/// <summary>
///helper method that fills in a DATA_BLOB, copies
///data from managed to unmanaged memory
/// </summary>
/// <param name="blob"></param>
/// <param name="bits"></param>
private static void SetBlobData(ref Crypt32.DATA_BLOB blob, byte[] bits)
{
blob.cbData = bits.Length;
blob.pbData = Marshal.AllocHGlobal(bits.Length);
Marshal.Copy(bits, 0, blob.pbData, bits.Length);
}
/// <summary>
///helper method that gets data from a DATA_BLOB,
///copies data from unmanaged memory to managed
/// </summary>
/// <param name="blob"></param>
/// <returns></returns>
private static byte[] GetBlobData(ref Crypt32.DATA_BLOB blob)
{
// return an empty string if the blob is empty
if (blob.pbData.ToInt32() == 0)
return null;
// copy information from the blob
byte[] data = new byte[blob.cbData];
Marshal.Copy(blob.pbData, data, 0, blob.cbData);
Kernel32.LocalFree(blob.pbData);
return data;
}