求CRC16源码

Question

谷歌半天。也没找到C#版本的CRC16校验源码。至少我没用明白。我就是想把16进制数据传进去，然后给返回高字节，低字节，就OK。怎么弄啊？
看网上好多应该都是正确的，就是不会用啊。

Answer 1

byte[] crcCit = new byte[2];// 接收到字节数组
 byte[] byteMessage = new byte[16] { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
       
byte[] byteTime = new byte[] { byteMessage[0], byteMessage[1] ......};
 crcCit = this.GetCRCCcitt(byteTime); // 校验位的判断
if ((crcCit[0] == XXXXX) && (crcCit[1] == ????????))
{
    ...............
}      
       /// <summary>
        /// CRC16-CCITT检验码的取得
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public byte[] GetCRCCcitt(byte[] data)
        {
            long crc = 0;
            byte i = 0x80;
            int j = 0;            // 高位字节
            string crch;
            // 低位字节
            string crcl;            byte[] bytes = new byte[2];             for (j = 0; j < data.Length; j++)
            {
                i = 0x80;                while (i != 0)
                {
                    if ((crc & 0x8000) != 0)
                    {
                        crc = crc * 2;
                        crc = crc ^ 0x1021;
                    }
                    else
                    {
                        crc = crc * 2;
                    }                    if ((data[j] & i) != 0)
                    {
                        crc = crc ^ 0x1021;
                    }                    i = Convert.ToByte(i / 2);                    if (crc > 65536)
                    {
                        crc = crc - 65536;
                    }
                }
            }            // 取得高位字节
            int intCrc = Convert.ToByte(crc / 256);
            crch = Convert.ToString(intCrc, 16);
            if (crch.Length == 1)
            {
                crch = "0" + crch;
            }            // 取得低位字节
            crcl = Convert.ToString(crc % 256, 16);
            if (crcl.Length == 1)
            {
                crcl = "0" + crcl;
            }            bytes[0] = (byte)Convert.ToByte(crch.Substring(0, 2), 16);
            bytes[1] = (byte)Convert.ToByte(crcl.Substring(0, 2), 16);            return bytes;
        }

Answer 2

楼上仁兄的我没哟个明白啊。比如我要求“05 05 05 05”的CRC16校验码等于多少。怎么做？
求赐教