单片机中常用的轻量级校验算法

校验和

uint8_t CheckSum(uint8_t *Buf, uint8_t Len){  uint8_t i = 0;  uint8_t sum = 0;  uint8_t checksum = 0;
  for(i=0; i<Len; i++)  {    sum += *Buf++;  }
  checksum = sum  0xff;
  return checksum;}

异或校验

uint8_t CheckXOR(uint8_t *Buf, uint8_t Len){  uint8_t i = 0;  uint8_t x = 0;
  for(i=0; i<Len; i++)  {    x = x^(*(Buf+i));  }
  return x;}

CRC校验

uint8_t CRCTAB_H[256] = {/*表省略*/};uint8_t CRCTAB_L[256] = {/*表省略*/};void CRC16(uint8_t *pData, uint8_t Len, uint8_t *CRC_H, uint8_t *CRC_L){  uint8_t  i;  uint8_t  index;  uint8_t  crc_h = 0xFF;  uint8_t  crc_l = 0xFF;
  for(i=0; i<Len; i++)  {    index = crc_h^*(pData + i);    crc_h = crc_l^CRCTAB_H[index];    crc_l = CRCTAB_L[index];  }
  *CRC_H = crc_h;  *CRC_L = crc_l;}

MD5算法

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