Cryptunprotectdata returning the unencrypted string.

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C++

I have been trying to decrypt a string that has been encrypted (DPAPI) with c++ for a while now, but I cant seem to figure it out. Right now when I try to decrypt a string with the CryptUnprotectData function, I only get back the unencrypted string that I put into the function. Here is my code:

<pre>#include <stdio.h>
#include <windows.h>
#include <Wincrypt.h>
#include <string>
#include <vector>
#include <fstream>
#include <iostream>
using namespace std;

#define MY_ENCODING_TYPE  (PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)

#pragma comment (lib, "Crypt32.lib")

int main()
{

    string data = ("data I want to decode \n");
    cout << data;

    LPWSTR pDescrOut = NULL;


    DATA_BLOB DataBytes;
    BYTE* pbDataOutput = (BYTE*)data.data();
    DWORD cbDataOutput = strlen((char*)pbDataOutput) + 1;
    DataBytes.pbData = pbDataOutput;
    DataBytes.cbData = cbDataOutput;

    HRESULT res = CryptUnprotectData(
        &DataBytes,
        NULL,
        NULL,                 // Optional entropy
        NULL,                 // Reserved
        NULL,                 // Here, the optional
        // prompt structure is not
        // used.
        0,
        &DataBytes);

        printf("The decrypted data is: %s\n", DataBytes.pbData);



    LocalFree(pDescrOut);

}

Any help would be appreciated.

What I have tried:

I have tried whittling down some code from the documentation of the function here but only for it to stop working when i remove the encryption function.