Convert ASN1_OCTET_STRING contents to ASN1 Sequence

[Chang Lee]

Does anyone know of a way to take an ASN1_OCTET_STRING that contains a DER
encoded Sequence and extract the contents of the Sequence as an ASN1_STRING.
 Essentially, I want to construct an ASN1 object of the Sequence.  I guess I
could manually parse the Sequence (and deal with the different types of
length encoding) but I figure there must be an easier way.

Thanks,
CLee