crc.c

包括ＥＰＡ协议栈

#include "crc.h"

uint8 crc81_check(uint8 *scm_ptr_in, uint16 scm_length, uint32 relationkey)
{
	unsigned int Polynomial_81;
	uint8 crc81 ;// CRC 码初值
	uint8 len=scm_length;
	uint8 *scm_ptr;
	uint8 tt[10];//用于保存到来的数组。
	uint8 *key_ptr;
	uint8 crckey;
	uint8 i;

	Polynomial_81 = 0x137;
	crckey=0x00;
	for(i=0;i<sizeof(relationkey);i++)
	{
		int k=i*8;//移动的位置
		tt[len]=(uint8)(relationkey>>k);
	}

	key_ptr=tt;
	while(i--)
	{
		for(i=0x80; i!=0; i>>=1)
		{
			if((crckey&0x80)!=0) {crckey<<=1; crckey=Polynomial_81;} 
			else crckey<<=1; 
			if(((*key_ptr)&i)!=0) crckey^=Polynomial_81; 
		}
		scm_ptr++;
	}

	scm_ptr=scm_ptr_in;
	crc81=crckey;
	while(len--)
	{
		for(i=0x80; i!=0; i>>=1)
		{
			if((crc81&0x80)!=0) {crc81<<=1; crc81^=Polynomial_81;} 
			else crc81<<=1; 
			if(((*scm_ptr)&i)!=0) crc81^=Polynomial_81; 
		}
		scm_ptr++;
	}
	return crc81;
}


/***********************************************************************
*crc82,g(x) = x8 + x5 + x4 + x3 + x1 +1  [0x13b]；
*要求提供SCM接口指针，还有SCM长度；
*返回值就是CRC校验码；
***********************************************************************/
uint8 crc82_check(uint8 *scm_ptr_in, uint16 scm_length, uint32 relationkey)
{
	uint32 Polynomial_82;
	uint8 crc82; // CRC 码初值
	uint8 len;
	uint8 *scm_ptr;
	uint8 tt[10];//用于保存到来的数组。
	uint8 i;
	uint8 crckey;
	uint8 *key_ptr;

	len=scm_length;
	Polynomial_82 = 0x13b;
	crckey=0x00;
	for(i=0;i<sizeof(relationkey);i++)
	{
		int k=i*8;//移动的位置
		tt[len]=(uint8)(relationkey>>k);
	}

	key_ptr=tt;
	while(i--)
	{
		for(i=0x80; i!=0; i>>=1)
		{
			if((crckey&0x80)!=0) {crckey<<=1; crckey=Polynomial_82;} 
			else crckey<<=1; 
			if(((*key_ptr)&i)!=0) crckey^=Polynomial_82; 
		}
		scm_ptr++;
	}

	scm_ptr=scm_ptr_in;
	crc82=crckey;
	while(len--)
	{
		for(i=0x80; i!=0; i>>=1)
		{
			if((crc82&0x80)!=0) {crc82<<=1; crc82^=Polynomial_82;} 
			else crc82<<=1; 
			if(((*scm_ptr)&i)!=0) crc82^=Polynomial_82; 
		}
		scm_ptr++;
	}
	return crc82;	
}

/***********************************************************************
*crc16,g(x) = x16 + x11 + x3 + x2 + x1 +1 [0x1080F]；
*要求提供SCM接口指针，还有SCM长度；
*返回值就是CRC校验码；
***********************************************************************/

uint16 crc_table16[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
};

uint16 crc16_check(uint8 *scm_ptr_in, uint16 scm_length, uint32 relationkey)
{
	//uint16 Polynomial_16 = 0x1080F;//这个不起作用了
	uint16 crc16;// CRC 码初值
	uint8 da;
	uint16 len=scm_length;
	uint8 *scm_ptr;
	uint8 tt[10];
	uint16 i;
	uint8 *scm_ptrkey;
	uint16 crckey;
		
	//下面是对relationkey进行的校验操作
	for(i=0;i<(sizeof(relationkey));i++)
	{
		int k=i*8;//移动的位置
		tt[3-i]=(uint8)(relationkey>>k);
	}

	scm_ptrkey=tt;
	crckey=0x0000;
	while(i--!=0)
		{
			da=(uint8) (crckey>>8); // 以8 位二进制数暂存CRC 的高8 位
			crckey<<=8; // 左移8 位
			crckey^=crc_table16[da^*scm_ptrkey]; // 高字节和当前数据XOR 再查表
			scm_ptrkey++;
		}
	
	scm_ptr=scm_ptr_in;
	crc16=crckey;
	while(len--!=0)
		{
			da=(uint8) (crc16>>8); // 以8 位二进制数暂存CRC 的高8 位
			crc16<<=8; // 左移8 位
			crc16^=crc_table16[da^*scm_ptr]; // 高字节和当前数据XOR 再查表
			scm_ptr++;
		}

	return crc16;
}

/***********************************************************************
*crc32,g(x) = x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x +1 Bit-reversed to [0xEBD88320]；
*要求提供SCM接口指针，还有SCM长度；
*返回值就是CRC校验码；
***********************************************************************/
uint32 crc32_table[256]={
0x00,  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,
};

uint32 crc32_check(uint8 *scm_ptr, uint16 scm_length, uint32 relationkey)
{

	uint32 oldcrc32;
	
	//uint32 crc32;
	uint32 oldcrc;
	uint32 charcnt;
  uint32 c,t;
	uint32 len;	
	uint32 oldcrckey;
	uint32 charcntkey;
	
	//下面是对relationkey进行的校验操作
	uint32 key_length;
	uint32 *ptr;
	uint8 tt[4];
	uint16 i;
	
	charcnt=0;
	key_length=1;
	len=scm_length;
	for(i=0;i<(sizeof(relationkey));i++)
	{
		int k=i*8;//移动的位置
		tt[3-i]=(uint8)(relationkey>>k);
	}
	ptr=(uint32 *)tt;
	oldcrckey=0x00000000;
	charcntkey=0;
	while (key_length--) 
		{
			t= (oldcrckey >> 24) & 0xFF;   //要移出的字节的值
			oldcrc=crc32_table[t];         //根据移出的字节的值查表
			c=ptr[charcnt];          //新移进来的字节值
			oldcrckey= (oldcrckey << 8) | c;   //将新移进来的字节值添在寄存器末字节中
			oldcrckey=oldcrckey^oldcrc;     //将寄存器与查出的值进行xor运算
			charcntkey++;
		}

	//接着是SCM进行校验
	oldcrc32 = oldcrckey; //初值为oldcrckey
	while (len--) 
		{
			t= (oldcrc32 >> 24) & 0xFF;   //要移出的字节的值
			oldcrc=crc32_table[t];         //根据移出的字节的值查表
			c=scm_ptr[charcnt];          //新移进来的字节值
			oldcrc32= (oldcrc32 << 8) | c;   //将新移进来的字节值添在寄存器末字节中
			oldcrc32=oldcrc32^oldcrc;     //将寄存器与查出的值进行xor运算
			charcnt++;
		}

	return oldcrc32;//return the crc value	

}