CRC-8 & CRC-16

CRC - Cyclic Redundancy Check is widely used in data transition. According to wikipedia.org, A CRC-enabled device calculates a short, fixed-length binary sequence, known as the check value or CRC, for each block of data to be sent or stored and appends it to the data, forming a codeword.

When a codeword is received or read, the device either compares its check value with one freshly calculated from the data block, or equivalently, performs a CRC on the whole codeword and compares the resulting check value with an expected residue constant. If the CRC values do not match, then the block contains a data error.

It's really hard to calculate CRC value by hand, so we add CRC8 & CRC16 algorithm in MTools. And this can really save your time to get the CRC values by one expression. Notice: This is the feature from the full version.

Byte values

There exist 16 bytes on each block of the Mifare 1k card. And you can use b0 b1 b2 ... b14 b15 for calculation.

CRC-8

The value of the CRC-8 result is only 1 byte. Supported CRC8 algorithm in MTools.

Algorithm	Expression	Value
CRC-8	crc8(0,1,5,8)	CRC8 of HEX String of b0 b1 b5 b8
CRC-8/CDMA2000	crc8cdma2000(0:14)	CRC8-/CDMA2000 of b0 to b14
CRC-8/DARC	crc8darc(0:14)	idem
CRC-8/DVB-S2	crc8dvs2(0:14)	idem
CRC-8/EBU	crc8eu(0:14)	idem
CRC-8/I-CODE	crc8icode(0:14)	idem
CRC-8/ITU	crc8itu(0:14)	idem
CRC-8/MAXIM	crc8maxim(0:14)	idem
CRC-8/ROHC	crc8rohc(0:14)	idem
CRC-8/WCDMA	crc8wcdma(0:14)	idem

CRC-16

The value of CRC16 contains 2 bytes. To get these two separately, 0 or 1 need to be added after the expression. Supported CRC16 algorithm in MTools.

Algorithm	Expression 0	Expression 1	Xor Value
CRC-16/CCITT-FALSE	crc16ccittfalse(0:14)0	crc16ccittfalse(0:14)1	crc16ccittfalse(0:14)
CRC-16/ARC	crc16arc(0:14)0	crc16arc(0:14)1	crc16arc(0:14)
CRC-16/AUG-CCITT	crc16augccitt(0:14)0	crc16augccitt(0:14)1	crc16augccitt(0:14)
CRC-16/BUYPASS	crc16buypass(0:14)0	crc16buypass(0:14)1	crc16buypass(0:14)
CRC-16/CDMA2000	crc16cdma2000(0:14)0	crc16cdma2000(0:14)1	crc16cdma2000(0:14)
CRC-16/DDS-110	crc16dds110(0:14)0	crc16dds110(0:14)1	crc16dds110(0:14)
CRC-16/DECT-R	crc16dectr(0:14)0	crc16dectr(0:14)1	crc16dectr(0:14)
CRC-16/DECT-X	crc16dectx(0:14)0	crc16dectx(0:14)1	crc16dectx(0:14)
CRC-16/DNP	crc16dnp(0:14)0	crc16dnp(0:14)1	crc16dnp(0:14)
CRC-16/EN-13757	crc16en13757(0:14)0	crc16en13757(0:14)1	crc16en13757(0:14)
CRC-16/GENIBUS	crc16genibus(0:14)0	crc16genibus(0:14)1	crc16genibus(0:14)
CRC-16/MAXIM	crc16maxim(0:14)0	crc16maxim(0:14)1	crc16maxim(0:14)
CRC-16/MCRF4XX	crc16mcrf4xx(0:14)0	crc16mcrf4xx(0:14)1	crc16mcrf4xx(0:14)
CRC-16/RIELLO	crc16riello(0:14)0	crc16riello(0:14)1	crc16riello(0:14)
CRC-16/T10-DIF	crc16t10dif(0:14)0	crc16t10dif(0:14)1	crc16t10dif(0:14)
CRC-16/TELEDISK	crc16teledisk(0:14)0	crc16teledisk(0:14)1	crc16teledisk(0:14)
CRC-16/TMS37157	crc16tms37157(0:14)0	crc16tms37157(0:14)1	crc16tms37157(0:14)
CRC-16/USB	crc16usb(0:14)0	crc16usb(0:14)1	crc16usb(0:14)
CRC-A	crc16a(0:14)0	crc16a(0:14)1	crc16a(0:14)
CRC-16/KERMIT	crc16kermit(0:14)0	crc16kermit(0:14)1	crc16kermit(0:14)
CRC-16/MODBUS	crc16modbus(0:14)0	crc16modbus(0:14)1	crc16modbus(0:14)
CRC-16/X-25	crc16x25(0:14)0	crc16x25(0:14)1	crc16x25(0:14)
CRC-16/XMODEM	crc16xmodem(0:14)0	crc16xmodem(0:14)1	crc16xmodem(0:14)

CRC-8 / CRC16 in Sniffer

The expression of the last byte b15 is CRC-8/MAXIM, and the results are calculated correctly in a second.