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improved calc_iclass_mac to work independant of size

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penturalabs 2014-05-02 23:30:03 +01:00
commit fe53c0311c
3 changed files with 9 additions and 8 deletions
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2
client/cmdhficlass.c
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@ -308,7 +308,7 @@ int CmdHFiClassReader_Dump(const char *Cmd)
hash0(crypted_id,div_key); hash0(crypted_id,div_key);
//memcpy(div_key,result,8); //memcpy(div_key,result,8);
PrintAndLog("Div Key: %s",sprint_hex(div_key,8)); PrintAndLog("Div Key: %s",sprint_hex(div_key,8));
calc_iclass_mac(CCNR,div_key,MAC); calc_iclass_mac(CCNR,12,div_key,MAC);
UsbCommand c = {CMD_READER_ICLASS_REPLAY, {readerType}}; UsbCommand c = {CMD_READER_ICLASS_REPLAY, {readerType}};
memcpy(c.d.asBytes, MAC, 4); memcpy(c.d.asBytes, MAC, 4);

13
client/loclass/cipher.c
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@ -238,15 +238,16 @@ int testMAC()
return 0; return 0;
} }
int calc_iclass_mac(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t *mac) int calc_iclass_mac(uint8_t *cc_nr_p, int length, uint8_t *div_key_p, uint8_t *mac)
{ {
uint8_t cc_nr[12]; uint8_t *cc_nr;
uint8_t div_key[8]; uint8_t div_key[8];
memcpy(cc_nr,cc_nr_p,12); cc_nr=(uint8_t*)malloc(length+1);
memcpy(cc_nr,cc_nr_p,length);
memcpy(div_key,div_key_p,8); memcpy(div_key,div_key_p,8);
reverse_arraybytes(cc_nr,sizeof(cc_nr)); reverse_arraybytes(cc_nr,length);
BitstreamIn bitstream = {cc_nr,sizeof(cc_nr) * 8,0}; BitstreamIn bitstream = {cc_nr,length * 8,0};
uint8_t dest []= {0,0,0,0,0,0,0,0}; uint8_t dest []= {0,0,0,0,0,0,0,0};
BitstreamOut out = { dest, sizeof(dest)*8, 0 }; BitstreamOut out = { dest, sizeof(dest)*8, 0 };
MAC(div_key,bitstream, out); MAC(div_key,bitstream, out);
@ -255,6 +256,6 @@ int calc_iclass_mac(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t *mac)
printf("Calculated_MAC\t%02x%02x%02x%02x\n", dest[0],dest[1],dest[2],dest[3]); printf("Calculated_MAC\t%02x%02x%02x%02x\n", dest[0],dest[1],dest[2],dest[3]);
memcpy(mac,dest,4); memcpy(mac,dest,4);
free(cc_nr);
return 1; return 1;
} }

2
client/loclass/cipher.h
View file

@ -41,6 +41,6 @@ typedef struct {
} State; } State;
void printarr(char * name, uint8_t* arr, int len); void printarr(char * name, uint8_t* arr, int len);
int calc_iclass_mac(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t *mac); int calc_iclass_mac(uint8_t *cc_nr_p, int length, uint8_t *div_key_p, uint8_t *mac);
#endif // CIPHER_H #endif // CIPHER_H