mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-12-30 20:23:46 +08:00
57778a4630
CHG: defines on armside CHG: #define WIN32 -> _WIN32 CHG: started to enhance "hf mf chkkeys" REM: removed some duplicates etc in default keys.
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
#ifndef OPTIMIZED_CIPHER_H
|
|
#define OPTIMIZED_CIPHER_H
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
#include <stdbool.h>
|
|
|
|
/**
|
|
* Definition 1 (Cipher state). A cipher state of iClass s is an element of F 40/2
|
|
* consisting of the following four components:
|
|
* 1. the left register l = (l 0 . . . l 7 ) ∈ F 8/2 ;
|
|
* 2. the right register r = (r 0 . . . r 7 ) ∈ F 8/2 ;
|
|
* 3. the top register t = (t 0 . . . t 15 ) ∈ F 16/2 .
|
|
* 4. the bottom register b = (b 0 . . . b 7 ) ∈ F 8/2 .
|
|
**/
|
|
typedef struct {
|
|
uint8_t l;
|
|
uint8_t r;
|
|
uint8_t b;
|
|
uint16_t t;
|
|
} State;
|
|
|
|
/** 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]);
|
|
/**
|
|
* The tag MAC is MAC(key, CC * NR * 32x0))
|
|
*/
|
|
void opt_doTagMAC(uint8_t *cc_p, const uint8_t *div_key_p, uint8_t mac[4]);
|
|
|
|
/**
|
|
* The tag MAC can be divided (both can, but no point in dividing the reader mac) into
|
|
* two functions, since the first 8 bytes are known, we can pre-calculate the state
|
|
* reached after feeding CC to the cipher.
|
|
* @param cc_p
|
|
* @param div_key_p
|
|
* @return the cipher state
|
|
*/
|
|
State opt_doTagMAC_1(uint8_t *cc_p, const uint8_t *div_key_p);
|
|
/**
|
|
* The second part of the tag MAC calculation, since the CC is already calculated into the state,
|
|
* this function is fed only the NR, and internally feeds the remaining 32 0-bits to generate the tag
|
|
* MAC response.
|
|
* @param _init - precalculated cipher state
|
|
* @param nr - the reader challenge
|
|
* @param mac - where to store the MAC
|
|
* @param div_key_p - the key to use
|
|
*/
|
|
void opt_doTagMAC_2(State _init, uint8_t* nr, uint8_t mac[4], const uint8_t* div_key_p);
|
|
|
|
#endif // OPTIMIZED_CIPHER_H
|