DetourIt

 SDK 

 

DecryptData
 
Converts a PCHAR string to a DATA_BLOB *
 
Syntax:
 
BOOL DecryptData(
   DATA_BLOB *DataIn,
   DATA_BLOB *DataOut
);
 
 
Parameters:
 
 
DataIn
            type: DATA_BLOB *
 
            A pointer to the DATA_BLOB to be decrypted.
 
 
Data Out
 
            Type: DATA_BLOB *
 
            A pointer to the decrypted data.
 
 
 
Return Value:
 
If the function succeeds, the function returns TRUE.
 
If the function fails, the function returns FALSE.
 
 
 
Example:
 
 
#include "detourit.h"
 
void main()
{
 
    //First of all we need a string to encrypt
    BYTE szTest[256] = "this string is for testing purposes";
 
    //DataIn is for the unencrypted string and DataOut for the encrypted data.
    DATA_BLOB DataIn = {0};
    DATA_BLOB DataOut = {0};
 
    //Convert the string to a pointer.
    BYTE *pbDataInput = (BYTE *)szTest;
 
    //Set pbData to the input string and specify how much memory it is using.
    DataIn.pbData = pbDataInput;
    DataIn.cbData = (DWORD) strlen((char *) pbDataInput) + 1;
 
    //This will encrypt DataIn using CryptProtectData and save the result in DataOut.
    //CryptProtectData encrypted data is only decryptable on the same computer as it was encrypted on.
    EncryptData(&DataIn, &DataOut);
 
    //Declaration of the recieving string.
    char *szOut = new char[(DataOut.cbData * 2) + 1];
 
    //Converts the content of DataOut to a string and saves it in szOut.
    BlobToStr(&DataOut, szOut);
 
    //Declaration of the DATA_BLOB structure that will recieve data from StrToBlob
    //and the soon to be decrypted 'DecryptedData'
    DATA_BLOB FromStrData = {0};
    DATA_BLOB DecryptedData = {0};
 
    //Converts szOut to a DATA_BLOB
    StrToBlob(szOut, &FromStrData);
 
    //Decrypt the contents of FromStrData
    DecryptData(&FromStrData, &DecryptedData);
 
    //original should contain "this string is for testing purposes"
    BYTE * original = DecryptedData.pbData;
 
    //Free the memory to prevent memory leaks.
    LocalFree(DataOut.pbData);
    LocalFree(DecryptedData.pbData);
    delete szOut;
}