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device side mac

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iceman1001 2020-07-29 10:52:39 +02:00
commit b0ffc90c16
2 changed files with 21 additions and 1 deletions
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20
armsrc/optimized_cipher.c
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@ -249,12 +249,32 @@ static void opt_MAC(uint8_t *k, uint8_t *input, uint8_t *out) {
opt_output(k, &_init, out);
}
static void opt_MAC_N(uint8_t *k, uint8_t *input, uint8_t in_size, uint8_t *out) {
State _init = {
((k[0] ^ 0x4c) + 0xEC) & 0xFF,// l
((k[0] ^ 0x4c) + 0x21) & 0xFF,// r
0x4c, // b
0xE012 // t
};
opt_suc(k, &_init, input, in_size, false);
opt_output(k, &_init, out);
}
void opt_doReaderMAC(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t mac[4]) {
uint8_t dest [] = {0, 0, 0, 0, 0, 0, 0, 0};
opt_MAC(div_key_p, cc_nr_p, dest);
memcpy(mac, dest, 4);
}
void doMAC_N(uint8_t *in_p, uint8_t in_size, uint8_t *div_key_p, uint8_t mac[4]) {
uint8_t dest [] = {0, 0, 0, 0, 0, 0, 0, 0};
opt_MAC_N(div_key_p, in_p, in_size, dest);
memcpy(mac, dest, 4);
}
void opt_doTagMAC(uint8_t *cc_p, const uint8_t *div_key_p, uint8_t mac[4]) {
State _init = {
((div_key_p[0] ^ 0x4c) + 0xEC) & 0xFF,// l

2
armsrc/optimized_cipher.h
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@ -46,6 +46,6 @@ State opt_doTagMAC_1(uint8_t *cc_p, const uint8_t *div_key_p);
*/
void opt_doTagMAC_2(State _init, uint8_t *nr, uint8_t mac[4], const uint8_t *div_key_p);
void doMAC_N(uint8_t *in_p, uint8_t in_size, uint8_t *div_key_p, uint8_t mac[4]);
void iclass_calc_div_key(uint8_t *csn, uint8_t *key, uint8_t *div_key, bool elite);
#endif // OPTIMIZED_CIPHER_H