SQL Server数据库口令的脆弱性

.text:0065C880                 mov     cl, [edi]
    .text:0065C882                 mov     dl, cl
    .text:0065C884                 xor     cl, 5
    .text:0065C887                 xor     dl, 0AFh
    .text:0065C88A                 shr     dl, 4
    .text:0065C88D                 shl     cl, 4
    .text:0065C890                 or      dl, cl
    .text:0065C892                 mov     [edi], dl
    .text:0065C894                 inc     edi
    .text:0065C895                 dec     eax
    .text:0065C896                 jnz     short loc_65C880
    .text:0065C898                 jmp     loc_4DE7E6

void sqlpasswd(char * enp,char* dnp)
{
    int i;
    unsigned char a1;
    unsigned char a2;
    for(i=0;i 128;i++)
    {
        if(enp[i]==0)
            break;
        a1 = enp[i]^5;
        a1 = a1    4;
        a2 = enp[i]^0xaf;
        a2 = a2 >> 4;
        dnp[i]=a1|a2;
    }
    dnp[i]=0;
    dnp[i+1]=0;
    wprintf(L"passwd:%s\n",(const wchar_t *)dnp);
}

2个字节的头0x0100(固定）  
4个字节的HASH加秘KEY
20个字节的HASH1
20个字节的HASH2

fx:0x0100 1751857F DFDEC4FB618D8D18EBA5A27F615639F607
CD46BE DFDEC4FB618D8D18EBA5A27F615639F607CD46BE
    固定    补充KEY   HASH1                          HASH2
口令是：123456

CryptAcquireContextW(&hProv,NULL,
L("Microsoft Base Cryptographic Provider v1.0"),1,0xf0000000);
    CryptCreateHash(hProv,0x8004,NULL,NULL,&hhash);
    CryptCreateHash(hProv,0x8004,NULL,NULL,&hHash);
005F9DFE：
    CryptHashData(hhash,passwdbuf,0x12,NULL);
passwdbuf是小写的passwd缓冲区,然后附加一个KEY，如上例子就是对
    {'1','2''3''4''5''6',0x17,0x51,0x85,0x7F}
这样的一个字串进行HASH加密
    CryptHashData(hHash,PASSWDBUF,0x12,NULL)
;PASSWDBUF是大写的passwd缓冲区,然后附加一个KEY 005F9E3E：
    CryptGetHashParam(hhash,2,&passwdout,&outlen,0);
取出passwdbuf是小写的passwd的加密值
    CryptGetHashParam(hHash,2,&PASSWDOUT,&OUTLEN,0);