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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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13
client/loclass/cipher.c
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@ -238,15 +238,16 @@ int testMAC()
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];
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);
reverse_arraybytes(cc_nr,sizeof(cc_nr));
BitstreamIn bitstream = {cc_nr,sizeof(cc_nr) * 8,0};
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);
@ -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]);
memcpy(mac,dest,4);
free(cc_nr);
return 1;
}

2
client/loclass/cipher.h
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@ -41,6 +41,6 @@ typedef struct {
} State;
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