
                uint16_t keytable[128] = {0};
 
                //Test a few variants
-               if(fileExists("iclass_dump.bin"))
-               {
+               if (fileExists("iclass_dump.bin")){
                        errors |= bruteforceFile("iclass_dump.bin",keytable);
-               }else if(fileExists("loclass/iclass_dump.bin")){
+               } else if (fileExists("loclass/iclass_dump.bin")){
                        errors |= bruteforceFile("loclass/iclass_dump.bin",keytable);
-               }else if(fileExists("client/loclass/iclass_dump.bin")){
+               } else if (fileExists("client/loclass/iclass_dump.bin")){
                        errors |= bruteforceFile("client/loclass/iclass_dump.bin",keytable);
-               }else{
+               } else {
                        prnlog("Error: The file iclass_dump.bin was not found!");
                }
        }
@@ -650,7 +636,6 @@ int _test_iclass_key_permutation()
        permutekey(testcase, testcase_output);
        permutekey_rev(testcase_output, testcase_output_rev);
 
-
        if(memcmp(testcase_output, testcase_output_correct,8) != 0)
        {
                prnlog("Error with iclass key permute!");