add some change in this code - input from a file and output to another file

[jacob73]

hi
i have this code(gtalk pw decoder):

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <wincrypt.h>

#define SEED_CONSTANT 0xba0da71d

unsigned char secretKey[16]={ 0xa3,0x1e,0xf3,0x69,
                              0x07,0x62,0xd9,0x1f,
                              0x1e,0xe9,0x35,0x7d,
                              0x4f,0xd2,0x7d,0x48 };

int Decode(char output[], char passEntry[], DWORD entryLen)
{
    int ret = -1;
    HANDLE hToken;
    char sid[512], name[512],domain[512];
    DWORD SidSize = 0, i, j;
    DWORD cchName,cchDomain;
    SID_NAME_USE peUse;
    TOKEN_USER *SidUser = (TOKEN_USER*)&sid;

    unsigned char staticKey[16];
    unsigned int seed;
    unsigned char *a,*b;

    memcpy(staticKey,secretKey,sizeof(staticKey));

    if((OpenProcessToken(GetCurrentProcess(),TOKEN_QUERY,&hToken)))
    {
        if((GetTokenInformation(hToken,TokenUser,SidUser,sizeof(sid),&SidSize)))
        {
            cchName = cchDomain = sizeof(name);

            if((LookupAccountSid(NULL,SidUser->User.Sid,
                    name,&cchName,domain,&cchDomain,&peUse)))
            {
                seed = SEED_CONSTANT;

                // mix username with key

                for(i = 0;i < cchName;i++)
                {
                    ((unsigned int*)staticKey)[ i % 4 ] ^= name[i] * seed;
                    seed *= 48271;
                }

                // mix domain name with key

                for(j = 0;j < cchDomain;i++,j++)
                {
                    ((unsigned int*)staticKey)[ i % 4 ] ^= domain[j] * seed;
                    seed *= 48271;
                }

                // decode  string

                seed = (((unsigned int*)staticKey)[0] | 1);
                a = (unsigned char*)&passEntry[4];
                b = (unsigned char*)&passEntry[5];

                for(i = 0;i < entryLen;i += 2)
                {
                    passEntry[ i / 2 ] = (((a[i]-1)*16) | (b[i]-33)) - (seed & 0xff);
                    seed *= 69621;
                }

                // use protected storage to decrypt data

                DATA_BLOB   DataIn, DataEntropy, DataOut;

                DataEntropy.cbData = sizeof(staticKey);
                DataEntropy.pbData = (BYTE*)&staticKey;

                DataIn.cbData = (i/2);
                DataIn.pbData = (BYTE*)passEntry;

                //passEntry[(i/2)+4]=0;

                if(CryptUnprotectData(&DataIn,
                                   NULL,
                                   &DataEntropy,
                                   NULL,
                                   NULL,
                                   1,
                                   &DataOut)) {
                    memcpy(output,DataOut.pbData,DataOut.cbData);
                    output[DataOut.cbData] = 0;
                    LocalFree(DataOut.pbData);
                    ret = 0;
                }
            }
        }
        CloseHandle(hToken);
    }
    return(ret);
}

int main(void) {
    char    pwd[1024],
            out[1024],
            *p;

    printf(
        "paste your encrypted password here\n"
        "(\"pw\" from HKEY_CURRENT_USER\\Software\\Google\\Google Talk\\Accounts):\n");
    fgets(pwd, sizeof(pwd), stdin);
    for(p = pwd; *p && (*p != '\n') && (*p != '\r'); p++);
    *p = 0;

    if(!Decode(out, pwd, strlen(pwd))) {
        printf("\nPASSWORD: %s\n", out);
    } else {
        printf("\nthe password cannot be decrypted on this account/machine\n");
    }
    printf("\npress return to quit\n");
    fgetc(stdin);
    return(0);
}

when i run this code i get this error:

Error 1 error C2664: 'LookupAccountSidW' : cannot convert parameter 3 from 'char [512]' to 'LPWSTR'

how can i fix it?
and one more question, how can i get pw directly from a text file and write decrypted password on another text file?

[Caligulaminus]

If you turn off unicode in the project options you should be fine...
The problem is that LookupAccountSid is mapped to LookupAccountSidW which asks for wide character (unicode) strings, but name is a char[] not wchar_t[].

[webJose]

Read my answer here: http://www.cplusplus.com/forum/general/56526/ .

Then make the changes in your code to either TCHAR or function names to -A.

[jacob73]

oh! thanks! it works now!
so, now i need to remove last part of code and set a text file for input and another text file for output, sorry guys, i'm beginner, help me please

[webJose]

Since I am unaware of the encryption method used here, I'll just point out that you can use file streams to read and write to files, or since you are working in Windows, you could use the Windows API directly. Open and create files using CreateFile(), read them using ReadFile() and write to them using WriteFile().

This website's tutorial will teach you how to use file streams if you choose this path.

[jacob73]

thanks, can u give me a sample?
i can't understand c++ codes! i work with vb, and i want to give encrypted password from registry and save it on a text file with vb,for example text1.txt , and run this code, this code directly read text1.txt and decrypt password and write it on text2.txt, and i get decrypted password from text2 again, sorry for my eng

[webJose]

If you don't understand C++, why are you trying to program in it??? All that can be done in classic VB or VB.net.

[jacob73]

i need that, really?!?!! all of the decryption code??? i just find this code for decrypt password, and i cannot translate it to vb

[webJose]

Yes, you can call the Windows API functions from either classic VB or VB.net, and the language can certainly do the rest. Will it be simpler? Hmmm..... I am guessing No, but that's answer for me that knows C++. For you that don't know C++, I guess it could be a Yes because you don't have to learn C++ AND do this stuff.

C++ is no walk in the park. Unlike VB or VB.net, you don't get memory automatically allocated or deallocated. You have to do all that. And on top of that, you must control what memory goes "outside" the C++ realm in Platform Invoke calls in order to appropriately marshal calls to the Windows API or to API's written in third party DLL's.

So the way I see it: You have 2 choices. The first one is to learn C++ and continue down this path, or to learn how to do this entirely in VB or VB.net.

[jacob73]

and there is another way too! i change last part of this code (but i don't know how!!) and do other works in vb! can u help me to do that? i just need to change that part which request pw

and one point! second choice need first choice!!

[jacob73]

yohoooooooooo!! i did it! thanks guys!