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Ndef and MAD (#801)

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* move mifare stuff to separate folder
* add mad and ndef
This commit is contained in:
Oleg Moiseenko 2019-03-19 08:51:10 +02:00 • committed by pwpiwi
parent 3d057cfb91
commit fdd9395d1a
27 changed files with 2843 additions and 1588 deletions
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24
common/crc.c
View file

@ -9,6 +9,20 @@
#include <stdint.h>
#include <stddef.h>
#define BITMASK(X) (1 << (X))
uint32_t reflect(uint32_t v, int b) {
uint32_t t = v;
for (int i = 0; i < b; ++i) {
if (t & 1)
v |= BITMASK((b - 1) - i);
else
v &= ~BITMASK((b - 1) - i);
t >>= 1;
}
return v;
}
void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor)
{
crc->order = order;
@ -54,3 +68,13 @@ uint32_t CRC8Maxim(uint8_t *buff, size_t size)
}
return crc_finish(&crc);
}
// width=8 poly=0x1d, init=0xc7 (0xe3 - WRONG! but it mentioned in MAD datasheet) refin=false refout=false xorout=0x00 name="CRC-8/MIFARE-MAD"
uint32_t CRC8Mad(uint8_t *buff, size_t size) {
crc_t crc;
crc_init(&crc, 8, reflect(0x1d, 8), reflect(0xc7, 8), 0);
for (int i = 0; i < size; ++i)
crc_update(&crc, reflect(buff[i], 8), 8);
return reflect(crc_finish(&crc), 8);
}

5
common/crc.h
View file

@ -11,6 +11,7 @@
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
typedef struct crc {
uint32_t state;
@ -39,6 +40,10 @@ extern uint32_t crc_finish(crc_t *crc);
// Calculate CRC-8/Maxim checksum
uint32_t CRC8Maxim(uint8_t *buff, size_t size );
// Calculate CRC-8 Mifare MAD checksum
uint32_t CRC8Mad(uint8_t *buff, size_t size);
/* Static initialization of a crc structure */
#define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \
.state = ((_initial_value) & ((1L<<(_order))-1)), \