void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){
uint8_t bt = 0;
int i;
if (len != 1) {
for (i = 0; i < len; i++)
data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];
} else {
bt = 0;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 0)) << 0;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 1)) << 1;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 2)) << 2;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 3)) << 3;
data[0] = bt;
}
return;
}
uint8_t mf_crypto1_encrypt4bit(struct Crypto1State *pcs, uint8_t data) {
uint8_t bt = 0;
int i;
for (i = 0; i < 4; i++)
bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, i)) << i;
return bt;
}
// crypto1 helpers
void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len){
uint8_t bt = 0;
int i;
if (len != 1) {
for (i = 0; i < len; i++)
data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i];
} else {
bt = 0;
for (i = 0; i < 4; i++)
bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], i)) << i;
data[0] = bt;
}
return;
}
int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t *answer, uint8_t *answer_parity, uint32_t *timing)
{
uint8_t dcmd[4], ecmd[4];
uint16_t pos, res;
uint8_t par[1]; // 1 Byte parity is enough here
dcmd[0] = cmd;
dcmd[1] = data;
AppendCrc14443a(dcmd, 2);
memcpy(ecmd, dcmd, sizeof(dcmd));
if (crypted) {
par[0] = 0;
for (pos = 0; pos < 4; pos++)
{
ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];
par[0] |= (((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) << (7-pos));
}
ReaderTransmitPar(ecmd, sizeof(ecmd), par, timing);
} else {
ReaderTransmit(dcmd, sizeof(dcmd), timing);
}
int len = ReaderReceive(answer, par);
if (answer_parity) *answer_parity = par[0];
if (crypted == CRYPT_ALL) {
if (len == 1) {
res = 0;
for (pos = 0; pos < 4; pos++)
res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;
answer[0] = res;
} else {
for (pos = 0; pos < len; pos++)
{
answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];
}
}
}
return len;
}
int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
{
// variables
int len, i;
uint32_t pos;
uint8_t par[3] = {0}; // enough for 18 Bytes to send
byte_t res;
uint8_t d_block[18], d_block_enc[18];
uint8_t* receivedAnswer = get_bigbufptr_recvrespbuf();
uint8_t* receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE;
// command MIFARE_CLASSIC_WRITEBLOCK
len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer, receivedAnswerPar, NULL);
if ((len != 1) || (receivedAnswer[0] != 0x0A)) { // 0x0a - ACK
if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
return 1;
}
memcpy(d_block, blockData, 16);
AppendCrc14443a(d_block, 16);
// crypto
for (pos = 0; pos < 18; pos++)
{
d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
par[pos>>3] |= (((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) << (7 - (pos&0x0007)));
}
ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par, NULL);
// Receive the response
len = ReaderReceive(receivedAnswer, receivedAnswerPar);
res = 0;
for (i = 0; i < 4; i++)
res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;
if ((len != 1) || (res != 0x0A)) {
if (MF_DBGLEVEL >= 1) Dbprintf("Cmd send data2 Error: %02x", res);
return 2;
}
return 0;
}
