C# CRC8、CRC16校验

一、校验封装到一个类

    public class CrcCheck
    {
        public static byte CRC8(byte[] buffer)
        {
            byte crc = 0;
            for (int j = 1; j <= buffer.Length-3; j++)
            {
                crc ^= buffer[j];
                for (int i = 0; i < 8; i++)
                {
                    if ((crc & 0x01) != 0)
                    {
                        crc >>= 1;
                        crc ^= 0x8c;
                    }
                    else
                    {
                        crc >>= 1;
                    }
                }
            }
            return crc;
        }
        /// <summary>
        /// 字节0是低八位，字节1是高八位
        /// </summary>
        /// <param name="buffer"></param>
        /// <returns></returns>
        public static byte[] CRC16(byte[] data)
        {
            int crc = 0xffff;
            for (int i = 0; i < data.Length-2; i++)
            {
                crc = crc ^ data[i];
                for (int j = 0; j < 8; j++)
                {
                    int temp = 0;
                    temp = crc & 1;
                    crc = crc >> 1;
                    crc = crc & 0x7fff;
                    if (temp == 1)
                    {
                        crc = crc ^ 0xa001;
                    }
                    crc = crc & 0xffff;
                }
            }
            //CRC寄存器高低位互换
            byte[] crc16 = new byte[2];
            crc16[1] = (byte)((crc >> 8) & 0xff);
            crc16[0] = (byte)(crc & 0xff);
            return crc16;
        }
    }