crc16位校验码c#算法
举个例子
输入字节数组byte[]{ 47 78 00 01 00 00 00 BC 00 00 00 01 00 00 00 BC 00 02 54 D2}
得出校验码 0x6A6B
#region CRC16校验 /// <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 int[] crc16(int[] 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。"); int[] temdata = new int[data.Length + 2]; int xda, xdapoly; int i, j, xdabit; xda = 0xFFFF; xdapoly = 0xA001; for (i = 0; i < data.Length; i++) { xda ^= data[i]; for (j = 0; j < 8; j++) { xdabit = (int)(xda & 0x01); xda >>= 1; if (xdabit == 1) xda ^= xdapoly; } } temdata = new int[2] { (int)(xda & 0xFF), (int)(xda >> 8) }; return temdata; } /// <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[] crc16(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; } #endregion
using System; namespace CRC { /// <summary> /// CRC16 的摘要说明。 /// </summary> public class CRC16:ICRC { #region CRC 16 位校验表 /// <summary> /// 16 位校验表 Upper 表 /// </summary> public ushort[] uppercrctab = new ushort[] { 0x0000,0x1231,0x2462,0x3653,0x48c4,0x5af5,0x6ca6,0x7e97, 0x9188,0x83b9,0xb5ea,0xa7db,0xd94c,0xcb7d,0xfd2e,0xef1f }; /// <summary> /// 16 位校验表 Lower 表 /// </summary> public ushort[] lowercrctab = new ushort[] { 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef }; #endregion ushort crc = 0; /// <summary> /// 校验后的结果 /// </summary> public long Value { get { return crc; } set { crc = (ushort)value; } } /// <summary> /// 设置crc 初始值 /// </summary> public void Reset() { crc = 0; } /// <summary> /// Crc16 /// </summary> /// <param name="ucrc"></param> /// <param name="buf"></param> public void Crc(ushort ucrc,byte[] buf) { crc = ucrc; Crc(buf); } /// <summary> /// Crc16 /// </summary> /// <param name="bval"></param> public void Crc(int bval) { ushort h = (ushort)((crc >> 12) & 0x0f); ushort l = (ushort)((crc >> 8 ) & 0x0f); ushort temp = crc; temp =(ushort)(((temp & 0x00ff) << 8) | bval); temp =(ushort)(temp ^(uppercrctab[(h -1) + 1] ^ lowercrctab[(l - 1) + 1])); crc = temp; } /// <summary> /// Crc16 /// </summary> /// <param name="buffer"></param> public void Crc(byte[] buffer) { Crc(buffer,0,buffer.Length); } /// <summary> /// Crc16 /// </summary> /// <param name="buf"></param> /// <param name="off"></param> /// <param name="len"></param> public void Crc(byte[] buf,int off,int len) { if (buf == null) { throw new ArgumentNullException("buf"); } if (off < 0 || len < 0 || off + len > buf.Length) { throw new ArgumentOutOfRangeException(); } for (int i = off; i < len ; i ++) { Crc(buf[i]); } } } } 分类