TDS协议 加密密码算法

看freetds的源码：

unsigned char *
tds7_crypt_pass(const unsigned char *clear_pass, int len, unsigned char *crypt_pass)
{
 int i;

 for (i = 0; i < len; i++)
  crypt_pass[i] = ((clear_pass[i] << 4) | (clear_pass[i] >> 4)) ^ 0xA5;
 return crypt_pass;
}

 

调用：tds7_crypt_pass((unsigned char *) unicode_string, password_len, (unsigned char *) unicode_string); 

这一点，wireshark早已经解析出来了。只是，当时不知道用哪种算法实现。

 

附调试代码：

#include
#include "stdlib.h"
#include
unsigned char *tds7_crypt_pass(const unsigned char *clear_pass, int len, unsigned char *crypt_pass)
{
 int i;
 
 for (i = 0;i < len; i++)
  crypt_pass[i] = ((clear_pass[i] << 4) | (clear_pass[i] >> 4)) ^ 0xA5;
 return crypt_pass;
}
int main()
{
 const unsigned char password[]="abc123";
 unsigned char buf[30];
 unsigned char *encrpted_pass=buf;
 int i;
 memset(encrpted_pass,0,sizeof(buf));
 tds7_crypt_pass(password,sizeof(password)-1,encrpted_pass);
 for(i=0;i {
  printf("%c     ",password[i]);
  printf("%x/n",encrpted_pass[i]);
 }
 return 0;
}