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fixed some inefficient code

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wangyu
2017-07-25 00:42:11 +08:00
committed by wangyu
parent 966ec3c925
commit aef193779b
2 changed files with 53 additions and 61 deletions
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26
encrypt.cpp
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@@ -20,10 +20,6 @@ static const int disable_aes=0;
int auth_mode=auth_md5;
int cipher_mode=cipher_aes128cbc;
//int auth(uint8_t *data,)
/*
int my_encrypt(uint8_t *data,uint8_t *output,int &len,uint8_t * key)
@@ -36,6 +32,27 @@ int my_decrypt(uint8_t *data,uint8_t *output,int &len,uint8_t * key)
return 0;
}
*/
unsigned int crc32h(unsigned char *message,int len) {
int i, crc;
unsigned int byte, c;
const unsigned int g0 = 0xEDB88320, g1 = g0>>1,
g2 = g0>>2, g3 = g0>>3, g4 = g0>>4, g5 = g0>>5,
g6 = (g0>>6)^g0, g7 = ((g0>>6)^g0)>>1;
i = 0;
crc = 0xFFFFFFFF;
while (i!=len) { // Get next byte.
byte = message[i];
crc = crc ^ byte;
c = ((crc<<31>>31) & g7) ^ ((crc<<30>>31) & g6) ^
((crc<<29>>31) & g5) ^ ((crc<<28>>31) & g4) ^
((crc<<27>>31) & g3) ^ ((crc<<26>>31) & g2) ^
((crc<<25>>31) & g1) ^ ((crc<<24>>31) & g0);
crc = ((unsigned)crc >> 8) ^ c;
i = i + 1;
}
return ~crc;
}
int auth_md5_cal(const char *data,char * output,int &len)
{
@@ -45,6 +62,7 @@ int auth_md5_cal(const char *data,char * output,int &len)
len+=16;
return 0;
}
int auth_none_cal(const char *data,char * output,int &len)
{
memcpy(output,data,len);