常见几种校验方法（CS和校验、CRC16、CRC32、BCC异或校验）

总结一些通讯协议中常用到的几种校验方法：

1.CS和校验（如：标准188协议校验方式）

        /// <summary>
        /// CS和校验
        /// </summary>
        /// <param name="Abyte"></param>
        /// <returns></returns>
        public static byte Check_CS(byte[] Abyte)
        {
            byte result = new byte();
            try
            {
                int num = 0;
                for (int i = 0; i < Abyte.Length; i++)
                {
                    num = (num + Abyte[i]) % 256;
                }
                result = (byte)num;
            }
            catch
            {
                result = 0;
            }
            return result;
        }    

2.CRC16校验

CRC16校验的方式比较多（如下图）我这里用到了2种，具体对应那个闹不清了【捂脸】，下方附上CRC校验工具有需要的可以自己尝试下。

CRC校验工具： http://pan.baidu.com/s/1bpD9gbP

        /// <summary>
        /// CRC16校验函数 (一)
        /// </summary>
        /// <param name="x"></param>
        /// <returns></returns>
        private static byte[] CRC16(byte[] x) 
        {
            byte[] temdata = new byte[2];
            int len = x.Length;
            UInt16 crc = 0;
            byte da;
            int i = 0;
            UInt16[] yu = { 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,
                            0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef };
            while (len-- != 0)
            {

                da = (byte)(((byte)(crc / 256)) / 16);
                crc <<= 4;
                crc ^= yu[da ^ x[i] / 16];
                da = (byte)(((byte)(crc / 256)) / 16);
                crc <<= 4;
                crc ^= yu[da ^ x[i] & 0x0f];
                i++;
            }
            temdata[1] = (byte)(crc & 0xFF);
            temdata[0] = (byte)(crc >> 8);
            return temdata;
        }    


        /// <summary>
        /// CRC16校验类 (二)
        /// </summary>
        public static class Crc16
        {
            const ushort polynomial = 0xA001;
            static readonly ushort[] table = new ushort[256];

            /// <summary>
            /// 获得校验字符串
            /// </summary>
            /// <param name="bytes"></param>
            /// <returns></returns>
            public static string ComputeChecksum(byte[] bytes)
            {
                ushort crc = 0;
                for (int i = 0; i < bytes.Length; ++i)
                {
                    byte index = (byte)(crc ^ bytes[i]);
                    crc = (ushort)((crc >> 8) ^ table[index]);
                }
                return crc.ToString("X4");
            }

            static Crc16()
            {
                ushort value;
                ushort temp;
                for (ushort i = 0; i < table.Length; ++i)
                {
                    value = 0;
                    temp = i;
                    for (byte j = 0; j < 8; ++j)
                    {
                        if (((value ^ temp) & 0x0001) != 0)
                        {
                            value = (ushort)((value >> 1) ^ polynomial);
                        }
                        else
                        {
                            value >>= 1;
                        }
                        temp >>= 1;
                    }
                    table[i] = value;
                }
            }
        }    

3.CRC32校验

 private static UInt32[] crcTable = {
                0x0, 0x77073096, 0xee0e612c, 0x990951ba, 0x76dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
                0xedb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x9b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
                0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
                0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
                0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
                0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
                0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
                0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
                0x76dc4190, 0x1db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x6b6b51f, 0x9fbfe4a5, 0xe8b8d433,
                0x7807c9a2, 0xf00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x86d3d2d, 0x91646c97, 0xe6635c01,
                0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
                0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
                0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
                0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
                0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
                0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
                0xedb88320, 0x9abfb3b6, 0x3b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x4db2615, 0x73dc1683,
                0xe3630b12, 0x94643b84, 0xd6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0xa00ae27, 0x7d079eb1,
                0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
                0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
                0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
                0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
                0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
                0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
                0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x26d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x5005713,
                0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0xcb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0xbdbdf21,
                0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
                0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
                0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
                0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
                0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
                0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
            };
        /// <summary>
        /// 获取CRC32校验字符串
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns>4字节16进制码</returns>
        public static string GetCRC32(byte[] bytes)
        {
            int iCount = bytes.Length;
            UInt32 crc = 0xFFFFFFFF;
            for (int i = 0; i < iCount; i++)
            {
                crc = ((crc >> 8) & 0x00FFFFFF) ^ crcTable[(crc ^ bytes[i]) & 0xFF];
            }
            UInt32 temp = crc ^ 0xFFFFFFFF;
            return temp.ToString("X8");
        }

4.BCC异或校验

        /// <summary>
        /// BCC异或取反校验
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string getBCC(byte[] data)
        {
            String ret = "";
            byte[] BCC = new byte[1];
            for (int i = 0; i < data.Length; i++)
            {
                BCC[0] = (byte)(BCC[0] ^ data[i]);
            }
            String hex = ((~ BCC[0]) & 0xFF).ToString("X");//取反操作
            if (hex.Length == 1)
            {
                hex = '0' + hex;
            }
            ret += hex.ToUpper();
            return ret;
        }