查表法：(生成多项式X^8+X^6+X^4+X^3+X^2+X^1)

const uchar crctable[] = {

0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,

157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,

35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,

190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,

70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,

219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,

101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,

248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,

140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,

17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,

175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,

50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,

202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,

87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,

233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,

116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53};

UCHAR CRC8(UCHAR IN，UCHAR CRC)

{

IN^= crc;

crc = crctable[IN];

RETURN  crc ；

}

VOID MAIN (VOID)

{

CRC=0；

FOR(I=0；I<100;I++)

CRC=CRC8(TABLE[I],CRC);

}

算法：

UCHAR CRC8(UCHAR IN，UCHAR CRC)

{

uchar i,crc;

for (i=0;i<8;i )

{

if ((IN&1)^(crc&0x80)==0) {crc<<=1;} /* 做(1),(2); (1)=0,则CRC向高位移1位. */

else

{

crc=crc^0x18; /* (1)=1,则异或18 */

crc<<=1;

crc|=1; /* 置CRC.0为1 */

}

IN>>=1;

}

}

备注：在数据传输中CRC或传过来的数据，可能低字节在前，高字节在后，这就造成查表法表中被查数据不同。