CCITT标准CRC16(1021) Java代码

背景：

与GPS运营商做数据对接，图片、GPS、轨迹所有数据数据包中都有CRC校验值，需要对数据包进行校验。

Java代码:

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1. package com.jst.util;  
2.   
3. /** 
4.  * CRC-CCITT 算法校验类 
5.  *  
6.  * @author amadowang 
7.  * @version [版本号, Aug 29, 2011] 
8.  * @see [相关类/方法] 
9.  * @since [产品/模块版本] 
10.  * @date 2012-10-24 
11.  */  
12. public class CRCUtil {  
13.     /* 
14.      * CCITT标准CRC16(1021)余数表 CRC16-CCITT ISO HDLC, ITU X.25, x16+x12+x5+1 多项式 
15.      * 高位在先时生成多项式 Gm=0x11021 低位在先时生成多项式，Gm=0x8408 本例采用高位在先 
16.      */  
17.     private static int crc16_ccitt_table[] = { 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a,  
18.             0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b,  
19.             0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528,  
20.             0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719,  
21.             0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e,  
22.             0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf,  
23.             0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec,  
24.             0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd,  
25.             0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2,  
26.             0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3,  
27.             0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0,  
28.             0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691,  
29.             0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806,  
30.             0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37,  
31.             0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64,  
32.             0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55,  
33.             0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 };  
34.   
35.   
36.     /** 
37.      *  
38.      * @param reg_init CRC校验时初值 
39.      * @param message 校验值 
40.      * @return 
41.      */  
42.     private static int do_crc(int reg_init, byte[] message) {  
43.         int crc_reg = reg_init;  
44.         for (int i = 0; i < message.length; i++) {  
45.             crc_reg = (crc_reg >> 8) ^ crc16_ccitt_table[(crc_reg ^ message[i]) & 0xff];  
46.         }  
47.         return crc_reg;  
48.     }  
49.   
50.     /** 
51.      * 根据数据生成CRC校验码 
52.      *  
53.      * @param message 
54.      *            byte数据 
55.      *  
56.      * @return int 返校验码 
57.      */  
58.     private static int do_crc(byte[] message) {  
59.         // 计算CRC校验时初值从0x0000开始。  
60.         int crc_reg = 0x0000;  
61.         return do_crc(crc_reg, message);  
62.     }  
63.     /** 
64.      * db44检验方法 
65.      *  
66.      * @param message 消息内容 
67.      * @param crc 检验码值 
68.      * @return 
69.      */  
70.     private static boolean do_crc(byte[] message,byte[] crc) {  
71.         // 计算CRC校验时初值从0x0000开始。  
72.         int crc_reg = 0x0000;  
73.         int crc_value = (crc[0]&0xff)*256+(crc[1]&0xff);  
74.         return crc_value ==do_crc(crc_reg, message);  
75.     }  
76.     /** 
77.      * 供db44结构代码使用,数组后两位为CRC-校验码值 
78.      * @param messages 
79.      * @return 
80.      */  
81.     public static boolean do_crc_db44(byte[] messages) {  
82.         // 计算CRC校验时初值从0x0000开始。  
83.         byte[] messageArray = new byte[messages.length-2];  
84.         byte[] crcArray = new byte[2];  
85.         System.arraycopy(messages, 0, messageArray, 0, messageArray.length);  
86.         System.arraycopy(messages, messages.length-2, crcArray, 0, 2);  
87.         return do_crc(messageArray, crcArray);  
88.     }  
89.   
90.     public static void main(String[] args) {  
91.         // 一个db44测试样本数据  
92.         byte p[] = {71,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,68,31,32,0,1,2};  
93.         int crc = do_crc(p); // 计算前两位的CRC码  
94.         // 65336  
95.         System.out.println(crc);  
96.           
97.     }  
98.   
99. }  

package com.jst.util;/** * CRC-CCITT 算法校验类 *  * @author amadowang * @version [版本号, Aug 29, 2011] * @see [相关类/方法] * @since [产品/模块版本] * @date 2012-10-24 */public class CRCUtil {/* * CCITT标准CRC16(1021)余数表 CRC16-CCITT ISO HDLC, ITU X.25, x16+x12+x5+1 多项式 * 高位在先时生成多项式 Gm=0x11021 低位在先时生成多项式，Gm=0x8408 本例采用高位在先 */private static int crc16_ccitt_table[] = { 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 };/** *  * @param reg_init CRC校验时初值 * @param message 校验值 * @return */private static int do_crc(int reg_init, byte[] message) {int crc_reg = reg_init;for (int i = 0; i < message.length; i++) {crc_reg = (crc_reg >> 8) ^ crc16_ccitt_table[(crc_reg ^ message[i]) & 0xff];}return crc_reg;}/** * 根据数据生成CRC校验码 *  * @param message *            byte数据 *  * @return int 返校验码 */private static int do_crc(byte[] message) {// 计算CRC校验时初值从0x0000开始。int crc_reg = 0x0000;return do_crc(crc_reg, message);}/** * db44检验方法 *  * @param message 消息内容 * @param crc 检验码值 * @return */private static boolean do_crc(byte[] message,byte[] crc) {// 计算CRC校验时初值从0x0000开始。int crc_reg = 0x0000;int crc_value = (crc[0]&0xff)*256+(crc[1]&0xff);return crc_value ==do_crc(crc_reg, message);}/** * 供db44结构代码使用,数组后两位为CRC-校验码值 * @param messages * @return */public static boolean do_crc_db44(byte[] messages) {// 计算CRC校验时初值从0x0000开始。byte[] messageArray = new byte[messages.length-2];byte[] crcArray = new byte[2];System.arraycopy(messages, 0, messageArray, 0, messageArray.length);System.arraycopy(messages, messages.length-2, crcArray, 0, 2);return do_crc(messageArray, crcArray);}public static void main(String[] args) {// 一个db44测试样本数据byte p[] = {71,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,68,31,32,0,1,2};int crc = do_crc(p); // 计算前两位的CRC码// 65336System.out.println(crc);}}

原文地址：http://blog.csdn.net/javaee_ssh/article/details/27202753