*/
void permutekey(uint8_t key[8], uint8_t dest[8])
{
-
int i;
for(i = 0 ; i < 8 ; i++)
{
(((key[1] & (0x80 >> i)) >> (7-i)) << 1) |
(((key[0] & (0x80 >> i)) >> (7-i)) << 0);
}
-
return;
}
/**
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 Ć N ā (F 82 ) 8 as
**/
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;
}
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]);
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 [iā1] )
rk(key64, i, temp_output);
//y [i] = DES enc (rk(K cus , i), y [iā1] )
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);
}
}
size_t itemsize = sizeof(dumpdata);
//dumpdata item = {0};
memcpy(item,dump+i*itemsize, itemsize);
+
if(true)
{
printvar("csn", item->csn,8);
uint8_t key_index[8] = {0};
hash1(item.csn, key_index);
-
/*
* Determine which bytes to retrieve. A hash is typically
* 01010000454501
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;
}
}
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;
}
errors += bruteforceItem(*attack, keytable);
}
free(attack);
- clock_t t2 = clock();
- float diff = (((float)t2 - (float)t1) / CLOCKS_PER_SEC );
+ t1 = clock() - t1;
+ float diff = ((float)t1 / CLOCKS_PER_SEC );
prnlog("\nPerformed full crack in %f seconds",diff);
// Pick out the first 16 bytes of the 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;
}
long fsize = ftell(f);
fseek(f, 0, SEEK_SET);
+ if (fsize < 0) {
+ prnlog("Error, when getting filesize");
+ if (f) fclose(f);
+ return 1;
+ }
+
uint8_t *dump = malloc(fsize);
size_t bytes_read = fread(dump, 1, fsize, f);
- fclose(f);
- if (bytes_read < fsize)
- {
+ if (f) fclose(f);
+
+ if (bytes_read < fsize) {
prnlog("Error, could only read %d bytes (should be %d)",bytes_read, fsize );
}
- return bruteforceDump(dump,fsize,keytable);
+ uint8_t res = bruteforceDump(dump,fsize,keytable);
+ free(dump);
+ return res;
}
/**
*
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!");
}
}
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!");
projects / proxmark3-svn / blobdiff