Question

Here is the code which converts a hex string to byte array, it works fine but when the loop goes end and the complier reaches to the end of function it throws this error:
“Stack around the variable ‘uChar’ was corrupted”

void Cfsp::stringToHex(unsigned char hexArray[], LPCTSTR string)
{
    int stringLength=strlen(string);
    int j=0;
    unsigned char  uChar = 0;
    for (int x = 0; x < stringLength; x+=2)
    {
        sscanf_s(&string[x], "%02x", &uChar);
        hexArray[j] = uChar;
        j++;
    }
}

Here is where I initiate the array and call the function.

unsigned char Key[16];
stringToHex( Key,"2f145a8b11d33217");

I know when stringToHex would convert the given string (16 chars length) to byte array it only fills 8 Bytes(as char). I just wanted to make a reserved area in the buffer.

Answer 1

The reason you get corruption is because you send sscanf_s an unsigned char * where it expects int *