C# 校验算法小结

1、计算十六进制字符串的二进制补码校验和

1             string hexString = "0AAE0000463130004144430000";
2             byte[] buf = SoapHexBinary.Parse(hexString).Value;
3 
4             int chkSum = buf.Aggregate(0, (s, b) => s += b) & 0xff;
5             chkSum = (0x100 - chkSum) & 0xff;
6             byte a = (byte)chkSum;
7             var str = chkSum.ToString("X2"); // <-- D9

2、BBC异或校验

       /// <summary>
        /// BCC和校验代码
        /// </summary>
        /// <param name="data">需要校验的数据包</param>
        /// <returns></returns>
        public byte Get_CheckXor(byte[] data)
        {
            byte CheckCode = 0;
            int len = data.Length;
            for (int i = 0; i < len; i++)
            {
                CheckCode ^= data[i];
            }
            return CheckCode;
        }
        /// <summary>
        /// BCC和校验代码返回16进制
        /// </summary>
        /// <param name="data">需要校验的数据包</param>
        /// <returns></returns>
        public string GetBCCXorCode(byte[] data)
        {
            byte CheckCode = 0;
            int len = data.Length;
            for (int i = 0; i < len; i++)
            {
                CheckCode ^= data[i];
            }
            return Convert.ToString(CheckCode, 16).ToUpper();
        }        

3、CRC计算

CRC校验(循环冗余校验)小知识

CRC即循环冗余校验码(Cyclic Redundancy Check):是数据通信领域中最常用的一种查错校验码,其特征是信息字段和校验字段的长度可以任意选定。循环冗余检查(CRC)是一种数据传输检错功能,对数据进行多项式计算,并将得到的结果附在帧的后面,接收设备也执行类似的算法,以保证数据传输的正确性和完整性。

CRC算法参数模型解释: 
NAME:参数模型名称。 
WIDTH:宽度,即CRC比特数。 
POLY:生成项的简写,以16进制表示。例如:CRC-32即是0x04C11DB7,忽略了最高位的"1",即完整的生成项是0x104C11DB7。 
INIT:这是算法开始时寄存器(crc)的初始化预置值,十六进制表示。 
REFIN:待测数据的每个字节是否按位反转,True或False。 
REFOUT:在计算后之后,异或输出之前,整个数据是否按位反转,True或False。 
XOROUT:计算结果与此参数异或后得到最终的CRC值。

     /// <summary>
        /// CRC计算
        /// </summary>
        /// <param name="ptr">传入数据</param>
        /// <param name="len">长度</param>
        /// <returns></returns>
        private static UInt16 CRC16Computer3(byte[] ptr, int len)
        {
            byte da = 0;
            UInt16 crc = 0;
            UInt16[] Crc_Table = new UInt16[256]{
            0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
            0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
            0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
            0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
            0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
            0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
            0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
            0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
            0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
            0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
            0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
            0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
            0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
            0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
            0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
            0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
            0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
            0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
            0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
            0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
            0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
            0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
            0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
            0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
            0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
            0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
            0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
            0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
            0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
            0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
            0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
            0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0};

            for (int i = 0; i <len - 2; i++)
            {
                da = (byte)(crc / 256);        // 以位二进制数暂存CRC 的高位
                crc <<= 8;                   // 左移位
                crc ^= Crc_Table[da ^ ptr[i]];     // 高字节和当前数据XOR 再查表
            }
            return (crc);
        }

附上一个小工具的链接:http://www.ip33.com/crc.html

第三点计算可以通过以下工具验证,参考模型选择:CRC-16/XMODEM

 

 

 

 今日小笔记!!!

posted @ 2020-12-03 10:38  Tulip123  阅读(1344)  评论(0编辑  收藏  举报