// Works for 26bits.
int GetPyramidBits(uint32_t fc, uint32_t cn, uint8_t *pyramidBits) {
uint8_t pre[128];
memset(pre, 0x00, sizeof(pre));
// format start bit
pre[79] = 1;
// Get 26 wiegand from FacilityCode, CardNumber
uint8_t wiegand[24];
memset(wiegand, 0x00, sizeof(wiegand));
num_to_bytebits(fc, 8, wiegand);
num_to_bytebits(cn, 16, wiegand+8);
// add wiegand parity bits (dest, source, len)
wiegand_add_parity(pre+80, wiegand, 24);
// add paritybits (bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
addParity(pre+8, pyramidBits+8, 102, 8, 1);
// add checksum
uint8_t csBuff[13];
for (uint8_t i = 0; i < 13; i++)
csBuff[i] = bytebits_to_byte(pyramidBits + 16 + (i*8), 8);
uint32_t crc = CRC8Maxim(csBuff, 13);
num_to_bytebits(crc, 8, pyramidBits+120);
return 1;
}
int GetNedapBits(uint32_t cn, uint8_t *nedapBits) {
uint8_t pre[128];
memset(pre, 0x00, sizeof(pre));
// preamble 1111 1111 10 = 0xFF8
num_to_bytebits(0xFF8, 12, pre);
// fixed tagtype code? 0010 1101 = 0x2D
num_to_bytebits(0x2D, 8, pre+10);
// 46 encrypted bits - UNKNOWN ALGO
// -- 16 bits checksum. Should be 4x4 checksum, based on UID and 2 constant values.
// -- 30 bits undocumented?
//num_to_bytebits(cn, 46, pre+18);
//----from this part, the UID in clear text, with a 1bit ZERO as separator between bytes.
pre[64] = 0;
pre[73] = 0;
pre[82] = 0;
pre[91] = 0;
pre[100] = 0;
pre[109] = 0;
pre[118] = 0;
// cardnumber (uid)
num_to_bytebits( (cn >> 0) & 0xFF, 8, pre+65);
num_to_bytebits( (cn >> 8) & 0xFF, 8, pre+74);
num_to_bytebits( (cn >> 16) & 0xFF, 8, pre+83);
// two ?
num_to_bytebits( 0, 8, pre+92);
num_to_bytebits( 0, 8, pre+101);
// chksum
num_to_bytebits( (0 >> 0) & 0xFF, 8, pre+110);
num_to_bytebits( (0 >> 8) & 0xFF, 8, pre+119);
// add paritybits (bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
addParity(pre, pre+64, 64, 8, 1);
addParity(pre+64, pre+64, 64, 8, 1);
pre[63] = GetParity( DemodBuffer, EVEN, 63);
pre[127] = GetParity( DemodBuffer+64, EVEN, 63);
memcpy(nedapBits, pre, 128);
// 1111111110001011010000010110100011001001000010110101001101011001000110011010010000000000100001110001001000000001000101011100111
return 1;
}
