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   源码介绍

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用c#编写的CRC8、CRC16、CRC32校验程序实例。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;



namespace csharpcrc8校验
{
    public partial class Form1 : Form
    {
    //***********************************************
    //28 2C 23 8E 01 00 00    04
    //28 B9 FC 9E 01 00 00    57
    //28 7E 3B 8E 01 00 00    06
    //28 45 37 8E 01 00 00    32
    //28 DF FE 8D 01 00 00    15
    //28 C4 04 8E 01 00 00    25
    //28 64 34 8E 01 00 00    FD
    //08 51 01 11 22 33 44 55 66 77 88 DD     58
    //08 51 0C 11 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF     4E
    //***********************************************

        
        public Form1()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
        /// <summary>
        /// CRC8校验算法
        /// </summary>
        /// <param name="buffer">要校验的数组</param>
        /// <returns>返回校验结果</returns>
        public static byte CRC_8(byte[] buffer)
        {
            byte crc = 0;
            for (int j = 0; j < buffer.Length; 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>
        ///CRC16校验算法,（低字节在前，高字节在后）
        /// </summary>
        /// <param name="data">要校验的数组</param>
        /// <returns>返回校验结果，低字节在前，高字节在后</returns>
        public static byte[] CRC_16(byte[] data)
        {
            if (data.Length == 0)
                throw new Exception("调用CRC16校验算法,（低字节在前，高字节在后）时发生异常，异常信息：被校验的数组长度为0。");
            byte[] temdata = new byte[data.Length   2];
            int xda, xdapoly;
            byte i, j, xdabit;
            xda = 0xFFFF;
            xdapoly = 0xA001;
            for (i = 0; i < data.Length; i  )
            {
                xda ^= data[i];
                for (j = 0; j < 8; j  )
                {
                    xdabit = (byte)(xda & 0x01);
                    xda >>= 1;
                    if (xdabit == 1)
                        xda ^= xdapoly;
                }
            }
            temdata = new byte[2] { (byte)(xda & 0xFF), (byte)(xda >> 8) };
            return temdata;
        }



        /// <summary>
        /// CRC32校验算法
        /// </summary>
        static protected ulong[] Crc32Table;
        //生成CRC32码表
        static public void GetCRC32Table()
        {
            ulong Crc;
            Crc32Table = new ulong[256];
            int i, j;
            for (i = 0; i < 256; i  )
            {
                Crc = (ulong)i;
                for (j = 8; j > 0; j--)
                {
                    if ((Crc & 1) == 1)
                        Crc = (Crc >> 1) ^ 0xEDB88320;
                    else
                        Crc >>= 1;
                }
                Crc32Table[i] = Crc;
            }
        }
        //获取字符串的CRC32校验值
        static public ulong GetCRC32Str(string sInputString)
        {
            //生成码表
            GetCRC32Table();
            byte[] buffer = System.Text.ASCIIEncoding.ASCII.GetBytes(sInputString); ulong value = 0xffffffff;
            int len = buffer.Length;
            for (int i = 0; i < len; i  )
            {
                value = (value >> 8) ^ Crc32Table[(value & 0xFF) ^ buffer[i]];
            }
            return value ^ 0xffffffff;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string strSendData = this.textBox1.Text.Trim();

            String[] strData = strSendData.Split(Convert.ToChar(0x20));
            int index, intCount = strData.Length;
            byte[] LoginData = new byte[intCount];

            this.label5.Text = Convert.ToString(strData.GetLowerBound(0));
            this.label6.Text = Convert.ToString(strData.GetUpperBound(0));

            //byte CRC8 = 0xFF;
            //byte[] CRC16 = 0xFF;

            for (index = 0; index < intCount; index  )
            {

                LoginData[index] = Convert.ToByte(strData[index], 16);
            }
            byte CRC8 = CRC_8(LoginData);
            byte[] CRC16 = CRC_16(LoginData);
            string xx = null;
            for (int i = 0; i < CRC16.Length; i  )
            {
                string x = Convert.ToString(CRC16[i], 16);
                xx  = x;
            }

            this.label3.Text = string.Format("{0:X2}", CRC8).ToUpper();
            this.label5.Text = string.Format("{0:X4}", xx).ToUpper();
            this.label6.Text = string.Format("{0:X8}", GetCRC32Str(this.textBox1.Text.Replace(" ", ""))).ToUpper();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.textBox1.Clear();
            this.label3.Text = "...";
            this.label5.Text = "...";
            this.label6.Text = "...";
        }

    }
}