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readermac

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This commit is contained in:
iceman1001 2020-08-13 10:13:16 +02:00
parent 85fd28eb2c
commit 339e598039
2 changed files with 9 additions and 2 deletions
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8
armsrc/optimized_cipher.c
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@ -267,14 +267,18 @@ void opt_doReaderMAC(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t mac[4]) {
memcpy(mac, dest, 4);
}
void opt_doReaderMAC_2(State _init, uint8_t *nr, uint8_t mac[4], const uint8_t *div_key_p) {
opt_suc(div_key_p, &_init, nr, 4, false);
opt_output(div_key_p, &_init, mac);
}
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

3
armsrc/optimized_cipher.h
View file

@ -21,6 +21,9 @@ typedef struct {
/** The reader MAC is MAC(key, CC * NR )
**/
void opt_doReaderMAC(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t mac[4]);
void opt_doReaderMAC_2(State _init, uint8_t *nr, uint8_t mac[4], const uint8_t *div_key_p);
/**
* The tag MAC is MAC(key, CC * NR * 32x0))
*/