crc8\crc16\crc32\md5 的C语言实现

以下常用的各种校验和值、哈希值的计算实现，都是自己在项目中经常使用到的，有部分内容是从网络资源上获得的参考，但大部分是自己写的。

特意整理下来，以备不时之需，希望共享给大家，也希望对于提升大家的工作效率有所有帮助。

转载请注明出处，谢谢。

crc8 的C语言实现：

const uchar crc8_854_table[] =
{
	0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
	157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
	35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
	190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
	70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
	219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
	101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
	248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
	140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
	17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
	175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
	50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
	202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
	87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
	233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
	116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
};

uchar DealCrcpro(uchar L_pt[],uchar ucLengthTmp)
{
	uchar ucTmp;
	uchar ucCheckSum;
	ucCheckSum = 0;
	for(ucTmp = 0; ucTmp < ucLengthTmp; ucTmp++)
	{
		ucCheckSum = crc8_854_table[ucCheckSum^(L_pt[ucTmp])];
	}
	return(ucCheckSum);
}

crc16的C语言实现：

public static int crcTable(byte[] bytes) { 
        public final static int[] table = { 
            0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 
            0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, 
            0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, 
            0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, 
            0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, 
            0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, 
            0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, 
            0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, 
            0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, 
            0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, 
            0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, 
            0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, 
            0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, 
            0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, 
            0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, 
            0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, 
            0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, 
            0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, 
            0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, 
            0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, 
            0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, 
            0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, 
            0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, 
            0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, 
            0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, 
            0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, 
            0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, 
            0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, 
            0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, 
            0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, 
            0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, 
            0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040, 
        }; 

        int crc = 0x0000; 
        
        for (byte b : bytes) { 
            crc = (crc >>> 8) ^ table[(crc ^ b) & 0xff]; 
        } 

        return  crc; 
    } 

crc32实现：

   static const unsigned int  CRC32_Table[256] =
   {
       0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
       0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
       0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
       0x09B64C2B, 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, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
       0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
       0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
       0x7F6A0DBB, 0x086D3D2D, 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, 0x03B6E20C, 0x74B1D29A,
       0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
       0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
       0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 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, 0x026D930A,
       0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
       0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
       0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
       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
    };

#define INIT  0xffffffff
#define XOROT 0xffffffff

unsigned int crc32(void *p, unsigned int counter)
{


     unsigned int uCRCValue;
     unsigned char *pData;
     unsigned int uSize = counter;

     /* init the start value */
     uCRCValue = INIT;
     pData = (unsigned char*)p;

     QString str_p = "pData_pointer address: 0x" + QString::number(int(pData), 16);
     DBG(str_p);

     /* calculate CRC */
     while (uSize --)
     {
         uCRCValue = CRC32_Table[(uCRCValue ^ *pData++) & 0xFF] ^ (uCRCValue >> 8);
     }
     /* XOR the output value */
     return uCRCValue ^ XOROT;
}

md5 计算的C语言实现

typedef struct//very important!
{
	unsigned int total[2];          /*!< number of bytes processed  */
	unsigned int state[4];          /*!< intermediate digest state  */
	unsigned char buffer[64];   /*!< data block being processed */

}mbedtls_md5_context;

void zeroize( void *v, size_t n )
{ 
	volatile unsigned char *p = (unsigned char *)v; 
	while( n-- ) 
		*p++ = 0;
}

void md5_process( md5_context *ctx, const unsigned char data[64] )
{ 
	uint32_t X[16], A, B, C, D; 
	GET_UINT32_LE( X[ 0], data, 0 ); 
	GET_UINT32_LE( X[ 1], data, 4 ); 
	GET_UINT32_LE( X[ 2], data, 8 ); 
	GET_UINT32_LE( X[ 3], data, 12 ); 
	GET_UINT32_LE( X[ 4], data, 16 ); 
	GET_UINT32_LE( X[ 5], data, 20 ); 
	GET_UINT32_LE( X[ 6], data, 24 ); 
	GET_UINT32_LE( X[ 7], data, 28 ); 
	GET_UINT32_LE( X[ 8], data, 32 ); 
	GET_UINT32_LE( X[ 9], data, 36 ); 
	GET_UINT32_LE( X[10], data, 40 ); 
	GET_UINT32_LE( X[11], data, 44 ); 
	GET_UINT32_LE( X[12], data, 48 ); 
	GET_UINT32_LE( X[13], data, 52 ); 
	GET_UINT32_LE( X[14], data, 56 );
	GET_UINT32_LE( X[15], data, 60 );
	
	#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
	#define P(a,b,c,d,k,s,t) \
	{ \ 
		a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
	} 
	A = ctx->state[0];
	B = ctx->state[1]; 
	C = ctx->state[2]; 
	D = ctx->state[3];
	
	#define F(x,y,z) (z ^ (x & (y ^ z))) 
	
	P( A, B, C, D, 0, 7, 0xD76AA478 ); 
	P( D, A, B, C, 1, 12, 0xE8C7B756 ); 
	P( C, D, A, B, 2, 17, 0x242070DB ); 
	P( B, C, D, A, 3, 22, 0xC1BDCEEE ); 
	P( A, B, C, D, 4, 7, 0xF57C0FAF ); 
	P( D, A, B, C, 5, 12, 0x4787C62A ); 
	P( C, D, A, B, 6, 17, 0xA8304613 ); 
	P( B, C, D, A, 7, 22, 0xFD469501 ); 
	P( A, B, C, D, 8, 7, 0x698098D8 ); 
	P( D, A, B, C, 9, 12, 0x8B44F7AF ); 
	P( C, D, A, B, 10, 17, 0xFFFF5BB1 ); 
	P( B, C, D, A, 11, 22, 0x895CD7BE ); 
	P( A, B, C, D, 12, 7, 0x6B901122 ); 
	P( D, A, B, C, 13, 12, 0xFD987193 ); 
	P( C, D, A, B, 14, 17, 0xA679438E ); 
	P( B, C, D, A, 15, 22, 0x49B40821 );
	
	#undef F#define F(x,y,z) (y ^ (z & (x ^ y))) 
	
	P( A, B, C, D, 1, 5, 0xF61E2562 ); 
	P( D, A, B, C, 6, 9, 0xC040B340 ); 
	P( C, D, A, B, 11, 14, 0x265E5A51 ); 
	P( B, C, D, A, 0, 20, 0xE9B6C7AA ); 
	P( A, B, C, D, 5, 5, 0xD62F105D ); 
	P( D, A, B, C, 10, 9, 0x02441453 ); 
	P( C, D, A, B, 15, 14, 0xD8A1E681 ); 
	P( B, C, D, A, 4, 20, 0xE7D3FBC8 ); 
	P( A, B, C, D, 9, 5, 0x21E1CDE6 ); 
	P( D, A, B, C, 14, 9, 0xC33707D6 ); 
	P( C, D, A, B, 3, 14, 0xF4D50D87 ); 
	P( B, C, D, A, 8, 20, 0x455A14ED ); 
	P( A, B, C, D, 13, 5, 0xA9E3E905 ); 
	P( D, A, B, C, 2, 9, 0xFCEFA3F8 ); 
	P( C, D, A, B, 7, 14, 0x676F02D9 ); 
	P( B, C, D, A, 12, 20, 0x8D2A4C8A );
	
	#undef F#define F(x,y,z) (x ^ y ^ z) 
	
	P( A, B, C, D, 5, 4, 0xFFFA3942 ); 
	P( D, A, B, C, 8, 11, 0x8771F681 ); 
	P( C, D, A, B, 11, 16, 0x6D9D6122 ); 
	P( B, C, D, A, 14, 23, 0xFDE5380C ); 
	P( A, B, C, D, 1, 4, 0xA4BEEA44 ); 
	P( D, A, B, C, 4, 11, 0x4BDECFA9 ); 
	P( C, D, A, B, 7, 16, 0xF6BB4B60 ); 
	P( B, C, D, A, 10, 23, 0xBEBFBC70 ); 
	P( A, B, C, D, 13, 4, 0x289B7EC6 ); 
	P( D, A, B, C, 0, 11, 0xEAA127FA ); 
	P( C, D, A, B, 3, 16, 0xD4EF3085 ); 
	P( B, C, D, A, 6, 23, 0x04881D05 ); 
	P( A, B, C, D, 9, 4, 0xD9D4D039 ); 
	P( D, A, B, C, 12, 11, 0xE6DB99E5 ); 
	P( C, D, A, B, 15, 16, 0x1FA27CF8 ); 
	P( B, C, D, A, 2, 23, 0xC4AC5665 );
	
	#undef F#define F(x,y,z) (y ^ (x | ~z)) 
	P( A, B, C, D, 0, 6, 0xF4292244 ); 
	P( D, A, B, C, 7, 10, 0x432AFF97 ); 
	P( C, D, A, B, 14, 15, 0xAB9423A7 ); 
	P( B, C, D, A, 5, 21, 0xFC93A039 ); 
	P( A, B, C, D, 12, 6, 0x655B59C3 ); 
	P( D, A, B, C, 3, 10, 0x8F0CCC92 ); 
	P( C, D, A, B, 10, 15, 0xFFEFF47D ); 
	P( B, C, D, A, 1, 21, 0x85845DD1 ); 
	P( A, B, C, D, 8, 6, 0x6FA87E4F ); 
	P( D, A, B, C, 15, 10, 0xFE2CE6E0 ); 
	P( C, D, A, B, 6, 15, 0xA3014314 ); 
	P( B, C, D, A, 13, 21, 0x4E0811A1 ); 
	P( A, B, C, D, 4, 6, 0xF7537E82 ); 
	P( D, A, B, C, 11, 10, 0xBD3AF235 ); 
	P( C, D, A, B, 2, 15, 0x2AD7D2BB ); 
	P( B, C, D, A, 9, 21, 0xEB86D391 );
	
	#undef F ctx->state[0] += A;
	
	ctx->state[1] += B; 
	ctx->state[2] += C; 
	ctx->state[3] += D;
	
}

void md5_init(md5_context *ctx)
{ 
	memset( ctx, 0, sizeof(md5_context) );
}

void md5_starts( md5_context *ctx )
{ 
	ctx->total[0] = 0; 
	ctx->total[1] = 0; 
	ctx->state[0] = 0x67452301; 
	ctx->state[1] = 0xEFCDAB89; 
	ctx->state[2] = 0x98BADCFE; 
	ctx->state[3] = 0x10325476;
}

void md5_update( md5_context *ctx, const unsigned char *input, size_t ilen )
{ 
	size_t fill; 
	uint32_t left; 
	if( ilen == 0 ) 
		return; 
	left = ctx->total[0] & 0x3F; 
	fill = 64 - left; 
	ctx->total[0] += (uint32_t) ilen; 
	ctx->total[0] &= 0xFFFFFFFF; 
	if( ctx->total[0] < (uint32_t) ilen ) 
		ctx->total[1]++; 
	if( left && ilen >= fill ) 
	{ 
		memcpy( (void *) (ctx->buffer + left), input, fill ); 
		md5_process( ctx, ctx->buffer ); 
		input += fill; 
		ilen -= fill; 
		left = 0; 
	} 
	while( ilen >= 64 ) 
	{ 
		md5_process( ctx, input ); 
		input += 64; 
		ilen -= 64; 
	} 
	if( ilen > 0 ) 
	{ 
		memcpy( (void *) (ctx->buffer + left), input, ilen ); 
	}
}

void md5_finish( md5_context *ctx, unsigned char output[16] )
{ 
	uint32_t last, padn; 
	uint32_t high, low; 
	unsigned char msglen[8]; 
	high = ( ctx->total[0] >> 29 ) | ( ctx->total[1] << 3 ); 
	low = ( ctx->total[0] << 3 ); 
	PUT_UINT32_LE( low, msglen, 0 ); 
	PUT_UINT32_LE( high, msglen, 4 ); 
	last = ctx->total[0] & 0x3F; 
	padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last ); 
	md5_update( ctx, md5_padding, padn ); 
	md5_update( ctx, msglen, 8 ); 
	PUT_UINT32_LE( ctx->state[0], output, 0 ); 
	PUT_UINT32_LE( ctx->state[1], output, 4 ); 
	PUT_UINT32_LE( ctx->state[2], output, 8 ); 
	PUT_UINT32_LE( ctx->state[3], output, 12 );
}

void md5_free( md5_context *ctx )
{ 
	if( ctx == NULL ) 
		return; 
	zeroize( ctx, sizeof( md5_context ) );
}

void md5(const unsigned char *input, size_t ilen, unsigned char output[16] )
{ 
	md5_context ctx; md5_init( &ctx ); 
	md5_starts( &ctx ); 
	md5_update( &ctx, input, ilen ); 
	md5_finish( &ctx, output ); 
	md5_free( &ctx );
}