I am workiing on Sheriff Licence System Lately.In the staticlibrary there are a lot of usefull function.However I cant make use of it.
function name is
GetSecrets@@YAPAU_SLS_SECRET@@PBDAAH@Z

according to IDA it

want char,pointer to int and return value is pointer to SLS_SECRET structure.How can I link this function to my ap.I have Visual Studio 6.Thanks and sorry I am not familiar with VC and MFC

Looks like standard C++ name mangling to me, so if you extern a reference to the function name GetSecrets and use exactly the same return value and parameters, the compiler should generate the same name and be able to link to it.

Hi Laptinic,

If your project in C,

just make a prototype,

like this

SLS_SECRET * __cdecl GetSecrets(char, int *);

in linker put extra /defaultlib:<the_static_library.lib> switch to cmdline, if arguments you stated rite the importdef of ur app should be same as the exportdef.

I tried below

_SLS_SECRET * __cdecl GetSecrets(char const *,int &;

int test1;
GetSecrets("5328-8301-2929-7640-5794"",&test1);

or
SLS_SECRET * __cdecl GetSecrets(char, int *);
GetSecrets("5328-8301-2929-7640-5794"",&test1);

In the dissambly usage is like this

.data
sSize dd 0
pId db "5328-8301-2929-7640-5794"

push offset sSize
push offset pId
call GetSecrets

If you want I can upload my project or send to you.Thanks.

error message is
error C2664: GetSecrets' : cannot convert parameter 1 from 'char [25]' to 'char' This conversion requires a reinterpret_cast, a C-style cast or function-style cast

Finallly below one worked
_SLS_SECRET * __cdecl GetSecrets(char const *,int &;

typedef struct _SLS_SECRET
{
unsigned char Secret[32]; //null-terminate string
} SLS_SECRET;

char * pId="1234-5678-9012-3456-7890";

SLS_SECRET *mysecret;
strcpy(pId,"5328-8301-2929-7640-5794";
mysecret=GetSecrets(pId,sSize);

However I cant show mysecret with messagebox etc.

Have you tried searching for the SDK? It's bound to have been uploaded somewhere public, probably with weak password protection.

I have the sdk it is freely distributed from their website.I finally made it work but given serial number doesnt works.Anyway I guess I will find secret codes with my tool and uses slsgen.exe to make keys.

Thanks

You might want to learn programming C++ a bit better before diving into such as this.

I downloaded the sdk though and studied the static library as you said the function would be in.

The prototype of the function should be SLS_SECRET * GetSecrets(const char *, int *);

I don't think you want to use cdecl spec because that would conflict with C++ name mangling. Also the file you have your code in must be named *.cpp and not *.c to make sure you activate the C++ compiler.

From the prototype we see that parameter 1 is not modified by the function and should be zero terminated. For the second parameter you used reference instead of pointer but from the code I found:

.text:00000168 mov ecx, [ebp+arg_4]
.text:0000016B mov dword ptr [ecx], 4

So by using a pointer you make sure you get the correct code generated by the compiler.

So to call it you should do:

SLS_SECRET *pMysecret;
int nSize;
pMysecret = GetSecrets("5328-8301-2929-7640-5794", &nSize);

Now you state that you can't display the SLS_SECRET variable to a messagebox. Why doesn't that not surprise me?
What you really want is not to feed the messagebox with the SLS_SECRET structure but the char string inside it.

Try with something like:

MessageBox(NULL, pMysecret->Secret, "Secret data...!?", MB_OK);

// CyberHeg

I have already writen asm equivalent of GetSecret function and it works quite well.However licence generetion routine of sdk have a lot of C class function and it will took a lot of time to convert.So I thought if I can use GetSecretFunction from lib and with the help of SLS_GenerateLicenceKey function I may genereate licence key.However GenerateLicenceKey function gaves wrong serial number.Anyway if you want interested here is my code


Thanks everyone.