github/RRG-Proxmark3
1
0
Fork 0
mirror of https://github.com/RfidResearchGroup/proxmark3.git synced 2025-08-14 18:48:13 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

Legic: Implemented write command for card simulation

Browse source
This commit is contained in:
AntiCat 2018-09-05 22:23:44 +02:00
commit e1fa1e659a
1 changed files with 25 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

25
armsrc/legicrfsim.c
View file

@ -411,6 +411,31 @@ static int32_t connected_phase(legic_card_select_t *p_card) {
// transmit data
tx_frame((crc << 8) | byte, 12);
return 0;
}
// check if command is LEGIC_WRITE
if(len == p_card->cmdsize + 8 + 4) {
// decode data
uint16_t mask = (1 << p_card->addrsize) - 1;
uint16_t addr = (cmd >> 1) & mask;
uint8_t byte = (cmd >> p_card->cmdsize) & 0xff;
uint8_t crc = (cmd >> (p_card->cmdsize + 8)) & 0xf;
// check received against calculated crc
uint8_t calc_crc = calc_crc4(addr << 1, p_card->cmdsize, byte);
if(calc_crc != crc) {
Dbprintf("!!! crc mismatch: %x != %x !!!", calc_crc, crc);
return -1;
}
// store data
legic_mem[addr] = byte;
// transmit ack
tx_ack();
return 0;
}