BSTR Conversion

[Digifox]

I am new to this environment!
But if I am in the write area to begin with!
In my atl dll I am creating a functions that pass information back and forth
to access, vb and csharp.
I am trying to iterate thru the string put here, newVal.
I want to loop thru a variable length string and rebuild
an encrypted string that gets passed back to newVal.

Maybe a for or loop statement around newVal.
I would like to rebuild the string(newVal)
character by character to a new string!
Put the value back in newVal.

It's very possible that the method below should have a return string!
I am using BSTR because I am told it works best on var len str and vba?

Your help is greatly appreciated!
John

STDMETHODIMP Cwmlclass::put_Encrypt(BSTR newVal)
{
//poor code below!
newVal = _bstr_t("test");
//myEncryptPwd is my return string
myEncryptPwd = newVal;
return S_OK;
}